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BoP Lab / Classes / STU

STU vs FA vs SM vs FE2 pace at every track

Lap times across years say as much about the weather as the class. % of STU is each class's best lap as a share of STU's on the same day, so the conditions drop out: 100% is level, less is quicker, and a move in it is the class getting faster or slower against the field.

Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
ASB-SpecEPvsFA×FCvsFE2×FFFPFVFXGT1GT2GTXHPPP2vsSM×SMXSRF3STLSTU×T1T2T3T4Show 51 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: STU 100.0% of STU Eric Heinrich, Daytona International Speedway Runoffs 2015 race · FA 71.2% of STU Alex Mayer, Virginia International Raceway Runoffs 2022 race · SM 91.3% of STU Travis Wiley, Virginia International Raceway Runoffs 2022 race · FE2 86.7% of STU Jason Conzo, Virginia International Raceway Runoffs 2022 race

1:201:402:002:202:4033 rule changes between Runoffs 2018 and Runoffs 201933 ▾36 rule changes between Runoffs 2019 and Runoffs 202036 ▾35 rule changes between Runoffs 2020 and Runoffs 202135 ▾29 rule changes between Runoffs 2021 and Runoffs 202229 ▾11 rule changes between Runoffs 2022 and Runoffs 202311 ▾8 rule changes between Runoffs 2023 and Runoffs 20248 ▾26 rule changes between Runoffs 2024 and Runoffs 202526 ▾25 rule changes between Runoffs 2025 and Runoffs 202625 ▾STU race best at Runoffs 2015: 2:06.756 (Eric Heinrich)STU race best at Runoffs 2016: 1:34.597 (Cameron Maugeri)STU race best at Runoffs 2017: 1:49.387 (Rob Huffmaster)STU race best at Runoffs 2018: 1:46.514 (Kevin Boehm)STU race best at Runoffs 2019: 2:00.483 (Kevin Boehm)STU race best at Runoffs 2020: 2:28.410 (Anthony Geraci)STU race best at Runoffs 2021: 1:47.441 (Joe Moser)STU race best at Runoffs 2022: 2:32.357 (Mark Liller)STU race best at Runoffs 2023: 2:02.302 (Mark Liller)STU race best at Runoffs 2024: 2:25.824 (Thomas Noble)STU race best at Runoffs 2025: 2:24.497 (Chip Herr)STU race best at Runoffs 2026: 2:26.416 (Richard Astacio)STU qualifying best at Runoffs 2015: 2:05.494 (Eric Heinrich)STU qualifying best at Runoffs 2016: 1:32.738 (Joe Moser)STU qualifying best at Runoffs 2017: 1:48.921 (Rob Huffmaster)STU qualifying best at Runoffs 2018: 1:19.234 (Franklin Church)STU qualifying best at Runoffs 2019: 1:59.948 (Kevin Boehm)STU qualifying best at Runoffs 2020: 2:27.883 (David Fiorelli)STU qualifying best at Runoffs 2021: 1:47.078 (Joe Moser)STU qualifying best at Runoffs 2022: 2:00.615 (Johan Schwartz)STU qualifying best at Runoffs 2023: 2:00.389 (Johan Schwartz)STU qualifying best at Runoffs 2024: 2:26.227 (Thomas Noble)STU qualifying best at Runoffs 2025: 2:23.083 (Peter Cunningham)STU qualifying best at Runoffs 2026: 2:24.912 (Richard Astacio)FA race best at Runoffs 2015: 1:48.162 (Tyler Hunter)Off the chart: FA race best at Runoffs 2016: 1:19.009 (Ryan Norman)FA race best at Runoffs 2017: 1:31.365 (Keith Grant)FA race best at Runoffs 2018: 1:29.924 (Mirl Swan)FA race best at Runoffs 2019: 1:43.107 (Dario Cangialosi)FA race best at Runoffs 2020: 2:04.746 (Spencer Brockman)FA race best at Runoffs 2021: 1:30.650 (James French)FA race best at Runoffs 2022: 1:48.507 (Alex Mayer)FA race best at Runoffs 2024: 2:01.790 (Dudley Fleck)FA race best at Runoffs 2025: 2:02.654 (Hans Peter)FA race best at Runoffs 2026: 2:03.334 (James French)FA qualifying best at Runoffs 2015: 1:47.758 (Tyler Hunter)Off the chart: FA qualifying best at Runoffs 2016: 1:14.920 (Ryan Norman)FA qualifying best at Runoffs 2017: 1:29.957 (Sedat Yelkin)FA qualifying best at Runoffs 2018: 1:28.176 (Mirl Swan)FA qualifying best at Runoffs 2019: 1:41.545 (Dario Cangialosi)FA qualifying best at Runoffs 2020: 2:04.274 (Spencer Brockman)FA qualifying best at Runoffs 2021: 1:29.701 (James French)FA qualifying best at Runoffs 2022: 1:44.703 (Chip Romer)FA qualifying best at Runoffs 2024: 2:01.560 (Hans Peter)FA qualifying best at Runoffs 2025: 2:00.923 (Hans Peter)FA qualifying best at Runoffs 2026: 2:02.513 (Dudley Fleck)SM race best at Runoffs 2015: 2:24.067 (Todd Lamb)SM race best at Runoffs 2016: 1:40.764 (Michael Carter)SM race best at Runoffs 2017: 1:59.100 (Michael Gagliardo)SM race best at Runoffs 2018: 1:55.278 (Michael Carter)SM race best at Runoffs 2019: 2:16.459 (Elivan Goulart)SM race best at Runoffs 2020: 2:43.748 (Preston Pardus)SM race best at Runoffs 2021: 1:58.837 (Brian Henderson)SM race best at Runoffs 2022: 2:19.107 (Travis Wiley)SM race best at Runoffs 2023: 2:16.229 (Julian DaCosta)SM race best at Runoffs 2024: 2:41.486 (Brett Kowalski)SM race best at Runoffs 2025: 2:44.430 (Kyle Greenhill)SM race best at Runoffs 2026: 2:42.725 (Francisco Barroso)SM qualifying best at Runoffs 2015: 2:18.661 (Andrew Carbonell)SM qualifying best at Runoffs 2016: 1:40.514 (Justin Hille)SM qualifying best at Runoffs 2017: 1:58.306 (Chris Haldeman)SM qualifying best at Runoffs 2018: 1:54.355 (Ken Sutherland)SM qualifying best at Runoffs 2019: 2:14.552 (Todd Buras)SM qualifying best at Runoffs 2020: 2:42.209 (Kyle Greenhill)SM qualifying best at Runoffs 2021: 1:57.695 (Brian Henderson)SM qualifying best at Runoffs 2022: 2:14.664 (Danny Steyn)SM qualifying best at Runoffs 2023: 2:14.986 (Danny Steyn)SM qualifying best at Runoffs 2024: 2:41.106 (Ethan Goulart)SM qualifying best at Runoffs 2025: 2:43.111 (Bobby Gossett)SM qualifying best at Runoffs 2026: 2:42.173 (Brett Kowalski)FE2 race best at Runoffs 2018: 1:35.563 (Flinn Lazier)FE2 race best at Runoffs 2019: 1:52.154 (Liam Snyder)FE2 race best at Runoffs 2020: 2:13.271 (Owen McAllister)FE2 race best at Runoffs 2021: 1:36.655 (Max Grau)FE2 race best at Runoffs 2022: 2:12.045 (Jason Conzo)FE2 race best at Runoffs 2023: 1:51.098 (Franklin Futrelle)FE2 race best at Runoffs 2024: 2:12.748 (Porter Aiken)FE2 race best at Runoffs 2025: 2:13.339 (Franklin Futrelle)FE2 race best at Runoffs 2026: 2:11.881 (Franklin Futrelle)FE2 qualifying best at Runoffs 2018: 1:35.040 (Flinn Lazier)FE2 qualifying best at Runoffs 2019: 1:51.062 (Liam Snyder)FE2 qualifying best at Runoffs 2020: 2:12.806 (Scott Rettich)FE2 qualifying best at Runoffs 2021: 1:36.395 (Max Grau)FE2 qualifying best at Runoffs 2022: 1:50.853 (Charles Russell Turner)FE2 qualifying best at Runoffs 2023: 1:50.665 (Charles Russell Turner)FE2 qualifying best at Runoffs 2024: 2:11.506 (Porter Aiken)FE2 qualifying best at Runoffs 2025: 2:12.475 (Franklin Futrelle)FE2 qualifying best at Runoffs 2026: 2:12.326 (Franklin Futrelle)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
STUFASMFE2solid race · dashed qualifying · slower is lower
80%90%100%110%33 rule changes between Runoffs 2018 and Runoffs 201933 ▾36 rule changes between Runoffs 2019 and Runoffs 202036 ▾35 rule changes between Runoffs 2020 and Runoffs 202135 ▾29 rule changes between Runoffs 2021 and Runoffs 202229 ▾11 rule changes between Runoffs 2022 and Runoffs 202311 ▾8 rule changes between Runoffs 2023 and Runoffs 20248 ▾26 rule changes between Runoffs 2024 and Runoffs 202526 ▾25 rule changes between Runoffs 2025 and Runoffs 202625 ▾STU race best at Runoffs 2015: 100.0% of STU's (Eric Heinrich)STU race best at Runoffs 2016: 100.0% of STU's (Cameron Maugeri)STU race best at Runoffs 2017: 100.0% of STU's (Rob Huffmaster)STU race best at Runoffs 2018: 100.0% of STU's (Kevin Boehm)STU race best at Runoffs 2019: 100.0% of STU's (Kevin Boehm)STU race best at Runoffs 2020: 100.0% of STU's (Anthony Geraci)STU race best at Runoffs 2021: 100.0% of STU's (Joe Moser)STU race best at Runoffs 2022: 100.0% of STU's (Mark Liller)STU race best at Runoffs 2023: 100.0% of STU's (Mark Liller)STU race best at Runoffs 2024: 100.0% of STU's (Thomas Noble)STU race best at Runoffs 2025: 100.0% of STU's (Chip Herr)STU race best at Runoffs 2026: 100.0% of STU's (Richard Astacio)STU qualifying best at Runoffs 2015: 100.0% of STU's (Eric Heinrich)STU qualifying best at Runoffs 2016: 100.0% of STU's (Joe Moser)STU qualifying best at Runoffs 2017: 100.0% of STU's (Rob Huffmaster)STU qualifying best at Runoffs 2018: 100.0% of STU's (Franklin Church)STU qualifying best at Runoffs 2019: 100.0% of STU's (Kevin Boehm)STU qualifying best at Runoffs 2020: 100.0% of STU's (David Fiorelli)STU qualifying best at Runoffs 2021: 100.0% of STU's (Joe Moser)STU qualifying best at Runoffs 2022: 100.0% of STU's (Johan Schwartz)STU qualifying best at Runoffs 2023: 100.0% of STU's (Johan Schwartz)STU qualifying best at Runoffs 2024: 100.0% of STU's (Thomas Noble)STU qualifying best at Runoffs 2025: 100.0% of STU's (Peter Cunningham)STU qualifying best at Runoffs 2026: 100.0% of STU's (Richard Astacio)FA race best at Runoffs 2015: 85.3% of STU's (Tyler Hunter)FA race best at Runoffs 2016: 83.5% of STU's (Ryan Norman)FA race best at Runoffs 2017: 83.5% of STU's (Keith Grant)FA race best at Runoffs 2018: 84.4% of STU's (Mirl Swan)FA race best at Runoffs 2019: 85.6% of STU's (Dario Cangialosi)FA race best at Runoffs 2020: 84.1% of STU's (Spencer Brockman)FA race best at Runoffs 2021: 84.4% of STU's (James French)Off the chart: FA race best at Runoffs 2022: 71.2% of STU's (Alex Mayer)FA race best at Runoffs 2024: 83.5% of STU's (Dudley Fleck)FA race best at Runoffs 2025: 84.9% of STU's (Hans Peter)FA race best at Runoffs 2026: 84.2% of STU's (James French)FA qualifying best at Runoffs 2015: 85.9% of STU's (Tyler Hunter)FA qualifying best at Runoffs 2016: 80.8% of STU's (Ryan Norman)FA qualifying best at Runoffs 2017: 82.6% of STU's (Sedat Yelkin)FA qualifying best at Runoffs 2018: 111.3% of STU's (Mirl Swan)FA qualifying best at Runoffs 2019: 84.7% of STU's (Dario Cangialosi)FA qualifying best at Runoffs 2020: 84.0% of STU's (Spencer Brockman)FA qualifying best at Runoffs 2021: 83.8% of STU's (James French)FA qualifying best at Runoffs 2022: 86.8% of STU's (Chip Romer)FA qualifying best at Runoffs 2024: 83.1% of STU's (Hans Peter)FA qualifying best at Runoffs 2025: 84.5% of STU's (Hans Peter)FA qualifying best at Runoffs 2026: 84.5% of STU's (Dudley Fleck)SM race best at Runoffs 2015: 113.7% of STU's (Todd Lamb)SM race best at Runoffs 2016: 106.5% of STU's (Michael Carter)SM race best at Runoffs 2017: 108.9% of STU's (Michael Gagliardo)SM race best at Runoffs 2018: 108.2% of STU's (Michael Carter)SM race best at Runoffs 2019: 113.3% of STU's (Elivan Goulart)SM race best at Runoffs 2020: 110.3% of STU's (Preston Pardus)SM race best at Runoffs 2021: 110.6% of STU's (Brian Henderson)SM race best at Runoffs 2022: 91.3% of STU's (Travis Wiley)SM race best at Runoffs 2023: 111.4% of STU's (Julian DaCosta)SM race best at Runoffs 2024: 110.7% of STU's (Brett Kowalski)SM race best at Runoffs 2025: 113.8% of STU's (Kyle Greenhill)SM race best at Runoffs 2026: 111.1% of STU's (Francisco Barroso)SM qualifying best at Runoffs 2015: 110.5% of STU's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 108.4% of STU's (Justin Hille)SM qualifying best at Runoffs 2017: 108.6% of STU's (Chris Haldeman)Off the chart: SM qualifying best at Runoffs 2018: 144.3% of STU's (Ken Sutherland)SM qualifying best at Runoffs 2019: 112.2% of STU's (Todd Buras)SM qualifying best at Runoffs 2020: 109.7% of STU's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 109.9% of STU's (Brian Henderson)SM qualifying best at Runoffs 2022: 111.6% of STU's (Danny Steyn)SM qualifying best at Runoffs 2023: 112.1% of STU's (Danny Steyn)SM qualifying best at Runoffs 2024: 110.2% of STU's (Ethan Goulart)SM qualifying best at Runoffs 2025: 114.0% of STU's (Bobby Gossett)SM qualifying best at Runoffs 2026: 111.9% of STU's (Brett Kowalski)FE2 race best at Runoffs 2018: 89.7% of STU's (Flinn Lazier)FE2 race best at Runoffs 2019: 93.1% of STU's (Liam Snyder)FE2 race best at Runoffs 2020: 89.8% of STU's (Owen McAllister)FE2 race best at Runoffs 2021: 90.0% of STU's (Max Grau)FE2 race best at Runoffs 2022: 86.7% of STU's (Jason Conzo)FE2 race best at Runoffs 2023: 90.8% of STU's (Franklin Futrelle)FE2 race best at Runoffs 2024: 91.0% of STU's (Porter Aiken)FE2 race best at Runoffs 2025: 92.3% of STU's (Franklin Futrelle)FE2 race best at Runoffs 2026: 90.1% of STU's (Franklin Futrelle)Off the chart: FE2 qualifying best at Runoffs 2018: 119.9% of STU's (Flinn Lazier)FE2 qualifying best at Runoffs 2019: 92.6% of STU's (Liam Snyder)FE2 qualifying best at Runoffs 2020: 89.8% of STU's (Scott Rettich)FE2 qualifying best at Runoffs 2021: 90.0% of STU's (Max Grau)FE2 qualifying best at Runoffs 2022: 91.9% of STU's (Charles Russell Turner)FE2 qualifying best at Runoffs 2023: 91.9% of STU's (Charles Russell Turner)FE2 qualifying best at Runoffs 2024: 89.9% of STU's (Porter Aiken)FE2 qualifying best at Runoffs 2025: 92.6% of STU's (Franklin Futrelle)FE2 qualifying best at Runoffs 2026: 91.3% of STU's (Franklin Futrelle)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
STUFASMFE2solid race · dashed qualifying · each class's best lap as a share of STU's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventSTUFASMFE2
Qual best Race best Trap Qual best Race best Trap vs STU % of STU Qual best Race best Trap vs STU % of STU Qual best Race best Trap vs STU % of STU 
Road America Runoffs 20262026-09-282:24.912Richard Astacio · fastest of 17 · top 5 within 2.6s+1.829s (+1.28%)2:26.416Richard Astacio · fastest of 16 · top 5 within 1.5s+1.919s (+1.33%)145.1Hugh Stewart+0.8 mph (+0.5%)2:02.513Dudley Fleck · fastest of 9 · top 5 within 6.9s+1.590s (+1.31%)2:03.334James French · fastest of 10 · top 5 within 1.4s+0.680s (+0.55%)158.6John McAleer+1.5 mph (+1.0%)-23.082squal -22.399s84.2%qual 84.5%2:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%)2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%)119.6Wyatt Couch+0.3 mph (+0.3%)+16.309squal +17.261s111.1%qual 111.9%2:12.326Franklin Futrelle · fastest of 8 · top 5 within 1.9s-0.149s (-0.11%)2:11.881Franklin Futrelle · fastest of 8 · top 5 within 1.6s-1.458s (-1.09%)143.5Steve Whitston-5.5 mph (-3.7%)-14.535squal -12.586s90.1%qual 91.3%
25 rule changes (STU: 15, FA: 7, SM: 2, FE2: 1)8 weight · 7 induction · 3 engine · 3 tyres & wheels · 1 wording · 3 othershowhide
  • STU Wheel and tire requirements for GT3U #40679tyres & wheels
  • FA Update sealed engine teardown section #40621engine
  • SM Rear Toe Link #40271other
  • STU 9” Wheels #40433tyres & wheels
  • STU Weight adjustment to former GT3U cars #40474weight
  • FA Motor Classification #40175weight
  • STU Request to allow BMW M50B20TU engine in STU #40202engine
  • STU Calculating Weight #40224weight
  • STU Turbo Restrictor Size Increase Request #40008induction
  • STU GT86 Cups Car in STU #40028weight
  • SM Part Number Change Request #39914wording
  • STU Mazda Rx-8 Renesis - Streetported Variant & Added Weight #39785weight
  • STU Eliminate 33 and 34 mm TIRs #39872weight
  • STU Fab 9 Racing Intake Manifold in STU #39767induction
  • FA Pro Mazda Classification and Performance Enhancement Proposal #39411induction
  • FA Alternate Intake Manifold for MZR #38223induction
  • FA Engine Compression Rule Change Request #39302engine
  • FA Change Formula 1000 allowances #39608induction
  • STU Request for Permission on Aftermarket Turbo Kit and Intake #39529induction
  • STU Turbo Inlet Restrictor Table #38961induction
  • STU 275 Tire Rule #38983tyres & wheels
  • STU STU Honda Engine weight penalty #39375weight
  • FA Re-Consider USF Pro 2000 Car for Formula Atlantic Class #38783other
  • STU Non-Homologated Engine Swaps - Specifically K24A2 w/ Honda CRZ #38746weight
  • FE2 FE & FE2 Bubble Tail #38978other
Road America Runoffs 20252025-09-292:23.083Peter Cunningham · fastest of 16 · top 5 within 2.6s-3.144s (-2.15%)2:24.497Chip Herr · fastest of 15 · top 5 within 3.8s-1.327s (-0.91%)144.3Chip Herr-1.0 mph (-0.7%)2:00.923Hans Peter · fastest of 12 · top 5 within 2.4s-0.637s (-0.52%)2:02.654Hans Peter · fastest of 11 · top 5 within 3.1s+0.864s (+0.71%)157.0Shane Kennett-3.0 mph (-1.9%)-21.843squal -22.160s84.9%qual 84.5%2:43.111Bobby Gossett · fastest of 32 · top 5 within 0.3s+2.005s (+1.24%)2:44.430Kyle Greenhill · fastest of 28 · top 5 within 0.3s+2.944s (+1.82%)119.3Francisco Barroso-0.6 mph (-0.5%)+19.933squal +20.028s113.8%qual 114.0%2:12.475Franklin Futrelle · fastest of 11 · top 5 within 1.4s+0.969s (+0.74%)2:13.339Franklin Futrelle · fastest of 10 · top 5 within 0.6s+0.591s (+0.45%)149.0Steve Whitston+3.7 mph (+2.6%)-11.158squal -10.608s92.3%qual 92.6%
26 rule changes (STU: 18, FA: 3, SM: 4, FE2: 1)7 weight · 6 tyres & wheels · 3 engine · 2 cars added · 1 induction · 2 wording · 5 othershowhide
  • STU Lotus Weight Reduction E&O #38919weight
  • STU STU-TCR Adjustments #38723weight
  • STU Lotus Weight Reduction #38772weight -50 lbs
  • FA Ligier JS F3 Tire Choice #38434tyres & wheels
  • STU 2.8-3.2L N/A Engine Allowances #38007engine
  • STU 2006-2015 Mazda Miata Intake Manifold #38422induction
  • STU Requesting Approval of the JDM Honda h23a #38489cars added
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • STU Wheel Size Inconsistency #38018tyres & wheels
  • STU Table C: STU-GT3U Clarification #38268weight
  • FE2 Driver Safety & Comfort #37965other
  • FA Update Formula Renault 2.0 spec line notes #37853tyres & wheels
  • STU BMW N54/N55 Engine Allowance Follow Up #37447engine
  • STU STU Mini Cooper pulley size clarification re: letter #36980 #37717wording
  • STU Question About a Weight Modifier #37782weight
  • STU Increase Minimum Weight #37919weight +100 lbs
  • FA Classify FR European Championship car as spec line car in Table 2 #37658cars added
  • STU Audi 1.8t Wagon STU Table B #36685weight
  • STU Merger GT3 to STU #37486other
  • STU GT3 TCR Tire allowance #37494tyres & wheels
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • STU Request to Remove Miata Hubs from General category #37138tyres & wheels
  • STU BMW N54/N55 Engine Allowance #37146engine
  • STU R53 15% Pulley Request #36980other
Road America Runoffs 20242024-10-012:26.227Thomas Noble · fastest of 18 · top 5 within 2.3s-1.656s (-1.12%)2:25.824Thomas Noble · fastest of 17 · top 5 within 2.4s-2.586s (-1.74%)145.3Thomas Noble+1.1 mph (+0.8%)2:01.560Hans Peter · fastest of 13 · top 5 within 2.0s-2.714s (-2.18%)2:01.790Dudley Fleck · fastest of 12 · top 5 within 3.3s-2.956s (-2.37%)160.0Brandon Schwarz+9.4 mph (+6.3%)-24.034squal -24.667s83.5%qual 83.1%2:41.106Ethan Goulart · fastest of 49 · top 5 within 0.5s-1.103s (-0.68%)2:41.486Brett Kowalski · fastest of 43 · top 5 within 0.3s-2.262s (-1.38%)119.9Alex Bertagnoli-1.4 mph (-1.2%)+15.662squal +14.879s110.7%qual 110.2%2:11.506Porter Aiken · fastest of 18 · top 5 within 0.5s-1.300s (-0.98%)2:12.748Porter Aiken · fastest of 17 · top 5 within 2.0s-0.523s (-0.39%)145.3Porter Aiken+1.9 mph (+1.3%)-13.076squal -14.721s91.0%qual 89.9%
8 rule changes (STU: 4, SM: 4)1 engine · 1 induction · 1 suspension & brakes · 1 weight · 1 wording · 3 othershowhide
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • STU RWD Turbo Disadvantage #36255induction
  • STU Letter #35397 addendum #35453weight
  • STU S54 Drysump #35464other
  • STU ST Electric-Assisted Steering Systems #35066other
Virginia International Raceway Runoffs 20232023-09-232:00.389Johan Schwartz · fastest of 13 · top 5 within 2.3s-0.226s (-0.19%)2:02.302Mark Liller · fastest of 14 · top 5 within 1.6s-30.055s (-19.73%)144.0Mark Liller+0.1 mph (+0.1%)2:14.986Danny Steyn · fastest of 52 · top 5 within 0.1s+0.322s (+0.24%)2:16.229Julian DaCosta · fastest of 46 · top 5 within 0.3s-2.878s (-2.07%)120.3Jim Drago+1.1 mph (+0.9%)+13.927squal +14.597s111.4%qual 112.1%1:50.665Charles Russell Turner · fastest of 26 · top 5 within 2.3s-0.188s (-0.17%)1:51.098Franklin Futrelle · fastest of 19 · top 5 within 1.4s-20.947s (-15.86%)141.3Franklin Futrelle-0.6 mph (-0.4%)-11.204squal -9.724s90.8%qual 91.9%
11 rule changes (STU: 3, FA: 7, SM: 1)3 induction · 3 weight · 2 tyres & wheels · 1 cars added · 1 engine · 1 othershowhide
  • STU 2022 Toyota GR Cup for STU #34449cars added
  • FA Simplify Pro Formula Mazda wheel allowance #34190tyres & wheels
  • FA E&O - Correct Pro Formula Mazda spec line dimensional equivalent #34085tyres & wheels
  • FA Add new spec line for MSR Formula Mazda FMzR to Table 2 #34139other
  • STU Alternate OEM Miata Intake Manifold #33827induction
  • STU E&O STU NA Weight Chart. #33737weight
  • FA BDA Displacement #33431engine
  • SM BOP for NB1 and NB2 #32309weight
  • FA Reclassify 2010-2017 Formula Renault 2.0 as a spec line car in FA #33395weight
  • FA Change Swift 016 2.3L restrictor size and minimum weight #33472induction -30 lbs
  • FA Pro Formula Mazda Dimension E&O #33160induction
Virginia International Raceway Runoffs 20222022-09-242:00.615Johan Schwartz · fastest of 21 · top 5 within 2.6s+0.667s (+0.56%)2:32.357Mark Liller · fastest of 19 · top 5 within 4.3s+31.874s (+26.46%)143.9Johan Schwartz+0.1 mph (+0.1%)1:44.703Chip Romer · fastest of 7 · top 5 within 4.0s+3.158s (+3.11%)1:48.507Alex Mayer · fastest of 4 · top 4 within 4.2s+5.400s (+5.24%)154.6Austin Hill-1.4 mph (-0.9%)-43.850squal -15.912s71.2%qual 86.8%2:14.664Danny Steyn · fastest of 60 · top 5 within 0.2s+0.112s (+0.08%)2:19.107Travis Wiley · fastest of 58 · top 5 within 0.9s+2.648s (+1.94%)119.2Jonathan Neudorf-0.6 mph (-0.5%)-13.250squal +14.049s91.3%qual 111.6%1:50.853Charles Russell Turner · fastest of 25 · top 5 within 1.1s-0.209s (-0.19%)2:12.045Jason Conzo · fastest of 22 · top 5 within 1.8s+19.891s (+17.74%)141.9Eric Cruz-0.6 mph (-0.5%)-20.312squal -9.762s86.7%qual 91.9%
29 rule changes (STU: 21, FA: 7, SM: 1)9 weight · 7 engine · 2 aero · 2 cars added · 2 induction · 2 tyres & wheels · 1 suspension & brakes · 4 othershowhide
  • STU Request Mazda 13 B turbo #32668induction
  • STU Hood Vents and Intercooler Scoops #32733other
  • STU Non 4 valve weight reduction removed #32808weight
  • STU Error in new minimum weight table when combined with other text #32711weight
  • STU Redundant Language in May GCR #32713engine
  • FA Update FR Americas rulebook requirement #32491engine
  • FA Clarify verification of sealed engine compliance #32522engine
  • FA Clarify Formula Lites and FR Americas sealed engine requirement #32523engine
  • STU Opposed to the Proposed STU Weight Chart #32381weight
  • STU Clarification request for GCR 9.1.4.D.3.a Splitter Definition #32414aero
  • FA E&O FA Transmission section #32251tyres & wheels
  • FA E&O Swift 016 2.5 liter Aero column #32363aero
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • STU Request Adjustment to Min Weight for STU BMW E36 M3 (95-99) #31535weight -90 lbs
  • STU BMW E36 M3 Canadian (North American) S50B32 engine #31866engine
  • STU Engine Swap Origin Country #32209engine
  • STU CRX/Civic Del Sol #32214cars added
  • STU Error correction #32383weight
  • STU Single TB Weight Modifiers Add to Chart #32393weight
  • FA Closing the Gap #31934other
  • STU Single TB Weight Modifiers #31449weight
  • STU Request to Remove A4 1.8t from STU Spec Line Tables #31465weight
  • STU Improved Touring Tires #32063tyres & wheels
  • FA Reorganize Tables 1 and 2 #31985weight
  • STU Request Allowance for Balance Shaft Delete in STU #31434engine
  • STU Request Louvers in hood vents #31916other
  • STU Request to Add Honda K23 Spec Line #30682cars added
  • STU RE: Aug FT letter 30682 #31060other
  • STU Throttling Device Clarification #31323induction
Indianapolis Motor Speedway Runoffs 20212021-09-251:47.078Joe Moser · fastest of 30 · top 5 within 2.0s-1.843s (-1.69%)1:47.441Joe Moser · fastest of 28 · top 5 within 1.8s-1.946s (-1.78%)146.9Kip VanSteenburg1:29.701James French · fastest of 18 · top 5 within 2.7s-0.256s (-0.28%)1:30.650James French · fastest of 17 · top 5 within 6.1s-0.715s (-0.78%)155.5James French-16.791squal -17.377s84.4%qual 83.8%1:57.695Brian Henderson · fastest of 90 · top 5 within 0.5s-0.611s (-0.52%)1:58.837Brian Henderson · fastest of 88 · top 5 within 0.3s-0.263s (-0.22%)119.8Kyle Greenhill+11.396squal +10.617s110.6%qual 109.9%1:36.395Max Grau · fastest of 28 · top 5 within 0.7s1:36.655Max Grau · fastest of 28 · top 5 within 0.7s146.2Gray Fowler-10.786squal -10.683s90.0%qual 90.0%
35 rule changes (STU: 12, FA: 22, SM: 1)10 weight · 7 engine · 3 tyres & wheels · 2 cars added · 2 induction · 2 removed · 1 aero · 1 suspension & brakes · 2 wording · 5 othershowhide
  • FA E&O Table 2 engine names #31085engine
  • FA Move Toyota 1800 to Table 2 #30822removed
  • FA E&O Swift 016 wheel width reference #30939tyres & wheels
  • FA Update FA rules package #30717engine
  • FA Move Mazda MZR/Ford Duratec 2296cc and 2500cc to Table 2 #30718removed
  • FA Clean up Table 2 Mazda MZR 2.0L and Honda Civic K20Z3 spec lines #30719other
  • STU STU Fender flares #30696tyres & wheels
  • STU Request weight reduction for 12A bridgeport motor in Miata #30751weight -200 lbs
  • FA E&O Mazda MZR 2.0 and Honda Civic K20Z3 chassis eligibility #30632other
  • FA Correct engine name in Swift 016 2.3 liter spec line #30447engine
  • FA Correct engine name in Swift 016 2.5 liter spec line #30448engine
  • FA Revise Table 1 Spec Lines and clarify application of Engine Notes #30456engine
  • STU Request for Fender Flare Clarification #30375weight
  • FA Update Table 1 Weights for Spec Lines C, I, and K #30355weight -25 lbs
  • FA Remove redundant reference in Table 2 spec line #30366weight
  • FA Correct the name of the FR Americas car #30369wording
  • FA Clean up Spec Line D in Table 1 #30372weight
  • FA Table 2 Honda K20Z3 request #30386induction
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • STU Provision for Interchangeable Engine Components Already Allowed #30342engine
  • STU ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
  • FA E&O FA Intake Restrictors #30273induction
  • FA Clean up Spec Lines A and B in Table 1 #30274weight
  • FA Clean up Spec Line C in Table 1 #30275weight
  • FA Clean up Spec Lines J and L in Table 1 #30276weight
  • FA Move engine specifications to Pro Formula Mazda spec line notes #30278engine
  • FA Update F3 Americas spec line #30280other
  • STU Super Touring Alternate Miata Hubs #30345tyres & wheels
  • STU Brake Component Relocation #29990suspension & brakes
  • STU Porsche PDK #30081weight
  • STU Reference Letter #29333 Proposed STU 13B Spec Line Changes #30086weight
  • STU Drive Shaft Request #30087other
  • FA Request to classify Formula Lites Crawford FL15 #29702cars added
  • STU 13B Rules Adjustment #29333cars added
  • STU Request clarification on wing measurement #29640aero
Road America Runoffs 20202020-10-022:27.883David Fiorelli · fastest of 14 · top 5 within 4.1s2:28.410Anthony Geraci · fastest of 14 · top 5 within 3.1s144.2David Fiorelli2:04.274Spencer Brockman · fastest of 11 · top 5 within 2.7s2:04.746Spencer Brockman · fastest of 10 · top 5 within 2.4s150.6Hans Peter-23.664squal -23.609s84.1%qual 84.0%2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill+15.338squal +14.326s110.3%qual 109.7%2:12.806Scott Rettich · fastest of 25 · top 5 within 0.6s2:13.271Owen McAllister · fastest of 23 · top 5 within 0.7s143.4Owen McAllister-15.139squal -15.077s89.8%qual 89.8%
36 rule changes (STU: 17, FA: 15, SM: 2, FE2: 2)8 engine · 8 induction · 8 weight · 3 aero · 2 tyres & wheels · 1 removed · 1 suspension & brakes · 1 wording · 4 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • FE2 FE/FE2 Oil Cooler #29293wording
  • STU Request for Advanced Aero Rule Wording Clarification. #29124aero
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • STU Minimum Weight Determination #27695weight
  • STU ST Gurney flap Wicker clarification #29012aero
  • FA Request to Adjust FB Weight for Stock Engines #29005weight
  • STU Request for Alternate Intake Manifold #26514induction
  • STU Request for Addition to GT3 Approved Turbo List #27576induction
  • STU Request BoP for my Car #29004induction
  • STU Sequential Shifters in STU #29031other
  • FA E&O permitted engine modifications #28831engine
  • FA E&O Transmissions #28832other
  • FA Swift 016 Gurney flap wicker clarification #28884aero
  • STU Rotary Help #27833weight
  • FA Remove redundant spec line in Table 1 #28720removed
  • FA E&O general engine rules #28772engine
  • FA Request higher compression ratio and prior weights for F1000 cars #28162engine
  • FA Remove redundant wheel dimension provisions #28554tyres & wheels
  • FA E&O Formula 3 spec line #28596induction
  • STU Request to approve Honda S2000 HKS supercharger #27281engine
  • STU Request BoP on the Lotus #27637weight +100 lbs
  • STU Turbo Inlet Restrictor On MK5 Volkswagen #27704induction
  • STU Honda K20C1 removal #27732induction
  • STU Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0 #27884engine
  • STU Alternate Engine for Porsche 944 #28259engine
  • FA FA weight correction/clarification #28430engine
  • STU Please Modify the STU Wheel Size Rule for Clarity #27694weight
  • STU Turbo Engine Cars Base Weight #28032weight
  • FA Request to merge FB into FA #25611weight
  • FA Suggestions for FB/F1000 into FA #27319other
  • FA Change Swift 016 - 2.3 liter Mazda Duratec restrictor size #27880induction
  • FA Move wheel dimensions from Bodywork subsection to #27493tyres & wheels
  • FA Table 2 Mazda MZR 2.0 E&O #27640other
  • FE2 FE / FE2 Update Rules #27624weight
  • STU Request for an electronic throttle body #27342induction
Virginia International Raceway Runoffs 20192019-10-051:59.948Kevin Boehm · fastest of 25 · top 5 within 3.5s2:00.483Kevin Boehm · fastest of 25 · top 5 within 2.5s143.8Kevin Boehm1:41.545Dario Cangialosi · fastest of 8 · top 5 within 2.8s1:43.107Dario Cangialosi · fastest of 8 · top 5 within 1.8s155.9Kent Vaccaro-17.376squal -18.403s85.6%qual 84.7%2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s119.8Jim Drago+15.976squal +14.604s113.3%qual 112.2%1:51.062Liam Snyder · fastest of 20 · top 5 within 1.3s1:52.154Liam Snyder · fastest of 19 · top 5 within 0.7s142.6Robert Vanman-8.329squal -8.886s93.1%qual 92.6%
33 rule changes (STU: 22, FA: 7, SM: 4)9 weight · 6 induction · 4 engine · 3 aero · 3 cars added · 2 suspension & brakes · 2 tyres & wheels · 1 removed · 2 wording · 1 othershowhide
  • FA Follow up to Letter #27344 on Honda Powered FA Rules #27363removed
  • FA Swift 014 Mazda MZR 2.0 E&O #27305weight
  • STU Request to correct E&O advanced aerodynamics #27290aero
  • STU Remove -2mm penalty from SR20DET Nissan #26982weight
  • STU Request clarification for manifold and throttle in STU #27004induction
  • FA Adjust Line N restrictor size and minimum weight #26691weight +30 lbs
  • STU Request to clarify afterrmarket side skirts exhaust exit #26814suspension & brakes
  • STU Wheel Flare wording #26872tyres & wheels
  • FA Add data plate requirement #26707other
  • STU Request Ride Height Clarification #26597suspension & brakes
  • STU Request to Use Japanese Mazda 13b Intake Manifold #25790induction
  • STU Request Alternate Intake for Mazda MZR In a Rear Wheel Drive App. #26352induction
  • STU E&O Suspension #26424wording
  • STU Revisit B20 VTEC #26530cars added
  • STU Move Flared Fenders to STU Advanced Aero #26564aero
  • STU TCA Civic SI E&O #26606induction
  • STU S54 Spec line #26620weight
  • FA Request to add FA engine spec lines #26183engine
  • SM Request to allow aftermarket fuel filters. #26370wording
  • STU Request to Class Assignment for 2017 Civic #24287cars added
  • STU Request to run E46 3246cc in STU #25126weight
  • STU Engine Classification for Rotary #25564engine
  • STU K24/K20 Head Swap Clarification/Amendment #25899induction
  • STU Request to Classify 12a Bridge Ported Rotary Engine #25985cars added
  • STU World Challenge Car Eligibility #26387weight
  • STU Request a phone call for discussion regarding weight #26398weight
  • STU Advanced Aero E&O #26413aero
  • FA FA MZR 2.0 Engine Specification #25814engine
  • FA FA 016 weight increase #26063weight
  • SM Request 99-00 replacement Wire harnesses #25602engine
  • SM Organize and Clarify 9.1.7.C.1.o. #25913weight
  • SM Strike Tire Tread Language #26123tyres & wheels
  • STU Request to Equalize Direct Injected Turbo Cars #24890induction
Sonoma Raceway Runoffs 20182018-10-101:19.234Franklin Church · fastest of 10 · top 5 within 21.5s1:46.514Kevin Boehm · fastest of 9 · top 5 within 7.4s103.0Franklin Church1:28.176Mirl Swan · fastest of 7 · top 5 within 4.0s1:29.924Mirl Swan · fastest of 7 · top 5 within 2.6s144.8Antony Opheim-16.590squal +8.942s84.4%qual 111.3%1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s102.2Danny Steyn+8.764squal +35.121s108.2%qual 144.3%1:35.040Flinn Lazier · fastest of 9 · top 5 within 1.5s1:35.563Flinn Lazier · fastest of 9 · top 5 within 1.7s126.8Scott Rettich-10.951squal +15.806s89.7%qual 119.9%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:48.921Rob Huffmaster · fastest of 34 · top 5 within 2.0s1:49.387Rob Huffmaster · fastest of 31 · top 5 within 2.4s1:29.957Sedat Yelkin · fastest of 12 · top 5 within 2.3s1:31.365Keith Grant · fastest of 12 · top 5 within 1.0s-18.022squal -18.964s83.5%qual 82.6%1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s+9.713squal +9.385s108.9%qual 108.6%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:32.738Joe Moser · fastest of 16 · top 5 within 2.5s1:34.597Cameron Maugeri · fastest of 16 · top 5 within 0.8s1:14.920Ryan Norman · fastest of 5 · top 5 within 7.0s1:19.009Ryan Norman · fastest of 5 · top 5 within 4.7s-15.588squal -17.818s83.5%qual 80.8%1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s+6.167squal +7.776s106.5%qual 108.4%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:05.494Eric Heinrich · fastest of 18 · top 5 within 4.6s2:06.756Eric Heinrich · fastest of 17 · top 5 within 3.5s1:47.758Tyler Hunter · fastest of 10 · top 5 within 3.7s1:48.162Tyler Hunter · fastest of 8 · top 5 within 5.3s-18.594squal -17.736s85.3%qual 85.9%2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s+17.311squal +13.167s113.7%qual 110.5%

By track

TrackEvents Typical % of STU Best Latest 
Road America4100.0%100.0%Runoffs 2020100.0%Runoffs 2026
Virginia International Raceway3100.0%100.0%Runoffs 2019100.0%Runoffs 2023
Indianapolis Motor Speedway2100.0%100.0%Runoffs 2017100.0%Runoffs 2021
Daytona International Speedway1100.0%100.0%Runoffs 2015100.0%Runoffs 2015
Mid-Ohio Sports Car Course1100.0%100.0%Runoffs 2016100.0%Runoffs 2016
Sonoma Raceway1100.0%100.0%Runoffs 2018100.0%Runoffs 2018
About this data
Every event the class ran, at any track, oldest to newest on the chart and newest first in the table. Each point is the class's best lap as a share of STU's best on the same day: the weather and the day cancel out, so one figure compares across years where lap times cannot; a class that suits one track more than another still reads differently there. It still moves when the yardstick's own balance changes or its field thins, and an event the yardstick did not run has no point. A best from fewer than three cars is greyed. The rule changes that took effect between two events are folded between their rows.