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BoP Lab / Classes / STL

STL vs AS vs SM vs FA 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)
vsAS×B-SpecEPvsFA×FCFE2FFFPFVFXGT1GT2GTXHPPP2vsSM×SMXSRF3STL×STUT1T2T3T4Show 51 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 · AS 90.1% of STL Gregory Eaton, Indianapolis Motor Speedway Runoffs 2021 race · SM 96.8% of STL Brian Henderson, Indianapolis Motor Speedway Runoffs 2021 race · FA 73.9% of STL James French, Indianapolis Motor Speedway Runoffs 2021 race

1:402:002:202:4026 rule changes between Runoffs 2018 and Runoffs 201926 ▾44 rule changes between Runoffs 2019 and Runoffs 202044 ▾52 rule changes between Runoffs 2020 and Runoffs 202152 ▾22 rule changes between Runoffs 2021 and Runoffs 202222 ▾14 rule changes between Runoffs 2022 and Runoffs 202314 ▾19 rule changes between Runoffs 2023 and Runoffs 202419 ▾21 rule changes between Runoffs 2024 and Runoffs 202521 ▾26 rule changes between Runoffs 2025 and Runoffs 202626 ▾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)AS race best at Runoffs 2015: 2:02.922 (Andy McDermid)AS race best at Runoffs 2016: 1:33.424 (Edward Hosni)AS race best at Runoffs 2017: 1:51.507 (Bryan Long)AS race best at Runoffs 2018: 1:50.345 (John Heinricy)AS race best at Runoffs 2019: 2:03.900 (James Jost)AS race best at Runoffs 2020: 2:27.668 (Gregory Eaton)AS race best at Runoffs 2021: 1:50.606 (Gregory Eaton)AS race best at Runoffs 2022: 2:04.578 (Gregory Eaton)AS race best at Runoffs 2023: 2:04.120 (Gregory Eaton)AS race best at Runoffs 2024: 2:26.429 (Gregory Eaton)AS race best at Runoffs 2025: 2:29.232 (Gregory Eaton)AS race best at Runoffs 2026: 2:28.471 (Andrew McDermid)AS qualifying best at Runoffs 2015: 2:01.746 (Tom Sloe)AS qualifying best at Runoffs 2016: 1:30.651 (Tom Sloe)AS qualifying best at Runoffs 2017: 1:45.220 (James Jost)AS qualifying best at Runoffs 2018: 1:47.782 (Andrew McDermid)AS qualifying best at Runoffs 2019: 2:02.938 (Gregory Eaton)AS qualifying best at Runoffs 2020: 2:27.045 (Gregory Eaton)AS qualifying best at Runoffs 2021: 1:50.427 (Drew Cattell)AS qualifying best at Runoffs 2022: 2:02.162 (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 2:03.082 (Daniel Richardson)AS qualifying best at Runoffs 2024: 2:26.578 (Gregory Eaton)AS qualifying best at Runoffs 2025: 2:26.792 (Andrew McDermid)AS qualifying best at Runoffs 2026: 2:26.911 (Andrew McDermid)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)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)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
STLASSMFAsolid race · dashed qualifying · slower is lower
80%90%100%110%26 rule changes between Runoffs 2018 and Runoffs 201926 ▾44 rule changes between Runoffs 2019 and Runoffs 202044 ▾52 rule changes between Runoffs 2020 and Runoffs 202152 ▾22 rule changes between Runoffs 2021 and Runoffs 202222 ▾14 rule changes between Runoffs 2022 and Runoffs 202314 ▾19 rule changes between Runoffs 2023 and Runoffs 202419 ▾21 rule changes between Runoffs 2024 and Runoffs 202521 ▾26 rule changes between Runoffs 2025 and Runoffs 202626 ▾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)AS race best at Runoffs 2015: 94.4% of STL's (Andy McDermid)AS race best at Runoffs 2016: 96.7% of STL's (Edward Hosni)AS race best at Runoffs 2017: 99.0% of STL's (Bryan Long)AS race best at Runoffs 2018: 100.5% of STL's (John Heinricy)AS race best at Runoffs 2019: 97.3% of STL's (James Jost)AS race best at Runoffs 2020: 97.1% of STL's (Gregory Eaton)AS race best at Runoffs 2021: 90.1% of STL's (Gregory Eaton)AS race best at Runoffs 2022: 97.5% of STL's (Gregory Eaton)AS race best at Runoffs 2023: 98.0% of STL's (Gregory Eaton)AS race best at Runoffs 2024: 97.5% of STL's (Gregory Eaton)AS race best at Runoffs 2025: 98.1% of STL's (Gregory Eaton)AS race best at Runoffs 2026: 98.5% of STL's (Andrew McDermid)AS qualifying best at Runoffs 2015: 93.9% of STL's (Tom Sloe)AS qualifying best at Runoffs 2016: 95.0% of STL's (Tom Sloe)AS qualifying best at Runoffs 2017: 93.4% of STL's (James Jost)AS qualifying best at Runoffs 2018: 98.8% of STL's (Andrew McDermid)AS qualifying best at Runoffs 2019: 96.6% of STL's (Gregory Eaton)AS qualifying best at Runoffs 2020: 97.1% of STL's (Gregory Eaton)AS qualifying best at Runoffs 2021: 98.9% of STL's (Drew Cattell)AS qualifying best at Runoffs 2022: 97.4% of STL's (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 97.9% of STL's (Daniel Richardson)AS qualifying best at Runoffs 2024: 97.7% of STL's (Gregory Eaton)AS qualifying best at Runoffs 2025: 96.5% of STL's (Andrew McDermid)AS qualifying best at Runoffs 2026: 97.6% of STL's (Andrew McDermid)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)FA race best at Runoffs 2015: 83.0% of STL's (Tyler Hunter)FA race best at Runoffs 2016: 81.8% of STL's (Ryan Norman)FA race best at Runoffs 2017: 81.1% of STL's (Keith Grant)FA race best at Runoffs 2018: 81.9% of STL's (Mirl Swan)FA race best at Runoffs 2019: 81.0% of STL's (Dario Cangialosi)FA race best at Runoffs 2020: 82.0% of STL's (Spencer Brockman)Off the chart: FA race best at Runoffs 2021: 73.9% of STL's (James French)FA race best at Runoffs 2022: 84.9% of STL's (Alex Mayer)FA race best at Runoffs 2024: 81.1% of STL's (Dudley Fleck)FA race best at Runoffs 2025: 80.6% of STL's (Hans Peter)FA race best at Runoffs 2026: 81.9% of STL's (James French)FA qualifying best at Runoffs 2015: 83.1% of STL's (Tyler Hunter)FA qualifying best at Runoffs 2016: 78.5% of STL's (Ryan Norman)FA qualifying best at Runoffs 2017: 79.9% of STL's (Sedat Yelkin)FA qualifying best at Runoffs 2018: 80.8% of STL's (Mirl Swan)FA qualifying best at Runoffs 2019: 79.8% of STL's (Dario Cangialosi)FA qualifying best at Runoffs 2020: 82.1% of STL's (Spencer Brockman)FA qualifying best at Runoffs 2021: 80.3% of STL's (James French)FA qualifying best at Runoffs 2022: 83.4% of STL's (Chip Romer)FA qualifying best at Runoffs 2024: 81.0% of STL's (Hans Peter)FA qualifying best at Runoffs 2025: 79.5% of STL's (Hans Peter)FA qualifying best at Runoffs 2026: 81.4% of STL's (Dudley Fleck)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
STLASSMFAsolid 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
EventSTLASSMFA
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%)2:26.911Andrew McDermid · fastest of 8 · top 5 within 3.4s+0.119s (+0.08%)2:28.471Andrew McDermid · fastest of 8 · top 5 within 2.4s-0.761s (-0.51%)151.0Andrew McDermid-0.6 mph (-0.4%)-2.186squal -3.626s98.5%qual 97.6%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%2:02.513Dudley 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%)-27.323squal -28.024s81.9%qual 81.4%
26 rule changes (STL: 4, AS: 13, SM: 2, FA: 7)9 weight · 5 engine · 4 induction · 2 removed · 2 tyres & wheels · 1 wording · 3 othershowhide
  • AS 2016+ Camaro Spec Line Full Prep #39646tyres & wheels
  • AS Consideration of Pirelli P Zero Trofeo Track for AS Competition #40495tyres & wheels
  • AS Change in 9.1.6.D.4.d.5 in Suspension Mounting Points #40094other
  • AS Re-Add 4.6L 4v 96-04 Mustang Cobra #40239weight
  • AS Errors and Omissions #40532weight
  • FA Update sealed engine teardown section #40621engine
  • SM Rear Toe Link #40271other
  • STL Spec Line Clean Up #40344removed
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • FA Motor Classification #40175weight
  • STL Calculating Weight #40224weight
  • AS Header Information Update for EFI Engine Build Sheets #39886engine
  • AS Errors and Omissions #39933weight
  • SM Part Number Change Request #39914wording
  • STL Classifications #39885weight
  • AS Re-Organization of AS Spec lines for 2026 #39887removed
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • FA Pro Mazda Classification and Performance Enhancement Proposal #39411induction
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • FA Alternate Intake Manifold for MZR #38223induction
  • FA Engine Compression Rule Change Request #39302engine
  • FA Change Formula 1000 allowances #39608induction
  • STL Weight adjustment for STL #39579weight
  • AS 1994 Mustang Spec Line Request #39104engine
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
  • FA Re-Consider USF Pro 2000 Car for Formula Atlantic Class #38783other
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%)2:26.792Andrew McDermid · fastest of 11 · top 5 within 3.9s+0.214s (+0.15%)2:29.232Gregory Eaton · fastest of 10 · top 5 within 4.0s+2.803s (+1.91%)151.5Andrew McDermid+1.9 mph (+1.3%)-2.895squal -5.273s98.1%qual 96.5%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%2:00.923Hans 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%)-29.473squal -31.142s80.6%qual 79.5%
21 rule changes (STL: 3, AS: 11, SM: 4, FA: 3)5 engine · 5 weight · 4 tyres & wheels · 2 induction · 1 cars added · 1 wording · 3 othershowhide
  • STL Lotus Weight Reduction #38772weight -50 lbs
  • AS RE: Previous Letter 37695 Update #38245weight -75 lbs
  • FA Ligier JS F3 Tire Choice #38434tyres & wheels
  • AS Errors and Omissions #38234engine
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • AS Errors and Omission #38055induction
  • AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO #38197engine
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • STL E&O: SMX Allowance in STL #37945weight
  • AS Flotek Head Plunge Cut Inconsistencies #37502other
  • AS Notes clean up #37693weight
  • AS Race memo #37902engine
  • FA Update Formula Renault 2.0 spec line notes #37853tyres & wheels
  • FA Classify FR European Championship car as spec line car in Table 2 #37658cars added
  • AS Increase Coyote Engine Restrictor to 80mm #36177induction
  • AS Performance Pack for 2015+ Mustang #36867weight
  • AS Gear Ratios #37131engine
  • AS ECU specs for LS engine #37208engine
  • 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%)2:26.578Gregory Eaton · fastest of 18 · top 5 within 2.6s-0.467s (-0.32%)2:26.429Gregory Eaton · fastest of 18 · top 5 within 2.5s-1.239s (-0.84%)149.6Gregory Eaton+0.4 mph (+0.3%)-3.816squal -3.485s97.5%qual 97.7%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%2:01.560Hans 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%)-28.455squal -28.503s81.1%qual 81.0%
19 rule changes (STL: 4, AS: 11, SM: 4)6 cars added · 2 engine · 2 induction · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 1 wording · 5 othershowhide
  • AS Mustang transmission ratios #36662engine
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • AS Request for Classification of 2018-2023 mustang In #35764cars added
  • AS 6th gen Camaro limited prep #35733cars added
  • AS Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V8 LS1 Alum BLK #35825cars added
  • AS Full Prep Head #35891other
  • AS Restricted Prep Aftermarket Parts Request #35682other
  • AS Allowance of 11 #35824tyres & wheels
  • AS Request to Classify 1970-1981 Camaro and Firebird in AS #33659cars added
  • AS Fuel Cell 12 #34194other
  • AS Please Classify the 6th Gen Into AS. #35448cars added
  • AS spec lines #35713cars added
  • STL ST Electric-Assisted Steering Systems #35066other
  • STL BOP Adjustments #35112weight
  • STL Mazda 12A #35320induction
  • 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%)2:03.082Daniel Richardson · fastest of 11 · top 5 within 2.2s+0.920s (+0.75%)2:04.120Gregory Eaton · fastest of 9 · top 5 within 3.0s-0.458s (-0.37%)154.6James Jost+3.7 mph (+2.5%)-2.562squal -2.697s98.0%qual 97.9%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%
14 rule changes (STL: 2, AS: 4, SM: 1, FA: 7)5 tyres & wheels · 3 engine · 2 induction · 2 weight · 1 suspension & brakes · 1 othershowhide
  • AS Crate Motor Part Numbers #32944engine
  • AS Request wheel size change #33007tyres & wheels
  • AS Alternative Upper Front Control Arms for Dodge Challenger #33352engine
  • AS Front Brake Caliper Adapters for Dodge Challenger #33353suspension & brakes
  • FA Simplify Pro Formula Mazda wheel allowance #34190tyres & wheels
  • STL Clarify STL table B - IT spec notes on Tires #34187tyres & 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
  • FA BDA Displacement #33431engine
  • SM BOP for NB1 and NB2 #32309weight
  • STL Spec MX5 in STL #33473tyres & wheels
  • 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 20222022-09-242:05.474Danny 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%)2:02.162Kurt Rezzetano · fastest of 13 · top 5 within 2.3s-0.776s (-0.63%)2:04.578Gregory Eaton · fastest of 11 · top 5 within 2.9s+0.678s (+0.55%)150.9James Jost-3.0 mph (-2.0%)-3.254squal -3.312s97.5%qual 97.4%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%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%)-19.325squal -20.771s84.9%qual 83.4%
22 rule changes (STL: 5, AS: 9, SM: 1, FA: 7)4 engine · 4 weight · 2 induction · 2 suspension & brakes · 2 tyres & wheels · 1 aero · 3 wording · 4 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • 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
  • 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
  • FA Closing the Gap #31934other
  • STL Single TB Weight Modifiers #31449weight
  • STL Improved Touring Tires #32063tyres & wheels
  • FA Reorganize Tables 1 and 2 #31985weight
  • AS Proposed Revisions to SCCA GCR 2021 Appendix M, Part 3 #30295other
  • AS specification line consolidation and correction #31846wording
  • AS correction of SMG specification line #31847suspension & brakes
  • AS Alternate cylinder heads for full prep engine builds - Evaluation #31851engine
  • STL Throttling Device Clarification #31323induction
  • STL Mazda Renesis Restriction #31467induction
  • STL Clarification of 79-85 RX7 Spec line #31621wording
  • AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other
  • AS Request Pontiac GTO tire size change #30881weight
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 Gee1:50.427Drew Cattell · fastest of 31 · top 5 within 1.9s+5.207s (+4.95%)1:50.606Gregory Eaton · fastest of 28 · top 5 within 1.7s-0.901s (-0.81%)153.8James Jost-12.105squal -1.238s90.1%qual 98.9%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%1:29.701James 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-32.061squal -21.964s73.9%qual 80.3%
52 rule changes (STL: 15, AS: 14, SM: 1, FA: 22)14 weight · 11 engine · 5 cars added · 4 induction · 2 aero · 2 removed · 2 suspension & brakes · 2 tyres & wheels · 4 wording · 6 othershowhide
  • FA E&O Table 2 engine names #31085engine
  • STL Request to clean up Spec MX-5 Redundancy #31069other
  • 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
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • AS Request to consolidate SN95 Mustang '94-'04 Mustang spec lines #30428cars added
  • AS American Sedan Transmission Rule Change Request #30595weight
  • AS Correction to specifications inadvertently deleted #30691wording
  • AS weight adjustments #30700weight +50 lbs
  • FA E&O Mazda MZR 2.0 and Honda Civic K20Z3 chassis eligibility #30632other
  • STL VW Engine Request #30625engine
  • 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
  • STL Solstice Ride Height #30183suspension & brakes
  • STL Request Mazda B5 DOHC #30420cars added
  • STL Honda B16A (JDM) Restrictor change #30531induction
  • 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
  • STL ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
  • AS AS Mustang LP 4.6 3V Classification Transmission Request #29886weight
  • AS Request CF driveshaft on CTS-V for durability improvement #30117engine
  • AS Adjustment to model years of 5th generation RP Camaro #30348engine
  • 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
  • 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
  • AS Request for 2015 -2017 Ford Mustang Spec Line #29514cars added
  • AS Request Trunk lid / Rear Hatch clarification #29591wording
  • AS Common Weight for CTS-V Tire #29759weight
  • AS Correction to specifications inadvertently deleted #30041cars added
  • FA Request to classify Formula Lites Crawford FL15 #29702cars added
  • 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
  • AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine
  • AS Rule simplification spec line communization #29824weight
  • 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 Treakle2:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s149.2Gregory Eaton-4.447squal -4.375s97.1%qual 97.1%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%2:04.274Spencer Brockman · fastest of 11 · top 5 within 2.7s2:04.746Spencer Brockman · fastest of 10 · top 5 within 2.4s150.6Hans Peter-27.369squal -27.146s82.0%qual 82.1%
44 rule changes (STL: 11, AS: 16, SM: 2, FA: 15)10 engine · 8 induction · 5 tyres & wheels · 5 weight · 3 aero · 3 cars added · 3 suspension & brakes · 1 removed · 1 wording · 5 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • AS Dodge Challenger AS Spec Line Clarification #28698induction
  • AS Dodge Challenger AS Spec Line Clarification #2 #28699aero
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • STL Minimum Weight Determination #27695weight
  • STL ST Gurney flap Wicker clarification #29012aero
  • AS Support for R-Type Specification Tires #27450tyres & wheels
  • AS Spec Tire Request #27519tyres & wheels
  • AS Restrictor Plate Change for RP 2011+ Mustang with Coyote Engine #27675induction
  • AS 2005-2009 Restricted Prep 4.6 3V #27908engine
  • AS Request for 2005-2009 Restricted Prep 4.6 3V Parts #27909engine
  • AS Request for Full Preparation Classification for 2010-2014 Camaro #28030other
  • AS Cylinder Heads #28696engine
  • AS Request for Max Rotor Diameter Change #28748suspension & brakes
  • AS Request increase rotor diameter #28797other
  • FA Request to Adjust FB Weight for Stock Engines #29005weight
  • STL Request for Addition to GT3 Approved Turbo List #27576induction
  • FA E&O permitted engine modifications #28831engine
  • FA E&O Transmissions #28832other
  • FA Swift 016 Gurney flap wicker clarification #28884aero
  • 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
  • AS weight adjustments for 2020 season #28785weight -50 lbs
  • FA Remove redundant spec line in Table 1 #28720removed
  • FA E&O general engine rules #28772engine
  • STL STL Honda B18 restrictor changes #28794induction
  • 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
  • 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
  • FA FA weight correction/clarification #28430engine
  • STL Request to add wheel part numbers #28342tyres & wheels
  • AS Rear Trailing Arms #28007suspension & brakes
  • AS Weight reduction for cars running iron heads #28010weight
  • AS 05-10 Mustang with HR cam classification #28226cars added
  • AS 10-15 Camaro Full Prep classification #28227cars added
  • 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
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 Ira2:02.938Gregory Eaton · fastest of 17 · top 5 within 0.8s2:03.900James Jost · fastest of 16 · top 5 within 2.1s153.9James Jost-3.373squal -4.265s97.3%qual 96.6%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%1:41.545Dario Cangialosi · fastest of 8 · top 5 within 2.8s1:43.107Dario Cangialosi · fastest of 8 · top 5 within 1.8s155.9Kent Vaccaro-24.166squal -25.658s81.0%qual 79.8%
26 rule changes (STL: 11, AS: 4, SM: 4, FA: 7)9 weight · 4 engine · 3 suspension & brakes · 2 cars added · 2 induction · 1 removed · 1 tyres & wheels · 2 wording · 2 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • FA Follow up to Letter #27344 on Honda Powered FA Rules #27363removed
  • STL Request to Classify Spec MX-5 Challenge in STL #27399cars added
  • FA Swift 014 Mazda MZR 2.0 E&O #27305weight
  • AS Request Ride Height Clarification #26598suspension & brakes
  • STL Request clarification for manifold and throttle in STU #27004induction
  • AS Request to Revert to 2017 Weights #25885weight
  • FA Adjust Line N restrictor size and minimum weight #26691weight +30 lbs
  • STL Request Restrictor Plate correction #26779induction
  • FA Add data plate requirement #26707other
  • STL Request Ride Height Clarification #26597suspension & brakes
  • FA Request to add FA engine spec lines #26183engine
  • 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
  • AS SMG Mustang eligibility in American sedan #26224cars added
  • 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
  • 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 McHaffie1:47.782Andrew McDermid · fastest of 12 · top 5 within 1.9s1:50.345John Heinricy · fastest of 10 · top 5 within 2.3s105.0Kevin Fandozzi+0.591squal -1.356s100.5%qual 98.8%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%1:28.176Mirl Swan · fastest of 7 · top 5 within 4.0s1:29.924Mirl Swan · fastest of 7 · top 5 within 2.6s144.8Antony Opheim-19.830squal -20.962s81.9%qual 80.8%
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 1.2s1:45.220James Jost · fastest of 29 · top 5 within 6.7s1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s-1.082squal -7.427s99.0%qual 93.4%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%1:29.957Sedat Yelkin · fastest of 12 · top 5 within 2.3s1:31.365Keith Grant · fastest of 12 · top 5 within 1.0s-21.224squal -22.690s81.1%qual 79.9%
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 0.6s1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s-3.201squal -4.788s96.7%qual 95.0%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%1:14.920Ryan Norman · fastest of 5 · top 5 within 7.0s1:19.009Ryan Norman · fastest of 5 · top 5 within 4.7s-17.616squal -20.519s81.8%qual 78.5%
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 2.1s2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s-7.347squal -7.926s94.4%qual 93.9%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%1:47.758Tyler Hunter · fastest of 10 · top 5 within 3.7s1:48.162Tyler Hunter · fastest of 8 · top 5 within 5.3s-22.107squal -21.914s83.0%qual 83.1%

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.