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BoP Lab / Classes / GT1

GT1 vs FM vs AS vs SM pace at every track

Lap times across years say as much about the weather as the class. % of GT1 is each class's best lap as a share of GT1'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-SpecEPFAFCFE2FFvsFM×FPFVFXGT1×GT2GTXHPPP2vsSM×SMXSRF3STLSTUT1T2T3T4Show 50 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: GT1 100.0% of GT1 Michael Lewis, Daytona International Speedway Runoffs 2015 race · FM 100.4% of GT1 Bryce Cornet, Sonoma Raceway Runoffs 2018 race · AS 90.2% of GT1 Gregory Eaton, Virginia International Raceway Runoffs 2022 race · SM 100.7% of GT1 Travis Wiley, Virginia International Raceway Runoffs 2022 race

1:201:402:002:202:4014 rule changes between Runoffs 2018 and Runoffs 201914 ▾30 rule changes between Runoffs 2019 and Runoffs 202030 ▾16 rule changes between Runoffs 2020 and Runoffs 202116 ▾16 rule changes between Runoffs 2021 and Runoffs 202216 ▾12 rule changes between Runoffs 2022 and Runoffs 202312 ▾23 rule changes between Runoffs 2023 and Runoffs 202423 ▾22 rule changes between Runoffs 2024 and Runoffs 202522 ▾24 rule changes between Runoffs 2025 and Runoffs 202624 ▾GT1 race best at Runoffs 2015: 1:47.116 (Michael Lewis)GT1 race best at Runoffs 2016: 1:22.866 (Michael Lewis)GT1 race best at Runoffs 2017: 1:36.187 (Cliff Ebben)GT1 race best at Runoffs 2018: 1:37.516 (Michael Lewis)GT1 race best at Runoffs 2019: 1:48.562 (Tony Ave)GT1 race best at Runoffs 2020: 2:05.282 (Ernie Francis Jr)GT1 race best at Runoffs 2021: 1:53.220 (David Pintaric)GT1 race best at Runoffs 2022: 2:18.094 (David Pintaric)GT1 race best at Runoffs 2024: 2:06.893 (Dave Ruehlow)GT1 race best at Runoffs 2025: 2:04.058 (Tony Ave)GT1 race best at Runoffs 2026: 2:04.611 (Tony Ave)GT1 qualifying best at Runoffs 2015: 1:44.244 (Michael Lewis)GT1 qualifying best at Runoffs 2016: 1:21.927 (Cliff Ebben)GT1 qualifying best at Runoffs 2017: 1:36.008 (David Pintaric)GT1 qualifying best at Runoffs 2018: 1:35.673 (Michael Lewis)GT1 qualifying best at Runoffs 2019: 1:43.857 (Tony Ave)GT1 qualifying best at Runoffs 2020: 2:02.936 (Ernie Francis Jr)GT1 qualifying best at Runoffs 2021: 1:35.279 (Michael Lewis)GT1 qualifying best at Runoffs 2022: 1:46.808 (David Pintaric)GT1 qualifying best at Runoffs 2023: 1:48.203 (David Pintaric)GT1 qualifying best at Runoffs 2024: 2:02.535 (Dave Ruehlow)GT1 qualifying best at Runoffs 2025: 2:01.273 (Tony Ave)GT1 qualifying best at Runoffs 2026: 2:02.981 (Tony Ave)FM race best at Runoffs 2015: 1:58.029 (Joseph Burton-Harris)FM race best at Runoffs 2016: 1:27.922 (Jacob Loomis)FM race best at Runoffs 2017: 1:41.146 (Jarret Voorhies)FM race best at Runoffs 2018: 1:37.909 (Bryce Cornet)FM race best at Runoffs 2019: 2:15.816 (Bryce Cornet)FM qualifying best at Runoffs 2015: 1:57.804 (Joseph Burton-Harris)FM qualifying best at Runoffs 2016: 1:26.043 (Jacob Loomis)FM qualifying best at Runoffs 2017: 1:41.231 (Jarret Voorhies)FM qualifying best at Runoffs 2018: 1:37.598 (Bryce Cornet)FM qualifying best at Runoffs 2019: 1:55.124 (Bryce Cornet)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)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
GT1FMASSMsolid race · dashed qualifying · slower is lower
100%110%120%130%14 rule changes between Runoffs 2018 and Runoffs 201914 ▾30 rule changes between Runoffs 2019 and Runoffs 202030 ▾16 rule changes between Runoffs 2020 and Runoffs 202116 ▾16 rule changes between Runoffs 2021 and Runoffs 202216 ▾12 rule changes between Runoffs 2022 and Runoffs 202312 ▾23 rule changes between Runoffs 2023 and Runoffs 202423 ▾22 rule changes between Runoffs 2024 and Runoffs 202522 ▾24 rule changes between Runoffs 2025 and Runoffs 202624 ▾GT1 race best at Runoffs 2015: 100.0% of GT1's (Michael Lewis)GT1 race best at Runoffs 2016: 100.0% of GT1's (Michael Lewis)GT1 race best at Runoffs 2017: 100.0% of GT1's (Cliff Ebben)GT1 race best at Runoffs 2018: 100.0% of GT1's (Michael Lewis)GT1 race best at Runoffs 2019: 100.0% of GT1's (Tony Ave)GT1 race best at Runoffs 2020: 100.0% of GT1's (Ernie Francis Jr)GT1 race best at Runoffs 2021: 100.0% of GT1's (David Pintaric)GT1 race best at Runoffs 2022: 100.0% of GT1's (David Pintaric)GT1 race best at Runoffs 2024: 100.0% of GT1's (Dave Ruehlow)GT1 race best at Runoffs 2025: 100.0% of GT1's (Tony Ave)GT1 race best at Runoffs 2026: 100.0% of GT1's (Tony Ave)GT1 qualifying best at Runoffs 2015: 100.0% of GT1's (Michael Lewis)GT1 qualifying best at Runoffs 2016: 100.0% of GT1's (Cliff Ebben)GT1 qualifying best at Runoffs 2017: 100.0% of GT1's (David Pintaric)GT1 qualifying best at Runoffs 2018: 100.0% of GT1's (Michael Lewis)GT1 qualifying best at Runoffs 2019: 100.0% of GT1's (Tony Ave)GT1 qualifying best at Runoffs 2020: 100.0% of GT1's (Ernie Francis Jr)GT1 qualifying best at Runoffs 2021: 100.0% of GT1's (Michael Lewis)GT1 qualifying best at Runoffs 2022: 100.0% of GT1's (David Pintaric)GT1 qualifying best at Runoffs 2023: 100.0% of GT1's (David Pintaric)GT1 qualifying best at Runoffs 2024: 100.0% of GT1's (Dave Ruehlow)GT1 qualifying best at Runoffs 2025: 100.0% of GT1's (Tony Ave)GT1 qualifying best at Runoffs 2026: 100.0% of GT1's (Tony Ave)FM race best at Runoffs 2015: 110.2% of GT1's (Joseph Burton-Harris)FM race best at Runoffs 2016: 106.1% of GT1's (Jacob Loomis)FM race best at Runoffs 2017: 105.2% of GT1's (Jarret Voorhies)FM race best at Runoffs 2018: 100.4% of GT1's (Bryce Cornet)FM race best at Runoffs 2019: 125.1% of GT1's (Bryce Cornet)FM qualifying best at Runoffs 2015: 113.0% of GT1's (Joseph Burton-Harris)FM qualifying best at Runoffs 2016: 105.0% of GT1's (Jacob Loomis)FM qualifying best at Runoffs 2017: 105.4% of GT1's (Jarret Voorhies)FM qualifying best at Runoffs 2018: 102.0% of GT1's (Bryce Cornet)FM qualifying best at Runoffs 2019: 110.8% of GT1's (Bryce Cornet)AS race best at Runoffs 2015: 114.8% of GT1's (Andy McDermid)AS race best at Runoffs 2016: 112.7% of GT1's (Edward Hosni)AS race best at Runoffs 2017: 115.9% of GT1's (Bryan Long)AS race best at Runoffs 2018: 113.2% of GT1's (John Heinricy)AS race best at Runoffs 2019: 114.1% of GT1's (James Jost)AS race best at Runoffs 2020: 117.9% of GT1's (Gregory Eaton)AS race best at Runoffs 2021: 97.7% of GT1's (Gregory Eaton)Off the chart: AS race best at Runoffs 2022: 90.2% of GT1's (Gregory Eaton)AS race best at Runoffs 2024: 115.4% of GT1's (Gregory Eaton)AS race best at Runoffs 2025: 120.3% of GT1's (Gregory Eaton)AS race best at Runoffs 2026: 119.1% of GT1's (Andrew McDermid)AS qualifying best at Runoffs 2015: 116.8% of GT1's (Tom Sloe)AS qualifying best at Runoffs 2016: 110.6% of GT1's (Tom Sloe)AS qualifying best at Runoffs 2017: 109.6% of GT1's (James Jost)AS qualifying best at Runoffs 2018: 112.7% of GT1's (Andrew McDermid)AS qualifying best at Runoffs 2019: 118.4% of GT1's (Gregory Eaton)AS qualifying best at Runoffs 2020: 119.6% of GT1's (Gregory Eaton)AS qualifying best at Runoffs 2021: 115.9% of GT1's (Drew Cattell)AS qualifying best at Runoffs 2022: 114.4% of GT1's (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 113.8% of GT1's (Daniel Richardson)AS qualifying best at Runoffs 2024: 119.6% of GT1's (Gregory Eaton)AS qualifying best at Runoffs 2025: 121.0% of GT1's (Andrew McDermid)AS qualifying best at Runoffs 2026: 119.5% of GT1's (Andrew McDermid)SM race best at Runoffs 2015: 134.5% of GT1's (Todd Lamb)SM race best at Runoffs 2016: 121.6% of GT1's (Michael Carter)SM race best at Runoffs 2017: 123.8% of GT1's (Michael Gagliardo)SM race best at Runoffs 2018: 118.2% of GT1's (Michael Carter)SM race best at Runoffs 2019: 125.7% of GT1's (Elivan Goulart)SM race best at Runoffs 2020: 130.7% of GT1's (Preston Pardus)SM race best at Runoffs 2021: 105.0% of GT1's (Brian Henderson)SM race best at Runoffs 2022: 100.7% of GT1's (Travis Wiley)SM race best at Runoffs 2024: 127.3% of GT1's (Brett Kowalski)SM race best at Runoffs 2025: 132.5% of GT1's (Kyle Greenhill)SM race best at Runoffs 2026: 130.6% of GT1's (Francisco Barroso)SM qualifying best at Runoffs 2015: 133.0% of GT1's (Andrew Carbonell)SM qualifying best at Runoffs 2016: 122.7% of GT1's (Justin Hille)SM qualifying best at Runoffs 2017: 123.2% of GT1's (Chris Haldeman)SM qualifying best at Runoffs 2018: 119.5% of GT1's (Ken Sutherland)SM qualifying best at Runoffs 2019: 129.6% of GT1's (Todd Buras)SM qualifying best at Runoffs 2020: 131.9% of GT1's (Kyle Greenhill)SM qualifying best at Runoffs 2021: 123.5% of GT1's (Brian Henderson)SM qualifying best at Runoffs 2022: 126.1% of GT1's (Danny Steyn)SM qualifying best at Runoffs 2023: 124.8% of GT1's (Danny Steyn)SM qualifying best at Runoffs 2024: 131.5% of GT1's (Ethan Goulart)SM qualifying best at Runoffs 2025: 134.5% of GT1's (Bobby Gossett)SM qualifying best at Runoffs 2026: 131.9% of GT1'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
GT1FMASSMsolid race · dashed qualifying · each class's best lap as a share of GT1's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventGT1FMASSM
Qual best Race best Trap Qual best Race best Trap vs GT1 % of GT1 Qual best Race best Trap vs GT1 % of GT1 Qual best Race best Trap vs GT1 % of GT1 
Road America Runoffs 20262026-09-282:02.981Tony Ave · fastest of 12 · top 5 within 4.6s+1.708s (+1.41%)2:04.611Tony Ave · fastest of 12 · top 5 within 3.9s+0.553s (+0.45%)177.9Tony Ave-2.7 mph (-1.5%)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%)+23.860squal +23.930s119.1%qual 119.5%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%)+38.114squal +39.192s130.6%qual 131.9%
24 rule changes (GT1: 9, AS: 13, SM: 2)9 weight · 3 engine · 2 cars added · 2 removed · 2 tyres & wheels · 1 induction · 1 wording · 4 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
  • GT1 Request TA Cup Cars Into GT1 #40250other
  • GT1 Request TA Cup Cars Into GT1 #40250cars added
  • GT1 Lamborghini Huracan Super Trofeo in GT1 #40288cars added
  • SM Rear Toe Link #40271other
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • GT1 Request for Huracan GT3 Evo Weight Reduction to 2950lbs #40147weight -50 lbs
  • 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
  • GT1 Reduce Weight for GM 275ci Carbureted V6s #39713weight
  • GT1 Remove GT3U from GCR as it is now in STU #39862removed
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • GT1 Request for Addition of Porsche 992.1 GT3 Cup into GT1 #39322other
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • GT1 NSX Parity With Other GT3s Let Alone a GT1 Car #39311weight -100 lbs
  • AS 1994 Mustang Spec Line Request #39104engine
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
  • GT1 RM 25-06 GT1 reclassify the Acura NSX GT3 EVO 22 to GT1-ST #39101weight
Road America Runoffs 20252025-09-292:01.273Tony Ave · fastest of 14 · top 5 within 7.7s-1.262s (-1.03%)2:04.058Tony Ave · fastest of 12 · top 5 within 5.8s-2.835s (-2.23%)180.6Dave Ruehlow-0.4 mph (-0.2%)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%)+25.174squal +25.519s120.3%qual 121.0%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%)+40.372squal +41.838s132.5%qual 134.5%
22 rule changes (GT1: 7, AS: 11, SM: 4)7 engine · 4 weight · 3 induction · 2 cars added · 1 aero · 1 tyres & wheels · 1 wording · 3 othershowhide
  • GT1 Correction to Limited prep LS Chevy engine for GT1 #38902engine
  • 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
  • GT1 Request to Classify Acura NSX GT3 Evo 22 #37367cars 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
  • GT1 Addition of a limited prep LS Chevy engine for GT1 #37045engine
  • GT1 Correct language regarding OEM Areo Devices #37137aero
  • GT1 GT1-ST Adjustments #37481weight
  • GT1 Lamborghini Huracan GT3 Evo Restrictor Help #36254induction
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • GT1 Request to Classify Mazda 26B Engine #36230cars added
Road America Runoffs 20242024-10-012:02.535Dave Ruehlow · fastest of 10 · top 5 within 4.6s-0.401s (-0.33%)2:06.893Dave Ruehlow · fastest of 6 · top 5 within 50.8s+1.611s (+1.29%)181.0Dave Ruehlow+0.5 mph (+0.3%)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%)+19.536squal +24.043s115.4%qual 119.6%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%)+34.593squal +38.571s127.3%qual 131.5%
23 rule changes (GT1: 8, AS: 11, SM: 4)7 cars added · 5 engine · 2 weight · 1 aero · 1 suspension & brakes · 1 tyres & wheels · 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
  • GT1 Request for Spec Line 1010 Reconsideration #35009weight +300 lbs
  • GT1 Camaro 1993- and 2010- #35652other
  • 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
  • GT1 Rear Blade Spoiler Clarification #35261aero
  • GT1 GT Direct Injection allowance and rules #35437engine
  • GT1 GT2/3 remove Direction Injection not allowed in Spec line notes #35439engine
  • GT1 Request for Acceptance of Lamborghini Huracan GT3 in GT1-ST #34929cars added
  • GT1 Cylinder heads #35040engine
  • GT1 Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight
Virginia International Raceway Runoffs 20232023-09-231:48.203David Pintaric · fastest of 5 · top 5 within 22.4s+1.395s (+1.31%)178.1David Pintaric-3.6 mph (-2.0%)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%)+14.879s qual113.8% qual2:14.986Danny 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%)+26.783s qual124.8% qual
12 rule changes (GT1: 7, AS: 4, SM: 1)4 weight · 2 cars added · 2 engine · 1 induction · 1 suspension & brakes · 1 tyres & wheels · 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
  • GT1 Please classify Fields Cardinal V8 #33784cars added
  • GT1 Mercedes AMG GT3 Notes #33804other
  • GT1 Sequential Transmission Weight Penalty #33503weight
  • GT1 GT1 Porsche 992 #33730cars added
  • SM BOP for NB1 and NB2 #32309weight
  • GT1 GT2 (TA2)/GTA Part Number Update #33315induction
  • GT1 Request to Reduce Trans Am Bodywork Weight Penalty #33331weight
  • GT1 Request for Reduction in FR9 Weight Penalty #33332weight
Virginia International Raceway Runoffs 20222022-09-241:46.808David Pintaric · fastest of 8 · top 5 within 3.7s+2.951s (+2.84%)2:18.094David Pintaric · fastest of 7 · top 5 within 13.7s+29.532s (+27.20%)181.7Adam Romito-1.5 mph (-0.8%)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%)-13.516squal +15.354s90.2%qual 114.4%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%)+1.013squal +27.856s100.7%qual 126.1%
16 rule changes (GT1: 6, AS: 9, SM: 1)3 suspension & brakes · 3 weight · 2 cars added · 2 tyres & wheels · 1 engine · 2 wording · 3 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • GT1 Tail lights on all GT category race cars. #32799suspension & brakes
  • GT1 GT-1/TransAm rules simplification/modernizing #32763weight
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • GT1 Mercedes Benz AMG GT3 in GT1 #31883cars added
  • GT1 Wheel Widths #32205tyres & wheels
  • GT1 Wheel Widths #31844tyres & wheels
  • 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
  • AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other
  • AS Request Pontiac GTO tire size change #30881weight
  • GT1 Request car classification #31032cars added
Indianapolis Motor Speedway Runoffs 20212021-09-251:35.279Michael Lewis · fastest of 20 · top 5 within 0.6s-0.729s (-0.76%)1:53.220David Pintaric · fastest of 14 · top 5 within 3.8s+17.033s (+17.71%)180.2Tom Smith1:50.427Drew 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-2.614squal +15.148s97.7%qual 115.9%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+5.617squal +22.416s105.0%qual 123.5%
16 rule changes (GT1: 1, AS: 14, SM: 1)6 weight · 3 cars added · 3 engine · 3 wording · 1 othershowhide
  • GT1 Request to Update GTA Obsolete Part Numbers #30615wording
  • 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
  • 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 20202020-10-022:02.936Ernie Francis Jr · fastest of 16 · top 5 within 3.4s2:05.282Ernie Francis Jr · fastest of 16 · top 5 within 3.4s180.5Simon Gregg2:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s149.2Gregory Eaton+22.386squal +24.109s117.9%qual 119.6%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+38.466squal +39.273s130.7%qual 131.9%
30 rule changes (GT1: 12, AS: 16, SM: 2)5 aero · 5 engine · 4 cars added · 4 weight · 3 induction · 3 suspension & brakes · 2 tyres & wheels · 4 othershowhide
  • SM Radiator E&O Clarifications #29294engine
  • GT1 GT Category Wording #29193induction
  • AS Dodge Challenger AS Spec Line Clarification #28698induction
  • AS Dodge Challenger AS Spec Line Clarification #2 #28699aero
  • GT1 Request to Allow New Trans Am Legal Engines in GT1 #29002engine
  • 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
  • GT1 TA2 Gurney flap wicker clarification #28874aero
  • GT1 STO Gurney flap wicker clarification #28883aero
  • GT1 GT1 Gurney flap wicker clarification #28886aero
  • GT1 GT Gurney flap wicker clarification #28909aero
  • AS weight adjustments for 2020 season #28785weight -50 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
  • GT1 Windshield Clips #27323other
  • GT1 Request to classify the Ford Coyote 3rd Gen OEM #27146cars added
  • GT1 Request Factory Five Daytona coupe classification #26308cars added
  • GT1 Request to Adjust Transmission Penalty #27750weight
  • GT1 Request to Reduce Additional Weight for 18 #27751weight
  • GT1 Request for Five Star Nascar Compliant Bodywork #27756other
Virginia International Raceway Runoffs 20192019-10-051:43.857Tony Ave · fastest of 12 · top 5 within 3.9s1:48.562Tony Ave · fastest of 11 · top 5 within 11.4s183.2Tony Ave1:55.124Bryce Cornet · fastest of 8 · top 5 within 2.3s2:15.816Bryce Cornet · fastest of 8 · top 5 within 4.9s135.7Bryce Cornet+27.254squal +11.267s125.1%qual 110.8%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+15.338squal +19.081s114.1%qual 118.4%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+27.897squal +30.695s125.7%qual 129.6%
14 rule changes (GT1: 6, AS: 4, SM: 4)4 cars added · 2 engine · 2 suspension & brakes · 2 weight · 1 aero · 1 tyres & wheels · 1 wording · 1 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • GT1 Request to classify Porsche 944/968 #26242cars added
  • AS Request Ride Height Clarification #26598suspension & brakes
  • GT1 Clarify Trans Am Legal Bodywork and Wing #26953aero
  • AS Request to Revert to 2017 Weights #25885weight
  • GT1 Request GTX Fuel injection for previous GT-1 tube frame cars #26141engine
  • GT1 Request to Classify Ligier JS2 R #26535cars added
  • GT1 Request Ride Height Clarification #26600suspension & brakes
  • 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
  • GT1 GTX Homologation table update #26034cars added
Sonoma Raceway Runoffs 20182018-10-101:35.673Michael Lewis · fastest of 8 · top 5 within 7.1s1:37.516Michael Lewis · fastest of 7 · top 5 within 5.3s111.6Preston Calvert1:37.598Bryce Cornet · fastest of 13 · top 5 within 0.9s1:37.909Bryce Cornet · fastest of 12 · top 5 within 1.3s124.1Melvin David Kemper Jr+0.393squal +1.925s100.4%qual 102.0%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+12.829squal +12.109s113.2%qual 112.7%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+17.762squal +18.682s118.2%qual 119.5%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:36.008David Pintaric · fastest of 17 · top 5 within 2.2s1:36.187Cliff Ebben · fastest of 16 · top 5 within 1.5s1:41.231Jarret Voorhies · fastest of 16 · top 5 within 1.7s1:41.146Jarret Voorhies · fastest of 16 · top 5 within 1.2s+4.959squal +5.223s105.2%qual 105.4%1:45.220James Jost · fastest of 29 · top 5 within 6.7s1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s+15.320squal +9.212s115.9%qual 109.6%1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s+22.913squal +22.298s123.8%qual 123.2%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:21.927Cliff Ebben · fastest of 8 · top 5 within 2.5s1:22.866Michael Lewis · fastest of 7 · top 5 within 2.1s1:26.043Jacob Loomis · fastest of 8 · top 5 within 3.1s1:27.922Jacob Loomis · fastest of 8 · top 5 within 2.7s+5.056squal +4.116s106.1%qual 105.0%1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s+10.558squal +8.724s112.7%qual 110.6%1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s+17.898squal +18.587s121.6%qual 122.7%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-211:44.244Michael Lewis · fastest of 11 · top 5 within 7.8s1:47.116Michael Lewis · fastest of 7 · top 5 within 8.3s1:57.804Joseph Burton-Harris · fastest of 10 · top 5 within 2.3s1:58.029Joseph Burton-Harris · fastest of 10 · top 5 within 1.7s+10.913squal +13.560s110.2%qual 113.0%2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s+15.806squal +17.502s114.8%qual 116.8%2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s+36.951squal +34.417s134.5%qual 133.0%

By track

TrackEvents Typical % of GT1 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 GT1'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.