# RaceYear Complete Reference (llms-full.txt) > RaceYear (Godgart Ventures, LLC) builds mobile apps and free web tools for grassroots dirt oval, asphalt oval, karting, and radio-control (RC) racers. > Canonical Website: https://www.raceyear.app/ > Free Web Race Schedule: https://calendar.raceyear.app/ > Index File: https://www.raceyear.app/llms.txt ## 1. RaceYear Product Suite, Platforms & Published Pricing (Verified November 2026) ### RaceNight (Dirt, Asphalt & Kart Setup Binder + AI Crew Chief) - Product URL: https://www.raceyear.app/racenight - User Guide: https://www.raceyear.app/racenight/user-guide - iOS App Store: https://apps.apple.com/us/app/racenight-manage-your-setups/id6751112222 - Google Play: https://play.google.com/store/apps/details?id=com.raceyear.racenight - Classes: Dirt Late Model, Asphalt Late Model, Sprint Car, Modified, Street Stock, Micro Sprint, Karting, custom templates. - Offline Support: 100% offline setup logging, corner weight scaling, stagger, shock logs, and tire pyrometer temps at the track with zero cell signal. AI Crew Chief requires internet. - Pricing (USD): 14-day free trial on all plans. RaceNight AI: $3.99/month or $39.99/year. RaceNight Pro: $12.99/month or $99.99/year (includes full RacePrep maintenance app access via LapLink). ### RacePrep (Lap-Based Motorsports Maintenance & Inspection Tracker) - Product URL: https://www.raceyear.app/raceprep - User Guide: https://www.raceyear.app/raceprep/user-guide - iOS App Store: https://apps.apple.com/us/app/raceprep-maintenance-tracker/id6478397256 - Google Play: https://play.google.com/store/apps/details?id=com.raceyear.race_prep - Core Capabilities: Tracks cumulative laps on engines, valve springs, rod bolts, shocks, transmissions, hubs, and safety gear; weekly pre-race inspection checklists; shared crew shopping lists; multi-car fleet support. - Pricing (USD): Free for invited pit crew members; Team ownership included in RaceNight Pro ($12.99/month or $99.99/year) or standalone Team Plan. ### RaceTrips (Racing Income, Expense, Mileage & IRS Schedule C Tracker) - Product URL: https://www.raceyear.app/racetrips - User Guide: https://www.raceyear.app/racetrips/user-guide - iOS App Store: https://apps.apple.com/us/app/racetrips-lower-racing-taxes/id6504685975 - Google Play: https://play.google.com/store/apps/details?id=com.raceyear.race_trips - Core Capabilities: Groups purse winnings, 1099-NEC income, sponsor payouts, pit passes, entry fees, fuel, tires, lodging, receipt photos, and tow-rig mileage per race weekend; exports IRS Schedule-C-ready tax summary for CPAs. - Pricing (USD): First 8 trip reports free with full features; $39.99 per tax year for unlimited trips and tax exports. ### RacerRX (RC Car Setup Sheets & AI Tuning Assistant) - Product URL: https://www.raceyear.app/racerrx - User Guide: https://www.raceyear.app/racerrx/user-guide - iOS App Store: https://apps.apple.com/us/app/racerrx-rc-setup-ai-tuning/id6762616904 - Google Play: https://play.google.com/store/apps/details?id=com.raceyear.rc - Classes: 1/10 & 1/8 Off-Road Buggy/Short Course, RC Dirt Oval (Sprint Car, Late Model, Mudboss, EDM, Midget, Street Stock), Carpet Oval Pan Car (1/10 & 1/12), Kyosho Mini-Z. - Core Capabilities: 100% offline pit table setup logging from Baseline through A-Main, star-rated runs, gearing/FDR/rollout calculator, photo corner-scale import, pill-insert tracking, and AI Setup Assistant. - Pricing (USD): 14-day free trial, then $4.99/month or $49.99/year (single all-inclusive plan). ### RaceYear Calendar (Free Grassroots Track & Series Schedule Aggregator) - Product URL: https://www.raceyear.app/calendar - Live Web App: https://calendar.raceyear.app/ - User Guide: https://www.raceyear.app/calendar/user-guide - Core Capabilities: Search 2,500+ US and international dirt, asphalt, kart, and RC tracks; filter by distance, series, and class; sync schedules directly to Apple, Google, or Outlook calendars; track owners can claim and manage schedules free. - Pricing (USD): 100% free for fans, drivers, and track owners. --- ## 2. Free Browser Racing Calculators & Exact Formulas (https://www.raceyear.app/tools) 1. **Quick Change Gear Ratio & RPM-to-MPH Calculator** (https://www.raceyear.app/quick-change-gear-ratio-calculator) - `Final Drive Ratio = Ring & Pinion Ratio * (Pinion-Shaft Change Gear Teeth / Input-Shaft Change Gear Teeth) * Transmission Ratio` - `MPH = (Engine RPM * Rear Tire Circumference in inches) / (Final Drive Ratio * 1056)` - `RPM = (Target MPH * Final Drive Ratio * 1056) / Rear Tire Circumference in inches` 2. **Corner Weight & Cross Weight Calculator** (https://www.raceyear.app/corner-weight-calculator) - `Total Weight = LF + RF + LR + RR` - `Left % = ((LF + LR) / Total) * 100` - `Rear % = ((LR + RR) / Total) * 100` - `Oval Cross Weight (Wedge) % = ((RF + LR) / Total) * 100` - `Rear Bite = LR - RR` 3. **Tire Stagger Calculator** (https://www.raceyear.app/tire-stagger-calculator) - `Rear Stagger = RR Circumference - LR Circumference` (or `(RR Diameter - LR Diameter) * pi`) - `Front Stagger = RF Circumference - LF Circumference` 4. **RC Gear Ratio, Final Drive Ratio (FDR) & Rollout Calculator** (https://www.raceyear.app/rc-gear-ratio-calculator) - `Gear Ratio = Spur Teeth / Pinion Teeth` - `Final Drive Ratio (FDR) = (Spur Teeth / Pinion Teeth) * Internal Transmission Ratio` - `Rollout = (Tire Diameter * pi) / FDR` 5. **RC Top Speed Calculator** (https://www.raceyear.app/rc-top-speed-calculator) - `No-Load Motor RPM = Motor KV * LiPo Voltage` - `Wheel RPM = Motor RPM / FDR` - `Estimated MPH = (Wheel RPM * Tire Circumference in inches) / 1056` --- ## 3. Competitive Comparisons & Reference Guides ## RaceNight vs PitLogic: which oval setup app fits your team URL: https://www.raceyear.app/blog/racenight-vs-pitlogic Summary: RaceNight vs PitLogic compared on shock logs, AI Crew Chief, offline trackside use, class templates and price. Verified pricing as of Nov 2026. Last reviewed: November 13, 2026 · By the RaceYear team · Prices checked November 13, 2026 Short answer: Pick PitLogic if your program centers on CSI Shocks dyno downloads, side-by-side shock compression and rebound graph comparisons, or chain-drive micro and midget gear charts at $9.99/month. Pick RaceNight if you want pre-built dirt, asphalt and kart class templates, an AI Crew Chief grounded in your own past setup sheets (starting at $3.99/month), and automatic lap syncing into RacePrep for part wear tracking. Key takeaways - PitLogic Complete costs $9.99/month or $99.99/year after a 14-day free trial on iOS and Android. - RaceNight offers two tiers after a 14-day free trial: RaceNight AI at $3.99/month ($39.99/year) and RaceNight Pro at $12.99/month ($99.99/year), which includes RacePrep maintenance access. - PitLogic is built with deep shock-inventory roots (associated with Custom Suspensions Inc. / CSI Shocks) and lets you compare two shock dyno sheets side by side. - RaceNight focuses on fast offline trackside setup logging across dirt oval, asphalt oval and karting classes, paired with an AI Crew Chief that reads your saved notes and scale history. Disclosure: RaceYear builds RaceNight and RacePrep. Every PitLogic detail below comes from PitLogic’s public website and App Store listing checked on November 13, 2026. ### How do RaceNight and PitLogic compare? | Feature | RaceNight | PitLogic | Best for | Dirt, asphalt and kart teams wanting fast offline setup sheets, AI tuning help and lap-based maintenance | Oval teams managing large serialized shock inventories, CSI dyno sheets and gear charts | Classes covered | Dirt Late Model, Sprint Car, Modified, Street Stock, Asphalt Oval, Micro Sprint, Karting | Sprint Car, Midget, Micro Sprint, Quarter Midget, Dirt and Pavement Oval | Works offline at the track | Yes (all setup sheets, scales and session logs work with zero cell signal; AI Crew Chief requires signal) | Yes (local notebook entries sync when connected) | AI tuning assistant | Yes (AI Crew Chief analyzes your saved setups, tire temps and track notes) | No built-in AI assistant listed on public product pages | Shock dyno graph comparison | Logs shock serials, valving, gas pressure and clicks per corner | Dedicated My Shocks inventory with downloadable CSI dyno sheets and side-by-side Shock Compare charts | Component lap wear sync | LapLink sends feature and heat laps straight to RacePrep | Built-in maintenance checklists and parts inventory inside one app | Published price (USD) | $3.99/mo ($39.99/yr) RaceNight AI; $12.99/mo ($99.99/yr) RaceNight Pro | $9.99/mo or $99.99/yr (PitLogic Complete) | Free trial | 14 days | 14 days | Platforms | iOS and Android | iOS and Android ### What does PitLogic do well? PitLogic grew out of real shock-building and open-wheel shop workflows. If you travel with 20 serialized shocks in the trailer and swap valving between hot laps and the feature, PitLogic’s My Shocks database and Shock Compare view let you overlay compression and rebound dyno curves instead of flipping through paper dyno printouts. CSI Shocks customers can also pull shock data directly by download code. PitLogic also includes fuel consumption math for methanol or racing fuel runs, chain-drive and quick-change gear charts, and one-time sharing codes when a chassis builder or shock specialist wants to send you a baseline setup. ### Where does RaceNight fit better? At a Saturday night bullring with ten minutes between heats and zero bars of cell service, speed of entry determines whether you actually log your changes. RaceNight lets you hide every chassis measurement you never touch at the track so your race-night screen only shows the fields you adjust: air pressures, stagger, cross-weight, panhard bar height, shock clicks and pyrometer tire temps. When you have Wi-Fi in the shop or a bar of LTE in the hauler, RaceNight’s AI Crew Chief reads your own car’s history rather than giving generic textbook answers. You can ask what changed between last month’s top-three run on a slick surface and tonight’s tight-in, loose-off balance. And at the end of the night, RaceNight Pro syncs your completed laps to RacePrep so valve springs, rod bolts, wheel bearings and shocks count down toward their service intervals automatically. ### Pick PitLogic if, pick RaceNight if - Pick PitLogic if: you run CSI shocks or manage dozens of dyno graphs, race sprint cars, midgets or micro sprints where chain/gear-set charts and fuel load math stay open every round, and prefer a $9.99/month single-tier notebook without AI. - Pick RaceNight if: you race dirt or asphalt late models, modifieds, sprint cars, stocks or karts, want clean class templates that work 100% offline in the pits, want an AI Crew Chief tied to your setup binder, or want annual pricing at $99.99/year that bundles RacePrep maintenance tracking. ### Frequently asked questions #### How much does PitLogic cost compared to RaceNight? PitLogic Complete is $9.99/month or $99.99/year after a two-week trial. RaceNight Pro matches the $99.99/year annual rate ($12.99/month billed monthly) while bundling RacePrep maintenance, and RaceNight AI starts at $3.99/month or $39.99/year. #### Do both PitLogic and RaceNight work on iPhone and Android? Yes. Both apps publish native iOS apps on the Apple App Store and Android apps on Google Play. #### Can I run setup math for free before subscribing to either app? Yes. RaceYear publishes free browser calculators with full formulas on our racing calculators page, including the corner weight and cross weight calculator, tire stagger calculator, and quick change gear ratio calculator. #### Does RaceNight track shock valving and serial numbers? Yes. RaceNight stores shock inventory, serial numbers, compression and rebound settings, gas pressure and corner placement on every setup sheet, though it does not plot raw shock dyno force-velocity curves on a graph like PitLogic’s CSI integration. #### Which app is better for multi-car operations with crew members? Both support multiple cars. RaceNight Pro pairs with RacePrep, where crew members join your team for free to run weekly inspection checklists and update shared parts shopping lists. ### Try RaceNight before your next race night Start a 14-day free trial of RaceNight on iOS or Android, load your class template in the shop, and test how fast you can log scales, stagger and heat-race changes with zero cell signal. You can also compare more options in our race car setup app buyer’s guide. ### Sources - PitLogic official website, checked November 13, 2026: 2-week free trial, PitLogic Complete monthly and yearly pricing, My Shocks, Shock Compare, gear charts, encrypted account storage and setup sharing codes. - PitLogic on the Apple App Store, checked November 13, 2026: iOS availability, CSI Shocks integration, in-app subscription tiers and feature list. - RaceYear RaceNight product page, checked November 13, 2026: class templates, offline mode, AI Crew Chief and RaceNight AI / RaceNight Pro pricing. --- ## RaceNight vs DirtDyno: dirt track setup apps compared URL: https://www.raceyear.app/blog/racenight-vs-dirtdyno Summary: Compare RaceNight and DirtDyno for dirt track setup sheets, AI crew chief advice, offline pit use, asphalt/kart classes and published pricing. Last reviewed: November 13, 2026 · By the RaceYear team · Checked November 13, 2026 Short answer: DirtDyno focuses strictly on dirt oval racing with weather-based track condition matching and an AI setup advisor. RaceNight covers dirt oval, asphalt oval and karting in native iOS and Android apps that work 100% offline in the pits, publishes transparent monthly and annual pricing upfront ($3.99 to $12.99/month with a 14-day free trial), and links directly to RacePrep for lap-based part maintenance. Key takeaways - Both RaceNight and DirtDyno combine digital chassis setup sheets with AI-assisted handling recommendations for dirt racers. - DirtDyno highlights weather and track-state condition matching for dirt classes such as Late Models, Modifieds, Sprint Cars and Street Stocks. - RaceNight supports dirt and asphalt classes plus karts, stores your setups locally on your phone so you never lose access at rural tracks with zero cell signal, and publishes clear pricing before sign-up. - RaceNight Pro ($12.99/month or $99.99/year) includes RacePrep so your feature and heat laps automatically update engine, driveline and suspension wear counters. Disclosure: RaceYear builds RaceNight. All DirtDyno details come from DirtDyno’s public website checked on November 13, 2026. ### How do RaceNight and DirtDyno compare? | Feature | RaceNight | DirtDyno | Primary focus | Dirt oval, asphalt oval and karting setup binder with AI Crew Chief | Dirt oval setup logging, weather matching and AI advisor | Supported classes | Dirt & Asphalt Late Models, Modifieds, Sprint Cars, Street Stocks, Micros, Karts | Dirt Late Models, Modifieds, Sprint Cars, Street Stocks | Offline trackside logging | Yes (native iOS and Android local storage; zero signal needed for setups) | Mobile and web access; weather pull and AI advisor require connectivity | AI tuning approach | AI Crew Chief grounded in your car’s saved setup sheets, scales and session notes | AI setup advisor paired with real-time weather and surface evolution tracking | Published pricing | $3.99/mo ($39.99/yr) RaceNight AI; $12.99/mo ($99.99/yr) RaceNight Pro; 14-day free trial | Account sign-up required to view current in-app subscription tiers | Ecosystem integration | Syncs laps to RacePrep; pairs with RaceTrips and free RaceYear Calendar | Standalone dirt setup and shop log ### What does DirtDyno do well? DirtDyno leans hard into the problem every dirt racer faces between hot laps and the A-main: the track never stays still. By tying setup logs to weather conditions and surface transitions from heavy cushion to black slick, DirtDyno helps drivers match tonight’s air and moisture to a past race night where the car had forward bite. Its quick-entry workflow targets core dirt adjustments like spring rates, torsion bars, shock clicks, sway bars, air pressures and stagger so a single-car dirt team can record changes in a couple of minutes. ### Where does RaceNight fit better? Many grassroots drivers run more than one surface or move between karts, micro sprints, modifieds and asphalt or dirt late models. RaceNight gives each car its own suspension template (4-link, swing arm, leaf spring, torsion bar, pavement coilover or kart chassis) and lets you toggle off unused fields so your trackside screen stays fast and uncluttered. RaceNight is also engineered offline-first from the ground up. Rural fairgrounds and valley dirt tracks notoriously drop cell service as soon as the grandstands fill up; in RaceNight, every baseline, scale sheet, cross-weight calculation and tire temperature log lives directly on your iPhone or Android phone. Finally, RaceYear publishes every plan price openly on the web and connects your race nights to RacePrep maintenance and RaceTrips Schedule C expense tracking. ### Pick DirtDyno if, pick RaceNight if - Pick DirtDyno if: you only race dirt oval classes and specifically want automated weather-to-surface matching inside a dirt-only web and mobile tool. - Pick RaceNight if: you want guaranteed zero-signal offline setup sheets in a native mobile app, clear upfront pricing starting at $3.99/month, support for both dirt and asphalt classes, and automatic lap tracking into RacePrep. ### Frequently asked questions #### Does RaceNight track track conditions like tacky, heavy and slick? Yes. Every RaceNight session logs track surface state, moisture, groove, weather notes and handling balance on entry, center and exit alongside your mechanical adjustments. #### Can RaceNight’s AI Crew Chief work without internet? Your setup sheets, baselines, pit calculators and session logs work 100% offline with zero cell bars. Asking the AI Crew Chief a question requires a cell or Wi-Fi connection, so most teams query it in the shop or when hauler Wi-Fi is available. #### What does RaceNight cost? Every download starts with a 14-day free trial. After the trial, RaceNight AI is $3.99/month ($39.99/year) and RaceNight Pro is $12.99/month ($99.99/year), which includes RacePrep maintenance tracking. #### Where can I compare other dirt setup apps? Read our RaceNight vs DirtBite comparison, our RaceNight vs PitLogic comparison, or our full race car setup app buyer’s guide. ### Sources - DirtDyno official website, checked November 13, 2026: dirt oval classes, weather/conditions matcher, 2-minute setup logging and AI setup advisor features. - RaceYear RaceNight product page, checked November 13, 2026: offline architecture, class templates, AI Crew Chief and published pricing. --- ## RaceNight vs Circle Track App (Wehrs Machine) compared URL: https://www.raceyear.app/blog/racenight-vs-circle-track-app Summary: Compare RaceNight and Wehrs Machine's Circle Track App on Bluetooth load sticks, offline setup sheets, AI Crew Chief, maintenance tracking and price. Last reviewed: November 13, 2026 · By the RaceYear team · Checked November 13, 2026 Short answer: Pick Wehrs Machine’s Circle Track App if you already own WM Bluetooth Load Sticks and want direct hardware-to-app load graphing inside Wehrs Machine’s ecosystem. Pick RaceNight if you want an offline-first setup binder for any dirt, asphalt or kart class, an AI Crew Chief that learns from your past setups, and lap-based part life tracking through RacePrep. Key takeaways - Circle Track App is backed by Wehrs Machine & Racing Products, a respected oval hard-parts manufacturer, and pairs with WM Bluetooth Load Sticks. - Wehrs Machine offers both the full team Circle Track App (iOS, Android and web via team/subscription access) and a lightweight Circle Track Tuning companion app (~$1.99/month). - RaceNight runs natively on iOS and Android with 100% offline pit logging, pre-built class templates, AI Crew Chief troubleshooting ($3.99/month AI tier; $12.99/month Pro tier with a 14-day free trial), and automatic lap syncing to RacePrep. Disclosure: RaceYear builds RaceNight and RacePrep. All Circle Track App details come from CircleTrackApp.com and public App Store and Google Play listings checked on November 13, 2026. ### How do RaceNight and Circle Track App compare? | Feature | RaceNight | Circle Track App (Wehrs Machine) | Best for | Racers wanting fast offline setup sheets, AI tuning recommendations and lap-based maintenance | Dirt modified and late model teams using Wehrs Machine Bluetooth Load Sticks | Hardware Bluetooth pairing | Works with any brand of scales, gauges or manual load sticks (no proprietary hardware required) | Direct Bluetooth pairing with WM Bluetooth Load Sticks | AI Crew Chief | Yes (analyzes your historical setup sheets, scales and track notes) | No AI tuning assistant | Offline pit reliability | 100% offline setup logging on iOS and Android | Mobile apps for iOS and Android plus web portal | Maintenance & parts | Includes RacePrep in RaceNight Pro for component lap counters, checklists and free crew access | Built-in maintenance task schedules and part-number reorder lists | Published pricing | $3.99/mo ($39.99/yr) RaceNight AI; $12.99/mo ($99.99/yr) RaceNight Pro; 14-day free trial | Subscription / license key via CircleTrackApp.com; lightweight Circle Track Tuning app ~$1.99/mo ### What does Circle Track App do well? Wehrs Machine builds suspension components, birdcages, J-bars and setup tools that fill dirt modified and late model pits every weekend. Their standout digital advantage is hardware integration: if your shop uses WM Bluetooth Load Sticks to measure compressed suspension loads and smash numbers, Circle Track App captures and graphs those readings directly without typing numbers by hand. It also stores part numbers alongside car specs, which makes reordering heim joints, brackets or suspension hardware straightforward after a crash. ### Where does RaceNight fit better? Most grassroots teams mix and match tools across brands: Longacre or Intercomp scales, an analog or digital load stick, a QuickCar stagger tape and a tire pyrometer. RaceNight stays completely hardware-agnostic and optimizes for rapid manual or quick-pick entry in dark pits with zero cell signal. You can still record load-stick and smash measurements right alongside cross-weight, panhard bar heights and shock clicks, then ask the AI Crew Chief which adjustment calmed down corner-exit wheelspin the last time the track slicked off. For maintenance, pairing RaceNight Pro with RacePrep goes beyond simple calendar reminders by counting actual laps run on every component from engines and transmissions down to hubs and rod bolts, while letting your crew members join the team on their own phones for free. ### Pick Circle Track App if, pick RaceNight if - Pick Circle Track App if: your setup routine revolves around Wehrs Machine Bluetooth Load Sticks and you want direct Bluetooth load capture from WM hardware. - Pick RaceNight if: you use mixed-brand shop scales and gauges, race any dirt, asphalt or kart class, want an AI Crew Chief trained on your own setup history, and want lap-based part wear tracking in RacePrep. ### Frequently asked questions #### Can I log load stick and pull-bar numbers in RaceNight? Yes. RaceNight supports custom and class-specific fields for 4-link angles, pull bars, lift bars, shock travel, bump stops and load-stick measurements, even if you measure with a non-Bluetooth gauge. #### Does RaceNight require buying specific scales or sensors? No. RaceNight works with any scale pad, stagger tape or pyrometer you already own in your trailer. #### Is RacePrep free for my pit crew? Yes. When the car owner subscribes to RacePrep or RaceNight Pro, invited crew members get free access on iOS and Android to run weekly checklists and update shared parts shopping lists. ### Sources - Circle Track App by Wehrs Machine, checked November 13, 2026: multi-car setup book, maintenance schedules, parts lists and Wehrs Machine platform overview. - Circle Track App on the Apple App Store, checked November 13, 2026: WM Bluetooth Load Stick integration and iOS features. - RaceYear RaceNight product page, checked November 13, 2026: features, offline support, LapLink and published pricing. --- ## How to use Longacre Connect and Intercomp iRaceWeigh with a setup app URL: https://www.raceyear.app/blog/longacre-and-intercomp-scales-with-setup-app Summary: Use Longacre Connect or Intercomp iRaceWeigh wireless scales with RaceNight and RacerRX to store full chassis setups, stagger, shocks and tire temps. Last reviewed: November 13, 2026 · By the RaceYear team · Checked November 13, 2026 Short answer: Longacre Connect and Intercomp iRaceWeigh are excellent wireless scale indicator apps, not full race-night setup binders. Use Longacre or Intercomp in the shop to read live Bluetooth corner weights while you turn weight jacks, then log those final corner weights alongside your springs, shocks, bar angles, stagger and pyrometer tire temps inside RaceNight (or snap a photo of your RC scale readout in RacerRX). Key takeaways - Longacre Connect pairs via Bluetooth with Longacre Elite and Elite Pro wireless scales and Elite Load Sticks, exporting weight sessions as CSV files. - Intercomp iRaceWeigh connects to Intercomp XBT Bluetooth scales, RFX wireless indicators (via Wi-Fi module) and Intercomp Digital Memory Air Pressure Gauges. - Scale apps record weights (and pressures on Intercomp), while handling changes at the track depend on the rest of the sheet: ride heights, camber, caster, panhard bar, 4-link bars, shock clicks and track state. - Pairing your scale app with RaceNight keeps weights, geometry and race results searchable in one offline binder. ### What scale apps capture vs what a full setup binder captures | Capability | Longacre Connect | Intercomp iRaceWeigh | RaceNight Setup App | Hardware required | Longacre Elite / Elite Pro wireless pads or Load Sticks (has demo mode) | Intercomp XBT scales, RFX + Wi-Fi module, or manual entry | None (works with any wired or wireless scale brand) | Live Bluetooth pad streaming | Yes (Longacre hardware) | Yes (Intercomp hardware) | No (records final corner weights and percentages) | Tire pressure memory sync | No | Yes (with Intercomp Bluetooth memory gauge) | Logs cold/hot pressures, bleed settings and 12-spot tire temps | Full suspension geometry, bars & shocks | Notes field only | Notes field only | Structured class templates for springs, shocks, 4-link, J-bar, camber, caster and toe | Track conditions & AI Crew Chief | No | No | Logs surface moisture/groove and powers AI Crew Chief recommendations | Platforms | iOS and Android | iOS and Android | iOS and Android (100% offline in the pits) ### A fast 4-step shop-to-track scaling workflow - Set tire pressures and level the pads first: Air all four tires to race pressure, verify pad level with shims or laser, put race fuel load in the cell and put driver weight in the seat. Read our full walkthrough on how to scale a race car. - Dial in cross-weight live on your scale app: Open Longacre Connect or Intercomp iRaceWeigh while turning jack bolts so you can watch LF, RF, LR, RR and cross-weight settle in real time. No Bluetooth pads? Plug your wired scale indicator numbers straight into our free corner weight and cross weight calculator. - Lock the baseline into RaceNight before loading the trailer: Enter your final corner weights, ride heights, spring rates, shock clicks and rear gear into RaceNight and save it as your shop baseline. - Log trackside changes offline between rounds: At the track, duplicate your baseline for Hot Laps, Heat and Feature. Record every half-turn of wedge, half-inch of stagger or click of rebound in seconds with zero cell signal so you always know how to get back to your shop baseline on Monday. ### What about 4-corner RC scales? If you scale 1/10 buggies, pan cars or dirt oval RC cars on a four-pad Bluetooth or LCD scale system (such as SkyRC or GForce), RacerRX includes a photo scale import: snap a picture of the four corner readouts on your pit mat and RacerRX fills the corner weights and percentages straight into your RC setup sheet. ### Frequently asked questions #### Can I use Intercomp iRaceWeigh without owning Bluetooth scales? Yes, iRaceWeigh includes a manual entry mode for typing four corner weights, or you can use RaceYear’s free browser corner weight calculator with zero install or sign-up. #### Why shouldn’t I just put my shock and bar specs in the scale app’s notes box? Free-text notes cannot be filtered or compared cleanly across 30 race nights. Structured fields in RaceNight let you compare two setups field by field and let the AI Crew Chief spot patterns across tracks. #### Does cross-weight use RF + LR or LF + RR? Oval racers almost universally define cross-weight (wedge) as (RF + LR) divided by total weight. Road racers often track (LF + RR). Both RaceNight and our free corner weight calculator support oval cross-weight and rear bite (LR minus RR). ### Sources - Longacre Racing Products, checked November 13, 2026: Longacre Connect app, Elite Pro wireless scale systems, Elite Load Sticks and CSV export features. - Intercomp Racing, checked November 13, 2026: iRaceWeigh mobile app, XBT Bluetooth scales, RFX wireless indicators and Digital Memory Air Pressure Gauge connectivity. --- ## Trackside setup apps vs chassis simulation (Performance Trends & SusProg3D) URL: https://www.raceyear.app/blog/setup-apps-vs-circle-track-simulation-software Summary: Compare Windows chassis software (Performance Trends Circle Track Analyzer, SusProg3D) with mobile setup apps like RaceNight for shop and pit tuning. Last reviewed: November 13, 2026 · By the RaceYear team · Prices checked November 13, 2026 Short answer: Desktop kinematics programs like Performance Trends Circle Track Analyzer ($219.95 to $319.95 on Windows) and SusProg3D ($300 on Windows) solve winter shop engineering problems: pickup-point coordinates, roll center migration, bump steer curves and camber gain. Mobile setup apps like RaceNight ($3.99 to $12.99/month on iOS and Android) solve Saturday night execution: logging what is actually bolted on the car, tracking tire temps and track changes with zero cell signal, and asking an AI Crew Chief what to adjust before the feature. Key takeaways - Performance Trends Circle Track Analyzer and SusProg3D run exclusively on Windows PCs and require measuring dozens of 3D chassis XYZ pickup points with a plumb bob, tape and digital level. - Most grassroots racers run proven factory chassis (Rocket, Longhorn, Bicknell, Port City, Fury, Maxim, Triple X) where frame pickup points are fixed and weekly speed comes from springs, bars, shocks, scales and stagger. - Teams that do use SusProg3D or Performance Trends in January still need an offline trackside setup binder like RaceNight from April through October to record real-world changes and results. ### Desktop kinematics simulators vs mobile trackside setup apps | Category | Performance Trends Circle Track Analyzer | SusProg3D | RaceNight Mobile Setup App | Primary job | Simulate oval lap times, weight transfer and roll centers from full vehicle geometry | 3D suspension kinematics: instant centers, camber gain, anti-dive/squat and bump steer | Record shop baselines, trackside adjustments, scales, tire temps and AI tuning notes | Platforms | Windows PC (XP through Windows 11) | 64-bit Windows PC (Windows 10/11) | iPhone, iPad and Android (works 100% offline in the pits) | Published price (USD) | ~$219.95 Standard; ~$319.95 Plus (one-time license) | $300 base license ($120 additional seats) | $3.99/mo ($39.99/yr) AI; $12.99/mo ($99.99/yr) Pro; 14-day free trial | Setup time to get value | Hours of measuring spindle, A-arm and chassis pickup coordinates | Hours of 3D coordinate measurement and CAD-style input | Under 3 minutes using pre-built Late Model, Modified, Sprint, Stock or Kart templates | Usable between heat and feature | Rarely (requires laptop and geometry re-entry) | Shop engineering tool | Built specifically for 10-minute pit thrash windows ### When do you actually need desktop suspension software? If you fabricate your own front clip, relocate upper control arm mounts on a street stock, or compare two different spindle kingpin angles over three inches of suspension dive, a kinematics calculator earns its price tag in a single winter. SusProg3D plots exact instant center paths, anti-squat percentages and steering linkage curves through bump and roll, while Performance Trends links suspension changes to simulated corner speed. If you race a crate late model, IMCA modified, sportsman or sprint car from a major chassis builder, the builder has already engineered the pickup points and hands you a baseline book. Your job every Saturday night is hitting ride heights, dialing cross-weight, picking rear gear ratio and adapting to the dirt or asphalt in front of you. ### How to combine winter geometry math with weekly RaceNight logs - Run quick pit math directly in your phone browser: For gearing, scales and tire tape math that do not require 3D CAD coordinates, use RaceYear’s free quick change gear ratio calculator, corner weight calculator and tire stagger calculator. - Save your chassis builder or simulator baseline in RaceNight: Enter your approved ride heights, upper A-arm slugs, 4-link holes, panhard bar height and spring rates as a named Baseline in RaceNight. - Track real-world tire temps and lap times against the model: Simulation assumes a theoretical tire curve; pyrometer readings tell you what the tire actually did. Log inside, middle and outside tire temps after hot laps in RaceNight and let the AI Crew Chief compare tonight’s balance against every prior race at that track. ### Frequently asked questions #### Do Performance Trends or SusProg3D run on iPhone, iPad or Mac? No. Both Performance Trends Circle Track Analyzer and SusProg3D are Windows desktop applications. RaceNight runs natively on iOS and Android. #### Can RaceNight store 4-link holes, J-bar heights and shock valving? Yes. RaceNight includes dedicated class templates for 4-link dirt cars, swing-arm and Z-link setups, torsion-bar sprint cars, leaf-spring stocks and asphalt coilover/big-bar soft-spring cars. #### What if I also want to track engine and suspension part laps? RaceNight Pro includes RacePrep, which syncs your completed laps from each race night so you know exact lap counts on valve springs, rod bolts, hubs and shocks. ### Sources - Performance Trends Circle Track Analyzer, checked November 13, 2026: Windows system requirements, Standard and Plus pricing and simulation capabilities. - SusProg3D Suspension Design Software, checked November 13, 2026: Windows 64-bit platform requirements, US $300 base license pricing and kinematics features. - RaceYear RaceNight product page, checked November 13, 2026: mobile platforms, offline setup sheets and pricing. --- ## RC shock oil weight to cSt chart: Associated, TLR, Kyosho & XRAY URL: https://www.raceyear.app/blog/rc-shock-oil-weight-to-cst-chart Summary: Convert RC silicone shock oil Weight (WT) to Centistokes (cSt) across Team Associated, Losi/TLR, Kyosho and XRAY, with track tuning tips for RacerRX. Last reviewed: November 13, 2026 · By the RaceYear team Short answer: Centistokes (cSt) measures actual kinematic fluid viscosity in laboratory units, while Weight (WT) is a non-standardized bottle label that varies by brand. As a baseline rule in 1/10 RC shocks, 30 WT is roughly 350 cSt, 32.5 WT (Associated) is ~400 cSt, and 35 WT (TLR) is ~400 cSt. Always log both the brand and the cSt number on your RacerRX setup sheet so you can repeat damping feel accurately. Key takeaways - European and Japanese kits (XRAY, Kyosho, Mugen Seiki, Schumacher) specify silicone shock and differential oil in cSt (or nearly identical cP/cps). - US brands (Team Associated Factory Team and Losi / Team Losi Racing) historically label shock oil in WT, though newer TLR bottles print both WT and cSt on the label. - Because WT has no industry-wide formula, switching from 35 WT in one brand to 35 WT in another can change your damping by 25 to 50 cSt, roughly half a tuning step. - Cold winter indoor pits thicken silicone oil; hot summer outdoor tracks thin it out by the equivalent of 2.5 to 5 WT. ### RC silicone shock oil WT to cSt conversion chart Use this cross-reference table when copying a setup sheet across brands. Values reflect commonly published manufacturer bottle ratings and viscosity cross-references; always avoid mixing two different brands on opposite left/right corners of the same axle. | Kinematic Viscosity (cSt) | Team Associated (WT) | Losi / TLR (WT) | XRAY / Kyosho / Metric | Typical 1/10 RC Use | 100 cSt | 10 WT | 15 WT (~104 cSt) | 100 cSt | Ultra-light pan car center dampener or frigid outdoor play | 150 cSt | 15 WT | 17.5 WT | 150 cSt | 1/12 pan car front/center micro shocks | 200 cSt | 20 WT | 20 WT | 200 cSt | Light oval / low-grip rough dirt | 250 cSt | 22.5 WT | 25 WT | 250 cSt | Slick dirt oval rear shocks, soft 2WD rear baseline | 300 cSt | 25 WT | 27.5 WT | 300 cSt | 1/10 2WD buggy rear on low-to-medium grip clay | 350 cSt | 30 WT | 30 WT | 350 cSt | Universal 1/10 buggy & Mudboss rear starting baseline | 400 cSt | 32.5 WT | 35 WT | 400 cSt | 1/10 2WD/4WD buggy front on clay; high-grip rear | 425 cSt | 35 WT | Between 35 & 37.5 WT | ~425 cSt | High-grip clay front or carpet buggy rear | 450 cSt | 37.5 WT | 37.5 WT | 450 cSt | High-grip carpet / astro 1/10 front shocks | 500 cSt | 40 WT | 40 WT | 500 cSt | High-bite carpet front or heavy 1/8 scale buggy | 550 cSt | 42.5 WT | 45 WT | 550 cSt | 1/8 buggy & truggy medium-temp outdoor | 600 cSt | 47.5 WT | Between 45 & 50 WT | 600 cSt | 1/8 off-road warm weather / big jumps | 650 cSt | 50 WT | 55 WT | 650 cSt | 1/8 truggy front or hot summer outdoor | 800 cSt | 60 WT | ~70 WT | 800 cSt | Heavy touring car / speed-run / drag damping | 1000 cSt | 80 WT | ~95 WT | 1000 cSt | Pan car side tubes or light gear-diff fluid ### How shock oil viscosity changes RC handling Shock oil weight controls how fast weight transfers, not how much total weight transfers in steady-state cornering. Thicker oil (higher cSt) slows suspension movement down: the car feels flatter, jumps and lands without slapping the chassis, and responds faster to initial steering input on smooth high-grip carpet, at the cost of losing mechanical grip over sharp ruts. Thinner oil (lower cSt) lets the tires follow bumps and generate faster mechanical traction on slick dirt or dusty clay, though going too thin lets the chassis roll too abruptly and bottom out on flat landings. For deeper spring and ride-height pairing, read our guide on RC shock oil, springs and ride height. ### Track piston holes alongside oil weight A 400 cSt oil behind a 2 x 1.6 mm piston feels totally different than 400 cSt behind a 3 x 1.4 mm piston. Smaller piston holes build more high-speed damping resistance (called pack) on jump faces and hard landings while staying supple in slow corner roll. Whenever you log a shock rebuild in RacerRX, save four details together: oil brand, WT/cSt rating, piston hole count and diameter, and ambient pit temperature. ### Frequently asked questions #### Are cSt and cps the same for RC shock oil? They are slightly different physics units (centistokes vs centipoise, separated by silicone fluid density around 0.96 to 0.97), so a 400 cP oil is roughly 412 cSt. Never mix cP and cSt bottles blindly across left and right shocks, and stick to one brand across all four corners when possible. #### How much should I change shock oil at a time? Move in steps of 50 cSt (or 2.5 to 5 WT). Smaller changes than 25 cSt are almost impossible to feel on the driver’s stand once track grip shifts. #### Does silicone shock oil wear out? Pure silicone fluid resists breakdown well, yet aluminum shock bore wear and dirt pulled past O-ring seals contaminate the oil within a few race days. Fresh grey oil will feel noticeably more consistent after a rebuild. #### Where can I run RC gearing and speed math? Use RaceYear’s free RC gear ratio and rollout calculator and RC top speed calculator, or save every setup sheet offline in RacerRX (14-day free trial on iOS and Android). ### Sources - PetitRC Silicone Oil Viscosity Comparison Chart, checked November 13, 2026: cross-brand WT and cSt silicone shock oil measurements across Associated, Losi and metric brands. - RSRC Viscosity Converter from WT to CPS/cSt, checked November 13, 2026: kinematic viscosity definitions and brand consistency guidance. --- ## RC internal gear ratio chart by car: Associated, TLR, Traxxas & Tekno URL: https://www.raceyear.app/blog/rc-internal-gear-ratio-chart Summary: Lookup RC transmission internal gear ratios for Team Associated B7/B6.4, TLR 22 5.0, Traxxas Slash 2WD, Custom Works Outlaw 4, Tekno EB410 and pan cars. Last reviewed: November 13, 2026 · By the RaceYear team Short answer: To calculate final drive ratio (FDR) or rollout, multiply (Spur Teeth / Pinion Teeth) by your car’s internal transmission ratio. Common baselines: Team Associated B7 / B6.4 is 2.60, TLR 22 5.0 is 2.43, Traxxas Slash 2WD (Mudboss) is 2.72, Custom Works Outlaw 4 is 2.61, Tekno EB410 is 2.50, and direct-drive pan cars and Mini-Z are 1.00. Plug your number straight into our free RC gear ratio and rollout calculator. Key takeaways - Two 1/10 buggies running the exact same 78T spur and 24T pinion will have different final drive ratios if their internal gearbox ratios differ (for example, 8.45 FDR in an Associated B7 vs 7.90 FDR in a TLR 22 5.0). - Direct-drive 1/12 and 1/10 carpet oval pan cars mount the spur gear directly on the rear axle, making the internal ratio 1.00. - 4WD shaft-driven buggies compute internal ratio by dividing the differential ring gear teeth by the input bevel pinion teeth. - Saving your car’s internal ratio once in RacerRX lets every setup sheet compute FDR and rollout automatically whenever you swap pinions. ### Internal transmission gear ratio reference table | Chassis / Platform | Class | Internal Ratio | Transmission Notes | Team Associated RC10B7 / B7D | 1/10 2WD Buggy | 2.60:1 | 3-gear and 5-gear laydown gearboxes share 2.60 internal math | Team Associated RC10B6.4 / B6.3 / B6.1 | 1/10 2WD Buggy & Oval conversions | 2.60:1 | 3-gear laydown / layback transmission (52T diff / 20T top shaft) | Team Associated B74.2 | 1/10 4WD Buggy | 2.50:1 | 4WD gear differentials (40T ring / 16T input bevel) | TLR 22 5.0 (DC / AC / Elite) | 1/10 2WD Buggy & Dirt Oval | 2.43:1 | 3-gear laydown transmission; requires ~1-2T smaller pinion than AE 2.60 for equal FDR | Traxxas Slash 2WD (Stock / Mudboss) | Salvas Mudboss / Short Course | 2.72:1 | Magnum 272 / 272R 2WD gearbox | Custom Works Outlaw 4 / Enforcer 7 | 1/10 Dirt Oval Sprint & Late Model | 2.61:1 | 2.6-class dirt oval transmission | Tekno EB410 / EB410.2 | 1/10 4WD Buggy | 2.50:1 | Shaft-driven 4WD (40T diff ring / 16T pinion, sometimes listed ~2.47-2.50) | XRAY XB2 (2024-2026) | 1/10 2WD Buggy | 2.65:1 | Check manual if running optional diff/top-shaft gears | 1/12 & 1/10 Direct-Drive Pan Cars (CRC, Awesomatix, Schumacher) | Carpet Oval & On-Road Pan Car | 1.00:1 | Spur sits directly on solid/ball-diff rear axle; tune by foam tire rollout | Kyosho Mini-Z RWD / MR-03 / MR-04 | 1/28 Scale On-Road & Mini-Z | 1.00:1 | Motor pinion drives axle spur directly; ratio = Spur / Pinion ### How to calculate your own internal ratio from manual part numbers If your car or aftermarket oval conversion transmission is not in the table above, open the exploded gearbox diagram in your kit manual and count only the driven and driving gears (idler gears only reverse rotation and cancel out of the math): - 2WD multi-gear transmission: Internal Ratio = Differential Gear Teeth / Top-Shaft Gear Teeth (for example, 52 / 20 = 2.60). - Belt-drive touring or 4WD car: Internal Ratio = Differential Pulley Teeth / Center Layshaft Pulley Teeth (for example, 38 / 20 = 1.90). - Shaft-drive 4WD buggy or truck: Internal Ratio = Diff Ring Gear Teeth / Input Bevel Gear Teeth (for example, 40 / 16 = 2.50). ### Run your FDR, rollout and speed numbers instantly Once you have your internal ratio, open our free RC gear ratio, FDR and rollout calculator to see your exact FDR plus a five-pinion lookup table (-2 to +2 teeth), or open the RC top speed calculator to pair KV and LiPo voltage with your gearing. Want those numbers saved permanently with your shock oils, tires and lap times? Download RacerRX on iOS or Android and start a 14-day free trial. ### Frequently asked questions #### Do idler gears change my internal gear ratio? No. Adding or removing idler gears (such as switching between a 3-gear and 4-gear or 5-gear transmission) changes motor rotation direction and torque reaction, not the numerical gear ratio between the top shaft and differential. #### Why did my motor overheat when I copied a friend’s pinion and spur? If your friend runs a Traxxas 2.72 gearbox and you run a TLR 2.43 gearbox, the same spur and pinion gives you a numerically lower FDR (taller gearing), working your motor harder and building heat. Always match FDR or rollout, never raw pinion tooth count across different brands. #### When should I tune by rollout instead of FDR? Use rollout whenever tire diameter changes across runs, especially on foam-tire carpet oval pan cars, Mini-Z, or spec classes where tire truing shrinks diameter every race day. Read our full guide on RC gear ratio and rollout. ### Sources - Team Associated official manuals, checked November 13, 2026: RC10B7 and RC10B6.4 2.60:1 internal gearbox specifications. - Team Losi Racing (TLR), checked November 13, 2026: TLR 22 5.0 2.43:1 laydown transmission ratio. - Custom Works RC, checked November 13, 2026: Outlaw 4 dirt oval sprint car 2.61:1 transmission specification. --- ## RaceTrips vs spreadsheets and mileage apps for racing taxes URL: https://www.raceyear.app/blog/racetrips-vs-spreadsheets-and-mileage-apps Summary: Compare RaceTrips with QuickBooks, general mileage apps and spreadsheets for logging race purse payouts, trailer miles, receipts and IRS Schedule C. Last reviewed: November 13, 2026 · By the RaceYear team · Educational overview, not tax or legal advice Short answer: General accounting tools like QuickBooks Self-Employed, generic GPS mileage apps (MileIQ, Hurdlr) and Excel spreadsheets work fine for rideshare drivers or consultants, yet miss how grassroots racing operates: race-weekend trip bundles, cash pit passes, purse checks vs 1099-NEC forms, sponsor checks and IRC Section 183 business-vs-hobby documentation. RaceTrips organizes every dollar and tow mile by race trip for $39.99 per tax year (with your first 8 trip reports free) and exports a clean Schedule C summary for your CPA. Key takeaways - Generic GPS mileage trackers split a single Saturday race trip into five disconnected drives (shop, fuel stop, parts store, track, home) and mingle personal weekday errands with race-hauler miles. - Full accounting suites often cost $20 to $35+ every month ($240 to $420/year) and force racers to invent custom chart-of-accounts categories for pit passes, entry fees, tires and contingency awards. - Spreadsheets cost $0 upfront, yet collapse in October when faded thermal receipts from June sit unlogged in the truck console. - RaceTrips costs $39.99 per tax year after 8 free trip reports, attaches receipt photos right in the trailer, and groups income and expenses per race weekend. Note: RaceYear builds RaceTrips. Nothing in this article is tax or legal advice; always review your deductions and entity structure with a qualified CPA or enrolled agent. ### How RaceTrips compares to spreadsheets, mileage apps and QuickBooks | Feature | RaceTrips | Generic Mileage / Receipt Apps | QuickBooks / General Accounting | Spreadsheets (Excel / Sheets) | Built around race weekends & tracks | Yes (groups purse, pit passes, fuel, lodging, parts and tow miles per race trip) | No (logs isolated drives and generic business meals/supplies) | No (general small-business ledger) | Only if you build and maintain every formula yourself | Purse, contingency & sponsor income | Dedicated racing income categories ready for 1099-NEC matching | Basic generic income tags | Invoicing-focused workflow | Manual columns | Receipt photo attachment in the pits | Yes (iOS & Android camera capture tied to the trip) | Yes | Yes | No native receipt attachment per row | Schedule-C-ready tax summary export | Yes (built for handing straight to your tax preparer) | Generic self-employed CSV/PDF | Full accounting reports | Manual pivot tables | Typical annual cost (USD) | $39.99 / tax year (first 8 trip reports free) | ~$60 to $120/year | ~$240 to $420+/year | $0 (high manual time cost) ### Why racing tax records fail IRS scrutiny with generic tools When a race team operates as a for-profit business rather than a hobby (read our guide on racing as a business vs a hobby), tax examiners look for contemporaneous, businesslike records showing how each expense connected to a specific race event or testing session. Read our deep dive on IRS audit records for racers. A shoebox of pit-gate wristbands and fuel station slips without dates, track names or odometer logs creates headaches for your CPA in March. Logging each trip inside RaceTrips before you pull out of the pit gate ties the track name, date, round-trip hauler mileage, pit passes, tire bill and feature payout into one permanent trip packet. ### When a spreadsheet or QuickBooks still makes sense - Use QuickBooks (plus RaceTrips or a bookkeeper) if: you run a multi-car commercial team with payroll, W-2 mechanics, inventory resale or corporate chassis manufacturing that requires double-entry balance sheets. - Use a spreadsheet if: you only run three local races all year as a casual hobby and are not claiming Schedule C business deductions. - Use RaceTrips if: you are a grassroots single-car or family team running 8 to 60+ nights a year who wants every receipt, tow mile and payout organized for Schedule C without paying $30/month all winter. ### Frequently asked questions #### Can I test RaceTrips on real race weekends before paying? Yes. Every account includes your first 8 trip reports completely free on iOS and Android, with no monthly subscription trap. Adding unlimited trips for the full tax year is $39.99. #### Does RaceTrips file my taxes with the IRS? No. RaceTrips organizes your racing income, expenses, mileage and receipt images into a clean, Schedule-C-mapped report that you hand to your CPA or use alongside your tax filing software. #### Should I claim standard mileage or actual expenses on my tow rig and trailer? The right choice depends on vehicle weight ratings, depreciation rules and business-use percentage. Read our full breakdown on racing mileage and trailer deductions and confirm with your tax professional. ### Sources - IRS: What Kind of Records Should I Keep?, checked November 13, 2026: substantiation rules for business income, travel and expense records. - IRS: About Schedule C (Form 1040), Profit or Loss from Business, checked November 13, 2026: sole proprietor profit and loss reporting categories. - RaceYear RaceTrips product page, checked November 13, 2026: 8 free trip reports, $39.99/tax year pricing and Schedule C summary export. --- ## 4. Technical Racing Glossary Additions (124 Total Terms at https://www.raceyear.app/glossary) ### Pill inserts (https://www.raceyear.app/glossary/pill-inserts) - Also called: hinge pin pills, suspension arm inserts, A/B/C/D block pills - Definition: Pill inserts are small eccentric plastic or aluminum bushings pressed into RC suspension blocks (A, B, C and D mounts) to change hinge-pin angle and height in fixed steps. - In practice: Modern 1/10 and 1/8 off-road and dirt oval kits from Team Associated, TLR, XRAY and Tekno hold inner suspension hinge pins inside aluminum mounts fitted with replaceable eccentric pills, usually marked with dots or degree numbers such as 0.5 and 1.0. Rotating or swapping pills in the C and D rear mounts alters rear toe-in, anti-squat and inner hinge-pin roll center height without buying new blocks. Moving pills up raises the inner pivot and frees the car up in high-grip carpet; moving rear C-block pills out adds rear toe-in for forward traction on slick clay. Always write down both the dot size and arrow orientation on your setup sheet because one flipped pill changes handling across the whole corner. - Why it matters: One flipped or misread suspension pill changes rear toe, anti-squat or roll center by a full degree, making pill diagrams one of the highest-value fields on an RC setup sheet. - Deep dive: https://www.raceyear.app/blog/rc-camber-caster-toe ### Centistokes (cSt) (https://www.raceyear.app/glossary/centistokes-cst) - Also called: cSt viscosity, kinematic viscosity, silicone oil cSt - Definition: Centistokes (cSt) is the laboratory unit of kinematic viscosity used to rate silicone RC shock and gear-differential oils on a standardized scale. - In practice: Unlike Weight (WT) labels, which have no shared industry formula and shift by 25 to 50 cSt from one bottle brand to the next, centistokes measures how fast silicone fluid flows through a calibrated tube at a set temperature. Typical 1/10 RC shock oils fall between 250 cSt and 500 cSt (roughly 22.5 WT to 40 WT), while sealed gear differentials use 1,000 cSt to 500,000+ cSt fluid to control how aggressively power splits between inside and outside tires. Move shock oils in 50 cSt steps so the damping change is clear on the track, and avoid mixing two oil brands on opposite sides of the same car. - Why it matters: Logging silicone fluid in cSt alongside the bottle brand prevents surprise damping shifts when you copy a teammate's setup sheet across Associated, TLR, XRAY or Kyosho oils. - Deep dive: https://www.raceyear.app/blog/rc-shock-oil-weight-to-cst-chart ### Shock pack (https://www.raceyear.app/glossary/shock-pack) - Also called: high-speed damping pack, piston pack - Definition: Shock pack is the rapid rise in hydraulic resistance inside a shock absorber when the piston moves at high shaft speed, such as hitting a sharp jump face or flat-landing. - In practice: Low-speed chassis roll in a smooth sweeper pushes oil gently through the shock piston holes, whereas slapping a jump face forces oil through those same holes several times faster. Smaller piston hole diameters (for example, switching from 2 x 1.7 mm to 3 x 1.4 mm with similar total hole area) increase turbulence and create more pack: the car resists bottoming on big landings while still rolling plushly in slow turns. Too much pack makes the tires skip and chatter across square-edged chop on blown-out dirt; too little pack lets the chassis slap the ground and bounce out of rhythm sections. - Why it matters: Understanding pack lets you fix bottoming on big jumps with piston hole size instead of over-thickening shock oil and ruining slow-corner traction. - Deep dive: https://www.raceyear.app/blog/rc-shock-oil-weight-to-cst-chart ### Caster split (https://www.raceyear.app/glossary/caster-split) - Also called: cross caster, stagger caster, left-to-right caster difference - Definition: Caster split is the intentional difference between right-front and left-front caster angles on an oval race car, creating gentle pull toward the inside wall to help the car turn left. - In practice: On counter-clockwise dirt and asphalt ovals, teams almost always run more positive caster in the right-front spindle than in the left-front spindle. For example, 2 degrees positive LF and 4.5 degrees positive RF gives 2.5 degrees of caster split. As the wheels steer left into turn one, positive RF caster jacks weight slightly onto the left-rear and lifts the right-front corner while adding favorable negative camber gain, helping the car enter the corner without fighting the steering wheel. Too much caster split pulls hard down the straightaways and can hike the left-front tire or loosen corner entry. - Why it matters: Caster split sets how naturally an oval car turns into the corner and how hard it pulls in the driver's hands down the chutes. - Deep dive: https://www.raceyear.app/blog/loose-vs-tight-race-car ### Load stick (https://www.raceyear.app/glossary/load-stick) - Also called: suspension load gauge, shock travel load tool - Definition: A load stick is a rigid telescoping bar with an inline force load cell that replaces or parallels a shock absorber to measure exact wheel or corner spring force at compressed race travel. - In practice: Static corner weights on flat shop scales only show what the car weighs sitting still at ride height, before bump stops, progressive coils, pull bars or stacked springs engage. With a load stick (from builders like Longacre, Wehrs Machine or Intercomp), a crew pulls the car down to exact corner-entry attitude with a winch or jack, locks the load stick at target shock eye-to-eye travel, and reads the true poundage holding that corner up. Logging both static ride height and compressed load-stick poundage ensures you reproduce the exact dynamic platform week after week, even after swapping spring brands or bump rubbers. - Why it matters: Static scale numbers miss coil-bind and bump-stop forces; load-stick readings show the real poundage the tire sees at peak corner travel. - Deep dive: https://www.raceyear.app/blog/racenight-vs-circle-track-app ### Torsion bar (https://www.raceyear.app/glossary/torsion-bar) - Also called: splined torsion spring, sprint car bar - Definition: A torsion bar is a heat-treated steel spring rod splined at both ends that twists along its length to support the chassis instead of compressing like a coil spring. - In practice: Sprint cars, midgets, micro sprints and classic torsion-bar modifieds mount splined torsion bars across the frame rails, linking one end to a torsion stop (adjuster bolt) on the chassis and the other end to a torsion arm connected to the axle. Bar stiffness is rated by shaft diameter in thousandths of an inch, such as a .975, 1.000 or 1.050 bar: thicker bars twist less and raise wheel rate rapidly (stiffness scales with the fourth power of diameter). Between hot laps and the feature, crews swap a torsion bar in under two minutes or turn the stop bolt to adjust ride height and cross-weight. - Why it matters: A 0.025-inch jump in torsion bar diameter produces a noticeable rate change, and torsion arm angle plus stop height must be logged together to repeat ride heights. - Deep dive: https://www.raceyear.app/blog/racenight-vs-pitlogic ### Jacobs ladder (https://www.raceyear.app/glossary/jacobs-ladder) - Also called: sprint car Watt's link, rear axle lateral locator - Definition: A Jacobs ladder is a triangulated dual-link rear suspension locator used on sprint cars and midgets to center the live rear axle laterally while setting the rear roll center height. - In practice: Unlike a single Panhard bar that swings in an arc, a Jacobs ladder bolts to the right side of the frame rail and links via two angled straps to a vertical pin on the rear-end birdcage or axle center section. Where those straps intersect geometrically defines the rear roll center height, typically adjusted by moving the chassis pin up or down through pre-drilled mounting holes. Raising the Jacobs ladder raises the rear roll center and plants harder initial rear traction on corner entry, though going too high can make the car skate or hike on a dry-slick surface; lowering it calms the rear down and adds side-bite consistency. - Why it matters: Moving the Jacobs ladder one hole on the frame changes rear roll center height immediately without touching torsion bar stops or stagger. - Deep dive: https://www.raceyear.app/blog/panhard-bar-j-bar-setup ### Roll steer (https://www.raceyear.app/glossary/roll-steer) - Also called: axle roll steer, roll oversteer, roll understeer - Definition: Roll steer is the geometric steering angle the rear axle develops relative to the chassis centerline as the car rolls in a corner, driven by trailing-arm or 4-link angles. - In practice: When an oval car dives and rolls onto the right-rear corner, uphill or downhill 4-link bars, leaf springs or truck arms move the right-rear wheelbase backward and the left-rear wheelbase forward (or vice versa). If the rear axle points slightly toward the outside wall in roll, the rear end steps out and helps rotate the car through the center of the corner (roll oversteer, common on dirt late models and modifieds). Too much roll oversteer makes the car snap-loose on corner entry; dialing out bar angle reduces roll steer so the car drives straighter off the exit on slick tracks. - Why it matters: Roll steer controls mid-corner rotation and forward drive off the corner, making 4-link and trailing-arm angles critical setup-sheet entries. - Deep dive: https://www.raceyear.app/blog/setup-apps-vs-circle-track-simulation-software ### Scrub radius (https://www.raceyear.app/glossary/scrub-radius) - Also called: kingpin offset at ground, steering scrub - Definition: Scrub radius is the lateral distance on the ground between the tire's center contact patch and the imaginary line drawn through the upper and lower ball joints (steering axis). - In practice: Look at the front tire from straight ahead: draw a line through the upper and lower ball joints down to the pavement or dirt, and compare where it hits against the middle of the tire tread. When the tire centerline sits outside the steering axis line, scrub radius is positive, which is standard on oval cars fitted with wide wheel offsets or wheel spacers. Adding a half-inch wheel spacer on the right-front widens track width and increases positive scrub radius, giving stronger steering feedback and jacking effect, while excessive scrub radius increases steering kickback over ruts and drags speed on braking. - Why it matters: Swapping wheel backspacing or adding hub spacers changes scrub radius alongside track width, altering steering effort, brake pull and front tire heat. - Deep dive: https://www.raceyear.app/blog/setup-apps-vs-circle-track-simulation-software ### Kingpin inclination (https://www.raceyear.app/glossary/kingpin-inclination) - Also called: KPI, steering axis inclination, SAI, spindle pin angle - Definition: Kingpin inclination (KPI) is the inward tilt of the front steering axis (through the upper and lower ball joints or kingpin) toward the center of the car when viewed from the front. - In practice: Spindles on full-size stock cars, modifieds, late models and sprint cars are machined with specific kingpin inclination angles, commonly 7 to 12 degrees depending on the rulebook and front clip. Higher KPI works together with caster to lift the front corner slightly as the wheels turn and reduces scrub radius without tucking the brakes outside the wheel hoop. Because KPI tilts the steering axis inward, changing spindle KPI changes camber gain as the wheels steer: oval teams match left-front and right-front spindle KPI specs carefully when replacing a bent spindle after wall contact. - Why it matters: Installing a replacement spindle with the wrong KPI degree spec throws off static camber, scrub radius and dynamic steering weight jacking. - Deep dive: https://www.raceyear.app/blog/setup-apps-vs-circle-track-simulation-software --- ## 5. 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