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BoP Lab / Classes / SM

SM vs F5 vs FV vs AS pace at every track

Lap times across years say as much about the weather as the class. % of SM is each class's best lap as a share of SM'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-SpecEPvsF5×FAFCFE2FFFPvsFV×FXGT1GT2GTXHPPP2SM×SMXSRF3STLSTUT1T2T3T4Show 50 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: SM 100.0% of SM Todd Lamb, Daytona International Speedway Runoffs 2015 race · F5 85.6% of SM Matthew Strand, Daytona International Speedway Runoffs 2015 race · FV 97.3% of SM Flinn Lazier, Mid-Ohio Sports Car Course Runoffs 2016 race · AS 85.3% of SM Andy McDermid, Daytona International Speedway Runoffs 2015 race

1:402:002:202:4015 rule changes between Runoffs 2018 and Runoffs 201915 ▾30 rule changes between Runoffs 2019 and Runoffs 202030 ▾18 rule changes between Runoffs 2020 and Runoffs 202118 ▾20 rule changes between Runoffs 2021 and Runoffs 202220 ▾5 rule changes between Runoffs 2022 and Runoffs 20235 ▾17 rule changes between Runoffs 2023 and Runoffs 202417 ▾15 rule changes between Runoffs 2024 and Runoffs 202515 ▾15 rule changes between Runoffs 2025 and Runoffs 202615 ▾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)F5 race best at Runoffs 2015: 2:03.298 (Matthew Strand)F5 race best at Runoffs 2016: 1:29.853 (Steven Thompson)F5 race best at Runoffs 2017: 1:42.860 (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 1:42.491 (David Lapham)F5 race best at Runoffs 2019: 1:57.572 (Wiley Mcmahan)F5 race best at Runoffs 2020: 2:21.391 (James Weida)F5 race best at Runoffs 2021: 1:43.140 (Sven de Vries)F5 race best at Runoffs 2022: 2:21.862 (Sven de Vries)F5 qualifying best at Runoffs 2015: 2:01.824 (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 1:28.528 (Calvin Stewart)F5 qualifying best at Runoffs 2017: 1:43.136 (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 1:41.807 (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 1:57.361 (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 2:20.954 (Calvin Stewart)F5 qualifying best at Runoffs 2021: 1:42.619 (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 1:57.689 (James Weida)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)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)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
SMF5FVASsolid race · dashed qualifying · slower is lower
85%90%95%100%15 rule changes between Runoffs 2018 and Runoffs 201915 ▾30 rule changes between Runoffs 2019 and Runoffs 202030 ▾18 rule changes between Runoffs 2020 and Runoffs 202118 ▾20 rule changes between Runoffs 2021 and Runoffs 202220 ▾5 rule changes between Runoffs 2022 and Runoffs 20235 ▾17 rule changes between Runoffs 2023 and Runoffs 202417 ▾15 rule changes between Runoffs 2024 and Runoffs 202515 ▾15 rule changes between Runoffs 2025 and Runoffs 202615 ▾SM race best at Runoffs 2015: 100.0% of SM's (Todd Lamb)SM race best at Runoffs 2016: 100.0% of SM's (Michael Carter)SM race best at Runoffs 2017: 100.0% of SM's (Michael Gagliardo)SM race best at Runoffs 2018: 100.0% of SM's (Michael Carter)SM race best at Runoffs 2019: 100.0% of SM's (Elivan Goulart)SM race best at Runoffs 2020: 100.0% of SM's (Preston Pardus)SM race best at Runoffs 2021: 100.0% of SM's (Brian Henderson)SM race best at Runoffs 2022: 100.0% of SM's (Travis Wiley)SM race best at Runoffs 2023: 100.0% of SM's (Julian DaCosta)SM race best at Runoffs 2024: 100.0% of SM's (Brett Kowalski)SM race best at Runoffs 2025: 100.0% of SM's (Kyle Greenhill)SM race best at Runoffs 2026: 100.0% of SM's (Francisco Barroso)SM qualifying best at Runoffs 2015: 100.0% of SM's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 100.0% of SM's (Justin Hille)SM qualifying best at Runoffs 2017: 100.0% of SM's (Chris Haldeman)SM qualifying best at Runoffs 2018: 100.0% of SM's (Ken Sutherland)SM qualifying best at Runoffs 2019: 100.0% of SM's (Todd Buras)SM qualifying best at Runoffs 2020: 100.0% of SM's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 100.0% of SM's (Brian Henderson)SM qualifying best at Runoffs 2022: 100.0% of SM's (Danny Steyn)SM qualifying best at Runoffs 2023: 100.0% of SM's (Danny Steyn)SM qualifying best at Runoffs 2024: 100.0% of SM's (Ethan Goulart)SM qualifying best at Runoffs 2025: 100.0% of SM's (Bobby Gossett)SM qualifying best at Runoffs 2026: 100.0% of SM's (Brett Kowalski)F5 race best at Runoffs 2015: 85.6% of SM's (Matthew Strand)F5 race best at Runoffs 2016: 89.2% of SM's (Steven Thompson)F5 race best at Runoffs 2017: 86.4% of SM's (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 88.9% of SM's (David Lapham)F5 race best at Runoffs 2019: 86.2% of SM's (Wiley Mcmahan)F5 race best at Runoffs 2020: 86.3% of SM's (James Weida)F5 race best at Runoffs 2021: 86.8% of SM's (Sven de Vries)F5 race best at Runoffs 2022: 102.0% of SM's (Sven de Vries)F5 qualifying best at Runoffs 2015: 87.9% of SM's (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 88.1% of SM's (Calvin Stewart)F5 qualifying best at Runoffs 2017: 87.2% of SM's (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 89.0% of SM's (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 87.2% of SM's (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 86.9% of SM's (Calvin Stewart)F5 qualifying best at Runoffs 2021: 87.2% of SM's (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 87.4% of SM's (James Weida)FV race best at Runoffs 2015: 98.0% of SM's (Andrew Whitston)FV race best at Runoffs 2016: 97.3% of SM's (Flinn Lazier)FV race best at Runoffs 2017: 97.3% of SM's (Michael Varacins)FV race best at Runoffs 2018: 98.6% of SM's (Alex Scaler)FV race best at Runoffs 2019: 101.3% of SM's (Zachary Whitston)FV race best at Runoffs 2020: 101.3% of SM's (Alex Scaler)FV race best at Runoffs 2021: 98.7% of SM's (Alex Scaler)FV race best at Runoffs 2022: 99.3% of SM's (Andrew Whitston)FV race best at Runoffs 2023: 100.3% of SM's (Andrew Abbott)FV race best at Runoffs 2024: 102.1% of SM's (Andrew Abbott)FV race best at Runoffs 2025: 101.4% of SM's (Zachary Whitston)FV race best at Runoffs 2026: 101.6% of SM's (Brian Farnham)FV qualifying best at Runoffs 2015: 101.8% of SM's (Roger Siebenaler)FV qualifying best at Runoffs 2016: 97.4% of SM's (Alex Scaler)FV qualifying best at Runoffs 2017: 97.8% of SM's (Michael Varacins)FV qualifying best at Runoffs 2018: 98.5% of SM's (Skip Streets)FV qualifying best at Runoffs 2019: 100.9% of SM's (Andrew Whitston)FV qualifying best at Runoffs 2020: 101.1% of SM's (Hunter Phelps-Barron)FV qualifying best at Runoffs 2021: 99.8% of SM's (Andrew Whitston)FV qualifying best at Runoffs 2022: 100.3% of SM's (Brian Farnham)FV qualifying best at Runoffs 2023: 100.5% of SM's (Andrew Whitston)FV qualifying best at Runoffs 2024: 101.0% of SM's (Andrew Whitston)FV qualifying best at Runoffs 2025: 100.6% of SM's (Andrew Abbott)FV qualifying best at Runoffs 2026: 102.7% of SM's (Zachary Whitston)AS race best at Runoffs 2015: 85.3% of SM's (Andy McDermid)AS race best at Runoffs 2016: 92.7% of SM's (Edward Hosni)AS race best at Runoffs 2017: 93.6% of SM's (Bryan Long)AS race best at Runoffs 2018: 95.7% of SM's (John Heinricy)AS race best at Runoffs 2019: 90.8% of SM's (James Jost)AS race best at Runoffs 2020: 90.2% of SM's (Gregory Eaton)AS race best at Runoffs 2021: 93.1% of SM's (Gregory Eaton)AS race best at Runoffs 2022: 89.6% of SM's (Gregory Eaton)AS race best at Runoffs 2023: 91.1% of SM's (Gregory Eaton)AS race best at Runoffs 2024: 90.7% of SM's (Gregory Eaton)AS race best at Runoffs 2025: 90.8% of SM's (Gregory Eaton)AS race best at Runoffs 2026: 91.2% of SM's (Andrew McDermid)AS qualifying best at Runoffs 2015: 87.8% of SM's (Tom Sloe)AS qualifying best at Runoffs 2016: 90.2% of SM's (Tom Sloe)AS qualifying best at Runoffs 2017: 88.9% of SM's (James Jost)AS qualifying best at Runoffs 2018: 94.3% of SM's (Andrew McDermid)AS qualifying best at Runoffs 2019: 91.4% of SM's (Gregory Eaton)AS qualifying best at Runoffs 2020: 90.7% of SM's (Gregory Eaton)AS qualifying best at Runoffs 2021: 93.8% of SM's (Drew Cattell)AS qualifying best at Runoffs 2022: 90.7% of SM's (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 91.2% of SM's (Daniel Richardson)AS qualifying best at Runoffs 2024: 91.0% of SM's (Gregory Eaton)AS qualifying best at Runoffs 2025: 90.0% of SM's (Andrew McDermid)AS qualifying best at Runoffs 2026: 90.6% of SM's (Andrew McDermid)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
SMF5FVASsolid race · dashed qualifying · each class's best lap as a share of SM's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventSMF5FVAS
Qual best Race best Trap Qual best Race best Trap vs SM % of SM Qual best Race best Trap vs SM % of SM Qual best Race best Trap vs SM % of SM 
Road America Runoffs 20262026-09-282:42.173Brett 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%)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%)+2.547squal +4.363s101.6%qual 102.7%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%)-14.254squal -15.262s91.2%qual 90.6%
15 rule changes (SM: 2, AS: 13)5 weight · 3 engine · 2 tyres & wheels · 1 induction · 1 removed · 1 wording · 2 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
  • SM Rear Toe Link #40271other
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • AS Header Information Update for EFI Engine Build Sheets #39886engine
  • AS Errors and Omissions #39933weight
  • SM Part Number Change Request #39914wording
  • AS Re-Organization of AS Spec lines for 2026 #39887removed
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • AS 1994 Mustang Spec Line Request #39104engine
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
Road America Runoffs 20252025-09-292:43.111Bobby 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%)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%)+2.306squal +0.990s101.4%qual 100.6%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%)-15.198squal -16.319s90.8%qual 90.0%
15 rule changes (SM: 4, AS: 11)5 engine · 3 weight · 2 induction · 1 tyres & wheels · 1 wording · 3 othershowhide
  • AS RE: Previous Letter 37695 Update #38245weight -75 lbs
  • 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
  • AS Flotek Head Plunge Cut Inconsistencies #37502other
  • AS Notes clean up #37693weight
  • AS Race memo #37902engine
  • 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
Road America Runoffs 20242024-10-012:41.106Ethan 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%)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%)+3.348squal +1.537s102.1%qual 101.0%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%)-15.057squal -14.528s90.7%qual 91.0%
17 rule changes (SM: 4, FV: 2, AS: 11)6 cars added · 2 engine · 2 suspension & brakes · 2 tyres & wheels · 1 wording · 4 othershowhide
  • FV Disc Brakes #36822suspension & brakes
  • 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
  • FV FV Wheel Bearing Clarification #35150tyres & wheels
Virginia International Raceway Runoffs 20232023-09-232:14.986Danny 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%)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%)+0.382squal +0.653s100.3%qual 100.5%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%)-12.109squal -11.904s91.1%qual 91.2%
5 rule changes (SM: 1, AS: 4)2 engine · 1 suspension & brakes · 1 tyres & wheels · 1 weightshowhide
  • 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
  • SM BOP for NB1 and NB2 #32309weight
Virginia International Raceway Runoffs 20222022-09-242:14.664Danny 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%)1:57.689James Weida · fastest of 11 · top 5 within 3.9s+0.328s (+0.28%)2:21.862Sven de Vries · fastest of 10 · top 5 within 14.3s+24.290s (+20.66%)142.9Calvin Stewart+0.1 mph (+0.1%)+2.755squal -16.975s102.0%qual 87.4%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%)-1.014squal +0.452s99.3%qual 100.3%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%)-14.529squal -12.502s89.6%qual 90.7%
20 rule changes (SM: 1, F5: 6, FV: 4, AS: 9)6 weight · 3 engine · 2 induction · 2 suspension & brakes · 2 wording · 5 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • F5 Intake Boots Correction #33028induction
  • F5 Ensure availability of ECU for Rotax engines #32695engine
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • F5 Clarify stepped exhaust header references #32743engine
  • F5 593 carb boot availability and oil pump clarification #32527induction
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • F5 E&O class name #32194other
  • 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
  • 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
  • F5 Data Box Mounting Plate #31638other
  • FV Update direct replacement connecting rod information #31843weight
  • FV Formula V Connecting Rod Replacement #31448weight
  • 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 20212021-09-251:57.695Brian 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 Greenhill1:42.619Ryan Mayfield · fastest of 22 · top 5 within 1.6s-0.517s (-0.50%)1:43.140Sven de Vries · fastest of 20 · top 5 within 1.7s+0.280s (+0.27%)144.4James Weida-15.697squal -15.076s86.8%qual 87.2%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-1.603squal -0.216s98.7%qual 99.8%1:50.427Drew 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-8.231squal -7.268s93.1%qual 93.8%
18 rule changes (SM: 1, F5: 3, AS: 14)6 weight · 4 engine · 3 cars added · 1 tyres & wheels · 3 wording · 1 othershowhide
  • F5 Clarify allowable assisted shifting systems #30871wording
  • F5 Request to correct terminology #30976tyres & wheels
  • 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
  • F5 Request to Allow Rotax 593 HO Engine #30712engine
  • SM Updates - Obsolete Parts & BOP Parts #30438other
  • 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
  • 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
  • AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine
  • AS Rule simplification spec line communization #29824weight
Road America Runoffs 20202020-10-022:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s121.3Kyle Greenhill2:20.954Calvin Stewart · fastest of 16 · top 5 within 1.8s2:21.391James Weida · fastest of 14 · top 5 within 1.5s143.2Aaron Ellis-22.357squal -21.255s86.3%qual 86.9%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+2.068squal +1.785s101.3%qual 101.1%2:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s149.2Gregory Eaton-16.080squal -15.164s90.2%qual 90.7%
30 rule changes (SM: 2, F5: 6, FV: 6, AS: 16)8 tyres & wheels · 6 engine · 3 induction · 3 suspension & brakes · 2 cars added · 2 weight · 1 aero · 5 othershowhide
  • F5 Request to Update Suzuki Engine Years for F500 #29453engine
  • 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
  • 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
  • F5 Request for Cockpit Adjustment of External Jetting Devices #28359other
  • F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine
  • F5 Re letter requesting driver adjustable carb mixture #28840other
  • F5 #28359 WDYT Request for Cockpit Adjustment #28875other
  • FV Support for Recommended Item - 4 bolt wheels in FV #29084tyres & wheels
  • FV Support for 4-bolt pattern wheels #28955 #29118tyres & wheels
  • AS weight adjustments for 2020 season #28785weight -50 lbs
  • FV Update rain tire designation #28444tyres & 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
  • F5 Change 600cc restrictor size #27883induction
  • 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
  • FV Clarification on Wheel Bolt Pattern #27603tyres & wheels
Virginia International Raceway Runoffs 20192019-10-052:14.552Todd Buras · fastest of 60 · top 5 within 0.2s2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s119.8Jim Drago1:57.361Wiley Mcmahan · fastest of 15 · top 5 within 3.8s1:57.572Wiley Mcmahan · fastest of 15 · top 5 within 4.0s142.8Eric McRee-18.887squal -17.191s86.2%qual 87.2%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+1.830squal +1.160s101.3%qual 100.9%2:02.938Gregory Eaton · fastest of 17 · top 5 within 0.8s2:03.900James Jost · fastest of 16 · top 5 within 2.1s153.9James Jost-12.559squal -11.614s90.8%qual 91.4%
15 rule changes (SM: 4, F5: 1, FV: 6, AS: 4)3 weight · 2 suspension & brakes · 2 tyres & wheels · 1 cars added · 1 engine · 1 induction · 1 wording · 4 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • FV Allowed Modifications E&O #27398other
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbs
  • FV E&O Wheels #27230tyres & wheels
  • AS Request Ride Height Clarification #26598suspension & brakes
  • AS Request to Revert to 2017 Weights #25885weight
  • FV Exhaust termination rule E&O #26702other
  • FV E&O Dimensions #26674other
  • FV Request to clarify Disc Brake rules bearing retainer & weights #26262suspension & brakes
  • SM Request to allow aftermarket fuel filters. #26370wording
  • AS SMG Mustang eligibility in American sedan #26224cars added
  • 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
Sonoma Raceway Runoffs 20182018-10-101:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s102.2Danny Steyn1:41.807Jeff Jorgenson · fastest of 5 · top 5 within 6.6s1:42.491David Lapham · fastest of 5 · top 5 within 9.5s113.3David Lapham-12.787squal -12.548s88.9%qual 89.0%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-1.639squal -1.718s98.6%qual 98.5%1:47.782Andrew McDermid · fastest of 12 · top 5 within 1.9s1:50.345John Heinricy · fastest of 10 · top 5 within 2.3s105.0Kevin Fandozzi-4.933squal -6.573s95.7%qual 94.3%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s1:43.136Wiley Clinton McMahan · fastest of 38 · top 5 within 1.4s1:42.860Wiley Clinton McMahan · fastest of 37 · top 5 within 1.6s-16.240squal -15.170s86.4%qual 87.2%1:55.759Michael Varacins · fastest of 39 · top 5 within 1.0s1:55.923Michael Varacins · fastest of 32 · top 5 within 1.3s-3.177squal -2.547s97.3%qual 97.8%1:45.220James Jost · fastest of 29 · top 5 within 6.7s1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s-7.593squal -13.086s93.6%qual 88.9%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s1:28.528Calvin Stewart · fastest of 14 · top 5 within 3.9s1:29.853Steven Thompson · fastest of 12 · top 5 within 4.5s-10.911squal -11.986s89.2%qual 88.1%1:37.942Alex Scaler · fastest of 41 · top 5 within 0.3s1:38.066Flinn Lazier · fastest of 38 · top 5 within 0.7s-2.698squal -2.572s97.3%qual 97.4%1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s-7.340squal -9.863s92.7%qual 90.2%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s2:01.824W. Clint McMahan · fastest of 16 · top 5 within 3.0s2:03.298Matthew Strand · fastest of 15 · top 5 within 4.9s-20.769squal -16.837s85.6%qual 87.9%2:21.167Roger Siebenaler · fastest of 31 · top 5 within 0.8s2:21.142Andrew Whitston · fastest of 30 · top 5 within 1.1s-2.925squal +2.506s98.0%qual 101.8%2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s-21.145squal -16.915s85.3%qual 87.8%

By track

TrackEvents Typical % of SM 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 SM'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.