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BoP Lab / Classes / STL

STL vs P1 vs SM pace at every track

Lap times across years say as much about the weather as the class. % of STL is each class's best lap as a share of STL'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)
AS+B-Spec+EP+FA+FC+FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+P+vsP1×P2+vsSM×SMX+SRF3+STL×STU+T1+T2+T3+T4+Show 50 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: STL 100.0% of STL Kevin Boehm, Daytona International Speedway Runoffs 2015 race · P1 72.7% of STL Lee Alexander, Indianapolis Motor Speedway Runoffs 2021 race · SM 96.8% of STL Brian Henderson, Indianapolis Motor Speedway Runoffs 2021 race

1:201:402:002:202:4029 rule changes between Runoffs 2018 and Runoffs 201929 ▾17 rule changes between Runoffs 2019 and Runoffs 202017 ▾27 rule changes between Runoffs 2020 and Runoffs 202127 ▾9 rule changes between Runoffs 2021 and Runoffs 20229 ▾10 rule changes between Runoffs 2022 and Runoffs 202310 ▾14 rule changes between Runoffs 2023 and Runoffs 202414 ▾7 rule changes between Runoffs 2024 and Runoffs 20257 ▾6 rule changes between Runoffs 2025 and Runoffs 20266 ▾STL race best at Runoffs 2015: 2:10.269 (Kevin Boehm)STL race best at Runoffs 2016: 1:36.625 (Kevin Boehm)STL race best at Runoffs 2017: 1:52.589 (Eric Kutil)STL race best at Runoffs 2018: 1:49.754 (Danny Steyn)STL race best at Runoffs 2019: 2:07.273 (Cliff Ira)STL race best at Runoffs 2020: 2:32.115 (Joe Moser)STL race best at Runoffs 2021: 2:02.711 (Joe Moser)STL race best at Runoffs 2022: 2:07.832 (Danny Steyn)STL race best at Runoffs 2023: 2:06.682 (Joe Moser)STL race best at Runoffs 2024: 2:30.245 (Joe Moser)STL race best at Runoffs 2025: 2:32.127 (Jose Osiris Pena)STL race best at Runoffs 2026: 2:30.657 (Danny Steyn)STL qualifying best at Runoffs 2015: 2:09.672 (Kevin Boehm)STL qualifying best at Runoffs 2016: 1:35.439 (John Schmitt)STL qualifying best at Runoffs 2017: 1:52.647 (Adam Roberts)STL qualifying best at Runoffs 2018: 1:49.138 (Danny Steyn)STL qualifying best at Runoffs 2019: 2:07.203 (Danny Steyn)STL qualifying best at Runoffs 2020: 2:31.420 (Danny Steyn)STL qualifying best at Runoffs 2021: 1:51.665 (Danny Steyn)STL qualifying best at Runoffs 2022: 2:05.474 (Danny Steyn)STL qualifying best at Runoffs 2023: 2:05.779 (Danny Steyn)STL qualifying best at Runoffs 2024: 2:30.063 (Joe Moser)STL qualifying best at Runoffs 2025: 2:32.065 (Jose Osiris Pena)STL qualifying best at Runoffs 2026: 2:30.537 (Derek Ketchie)P1 race best at Runoffs 2015: 1:49.792 (Gianpaolo Ciancimino)P1 race best at Runoffs 2016: 1:19.407 (Gianpaolo Ciancimino)P1 race best at Runoffs 2017: 1:31.499 (Jim Devenport)P1 race best at Runoffs 2018: 1:28.786 (Perry Richardson)P1 race best at Runoffs 2019: 1:43.498 (Todd Slusher)P1 race best at Runoffs 2020: 2:01.870 (James French)P1 race best at Runoffs 2021: 1:29.225 (Lee Alexander)P1 race best at Runoffs 2022: 1:54.095 (John Mcaleer)P1 race best at Runoffs 2023: 1:44.329 (Todd Vanacore)P1 race best at Runoffs 2024: 2:00.418 (Matt Romer)P1 qualifying best at Runoffs 2015: 1:49.219 (Jim Downing)Off the chart: P1 qualifying best at Runoffs 2016: 1:17.308 (James Devenport)P1 qualifying best at Runoffs 2017: 1:30.794 (Jim Devenport)P1 qualifying best at Runoffs 2018: 1:27.714 (Todd Slusher)P1 qualifying best at Runoffs 2019: 1:42.674 (Todd Slusher)P1 qualifying best at Runoffs 2020: 2:01.101 (James French)P1 qualifying best at Runoffs 2021: 1:29.011 (Lee Alexander)P1 qualifying best at Runoffs 2022: 1:41.601 (Todd Slusher)P1 qualifying best at Runoffs 2023: 1:42.602 (Todd Vanacore)P1 qualifying best at Runoffs 2024: 2:00.476 (Chip Romer)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)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
STLP1SMsolid race · dashed qualifying · slower is lower
80%90%100%110%29 rule changes between Runoffs 2018 and Runoffs 201929 ▾17 rule changes between Runoffs 2019 and Runoffs 202017 ▾27 rule changes between Runoffs 2020 and Runoffs 202127 ▾9 rule changes between Runoffs 2021 and Runoffs 20229 ▾10 rule changes between Runoffs 2022 and Runoffs 202310 ▾14 rule changes between Runoffs 2023 and Runoffs 202414 ▾7 rule changes between Runoffs 2024 and Runoffs 20257 ▾6 rule changes between Runoffs 2025 and Runoffs 20266 ▾STL race best at Runoffs 2015: 100.0% of STL's (Kevin Boehm)STL race best at Runoffs 2016: 100.0% of STL's (Kevin Boehm)STL race best at Runoffs 2017: 100.0% of STL's (Eric Kutil)STL race best at Runoffs 2018: 100.0% of STL's (Danny Steyn)STL race best at Runoffs 2019: 100.0% of STL's (Cliff Ira)STL race best at Runoffs 2020: 100.0% of STL's (Joe Moser)STL race best at Runoffs 2021: 100.0% of STL's (Joe Moser)STL race best at Runoffs 2022: 100.0% of STL's (Danny Steyn)STL race best at Runoffs 2023: 100.0% of STL's (Joe Moser)STL race best at Runoffs 2024: 100.0% of STL's (Joe Moser)STL race best at Runoffs 2025: 100.0% of STL's (Jose Osiris Pena)STL race best at Runoffs 2026: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2015: 100.0% of STL's (Kevin Boehm)STL qualifying best at Runoffs 2016: 100.0% of STL's (John Schmitt)STL qualifying best at Runoffs 2017: 100.0% of STL's (Adam Roberts)STL qualifying best at Runoffs 2018: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2019: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2020: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2021: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2022: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2023: 100.0% of STL's (Danny Steyn)STL qualifying best at Runoffs 2024: 100.0% of STL's (Joe Moser)STL qualifying best at Runoffs 2025: 100.0% of STL's (Jose Osiris Pena)STL qualifying best at Runoffs 2026: 100.0% of STL's (Derek Ketchie)P1 race best at Runoffs 2015: 84.3% of STL's (Gianpaolo Ciancimino)P1 race best at Runoffs 2016: 82.2% of STL's (Gianpaolo Ciancimino)P1 race best at Runoffs 2017: 81.3% of STL's (Jim Devenport)P1 race best at Runoffs 2018: 80.9% of STL's (Perry Richardson)P1 race best at Runoffs 2019: 81.3% of STL's (Todd Slusher)P1 race best at Runoffs 2020: 80.1% of STL's (James French)Off the chart: P1 race best at Runoffs 2021: 72.7% of STL's (Lee Alexander)P1 race best at Runoffs 2022: 89.3% of STL's (John Mcaleer)P1 race best at Runoffs 2023: 82.4% of STL's (Todd Vanacore)P1 race best at Runoffs 2024: 80.1% of STL's (Matt Romer)P1 qualifying best at Runoffs 2015: 84.2% of STL's (Jim Downing)P1 qualifying best at Runoffs 2016: 81.0% of STL's (James Devenport)P1 qualifying best at Runoffs 2017: 80.6% of STL's (Jim Devenport)P1 qualifying best at Runoffs 2018: 80.4% of STL's (Todd Slusher)P1 qualifying best at Runoffs 2019: 80.7% of STL's (Todd Slusher)P1 qualifying best at Runoffs 2020: 80.0% of STL's (James French)P1 qualifying best at Runoffs 2021: 79.7% of STL's (Lee Alexander)P1 qualifying best at Runoffs 2022: 81.0% of STL's (Todd Slusher)P1 qualifying best at Runoffs 2023: 81.6% of STL's (Todd Vanacore)P1 qualifying best at Runoffs 2024: 80.3% of STL's (Chip Romer)SM race best at Runoffs 2015: 110.6% of STL's (Todd Lamb)SM race best at Runoffs 2016: 104.3% of STL's (Michael Carter)SM race best at Runoffs 2017: 105.8% of STL's (Michael Gagliardo)SM race best at Runoffs 2018: 105.0% of STL's (Michael Carter)SM race best at Runoffs 2019: 107.2% of STL's (Elivan Goulart)SM race best at Runoffs 2020: 107.6% of STL's (Preston Pardus)SM race best at Runoffs 2021: 96.8% of STL's (Brian Henderson)SM race best at Runoffs 2022: 108.8% of STL's (Travis Wiley)SM race best at Runoffs 2023: 107.5% of STL's (Julian DaCosta)SM race best at Runoffs 2024: 107.5% of STL's (Brett Kowalski)SM race best at Runoffs 2025: 108.1% of STL's (Kyle Greenhill)SM race best at Runoffs 2026: 108.0% of STL's (Francisco Barroso)SM qualifying best at Runoffs 2015: 106.9% of STL's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 105.3% of STL's (Justin Hille)SM qualifying best at Runoffs 2017: 105.0% of STL's (Chris Haldeman)SM qualifying best at Runoffs 2018: 104.8% of STL's (Ken Sutherland)SM qualifying best at Runoffs 2019: 105.8% of STL's (Todd Buras)SM qualifying best at Runoffs 2020: 107.1% of STL's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 105.4% of STL's (Brian Henderson)SM qualifying best at Runoffs 2022: 107.3% of STL's (Danny Steyn)SM qualifying best at Runoffs 2023: 107.3% of STL's (Danny Steyn)SM qualifying best at Runoffs 2024: 107.4% of STL's (Ethan Goulart)SM qualifying best at Runoffs 2025: 107.3% of STL's (Bobby Gossett)SM qualifying best at Runoffs 2026: 107.7% of STL's (Brett Kowalski)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
STLP1SMsolid race · dashed qualifying · each class's best lap as a share of STL's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventSTLP1SM
Qual best Race best Trap Qual best Race best Trap vs STL % of STL Qual best Race best Trap vs STL % of STL 
Road America Runoffs 20262026-09-282:30.537Derek Ketchie · fastest of 16 · top 5 within 2.9s-1.528s (-1.00%)2:30.657Danny Steyn · fastest of 16 · top 5 within 0.6s-1.470s (-0.97%)134.8Mike Taylor+2.6 mph (+2.0%)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%)+12.068squal +11.636s108.0%qual 107.7%
6 rule changes (STL: 4, SM: 2)3 weight · 1 removed · 1 wording · 1 othershowhide
  • SM Rear Toe Link #40271other
  • STL Spec Line Clean Up #40344removed
  • STL Calculating Weight #40224weight
  • SM Part Number Change Request #39914wording
  • STL Classifications #39885weight
  • STL Weight adjustment for STL #39579weight
Road America Runoffs 20252025-09-292:32.065Jose Osiris Pena · fastest of 14 · top 5 within 3.4s+2.002s (+1.33%)2:32.127Jose Osiris Pena · fastest of 13 · top 5 within 2.4s+1.882s (+1.25%)132.2Jon Sewell-2.1 mph (-1.5%)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%)+12.303squal +11.046s108.1%qual 107.3%
7 rule changes (STL: 3, SM: 4)2 tyres & wheels · 2 weight · 1 wording · 2 othershowhide
  • STL Lotus Weight Reduction #38772weight -50 lbs
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • STL E&O: SMX Allowance in STL #37945weight
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • STL Request to Remove Miata Hubs from General category #37138tyres & wheels
Road America Runoffs 20242024-10-012:30.063Joe Moser · fastest of 18 · top 5 within 3.7s-1.357s (-0.90%)2:30.245Joe Moser · fastest of 16 · top 5 within 4.2s-1.870s (-1.23%)134.3Joe Moser+1.3 mph (+1.0%)2:00.476Chip Romer · fastest of 12 · top 5 within 1.5s-0.625s (-0.52%)2:00.418Matt Romer · fastest of 9 · top 5 within 2.1s-1.452s (-1.19%)168.3Jason Miller+8.7 mph (+5.4%)-29.827squal -29.587s80.1%qual 80.3%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%)+11.241squal +11.043s107.5%qual 107.4%
14 rule changes (STL: 4, P1: 6, SM: 4)4 induction · 3 engine · 3 weight · 1 suspension & brakes · 1 wording · 2 othershowhide
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • P1 Update GCR section 9.1.8.B.J.7 #35907engine
  • P1 Remove redundant effective date language in GCR 9.1.8.B.J.4 #35693induction
  • P1 Correct engine series terminology #35694engine
  • STL ST Electric-Assisted Steering Systems #35066other
  • STL BOP Adjustments #35112weight
  • STL Mazda 12A #35320induction
  • P1 Please correct omitted punctuation #34890weight
  • P1 Adjust restrictors and weights for Engine Table lines H and I #35229induction
  • P1 Revise Group CN Honda K20A-FD2 Spec Line #35337weight
  • STL Alternate Carburetor Request for 79-85 RX7 12a #35181induction
Virginia International Raceway Runoffs 20232023-09-232:05.779Danny Steyn · fastest of 22 · top 5 within 3.4s+0.305s (+0.24%)2:06.682Joe Moser · fastest of 20 · top 5 within 1.5s-1.150s (-0.90%)131.8Danny Steyn+0.1 mph (+0.1%)1:42.602Todd Vanacore · fastest of 10 · top 5 within 0.9s+1.001s (+0.99%)1:44.329Todd Vanacore · fastest of 9 · top 5 within 0.7s-9.766s (-8.56%)158.5Jason Miller+1.2 mph (+0.8%)-22.353squal -23.177s82.4%qual 81.6%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%)+9.547squal +9.207s107.5%qual 107.3%
10 rule changes (STL: 2, P1: 7, SM: 1)4 tyres & wheels · 3 induction · 2 aero · 1 weightshowhide
  • P1 SIR Testing #34354induction
  • P1 E&O Single Inlet Restrictor abbreviation, etc. #34369induction
  • P1 E&O Clean up ducted air provision #34410tyres & wheels
  • STL Clarify STL table B - IT spec notes on Tires #34187tyres & wheels
  • P1 E&O - Correct dimensional equivalents #34018tyres & wheels
  • P1 November 2022 Rules Clarification for Suspension Covers #33615aero
  • SM BOP for NB1 and NB2 #32309weight
  • STL Spec MX5 in STL #33473tyres & wheels
  • P1 Clarify body panel coverage of suspension components #33318aero
  • P1 E&O clarification regarding forced induction #33123induction
Virginia International Raceway Runoffs 20222022-09-242:05.474Danny Steyn · fastest of 24 · top 5 within 2.3s-1.729s (-1.36%)2:07.832Danny Steyn · fastest of 22 · top 5 within 1.9s+0.559s (+0.44%)131.7Trever Degioanni-3.2 mph (-2.3%)1:41.601Todd Slusher · fastest of 9 · top 5 within 2.3s-1.073s (-1.05%)1:54.095John Mcaleer · fastest of 9 · top 5 within 1.4s+10.597s (+10.24%)157.2Jason Miller+1.3 mph (+0.8%)-13.737squal -23.873s89.3%qual 81.0%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%)+11.275squal +9.190s108.8%qual 107.3%
9 rule changes (STL: 5, P1: 3, SM: 1)3 induction · 2 tyres & wheels · 2 weight · 1 suspension & brakes · 1 wordingshowhide
  • P1 Clarify authorization to use flat plate intake restrictor #32964induction
  • P1 E&O Clarification of Bodywork Rules #32468tyres & wheels
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • STL Single TB Weight Modifiers #31449weight
  • STL Improved Touring Tires #32063tyres & wheels
  • P1 Displacement & Weight Change Request for 2-Cycle 6 Cylinder #31609weight
  • STL Throttling Device Clarification #31323induction
  • STL Mazda Renesis Restriction #31467induction
  • STL Clarification of 79-85 RX7 Spec line #31621wording
Indianapolis Motor Speedway Runoffs 20212021-09-251:51.665Danny Steyn · fastest of 42 · top 5 within 1.7s-0.982s (-0.87%)2:02.711Joe Moser · fastest of 37 · top 5 within 3.2s+10.122s (+8.99%)131.8Max Gee1:29.011Lee Alexander · fastest of 13 · top 5 within 2.5s-1.783s (-1.96%)1:29.225Lee Alexander · fastest of 12 · top 5 within 3.5s-2.274s (-2.49%)160.1Jason Miller-33.486squal -22.654s72.7%qual 79.7%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-3.874squal +6.030s96.8%qual 105.4%
27 rule changes (STL: 15, P1: 11, SM: 1)7 engine · 6 weight · 3 induction · 2 aero · 2 suspension & brakes · 1 cars added · 1 tyres & wheels · 1 wording · 4 othershowhide
  • P1 Move 2000cc and 2300cc engine options to individual spec lines #31012engine
  • P1 E&O Spec Line B notes #31095weight
  • STL Request to clean up Spec MX-5 Redundancy #31069other
  • P1 Add 1355cc spec line #30890weight
  • STL VW Engine Request #30625engine
  • P1 E&O tonneau cover provision in cockpit opening section #30458other
  • P1 Update Spec Line B Notes #30498weight
  • P1 Update Spec Lines C and G notes #30499weight
  • P1 E&O Maximum Valves Per Cylinder #30559engine
  • STL Solstice Ride Height #30183suspension & brakes
  • STL Request Mazda B5 DOHC #30420cars added
  • STL Honda B16A (JDM) Restrictor change #30531induction
  • P1 Clean up Spec Line A notes section #30424engine
  • P1 Clean up Spec Line H notes section #30425engine
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • STL ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
  • P1 DP02 Sealed 2ltr Engine Option #30038engine
  • P1 E&O restrictor terminology #30285induction
  • STL GM Ecotec engines in STL #30247engine
  • STL Super Touring Alternate Miata Hubs #30345tyres & wheels
  • STL Brake Component Relocation #29990suspension & brakes
  • STL Super Touring Wing Clarification #30111aero
  • STL Transmission Options #30118other
  • STL Request for FWD and RWD Parity #29728weight
  • STL Request to Remove Honda F20C 2% Weight Penalty #29815weight
  • STL Request for FWD and RWD Parity #30023induction
  • STL Request clarification on wing measurement #29640aero
Road America Runoffs 20202020-10-022:31.420Danny Steyn · fastest of 33 · top 5 within 3.1s2:32.115Joe Moser · fastest of 30 · top 5 within 1.5s132.9Darin Treakle2:01.101James French · fastest of 18 · top 5 within 1.1s2:01.870James French · fastest of 17 · top 5 within 1.8s159.7David Locke-30.245squal -30.319s80.1%qual 80.0%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+11.633squal +10.789s107.6%qual 107.1%
17 rule changes (STL: 11, P1: 4, SM: 2)6 induction · 3 engine · 3 weight · 1 aero · 1 cars added · 1 suspension & brakes · 1 tyres & wheels · 1 wordingshowhide
  • SM Radiator E&O Clarifications #29294engine
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • STL Minimum Weight Determination #27695weight
  • STL ST Gurney flap Wicker clarification #29012aero
  • STL Request for Addition to GT3 Approved Turbo List #27576induction
  • STL Request to add 2016-2019 GMX-5 Spec line #28604cars added
  • STL Request to update PN for MX-5 #28622wording
  • STL Correction - Clarification Honda/Acura B18B engine Letter # 26209 #28873engine
  • P1 E&O minimum weights and intake manifolds #28731induction
  • STL STL Honda B18 restrictor changes #28794induction
  • STL Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0 #27884engine
  • STL Acura/Honda B18C engine chart. Reduce the current 54 mm flat plat #28663induction
  • STL Mazda MZR engine chart. Reduce the current 55 mm flat plate to 53 #28664induction
  • STL Request to add wheel part numbers #28342tyres & wheels
  • P1 Extend date for removing sealed DP02-spec 2.0L option #28046weight
  • P1 Remove sealed DP02-spec 2.0 MZR spec #26753induction
  • P1 Update Revised Spec Line F #27745weight
Virginia International Raceway Runoffs 20192019-10-052:07.203Danny Steyn · fastest of 36 · top 5 within 1.8s2:07.273Cliff Ira · fastest of 35 · top 5 within 1.4s134.8Cliff Ira1:42.674Todd Slusher · fastest of 14 · top 5 within 1.5s1:43.498Todd Slusher · fastest of 13 · top 5 within 1.0s155.9Jim Devenport-23.775squal -24.529s81.3%qual 80.7%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+9.186squal +7.349s107.2%qual 105.8%
29 rule changes (STL: 11, P1: 14, SM: 4)7 engine · 5 induction · 5 weight · 2 suspension & brakes · 2 tyres & wheels · 1 cars added · 1 removed · 4 wording · 2 othershowhide
  • STL Request to Classify Spec MX-5 Challenge in STL #27399cars added
  • P1 E&O Transmissions #27098other
  • P1 E&O Transmissions #27005tyres & wheels
  • P1 Move minimum height provision to #27031removed
  • P1 Remove duplicative fender louver provision #27033induction
  • STL Request clarification for manifold and throttle in STU #27004induction
  • P1 Missing word E&O #26919other
  • P1 E&O correction to GCR 9.1.8.C.C. #26927wording
  • STL Request Restrictor Plate correction #26779induction
  • P1 Clean up reference to engine table #26648engine
  • P1 Remove redundant spec line #26692engine
  • STL Request Ride Height Clarification #26597suspension & brakes
  • P1 Clean Up Engine Table Language #26590engine
  • P1 Move single-seat closed cockpit provision to #26376wording
  • SM Request to allow aftermarket fuel filters. #26370wording
  • STL Request to Allow VW 1.8L Engine #25614engine
  • STL Request to reduce weight of RX8 with Renesis rotary #25781weight -100 lbs
  • STL Request for Open Brake Pads On Mazda MX-5 Cup NC #25821suspension & brakes
  • STL Request to clarify B18C1 GSR Honda B motor table #26209weight
  • STL Port Matching #26415wording
  • P1 Correct errors in GCR section 9.1.8.C.J #26144engine
  • 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
  • P1 Remove redundant inlet restrictor provisions #25877induction
  • P1 Clarify Honda K20A-FD2 parts requirement #25949engine
  • P1 Correct GCR section 9.1.8.C.J errors #25966induction
  • STL Request to equalize FPR Reduction on all B-Series Vtec Engines #24746weight
  • STL Request E&O for Mazda Miata Spec Line #25955weight
Sonoma Raceway Runoffs 20182018-10-101:49.138Danny Steyn · fastest of 19 · top 5 within 2.5s1:49.754Danny Steyn · fastest of 17 · top 5 within 2.5s103.2Craig McHaffie1:27.714Todd Slusher · fastest of 19 · top 5 within 2.1s1:28.786Perry Richardson · fastest of 19 · top 5 within 0.9s144.0Johnnie Crean-20.968squal -21.424s80.9%qual 80.4%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+5.524squal +5.217s105.0%qual 104.8%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:52.647Adam Roberts · fastest of 57 · top 5 within 0.8s1:52.589Eric Kutil · fastest of 50 · top 5 within 1.2s1:30.794Jim Devenport · fastest of 19 · top 5 within 2.8s1:31.499Jim Devenport · fastest of 16 · top 5 within 2.2s-21.090squal -21.853s81.3%qual 80.6%1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s+6.511squal +5.659s105.8%qual 105.0%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:35.439John Schmitt · fastest of 34 · top 5 within 1.5s1:36.625Kevin Boehm · fastest of 31 · top 5 within 0.6s1:17.308James Devenport · fastest of 14 · top 5 within 2.7s1:19.407Gianpaolo Ciancimino · fastest of 13 · top 5 within 1.8s-17.218squal -18.131s82.2%qual 81.0%1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s+4.139squal +5.075s104.3%qual 105.3%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:09.672Kevin Boehm · fastest of 37 · top 5 within 2.5s2:10.269Kevin Boehm · fastest of 37 · top 5 within 2.1s1:49.219Jim Downing · fastest of 9 · top 5 within 2.2s1:49.792Gianpaolo Ciancimino · fastest of 10 · top 5 within 1.7s-20.477squal -20.453s84.3%qual 84.2%2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s+13.798squal +8.989s110.6%qual 106.9%

By track

TrackEvents Typical % of STL 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 STL'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.