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BoP Lab / Classes / AS

AS vs FE2 vs GT3 vs SM pace at every track

Lap times across years say as much about the weather as the class. % of AS is each class's best lap as a share of AS'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)
AS×B-SpecEPFAFCvsFE2×FFFPFVFXGT1GT2vsGT3×GTXHPPP2vsSM×SMXSRF3STLSTUT1T2T3T4Show 58 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: AS 100.0% of AS Andy McDermid, Daytona International Speedway Runoffs 2015 race · FE2 86.6% of AS Flinn Lazier, Sonoma Raceway Runoffs 2018 race · GT3 93.0% of AS Michael Lewis, Sonoma Raceway Runoffs 2018 race · SM 104.5% of AS Michael Carter, Sonoma Raceway Runoffs 2018 race

1:402:002:202:4016 rule changes between Runoffs 2018 and Runoffs 201916 ▾37 rule changes between Runoffs 2019 and Runoffs 202037 ▾21 rule changes between Runoffs 2020 and Runoffs 202121 ▾27 rule changes between Runoffs 2021 and Runoffs 202227 ▾15 rule changes between Runoffs 2022 and Runoffs 202315 ▾45 rule changes between Runoffs 2023 and Runoffs 202445 ▾25 rule changes between Runoffs 2024 and Runoffs 202525 ▾18 rule changes between Runoffs 2025 and Runoffs 202618 ▾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)FE2 race best at Runoffs 2018: 1:35.563 (Flinn Lazier)FE2 race best at Runoffs 2019: 1:52.154 (Liam Snyder)FE2 race best at Runoffs 2020: 2:13.271 (Owen McAllister)FE2 race best at Runoffs 2021: 1:36.655 (Max Grau)FE2 race best at Runoffs 2022: 2:12.045 (Jason Conzo)FE2 race best at Runoffs 2023: 1:51.098 (Franklin Futrelle)FE2 race best at Runoffs 2024: 2:12.748 (Porter Aiken)FE2 race best at Runoffs 2025: 2:13.339 (Franklin Futrelle)FE2 race best at Runoffs 2026: 2:11.881 (Franklin Futrelle)FE2 qualifying best at Runoffs 2018: 1:35.040 (Flinn Lazier)FE2 qualifying best at Runoffs 2019: 1:51.062 (Liam Snyder)FE2 qualifying best at Runoffs 2020: 2:12.806 (Scott Rettich)FE2 qualifying best at Runoffs 2021: 1:36.395 (Max Grau)FE2 qualifying best at Runoffs 2022: 1:50.853 (Charles Russell Turner)FE2 qualifying best at Runoffs 2023: 1:50.665 (Charles Russell Turner)FE2 qualifying best at Runoffs 2024: 2:11.506 (Porter Aiken)FE2 qualifying best at Runoffs 2025: 2:12.475 (Franklin Futrelle)FE2 qualifying best at Runoffs 2026: 2:12.326 (Franklin Futrelle)GT3 race best at Runoffs 2015: 2:03.617 (Joe Kristensen)GT3 race best at Runoffs 2016: 1:31.107 (Joe Kristensen)GT3 race best at Runoffs 2017: 1:46.330 (Collin Jackson)GT3 race best at Runoffs 2018: 1:42.634 (Michael Lewis)GT3 race best at Runoffs 2019: 1:59.045 (Tony Ave)GT3 race best at Runoffs 2020: 2:24.231 (Tony Ave)GT3 race best at Runoffs 2021: 1:46.694 (Troy Ermish)GT3 race best at Runoffs 2022: 2:24.347 (Tony Ave)GT3 race best at Runoffs 2023: 1:59.872 (Tony Ave)GT3 race best at Runoffs 2024: 2:22.863 (Tony Ave)GT3 qualifying best at Runoffs 2015: 2:01.736 (Joe Kristensen)GT3 qualifying best at Runoffs 2016: 1:30.797 (Gary Bockman)GT3 qualifying best at Runoffs 2017: 1:44.579 (Collin Jackson)GT3 qualifying best at Runoffs 2018: 1:40.947 (Michael Lewis)GT3 qualifying best at Runoffs 2019: 1:58.194 (Michael Lewis)GT3 qualifying best at Runoffs 2020: 2:21.882 (Michael Lewis)GT3 qualifying best at Runoffs 2021: 1:44.758 (Troy Ermish)GT3 qualifying best at Runoffs 2022: 1:57.135 (Jeff Dernehl)GT3 qualifying best at Runoffs 2023: 1:58.065 (Tony Ave)GT3 qualifying best at Runoffs 2024: 2:22.108 (Tony Ave)SM race best at Runoffs 2015: 2:24.067 (Todd Lamb)SM race best at Runoffs 2016: 1:40.764 (Michael Carter)SM race best at Runoffs 2017: 1:59.100 (Michael Gagliardo)SM race best at Runoffs 2018: 1:55.278 (Michael Carter)SM race best at Runoffs 2019: 2:16.459 (Elivan Goulart)SM race best at Runoffs 2020: 2:43.748 (Preston Pardus)SM race best at Runoffs 2021: 1:58.837 (Brian Henderson)SM race best at Runoffs 2022: 2:19.107 (Travis Wiley)SM race best at Runoffs 2023: 2:16.229 (Julian DaCosta)SM race best at Runoffs 2024: 2:41.486 (Brett Kowalski)SM race best at Runoffs 2025: 2:44.430 (Kyle Greenhill)SM race best at Runoffs 2026: 2:42.725 (Francisco Barroso)SM qualifying best at Runoffs 2015: 2:18.661 (Andrew Carbonell)SM qualifying best at Runoffs 2016: 1:40.514 (Justin Hille)SM qualifying best at Runoffs 2017: 1:58.306 (Chris Haldeman)SM qualifying best at Runoffs 2018: 1:54.355 (Ken Sutherland)SM qualifying best at Runoffs 2019: 2:14.552 (Todd Buras)SM qualifying best at Runoffs 2020: 2:42.209 (Kyle Greenhill)SM qualifying best at Runoffs 2021: 1:57.695 (Brian Henderson)SM qualifying best at Runoffs 2022: 2:14.664 (Danny Steyn)SM qualifying best at Runoffs 2023: 2:14.986 (Danny Steyn)SM qualifying best at Runoffs 2024: 2:41.106 (Ethan Goulart)SM qualifying best at Runoffs 2025: 2:43.111 (Bobby Gossett)SM qualifying best at Runoffs 2026: 2:42.173 (Brett Kowalski)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
ASFE2GT3SMsolid race · dashed qualifying · slower is lower
90%100%110%16 rule changes between Runoffs 2018 and Runoffs 201916 ▾37 rule changes between Runoffs 2019 and Runoffs 202037 ▾21 rule changes between Runoffs 2020 and Runoffs 202121 ▾27 rule changes between Runoffs 2021 and Runoffs 202227 ▾15 rule changes between Runoffs 2022 and Runoffs 202315 ▾45 rule changes between Runoffs 2023 and Runoffs 202445 ▾25 rule changes between Runoffs 2024 and Runoffs 202525 ▾18 rule changes between Runoffs 2025 and Runoffs 202618 ▾AS race best at Runoffs 2015: 100.0% of AS's (Andy McDermid)AS race best at Runoffs 2016: 100.0% of AS's (Edward Hosni)AS race best at Runoffs 2017: 100.0% of AS's (Bryan Long)AS race best at Runoffs 2018: 100.0% of AS's (John Heinricy)AS race best at Runoffs 2019: 100.0% of AS's (James Jost)AS race best at Runoffs 2020: 100.0% of AS's (Gregory Eaton)AS race best at Runoffs 2021: 100.0% of AS's (Gregory Eaton)AS race best at Runoffs 2022: 100.0% of AS's (Gregory Eaton)AS race best at Runoffs 2023: 100.0% of AS's (Gregory Eaton)AS race best at Runoffs 2024: 100.0% of AS's (Gregory Eaton)AS race best at Runoffs 2025: 100.0% of AS's (Gregory Eaton)AS race best at Runoffs 2026: 100.0% of AS's (Andrew McDermid)AS qualifying best at Runoffs 2015: 100.0% of AS's (Tom Sloe)AS qualifying best at Runoffs 2016: 100.0% of AS's (Tom Sloe)AS qualifying best at Runoffs 2017: 100.0% of AS's (James Jost)AS qualifying best at Runoffs 2018: 100.0% of AS's (Andrew McDermid)AS qualifying best at Runoffs 2019: 100.0% of AS's (Gregory Eaton)AS qualifying best at Runoffs 2020: 100.0% of AS's (Gregory Eaton)AS qualifying best at Runoffs 2021: 100.0% of AS's (Drew Cattell)AS qualifying best at Runoffs 2022: 100.0% of AS's (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 100.0% of AS's (Daniel Richardson)AS qualifying best at Runoffs 2024: 100.0% of AS's (Gregory Eaton)AS qualifying best at Runoffs 2025: 100.0% of AS's (Andrew McDermid)AS qualifying best at Runoffs 2026: 100.0% of AS's (Andrew McDermid)FE2 race best at Runoffs 2018: 86.6% of AS's (Flinn Lazier)FE2 race best at Runoffs 2019: 90.5% of AS's (Liam Snyder)FE2 race best at Runoffs 2020: 90.3% of AS's (Owen McAllister)FE2 race best at Runoffs 2021: 87.4% of AS's (Max Grau)FE2 race best at Runoffs 2022: 106.0% of AS's (Jason Conzo)FE2 race best at Runoffs 2023: 89.5% of AS's (Franklin Futrelle)FE2 race best at Runoffs 2024: 90.7% of AS's (Porter Aiken)FE2 race best at Runoffs 2025: 89.4% of AS's (Franklin Futrelle)FE2 race best at Runoffs 2026: 88.8% of AS's (Franklin Futrelle)FE2 qualifying best at Runoffs 2018: 88.2% of AS's (Flinn Lazier)FE2 qualifying best at Runoffs 2019: 90.3% of AS's (Liam Snyder)FE2 qualifying best at Runoffs 2020: 90.3% of AS's (Scott Rettich)FE2 qualifying best at Runoffs 2021: 87.3% of AS's (Max Grau)FE2 qualifying best at Runoffs 2022: 90.7% of AS's (Charles Russell Turner)FE2 qualifying best at Runoffs 2023: 89.9% of AS's (Charles Russell Turner)FE2 qualifying best at Runoffs 2024: 89.7% of AS's (Porter Aiken)FE2 qualifying best at Runoffs 2025: 90.2% of AS's (Franklin Futrelle)FE2 qualifying best at Runoffs 2026: 90.1% of AS's (Franklin Futrelle)GT3 race best at Runoffs 2015: 100.6% of AS's (Joe Kristensen)GT3 race best at Runoffs 2016: 97.5% of AS's (Joe Kristensen)GT3 race best at Runoffs 2017: 95.4% of AS's (Collin Jackson)GT3 race best at Runoffs 2018: 93.0% of AS's (Michael Lewis)GT3 race best at Runoffs 2019: 96.1% of AS's (Tony Ave)GT3 race best at Runoffs 2020: 97.7% of AS's (Tony Ave)GT3 race best at Runoffs 2021: 96.5% of AS's (Troy Ermish)Off the chart: GT3 race best at Runoffs 2022: 115.9% of AS's (Tony Ave)GT3 race best at Runoffs 2023: 96.6% of AS's (Tony Ave)GT3 race best at Runoffs 2024: 97.6% of AS's (Tony Ave)GT3 qualifying best at Runoffs 2015: 100.0% of AS's (Joe Kristensen)GT3 qualifying best at Runoffs 2016: 100.2% of AS's (Gary Bockman)GT3 qualifying best at Runoffs 2017: 99.4% of AS's (Collin Jackson)GT3 qualifying best at Runoffs 2018: 93.7% of AS's (Michael Lewis)GT3 qualifying best at Runoffs 2019: 96.1% of AS's (Michael Lewis)GT3 qualifying best at Runoffs 2020: 96.5% of AS's (Michael Lewis)GT3 qualifying best at Runoffs 2021: 94.9% of AS's (Troy Ermish)GT3 qualifying best at Runoffs 2022: 95.9% of AS's (Jeff Dernehl)GT3 qualifying best at Runoffs 2023: 95.9% of AS's (Tony Ave)GT3 qualifying best at Runoffs 2024: 97.0% of AS's (Tony Ave)Off the chart: SM race best at Runoffs 2015: 117.2% of AS's (Todd Lamb)SM race best at Runoffs 2016: 107.9% of AS's (Michael Carter)SM race best at Runoffs 2017: 106.8% of AS's (Michael Gagliardo)SM race best at Runoffs 2018: 104.5% of AS's (Michael Carter)SM race best at Runoffs 2019: 110.1% of AS's (Elivan Goulart)SM race best at Runoffs 2020: 110.9% of AS's (Preston Pardus)SM race best at Runoffs 2021: 107.4% of AS's (Brian Henderson)SM race best at Runoffs 2022: 111.7% of AS's (Travis Wiley)SM race best at Runoffs 2023: 109.8% of AS's (Julian DaCosta)SM race best at Runoffs 2024: 110.3% of AS's (Brett Kowalski)SM race best at Runoffs 2025: 110.2% of AS's (Kyle Greenhill)SM race best at Runoffs 2026: 109.6% of AS's (Francisco Barroso)SM qualifying best at Runoffs 2015: 113.9% of AS's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 110.9% of AS's (Justin Hille)SM qualifying best at Runoffs 2017: 112.4% of AS's (Chris Haldeman)SM qualifying best at Runoffs 2018: 106.1% of AS's (Ken Sutherland)SM qualifying best at Runoffs 2019: 109.4% of AS's (Todd Buras)SM qualifying best at Runoffs 2020: 110.3% of AS's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 106.6% of AS's (Brian Henderson)SM qualifying best at Runoffs 2022: 110.2% of AS's (Danny Steyn)SM qualifying best at Runoffs 2023: 109.7% of AS's (Danny Steyn)SM qualifying best at Runoffs 2024: 109.9% of AS's (Ethan Goulart)SM qualifying best at Runoffs 2025: 111.1% of AS's (Bobby Gossett)SM qualifying best at Runoffs 2026: 110.4% of AS's (Brett Kowalski)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
ASFE2GT3SMsolid race · dashed qualifying · each class's best lap as a share of AS's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventASFE2GT3SM
Qual best Race best Trap Qual best Race best Trap vs AS % of AS Qual best Race best Trap vs AS % of AS Qual best Race best Trap vs AS % of AS 
Road America Runoffs 20262026-09-282:26.911Andrew 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%)2:12.326Franklin Futrelle · fastest of 8 · top 5 within 1.9s-0.149s (-0.11%)2:11.881Franklin Futrelle · fastest of 8 · top 5 within 1.6s-1.458s (-1.09%)143.5Steve Whitston-5.5 mph (-3.7%)-16.590squal -14.585s88.8%qual 90.1%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%)+14.254squal +15.262s109.6%qual 110.4%
18 rule changes (AS: 13, FE2: 1, GT3: 2, SM: 2)5 weight · 3 engine · 2 removed · 2 tyres & wheels · 1 induction · 1 suspension & brakes · 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
  • 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
  • GT3 Remove GT3U from GCR as it is now in STU #39862removed
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • GT3 GT3U Ride Height #39637suspension & brakes
  • AS 1994 Mustang Spec Line Request #39104engine
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
  • FE2 FE & FE2 Bubble Tail #38978other
Road America Runoffs 20252025-09-292:26.792Andrew 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%)2:12.475Franklin Futrelle · fastest of 11 · top 5 within 1.4s+0.969s (+0.74%)2:13.339Franklin Futrelle · fastest of 10 · top 5 within 0.6s+0.591s (+0.45%)149.0Steve Whitston+3.7 mph (+2.6%)-15.893squal -14.317s89.4%qual 90.2%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%)+15.198squal +16.319s110.2%qual 111.1%
25 rule changes (AS: 11, FE2: 1, GT3: 9, SM: 4)9 weight · 6 engine · 2 induction · 1 aero · 1 removed · 1 tyres & wheels · 1 wording · 4 othershowhide
  • GT3 Declassify TCR Cars from GT3/GT3U #38569removed
  • 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
  • GT3 Clarification of GT3U #38266weight
  • SM Clarify Tire Marking Regs #38005tyres & wheels
  • AS Flotek Head Plunge Cut Inconsistencies #37502other
  • AS Notes clean up #37693weight
  • FE2 Driver Safety & Comfort #37965other
  • 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
  • GT3 Correct language regarding OEM Areo Devices #37137aero
  • GT3 VW Funcap weight #37217weight
  • GT3 Pontiac Weight and Chassis Adjustment Request #36938weight -150 lbs
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • GT3 GCR GT3 Disfranchised GT2 #36291weight -75 lbs
  • GT3 Nissan MR20DE Engine Classification Request for GT3 #36791engine
  • GT3 GT3 Mazda 13B PP correction #37057weight -175 lbs
  • GT3 GT3 Mazda12A PP Correction #37058weight -200 lbs
Road America Runoffs 20242024-10-012:26.578Gregory 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%)2:11.506Porter Aiken · fastest of 18 · top 5 within 0.5s-1.300s (-0.98%)2:12.748Porter Aiken · fastest of 17 · top 5 within 2.0s-0.523s (-0.39%)145.3Porter Aiken+1.9 mph (+1.3%)-13.681squal -15.072s90.7%qual 89.7%2:22.108Tony Ave · fastest of 13 · top 5 within 3.7s+0.226s (+0.16%)2:22.863Tony Ave · fastest of 13 · top 5 within 3.3s-1.368s (-0.95%)151.2Jeff Dernehl+1.8 mph (+1.2%)-3.566squal -4.470s97.6%qual 97.0%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%)+15.057squal +14.528s110.3%qual 109.9%
45 rule changes (AS: 11, GT3: 30, SM: 4)11 engine · 10 cars added · 9 weight · 3 induction · 2 tyres & wheels · 1 aero · 1 removed · 1 suspension & brakes · 3 wording · 4 othershowhide
  • AS Mustang transmission ratios #36662engine
  • GT3 2024 Mazda 3 TC request for GT3 #36517cars added
  • SM SMX Camera Rule Correction #36496wording
  • SM AIM ECU Protocol #36556engine
  • SM OE versus OEM Definitons #36608other
  • SM Shifter Bushing #36611suspension & brakes
  • GT3 Adding Datsun B110 to List of Approved Cars #36198cars added
  • GT3 Honda Civic Type R TCR Weight Reduction Request #36550weight
  • GT3 Correct missed Disenfranchised weight reduction #36237weight
  • GT3 errors & omissions on GT3 Mazda MZR spec lines #36241removed
  • AS Request for Classification of 2018-2023 mustang In #35764cars added
  • GT3 GT3 +1mm SIR add 175lbs. In #36098induction
  • GT3 Revised GT3 Built Turbocharged chart #36100induction
  • 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
  • GT3 Request for Spec Line 1010 Reconsideration #35009weight +300 lbs
  • GT3 Mazda MZR Engines #35753engine
  • GT3 Disenfranchised GT2 Acura RSX to Run GT3 #35773weight
  • GT3 Toyota 4Y Engine Request #35885engine
  • GT3 GT3 spec lines clean-up #36008wording
  • GT3 GT3 Honda spec line clean-up x 2 #36009engine
  • GT3 GT3 Mazda spec line clean-up x2 #36010wording
  • 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
  • GT3 Miata Turbo Clarification #35386induction +100 lbs
  • GT3 Rear Blade Spoiler Clarification #35261aero
  • GT3 GT Direct Injection allowance and rules #35437engine
  • GT3 Request to Include Toyota FA24D Engine for use in GT3 #35199engine
  • GT3 GT2/3 remove Direction Injection not allowed in Spec line notes #35439engine
  • GT3 Edit GT3 Nissan QR25DE/DD spec line #35442engine
  • GT3 Disenfranchised GT2 RX7. #35028weight
  • GT3 Turbo Help #35042weight -100 lbs
  • GT3 Competition Adjustment Request for 13B Peripheral Port #35100weight -100 lbs
  • GT3 Request to Include Toyota GR 86 in GT3 #35197cars added
  • GT3 Fastrack Toyota 3S Correction #35258engine
  • GT3 Toyota Engine Classification Request #35019engine
  • GT3 GT3 2.0L SIR & weight #35171weight
  • GT3 Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight
  • GT3 GT3 TCR 200 TW tires #34993tyres & wheels
  • GT3 Classify Honda B20 engine in GT3 CRX #34781cars added
Virginia International Raceway Runoffs 20232023-09-232:03.082Daniel 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%)1:50.665Charles Russell Turner · fastest of 26 · top 5 within 2.3s-0.188s (-0.17%)1:51.098Franklin Futrelle · fastest of 19 · top 5 within 1.4s-20.947s (-15.86%)141.3Franklin Futrelle-0.6 mph (-0.4%)-13.022squal -12.417s89.5%qual 89.9%1:58.065Tony Ave · fastest of 9 · top 5 within 3.8s+0.930s (+0.79%)1:59.872Tony Ave · fastest of 8 · top 5 within 3.9s-24.475s (-16.96%)145.8Jeff Dernehl-3.6 mph (-2.4%)-4.248squal -5.017s96.6%qual 95.9%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%)+12.109squal +11.904s109.8%qual 109.7%
15 rule changes (AS: 4, GT3: 10, SM: 1)5 engine · 3 induction · 3 tyres & wheels · 2 weight · 1 cars added · 1 suspension & brakesshowhide
  • 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
  • GT3 Addendum to letter 33913, GT3 DOT tires. #34627tyres & wheels
  • GT3 Please classify Fields Cardinal V8 #33784cars added
  • GT3 Remove Nissan VG30 engine from GT3 #33609engine
  • GT3 GT3 Choke option effective 1-01-2023 #33669induction
  • GT3 GT3 2.0L choke/weight option #33670weight
  • SM BOP for NB1 and NB2 #32309weight
  • GT3 Turbocharged Engine Rules #33145induction
  • GT3 GT2 (TA2)/GTA Part Number Update #33315induction
  • GT3 GT3 Nissian SR20VET unrestricted ECU change #33432engine
  • GT3 Add 84-87 Civic #33091tyres & wheels
  • GT3 GT3 Turbo Displacement Clarification #32952engine
Virginia International Raceway Runoffs 20222022-09-242:02.162Kurt 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%)1:50.853Charles Russell Turner · fastest of 25 · top 5 within 1.1s-0.209s (-0.19%)2:12.045Jason Conzo · fastest of 22 · top 5 within 1.8s+19.891s (+17.74%)141.9Eric Cruz-0.6 mph (-0.5%)+7.467squal -11.309s106.0%qual 90.7%1:57.135Jeff Dernehl · fastest of 13 · top 5 within 3.2s-1.059s (-0.90%)2:24.347Tony Ave · fastest of 12 · top 5 within 8.2s+25.302s (+21.25%)149.5Jeff Dernehl-0.2 mph (-0.1%)+19.769squal -5.027s115.9%qual 95.9%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%)+14.529squal +12.502s111.7%qual 110.2%
27 rule changes (AS: 9, GT3: 17, SM: 1)9 cars added · 4 weight · 3 engine · 3 suspension & brakes · 1 aero · 1 tyres & wheels · 3 wording · 3 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • GT3 Tail lights on all GT category race cars. #32799suspension & brakes
  • GT3 SR20VET Engine Option Request #32648engine
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • GT3 Correct Model GT3 - Fiat #32776wording
  • GT3 Correct Fiat Spider Years #32149cars added
  • GT3 wheel size addition #32247tyres & wheels
  • GT3 GT3 TCR Car Feedback #31677weight +2 lbs
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • GT3 Request to Classify Ginetta G40 in GT3 #31598cars added
  • GT3 Normally Aspirated 2.0L DOHC MZR Motor #31733cars added
  • GT3 Volvo S60 in GT3 #31970cars added
  • GT3 GT3 2.0L 4V engines now unrestricted. #32190engine
  • GT3 TB correction to wing wording #32191aero
  • GT3 Request to add Fiat to GT3 CARS #31803cars added
  • GT3 Request to add Fiat to GT3 CARS #31804cars added
  • 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
  • GT3 31032 correction to weight #31525weight -210 lbs
  • GT3 Add TCR cars to GT3 #31540cars added
  • GT3 Please approve 1964-1968 Ford Cortina GT for competition in GT# #30941cars added
  • AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other
  • AS Request Pontiac GTO tire size change #30881weight
  • GT3 Request car classification #31032cars added
Indianapolis Motor Speedway Runoffs 20212021-09-251:50.427Drew 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 Jost1:36.395Max Grau · fastest of 28 · top 5 within 0.7s1:36.655Max Grau · fastest of 28 · top 5 within 0.7s146.2Gray Fowler-13.951squal -14.032s87.4%qual 87.3%1:44.758Troy Ermish · fastest of 14 · top 5 within 4.6s+0.179s (+0.17%)1:46.694Troy Ermish · fastest of 13 · top 5 within 4.1s+0.364s (+0.34%)145.8Stacy Wilson-3.912squal -5.669s96.5%qual 94.9%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+8.231squal +7.268s107.4%qual 106.6%
21 rule changes (AS: 14, GT3: 6, SM: 1)6 weight · 4 cars added · 3 engine · 3 induction · 3 wording · 2 othershowhide
  • GT3 Request to Update GTA Obsolete Part Numbers #30615wording
  • GT3 Request to Permit FP cars in GT3 #30611other
  • 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
  • GT3 Mazda MZR 2.0L Engine #30455induction
  • GT3 Disfranchised GT3 Mazda, correct choke size #30570induction
  • 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
  • GT3 Mazda MZR SIR Sizing #29555induction
  • GT3 Request to Classify 1992-1997 Honda Prelude #29687cars added
Road America Runoffs 20202020-10-022:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s149.2Gregory Eaton2:12.806Scott Rettich · fastest of 25 · top 5 within 0.6s2:13.271Owen McAllister · fastest of 23 · top 5 within 0.7s143.4Owen McAllister-14.397squal -14.239s90.3%qual 90.3%2:21.882Michael Lewis · fastest of 12 · top 5 within 3.0s2:24.231Tony Ave · fastest of 12 · top 5 within 3.0s149.5Jeff Dernehl-3.437squal -5.163s97.7%qual 96.5%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+16.080squal +15.164s110.9%qual 110.3%
37 rule changes (AS: 16, FE2: 2, GT3: 17, SM: 2)8 induction · 6 cars added · 5 aero · 5 engine · 4 weight · 3 suspension & brakes · 2 tyres & wheels · 1 wording · 3 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • FE2 FE/FE2 Oil Cooler #29293wording
  • GT3 GT Category Wording #29193induction
  • 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
  • GT3 Request to add Mazda 12A Peripheral Port to GT3 rule set #28842cars added
  • GT3 TA2 Gurney flap wicker clarification #28874aero
  • GT3 STO Gurney flap wicker clarification #28883aero
  • GT3 GT Gurney flap wicker clarification #28909aero
  • GT3 GT3 4v SIR size increase. #28931induction
  • GT3 Request for Addition to GT3 Approved Turbo List #27576induction
  • GT3 Request Nissan KA24E specifications #28808weight
  • AS weight adjustments for 2020 season #28785weight -50 lbs
  • GT3 Error Regarding Mazda Engine Listing #28119engine +245 lbs
  • 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
  • GT3 Windshield Clips #27323other
  • GT3 Request Factory Five Daytona coupe classification #26308cars added
  • GT3 Request restrictor size change request #26958induction
  • GT3 Request to Classify Alfa Romeo 4C #27322cars added
  • GT3 Request for Mazda 2.5l MZR/L5-VE #27570induction -245 lbs
  • GT3 GT3 turbo engines add Honda #28033induction
  • GT3 GT3 wing end plate #28035aero
  • FE2 FE / FE2 Update Rules #27624weight
  • GT3 Request to Add SR16VE to GT-3 Spec Lines #27357cars added
Virginia International Raceway Runoffs 20192019-10-052:02.938Gregory Eaton · fastest of 17 · top 5 within 0.8s2:03.900James Jost · fastest of 16 · top 5 within 2.1s153.9James Jost1:51.062Liam Snyder · fastest of 20 · top 5 within 1.3s1:52.154Liam Snyder · fastest of 19 · top 5 within 0.7s142.6Robert Vanman-11.746squal -11.876s90.5%qual 90.3%1:58.194Michael Lewis · fastest of 17 · top 5 within 2.2s1:59.045Tony Ave · fastest of 16 · top 5 within 1.7s149.6Jeff Dernehl-4.855squal -4.744s96.1%qual 96.1%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+12.559squal +11.614s110.1%qual 109.4%
16 rule changes (AS: 4, GT3: 8, SM: 4)4 cars added · 4 weight · 2 engine · 2 suspension & brakes · 1 induction · 1 tyres & wheels · 1 wording · 1 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • GT3 Requesting Increase in Choke Diameter for Mazda 12A Bridgeport #27043induction
  • AS Request Ride Height Clarification #26598suspension & brakes
  • AS Request to Revert to 2017 Weights #25885weight
  • GT3 Request GTX Fuel injection for previous GT-1 tube frame cars #26141engine
  • GT3 Request to Classify Ligier JS2 R #26535cars added
  • GT3 26076 revised Spec line chart #26528weight
  • GT3 Request Ride Height Clarification #26600suspension & brakes
  • GT3 Request clarification on bridge porting for rotary #26076weight
  • GT3 Request to add 4G69 Mitsubishi #26154cars added
  • SM Request to allow aftermarket fuel filters. #26370wording
  • AS SMG Mustang eligibility in American sedan #26224cars added
  • 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
  • GT3 GTX Homologation table update #26034cars added
Sonoma Raceway Runoffs 20182018-10-101:47.782Andrew McDermid · fastest of 12 · top 5 within 1.9s1:50.345John Heinricy · fastest of 10 · top 5 within 2.3s105.0Kevin Fandozzi1:35.040Flinn Lazier · fastest of 9 · top 5 within 1.5s1:35.563Flinn Lazier · fastest of 9 · top 5 within 1.7s126.8Scott Rettich-14.782squal -12.742s86.6%qual 88.2%1:40.947Michael Lewis · fastest of 10 · top 5 within 3.8s1:42.634Michael Lewis · fastest of 8 · top 5 within 4.4s115.7Collin Jackson-7.711squal -6.835s93.0%qual 93.7%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+4.933squal +6.573s104.5%qual 106.1%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:45.220James Jost · fastest of 29 · top 5 within 6.7s1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s1:44.579Collin Jackson · fastest of 17 · top 5 within 5.0s1:46.330Collin Jackson · fastest of 15 · top 5 within 3.1s-5.177squal -0.641s95.4%qual 99.4%1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s+7.593squal +13.086s106.8%qual 112.4%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s1:30.797Gary Bockman · fastest of 15 · top 5 within 2.0s1:31.107Joe Kristensen · fastest of 14 · top 5 within 2.5s-2.317squal +0.146s97.5%qual 100.2%1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s+7.340squal +9.863s107.9%qual 110.9%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s2:01.736Joe Kristensen · fastest of 11 · top 5 within 3.0s2:03.617Joe Kristensen · fastest of 10 · top 5 within 1.8s+0.695squal -0.010s100.6%qual 100.0%2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s+21.145squal +16.915s117.2%qual 113.9%

By track

TrackEvents Typical % of AS 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 AS'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.