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BoP Lab / Classes / STL

STL vs SM vs FV vs HP 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: remove one to add another)
ASB-SpecEPFAFCFE2FFFPvsFV×FXGT1GT2GTXvsHP×PP2vsSM×SMXSRF3STL×STUT1T2T3T4Show 51 inactive classes
Series
Reference · what % is measured against, 12 events
Tracks · untick to narrow

Closest to the field: STL 100.0% of STL Kevin Boehm, Daytona International Speedway Runoffs 2015 race · SM 96.8% of STL Brian Henderson, Indianapolis Motor Speedway Runoffs 2021 race · FV 95.5% of STL Alex Scaler, Indianapolis Motor Speedway Runoffs 2021 race · HP 94.7% of STL Steve Sargis, Indianapolis Motor Speedway Runoffs 2021 race

1:402:002:202:4031 rule changes between Runoffs 2018 and Runoffs 201931 ▾40 rule changes between Runoffs 2019 and Runoffs 202040 ▾37 rule changes between Runoffs 2020 and Runoffs 202137 ▾35 rule changes between Runoffs 2021 and Runoffs 202235 ▾10 rule changes between Runoffs 2022 and Runoffs 202310 ▾32 rule changes between Runoffs 2023 and Runoffs 202432 ▾24 rule changes between Runoffs 2024 and Runoffs 202524 ▾35 rule changes between Runoffs 2025 and Runoffs 202635 ▾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)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)FV race best at Runoffs 2015: 2:21.142 (Andrew Whitston)FV race best at Runoffs 2016: 1:38.066 (Flinn Lazier)FV race best at Runoffs 2017: 1:55.923 (Michael Varacins)FV race best at Runoffs 2018: 1:53.639 (Alex Scaler)FV race best at Runoffs 2019: 2:18.289 (Zachary Whitston)FV race best at Runoffs 2020: 2:45.816 (Alex Scaler)FV race best at Runoffs 2021: 1:57.234 (Alex Scaler)FV race best at Runoffs 2022: 2:18.093 (Andrew Whitston)FV race best at Runoffs 2023: 2:16.611 (Andrew Abbott)FV race best at Runoffs 2024: 2:44.834 (Andrew Abbott)FV race best at Runoffs 2025: 2:46.736 (Zachary Whitston)FV race best at Runoffs 2026: 2:45.272 (Brian Farnham)FV qualifying best at Runoffs 2015: 2:21.167 (Roger Siebenaler)FV qualifying best at Runoffs 2016: 1:37.942 (Alex Scaler)FV qualifying best at Runoffs 2017: 1:55.759 (Michael Varacins)FV qualifying best at Runoffs 2018: 1:52.637 (Skip Streets)FV qualifying best at Runoffs 2019: 2:15.712 (Andrew Whitston)FV qualifying best at Runoffs 2020: 2:43.994 (Hunter Phelps-Barron)FV qualifying best at Runoffs 2021: 1:57.479 (Andrew Whitston)FV qualifying best at Runoffs 2022: 2:15.116 (Brian Farnham)FV qualifying best at Runoffs 2023: 2:15.639 (Andrew Whitston)FV qualifying best at Runoffs 2024: 2:42.643 (Andrew Whitston)FV qualifying best at Runoffs 2025: 2:44.101 (Andrew Abbott)FV qualifying best at Runoffs 2026: 2:46.536 (Zachary Whitston)HP race best at Runoffs 2015: 2:17.981 (Alan (Aj) Hulse)HP race best at Runoffs 2016: 1:40.442 (Jason Isley)HP race best at Runoffs 2017: 1:57.569 (Vesa Silegren)HP race best at Runoffs 2018: 1:54.434 (Jason Isley)HP race best at Runoffs 2019: 2:15.062 (Ron Bartell)HP race best at Runoffs 2020: 2:47.444 (Steve Sargis)HP race best at Runoffs 2021: 1:56.188 (Steve Sargis)HP race best at Runoffs 2022: 2:11.803 (Vesa Silegren)HP race best at Runoffs 2023: 2:14.681 (Chris Schaafsma)HP race best at Runoffs 2024: 2:37.731 (Chuck Mathis)HP race best at Runoffs 2025: 2:38.270 (Steve Sargis)HP race best at Runoffs 2026: 2:38.036 (Steve Sargis)HP qualifying best at Runoffs 2015: 2:17.369 (Jason Isley)HP qualifying best at Runoffs 2016: 1:39.954 (Jason Isley)HP qualifying best at Runoffs 2017: 1:57.421 (Jason Isley)HP qualifying best at Runoffs 2018: 1:54.070 (Brian Linn)HP qualifying best at Runoffs 2019: 2:14.822 (Steve Sargis)HP qualifying best at Runoffs 2020: 2:39.695 (Daniel Meller)HP qualifying best at Runoffs 2021: 1:54.417 (Steve Sargis)HP qualifying best at Runoffs 2022: 2:13.952 (Steve Sargis)HP qualifying best at Runoffs 2023: 2:14.029 (Chris Schaafsma)HP qualifying best at Runoffs 2024: 2:38.445 (Chuck Mathis)HP qualifying best at Runoffs 2025: 2:38.785 (Steve Sargis)HP qualifying best at Runoffs 2026: 2:39.406 (Chris Schaafsma)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
STLSMFVHPsolid race · dashed qualifying · slower is lower
100%102%104%106%108%110%31 rule changes between Runoffs 2018 and Runoffs 201931 ▾40 rule changes between Runoffs 2019 and Runoffs 202040 ▾37 rule changes between Runoffs 2020 and Runoffs 202137 ▾35 rule changes between Runoffs 2021 and Runoffs 202235 ▾10 rule changes between Runoffs 2022 and Runoffs 202310 ▾32 rule changes between Runoffs 2023 and Runoffs 202432 ▾24 rule changes between Runoffs 2024 and Runoffs 202524 ▾35 rule changes between Runoffs 2025 and Runoffs 202635 ▾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)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)Off the chart: 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)FV race best at Runoffs 2015: 108.3% of STL's (Andrew Whitston)FV race best at Runoffs 2016: 101.5% of STL's (Flinn Lazier)FV race best at Runoffs 2017: 103.0% of STL's (Michael Varacins)FV race best at Runoffs 2018: 103.5% of STL's (Alex Scaler)FV race best at Runoffs 2019: 108.7% of STL's (Zachary Whitston)FV race best at Runoffs 2020: 109.0% of STL's (Alex Scaler)Off the chart: FV race best at Runoffs 2021: 95.5% of STL's (Alex Scaler)FV race best at Runoffs 2022: 108.0% of STL's (Andrew Whitston)FV race best at Runoffs 2023: 107.8% of STL's (Andrew Abbott)FV race best at Runoffs 2024: 109.7% of STL's (Andrew Abbott)FV race best at Runoffs 2025: 109.6% of STL's (Zachary Whitston)FV race best at Runoffs 2026: 109.7% of STL's (Brian Farnham)FV qualifying best at Runoffs 2015: 108.9% of STL's (Roger Siebenaler)FV qualifying best at Runoffs 2016: 102.6% of STL's (Alex Scaler)FV qualifying best at Runoffs 2017: 102.8% of STL's (Michael Varacins)FV qualifying best at Runoffs 2018: 103.2% of STL's (Skip Streets)FV qualifying best at Runoffs 2019: 106.7% of STL's (Andrew Whitston)FV qualifying best at Runoffs 2020: 108.3% of STL's (Hunter Phelps-Barron)FV qualifying best at Runoffs 2021: 105.2% of STL's (Andrew Whitston)FV qualifying best at Runoffs 2022: 107.7% of STL's (Brian Farnham)FV qualifying best at Runoffs 2023: 107.8% of STL's (Andrew Whitston)FV qualifying best at Runoffs 2024: 108.4% of STL's (Andrew Whitston)FV qualifying best at Runoffs 2025: 107.9% of STL's (Andrew Abbott)FV qualifying best at Runoffs 2026: 110.6% of STL's (Zachary Whitston)HP race best at Runoffs 2015: 105.9% of STL's (Alan (Aj) Hulse)HP race best at Runoffs 2016: 104.0% of STL's (Jason Isley)HP race best at Runoffs 2017: 104.4% of STL's (Vesa Silegren)HP race best at Runoffs 2018: 104.3% of STL's (Jason Isley)HP race best at Runoffs 2019: 106.1% of STL's (Ron Bartell)HP race best at Runoffs 2020: 110.1% of STL's (Steve Sargis)Off the chart: HP race best at Runoffs 2021: 94.7% of STL's (Steve Sargis)HP race best at Runoffs 2022: 103.1% of STL's (Vesa Silegren)HP race best at Runoffs 2023: 106.3% of STL's (Chris Schaafsma)HP race best at Runoffs 2024: 105.0% of STL's (Chuck Mathis)HP race best at Runoffs 2025: 104.0% of STL's (Steve Sargis)HP race best at Runoffs 2026: 104.9% of STL's (Steve Sargis)HP qualifying best at Runoffs 2015: 105.9% of STL's (Jason Isley)HP qualifying best at Runoffs 2016: 104.7% of STL's (Jason Isley)HP qualifying best at Runoffs 2017: 104.2% of STL's (Jason Isley)HP qualifying best at Runoffs 2018: 104.5% of STL's (Brian Linn)HP qualifying best at Runoffs 2019: 106.0% of STL's (Steve Sargis)HP qualifying best at Runoffs 2020: 105.5% of STL's (Daniel Meller)HP qualifying best at Runoffs 2021: 102.5% of STL's (Steve Sargis)HP qualifying best at Runoffs 2022: 106.8% of STL's (Steve Sargis)HP qualifying best at Runoffs 2023: 106.6% of STL's (Chris Schaafsma)HP qualifying best at Runoffs 2024: 105.6% of STL's (Chuck Mathis)HP qualifying best at Runoffs 2025: 104.4% of STL's (Steve Sargis)HP qualifying best at Runoffs 2026: 105.9% of STL's (Chris Schaafsma)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
STLSMFVHPsolid 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
EventSTLSMFVHP
Qual best Race best Trap Qual best Race best Trap vs STL % of STL 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%2:46.536Zachary Whitston · fastest of 37 · top 5 within 1.7s+2.435s (+1.48%)2:45.272Brian Farnham · fastest of 34 · top 5 within 1.3s-1.464s (-0.88%)117.4Rick Shields+0.2 mph (+0.1%)+14.615squal +15.999s109.7%qual 110.6%2:39.406Chris Schaafsma · fastest of 15 · top 5 within 7.7s+0.621s (+0.39%)2:38.036Steve Sargis · fastest of 11 · top 5 within 4.6s-0.234s (-0.15%)122.7Jesse Prather-2.2 mph (-1.8%)+7.379squal +8.869s104.9%qual 105.9%
35 rule changes (STL: 4, SM: 2, HP: 29)10 weight · 7 engine · 4 induction · 3 cars added · 3 tyres & wheels · 1 removed · 1 suspension & brakes · 4 wording · 2 othershowhide
  • HP Mini Cooper Compression Ratio #40517engine
  • HP 1996-2000 Honda Civic (CX, DX, VP, LX) with Engine Code D16Y7 #40322engine
  • HP 1275 Midget/Sprit Alternate intake manifold E/O #40370induction
  • HP HP Honda Civic (92-95) #40464weight -70 lbs
  • SM Rear Toe Link #40271other
  • STL Spec Line Clean Up #40344removed
  • HP Austin Healy Sprite/ MG Midget 1275 Induction Change Request #40213weight
  • STL Calculating Weight #40224weight
  • HP Miata track width - errors and omissions #39976wording
  • HP Triumph GT6 Spec Change. #40098induction
  • HP Request to Classify BMW E21 320i #40110cars added
  • HP BMW 318is 84-85 engine displacement correction #40116engine
  • SM Part Number Change Request #39914wording
  • STL Classifications #39885weight
  • HP Clarification On Oil Cooler Ducting #39604tyres & wheels
  • HP Honda Fit 2015-19 Error in Engine Classification #39853engine
  • HP Triumph Spitfire 1296cc Compression Ratio Increase to 12:1 #39589engine
  • HP E/O: Improve Consistency of the Spec Lines #39500other
  • HP Request to Reclassify BMW 2002 Into H Production #39567cars added
  • STL Weight adjustment for STL #39579weight
  • HP Request to Re-Classsify Datsun SPL-311 to HP from FP #39116cars added
  • HP TR2 Notes E&O #39180weight
  • HP Balance of Power #39187weight +50 lbs
  • HP Alternative BOP Request for 84-87 Honda CRX/Civic #39223tyres & wheels
  • HP Please Lower Weight of 280Z #38871weight -160 lbs
  • HP Miata Weight Adjustment Follow Up #38949weight -25 lbs
  • HP Weight Break for 1098 Midget / Sprite #38970weight -80 lbs
  • HP HP Volvo 142 spec omission #38994engine
  • HP HP Mini DOHC 1.6 #38996engine
  • HP Add to Rabbit description #39019wording
  • HP Clean-up 9.1.5.E.7e #39025suspension & brakes
  • HP Add TB size to Ford Mustang (94-98) Spec Line #39130induction
  • HP HP Plymouth Arrow spec omission #38995wording
  • HP Add Wheel Diameter to Appendix G #39008tyres & wheels
  • HP Add TB ID tolerance to general Prod rules #39009induction
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%2:44.101Andrew Abbott · fastest of 34 · top 5 within 1.3s+1.458s (+0.90%)2:46.736Zachary Whitston · fastest of 29 · top 5 within 0.6s+1.902s (+1.15%)117.2Zachary Whitston+0.7 mph (+0.6%)+14.609squal +12.036s109.6%qual 107.9%2:38.785Steve Sargis · fastest of 17 · top 5 within 1.9s+0.340s (+0.21%)2:38.270Steve Sargis · fastest of 14 · top 5 within 2.4s+0.539s (+0.34%)124.9Chris Schaafsma+2.1 mph (+1.7%)+6.143squal +6.720s104.0%qual 104.4%
24 rule changes (STL: 3, SM: 4, HP: 17)10 weight · 3 induction · 2 cars added · 2 tyres & wheels · 1 engine · 1 suspension & brakes · 1 wording · 4 othershowhide
  • STL Lotus Weight Reduction #38772weight -50 lbs
  • HP BMW Z4 update #38490induction
  • HP EP Fiat 124 Spider Competition Adjustment Request #38498weight -50 lbs
  • HP Base Weight Adjustment for H-Production X1/9 Spec Lines #38255weight -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
  • HP Request for Classification of Chevrolet Spark #37755cars added
  • HP Request to Lower Ford Festiva Minimum Weight to 1600 LBS #37939weight -100 lbs
  • HP Request Competition Adjustment to BMW Z3 2.5L #37120induction
  • HP HP Class Adjustments #37459weight +50 lbs
  • HP Interpretation of Production Rules on Mirrors #37235other
  • HP Weight Reduction for Honda S2000 #37466weight
  • HP Mazda 1999 Miata 1.8L #37488weight -50 lbs
  • HP MINI Cooper (07-13) Spec Line Correction: Errors and Omissions #37560engine
  • HP Effective date for Jan 2025 GCR updates #37654induction
  • HP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line #37119weight -50 lbs
  • HP Request to Update 1988-1991 Civic to Match 1988-1991 CRX #37444weight -70 lbs
  • HP MINI Cooper Spec Line Correction - Rear Brake Rotor Diameter #37176suspension & brakes
  • 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
  • HP 1275 HP Spridget Level 2 Only #36518other
  • HP Request for Classification of 1989-1994 Suzuki Swift GT 16V Twin #36858cars added
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%)2:41.106Ethan 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%2:42.643Andrew Whitston · fastest of 27 · top 5 within 2.3s-1.351s (-0.82%)2:44.834Andrew Abbott · fastest of 27 · top 5 within 0.9s-0.982s (-0.59%)116.5Brian Farnham-0.7 mph (-0.6%)+14.589squal +12.580s109.7%qual 108.4%2:38.445Chuck Mathis · fastest of 20 · top 5 within 3.4s-1.250s (-0.78%)2:37.731Chuck Mathis · fastest of 19 · top 5 within 2.3s-9.713s (-5.80%)122.8William Trainer-0.3 mph (-0.2%)+7.486squal +8.382s105.0%qual 105.6%
32 rule changes (STL: 4, SM: 4, FV: 2, HP: 22)12 weight · 5 engine · 3 induction · 2 cars added · 2 suspension & brakes · 1 tyres & wheels · 2 wording · 5 othershowhide
  • FV Disc Brakes #36822suspension & brakes
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • HP Errant entry in HP production line item #36231other
  • HP NIssan 300ZX Z31 to EP #35830cars added
  • HP RX7 1993 and Up Request In EP Spec Lines, classify #36031cars added
  • HP Clean-up Multiple EP RX-8 Spec Lines In EP #36156wording
  • HP Replace plastic panels #35875other
  • HP GCR Correction - Redundant HP Spec Lines #35623engine
  • HP Update 1988-1991 Civic to Match 1988-1991 CRX #35399weight
  • STL ST Electric-Assisted Steering Systems #35066other
  • STL BOP Adjustments #35112weight
  • STL Mazda 12A #35320induction
  • HP Request to Review Z3 2.5 Spec Line #35073weight +50 lbs
  • HP Parity in HP #35138other
  • HP Spitfire classification #35224engine
  • HP Miata Alternate Head #35253weight -50 lbs
  • HP Triumph GT6 Adjustments #35255weight
  • HP Honda S2000 throttle body #35272induction
  • HP Front Header/Nose Panel Alternate Material For 84-87 CRX #35301engine
  • HP Correction within Triumph TR8 Spec Line #35315engine
  • HP Correction to EP 924S/944 Spec Line #35317weight
  • HP Review Classification of HP Mazda 2 #35318weight +75 lbs
  • STL Alternate Carburetor Request for 79-85 RX7 12a #35181induction
  • FV FV Wheel Bearing Clarification #35150tyres & wheels
  • HP Request to Adjust Weight of 1988-1991 CRX/Civic #35115weight -70 lbs
  • HP Porsche 944/924S Rule Change Request #35002weight
  • HP FP and HP Toyota Corolla #35030weight -43 lbs
  • HP Weight Reduction for Mazda 626 #35031weight -100 lbs
  • HP Triumph GT6 Adjustments #35054weight -30 lbs
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%)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%2:15.639Andrew Whitston · fastest of 27 · top 5 within 1.4s+0.523s (+0.39%)2:16.611Andrew Abbott · fastest of 23 · top 5 within 1.6s-1.482s (-1.07%)115.6Brian Farnham-0.2 mph (-0.2%)+9.929squal +9.860s107.8%qual 107.8%2:14.029Chris Schaafsma · fastest of 25 · top 5 within 2.7s+0.077s (+0.06%)2:14.681Chris Schaafsma · fastest of 24 · top 5 within 2.5s+2.878s (+2.18%)119.4William Trainer-0.8 mph (-0.7%)+7.999squal +8.250s106.3%qual 106.6%
10 rule changes (STL: 2, SM: 1, HP: 7)3 induction · 3 weight · 2 tyres & wheels · 1 cars added · 1 othershowhide
  • HP Larger chokes #34681induction
  • HP Correct Intake Valve Size on 1500cc Midget/Spitfire #34419induction
  • HP ITC to FP? #34286other
  • HP Request to Classify Sonic and Fiesta in HP #34264cars added
  • STL Clarify STL table B - IT spec notes on Tires #34187tyres & wheels
  • HP MGB HP Weight Break and/or Hybrid 1/2 Prep in HP #33127weight
  • HP Datsun 510 Help #33568weight -50 lbs
  • HP Review Limited Prep Port Matching Rules #33600induction
  • SM BOP for NB1 and NB2 #32309weight
  • STL Spec MX5 in STL #33473tyres & wheels
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%)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%2:15.116Brian Farnham · fastest of 29 · top 5 within 1.1s-0.596s (-0.44%)2:18.093Andrew Whitston · fastest of 28 · top 5 within 1.2s-0.196s (-0.14%)115.8Jonathan Weisheit+1.1 mph (+0.9%)+10.261squal +9.642s108.0%qual 107.7%2:13.952Steve Sargis · fastest of 23 · top 5 within 3.9s-0.870s (-0.65%)2:11.803Vesa Silegren · fastest of 21 · top 5 within 6.3s-3.259s (-2.41%)120.2Chris Schaafsma-4.7 mph (-3.8%)+3.971squal +8.478s103.1%qual 106.8%
35 rule changes (STL: 5, SM: 1, FV: 4, HP: 25)10 weight · 8 induction · 5 cars added · 4 engine · 3 tyres & wheels · 1 suspension & brakes · 2 wording · 2 othershowhide
  • HP Request to classify VW New Beetle 2.5L in EP #32725cars added
  • HP Request Rotary Injection on Dual Y manifold #32775engine
  • HP Request for Corrado Stroke & Displacement Correction #32985engine
  • HP Subaru BRZ Model Years #32500other
  • HP EP MX-5 Global Cup Car #32218weight
  • HP Please Class BMW 128i in EP #32370cars added
  • HP Inconsistency in Body Work Descriptions #32396other
  • HP Mazda RX8 with 13b Rotary #32170induction
  • HP Request Idle control valve clarification #32178engine
  • HP Classify VW New Beetle in HP. #32241cars added
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • FV Connecting Rod Update Request for 9.1.1.C Formula Vee (FV) 5.C.6 #32160weight
  • FV E&O clarification of connecting rod center-to-center length #32183weight
  • HP Weight Change for Competition Adjustment #31182weight +45 lbs
  • HP EP Adjustments #31858induction
  • HP 1999 3.8L Ford Mustang to EP? #31635weight
  • HP Improved Touring Tires #32064tyres & wheels
  • STL Single TB Weight Modifiers #31449weight
  • STL Improved Touring Tires #32063tyres & wheels
  • HP Throttle Body and Idle Air #31800induction
  • HP Incorrect Valve Size Changes in Jan 2022 GCR for FIAT X1/9 #31990engine
  • FV Update direct replacement connecting rod information #31843weight
  • HP Porsche 968 Engine Questions #31478induction
  • HP PCS E. 2. n. 4. Add Axle Shaft to Allow FWD the Same Freedom #31592tyres & wheels
  • HP Weight Adjustment To Fiat X1/9 Spec Lines, H-Production #31653weight -50 lbs
  • HP 1500 Midget #31665cars added
  • HP BMW Z3 2.5L Spec Line #31724induction
  • HP Request weight requirement for 1500 MG Midget #31802weight
  • STL Throttling Device Clarification #31323induction
  • STL Mazda Renesis Restriction #31467induction
  • STL Clarification of 79-85 RX7 Spec line #31621wording
  • FV Formula V Connecting Rod Replacement #31448weight
  • HP 944S2 Restrictor #31396induction
  • HP Classing Clarification for 1986 Toyota Corolla FX16 #31527cars added
  • HP E&O; MR2 Track #31120wording
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 Gee1:57.695Brian 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%1:57.479Andrew Whitston · fastest of 48 · top 5 within 0.8s+1.720s (+1.49%)1:57.234Alex Scaler · fastest of 47 · top 5 within 1.0s+1.311s (+1.13%)124.0Mark Edwards-5.477squal +5.814s95.5%qual 105.2%1:54.417Steve Sargis · fastest of 42 · top 5 within 3.7s-3.004s (-2.56%)1:56.188Steve Sargis · fastest of 42 · top 5 within 2.9s-1.381s (-1.17%)122.0William Trainer-6.523squal +2.752s94.7%qual 102.5%
37 rule changes (STL: 15, SM: 1, HP: 21)9 cars added · 7 weight · 5 suspension & brakes · 4 engine · 4 induction · 2 aero · 1 tyres & wheels · 2 wording · 3 othershowhide
  • STL Request to clean up Spec MX-5 Redundancy #31069other
  • HP Request to Allow F22c Engine for 2000-2003 Honda S2000 #30548engine
  • HP Request a review of the S14 240SX in EP. #30873weight -200 lbs
  • HP Lotus/Caterham 7 America Request #30392engine
  • HP Request to classify ITC Plymouth Arrow #30588cars added
  • HP Reclassification of the 1984/85 BMW 318i from FP to HP #30661cars added
  • HP Reclassify Daimler SP 250 #30721cars added
  • HP 924 Brakes- and Thank You. #30614suspension & brakes
  • HP Clarify Application of Percentage Based Weight Penalties #30669weight
  • HP Correct Induction Error on new HP Mazda 626 Spec Line #30702induction
  • STL VW Engine Request #30625engine
  • HP Volvo 142 spec line complete. #29479cars added
  • HP Request to Classify 93-98 Volkswagen Golf to HP #29790cars added
  • HP Appeal of Request to Move Porsche 924 to HP #30132cars added
  • HP Change Classification of 84-87 Mazda 626 from FP to HP #30350cars added
  • HP Fiat X1/9 brake rotors #30423suspension & brakes
  • STL Solstice Ride Height #30183suspension & brakes
  • STL Request Mazda B5 DOHC #30420cars added
  • STL Honda B16A (JDM) Restrictor change #30531induction
  • HP Request to Classify 2012-2015 MINI Cooper Coupe in HP #30167cars added
  • HP Request clarification on VW 1.8 Rabbit GTI Spec Line #30368wording
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • STL ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
  • 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
  • HP Alternate Front Brake Rotors and Calipers for EP AH 3000 #29893suspension & brakes
  • 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
  • HP Mk2 VW Consistency and Cleanup of FP and HP Spec Lines #29195weight -50 lbs
  • HP Correct Wording for Level 1 and Level 2 Induction Systems #29406induction
  • HP Weight Reduction for Datsun Roadster #29409weight -75 lbs
  • HP EP TR8 Adjustment #29512weight -100 lbs
  • 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 Treakle2:42.209Kyle 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%2:43.994Hunter Phelps-Barron · fastest of 28 · top 5 within 0.6s2:45.816Alex Scaler · fastest of 24 · top 5 within 1.5s117.1Hunter Phelps-Barron+13.701squal +12.574s109.0%qual 108.3%2:39.695Daniel Meller · fastest of 19 · top 5 within 3.3s2:47.444Steve Sargis · fastest of 15 · top 5 within 6.1s123.1William Trainer+15.329squal +8.275s110.1%qual 105.5%
40 rule changes (STL: 11, SM: 2, FV: 6, HP: 21)8 engine · 8 induction · 8 tyres & wheels · 4 cars added · 3 weight · 2 suspension & brakes · 1 aero · 3 wording · 3 othershowhide
  • HP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O #29458tyres & wheels
  • SM Radiator E&O Clarifications #29294engine
  • HP EP BMW Z3 Rule Clarification #28998engine
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • STL Minimum Weight Determination #27695weight
  • STL ST Gurney flap Wicker clarification #29012aero
  • FV Support for Recommended Item - 4 bolt wheels in FV #29084tyres & wheels
  • FV Support for 4-bolt pattern wheels #28955 #29118tyres & wheels
  • HP Request to Classify Porsche 911 2.0L #28456cars added
  • HP Request Dual Carbs for 1.8 VW GTI Mk1 #28922engine
  • STL Request for Addition to GT3 Approved Turbo List #27576induction
  • HP BMW Cylinder Head Casting and Part Numbers #28708engine
  • 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
  • HP Request to Classify 1990-1994 Mazda Protege #28381cars added
  • HP Error in Mini Cooper Spec Line #28713wording
  • STL STL Honda B18 restrictor changes #28794induction
  • HP Caterham 7 Spec Line #28498engine
  • 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
  • FV Update rain tire designation #28444tyres & wheels
  • HP Letter #27917 #28085induction
  • HP Request to Classify 2007 - 2013 Mini Cooper Convertible #28111cars added
  • HP Allow HP Datsun 510 Under Level 2 to Utilize Datsun Z Brakes #28121suspension & brakes
  • HP Request to allow 40 DCOE carb for the Datsun 510 #28195induction
  • HP Request Ford Fiesta Weight Adjustment #28337weight
  • STL Request to add wheel part numbers #28342tyres & wheels
  • HP Request for Help for Datsun 1200 #27934induction
  • FV FV Allow non-spec tire in Regional competition #26284tyres & wheels
  • FV Request to Allow Rear Tires on the Front of Formula Vee #26537tyres & wheels
  • HP Update years for the Mazda2, Honda Fit, & Mini #27782other
  • HP Allow Dry Sump, Limited Prep Porsche 914 #27814other
  • HP Please Allow Alternate Rear Axle Housing for RWD Toyota Corolla #27854other
  • HP Request to List Mazda Miata Throttle Body Size #27907induction
  • HP HP VW Rabbit Convertible 1.6L #1922 and 32mm chokes #27917weight
  • FV Clarification on Wheel Bolt Pattern #27603tyres & wheels
  • HP Request to Correct Track of 1988-91 Honda Civic #27487wording
  • HP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661engine
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 Ira2:14.552Todd 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%2:15.712Andrew Whitston · fastest of 26 · top 5 within 1.5s2:18.289Zachary Whitston · fastest of 19 · top 5 within 0.4s114.8Roger Siebenaler+11.016squal +8.509s108.7%qual 106.7%2:14.822Steve Sargis · fastest of 29 · top 5 within 1.1s2:15.062Ron Bartell · fastest of 28 · top 5 within 1.2s124.9William Trainer+7.789squal +7.619s106.1%qual 106.0%
31 rule changes (STL: 11, SM: 4, FV: 6, HP: 10)6 weight · 5 induction · 4 suspension & brakes · 4 tyres & wheels · 2 cars added · 2 engine · 3 wording · 5 othershowhide
  • FV Allowed Modifications E&O #27398other
  • STL Request to Classify Spec MX-5 Challenge in STL #27399cars added
  • FV E&O Wheels #27230tyres & wheels
  • HP Request bodywork for Austin Healey Bugeye Sprite MK1 #27106other
  • HP Request to classify the GMX5 2019 #27263cars added
  • HP level one susp. component rule #27270suspension & brakes
  • HP Clarification of Carb Rules - Prep 1 #27300induction
  • HP Clarification of Carb Rules - Prep 2 #27301induction
  • HP Request Miata Eligibility - 2003 #27121other
  • STL Request clarification for manifold and throttle in STU #27004induction
  • FV Exhaust termination rule E&O #26702other
  • STL Request Restrictor Plate correction #26779induction
  • FV E&O Dimensions #26674other
  • STL Request Ride Height Clarification #26597suspension & brakes
  • FV Request to clarify Disc Brake rules bearing retainer & weights #26262suspension & brakes
  • HP Rollcenter Correction Clarification #25873tyres & wheels
  • HP Hardtops #26476wording
  • HP Do Something About the Toyota Yaris In H Production #25834weight +130 lbs
  • HP Request to Allow 2011+ Fiesta to Change Bolt Pattern on Wheels #25929tyres & wheels
  • 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
  • FV FV Intake Manifold Clarification #26008induction
  • 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
  • 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 McHaffie1:54.355Ken 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%1:52.637Skip Streets · fastest of 29 · top 5 within 1.6s1:53.639Alex Scaler · fastest of 28 · top 5 within 0.4s106.3Skip Streets+3.885squal +3.499s103.5%qual 103.2%1:54.070Brian Linn · fastest of 16 · top 5 within 2.8s1:54.434Jason Isley · fastest of 16 · top 5 within 3.3s109.3Michael H Miller+4.680squal +4.932s104.3%qual 104.5%
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 1.2s1:58.306Chris 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%1:55.759Michael Varacins · fastest of 39 · top 5 within 1.0s1:55.923Michael Varacins · fastest of 32 · top 5 within 1.3s+3.334squal +3.112s103.0%qual 102.8%1:57.421Jason Isley · fastest of 46 · top 5 within 0.9s1:57.569Vesa Silegren · fastest of 40 · top 5 within 1.1s+4.980squal +4.774s104.4%qual 104.2%
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 0.6s1:40.514Justin 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%1:37.942Alex Scaler · fastest of 41 · top 5 within 0.3s1:38.066Flinn Lazier · fastest of 38 · top 5 within 0.7s+1.441squal +2.503s101.5%qual 102.6%1:39.954Jason Isley · fastest of 34 · top 5 within 1.5s1:40.442Jason Isley · fastest of 34 · top 5 within 0.4s+3.817squal +4.515s104.0%qual 104.7%
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 2.1s2:18.661Andrew 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%2:21.167Roger Siebenaler · fastest of 31 · top 5 within 0.8s2:21.142Andrew Whitston · fastest of 30 · top 5 within 1.1s+10.873squal +11.495s108.3%qual 108.9%2:17.369Jason Isley · fastest of 18 · top 5 within 2.5s2:17.981Alan (Aj) Hulse · fastest of 17 · top 5 within 1.1s+7.712squal +7.697s105.9%qual 105.9%

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.