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BoP Lab / Classes / AS

AS vs EP vs SM vs T1 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-SpecvsEP×FAFCFE2FFFPFVFXGT1GT2GTXHPPP2vsSM×SMXSRF3STLSTUvsT1×T2T3T4Show 51 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 · EP 96.5% of AS Glen McCready, Sonoma Raceway Runoffs 2018 race · SM 104.5% of AS Michael Carter, Sonoma Raceway Runoffs 2018 race · T1 91.6% of AS Kristofer Olson, Sonoma Raceway Runoffs 2018 race

1:402:002:202:4037 rule changes between Runoffs 2018 and Runoffs 201937 ▾45 rule changes between Runoffs 2019 and Runoffs 202045 ▾47 rule changes between Runoffs 2020 and Runoffs 202147 ▾42 rule changes between Runoffs 2021 and Runoffs 202242 ▾37 rule changes between Runoffs 2022 and Runoffs 202337 ▾42 rule changes between Runoffs 2023 and Runoffs 202442 ▾48 rule changes between Runoffs 2024 and Runoffs 202548 ▾48 rule changes between Runoffs 2025 and Runoffs 202648 ▾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)EP race best at Runoffs 2015: 2:05.109 (Kip Van Steenburg)EP race best at Runoffs 2016: 1:34.266 (Michael Galati)EP race best at Runoffs 2017: 1:50.396 (Matt Reynolds)EP race best at Runoffs 2018: 1:46.518 (Glen McCready)EP race best at Runoffs 2019: 2:01.631 (Jesse Prather)EP race best at Runoffs 2020: 2:29.047 (Jesse Prather)EP race best at Runoffs 2021: 1:49.928 (Jesse Prather)EP race best at Runoffs 2022: 2:30.855 (Jesse Prather)EP race best at Runoffs 2023: 2:04.050 (Greg Ira)EP race best at Runoffs 2024: 2:27.869 (Tyler Ladd)EP race best at Runoffs 2025: 2:28.756 (Tyler Ladd)EP race best at Runoffs 2026: 2:27.869 (Jon Brakke)EP qualifying best at Runoffs 2015: 2:03.794 (Kip Van Steenburg)EP qualifying best at Runoffs 2016: 1:33.847 (Michael Galati)EP qualifying best at Runoffs 2017: 1:49.597 (Matt Reynolds)EP qualifying best at Runoffs 2018: 1:45.828 (Glen McCready)EP qualifying best at Runoffs 2019: 2:00.987 (Jesse Prather)EP qualifying best at Runoffs 2020: 2:27.322 (Jesse Prather)EP qualifying best at Runoffs 2021: 1:48.181 (Jesse Prather)EP qualifying best at Runoffs 2022: 2:02.326 (Jesse Prather)EP qualifying best at Runoffs 2023: 2:03.215 (John Hainsworth)EP qualifying best at Runoffs 2024: 2:26.803 (Tyler Ladd)EP qualifying best at Runoffs 2025: 2:27.293 (Jon Brakke)EP qualifying best at Runoffs 2026: 2:29.239 (Jon Brakke)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)T1 race best at Runoffs 2015: 1:55.494 (Andrew Aquilante)T1 race best at Runoffs 2016: 1:29.309 (Ross Murray)T1 race best at Runoffs 2017: 1:42.871 (Andrew Aquilante)T1 race best at Runoffs 2018: 1:41.125 (Kristofer Olson)T1 race best at Runoffs 2019: 2:14.413 (Andrew Aquilante)T1 race best at Runoffs 2020: 2:18.701 (Mark Boden)T1 race best at Runoffs 2021: 1:43.752 (Mark Boden)T1 race best at Runoffs 2022: 2:16.067 (Andrew Aquilante)T1 race best at Runoffs 2023: 1:55.488 (Andrew Aquilante)T1 race best at Runoffs 2024: 2:16.131 (Andrew Aquilante)T1 race best at Runoffs 2025: 2:21.612 (Drew Delmonico)T1 qualifying best at Runoffs 2015: 1:53.562 (Andrew Aquilante)T1 qualifying best at Runoffs 2016: 1:28.656 (Ross Murray)T1 qualifying best at Runoffs 2017: 1:41.793 (Andrew Aquilante)T1 qualifying best at Runoffs 2018: 1:39.970 (Kristofer Olson)T1 qualifying best at Runoffs 2019: 1:54.771 (Andrew Aquilante)T1 qualifying best at Runoffs 2020: 2:17.646 (Andrew Aquilante)T1 qualifying best at Runoffs 2021: 1:42.292 (Andrew Aquilante)T1 qualifying best at Runoffs 2022: 1:54.890 (Andrew Aquilante)T1 qualifying best at Runoffs 2023: 1:54.520 (Andrew Aquilante)T1 qualifying best at Runoffs 2024: 2:16.578 (Andrew Aquilante)T1 qualifying best at Runoffs 2025: 2:20.677 (James Candelaria)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
ASEPSMT1solid race · dashed qualifying · slower is lower
95%100%105%110%37 rule changes between Runoffs 2018 and Runoffs 201937 ▾45 rule changes between Runoffs 2019 and Runoffs 202045 ▾47 rule changes between Runoffs 2020 and Runoffs 202147 ▾42 rule changes between Runoffs 2021 and Runoffs 202242 ▾37 rule changes between Runoffs 2022 and Runoffs 202337 ▾42 rule changes between Runoffs 2023 and Runoffs 202442 ▾48 rule changes between Runoffs 2024 and Runoffs 202548 ▾48 rule changes between Runoffs 2025 and Runoffs 202648 ▾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)EP race best at Runoffs 2015: 101.8% of AS's (Kip Van Steenburg)EP race best at Runoffs 2016: 100.9% of AS's (Michael Galati)EP race best at Runoffs 2017: 99.0% of AS's (Matt Reynolds)EP race best at Runoffs 2018: 96.5% of AS's (Glen McCready)EP race best at Runoffs 2019: 98.2% of AS's (Jesse Prather)EP race best at Runoffs 2020: 100.9% of AS's (Jesse Prather)EP race best at Runoffs 2021: 99.4% of AS's (Jesse Prather)Off the chart: EP race best at Runoffs 2022: 121.1% of AS's (Jesse Prather)EP race best at Runoffs 2023: 99.9% of AS's (Greg Ira)EP race best at Runoffs 2024: 101.0% of AS's (Tyler Ladd)EP race best at Runoffs 2025: 99.7% of AS's (Tyler Ladd)EP race best at Runoffs 2026: 99.6% of AS's (Jon Brakke)EP qualifying best at Runoffs 2015: 101.7% of AS's (Kip Van Steenburg)EP qualifying best at Runoffs 2016: 103.5% of AS's (Michael Galati)EP qualifying best at Runoffs 2017: 104.2% of AS's (Matt Reynolds)EP qualifying best at Runoffs 2018: 98.2% of AS's (Glen McCready)EP qualifying best at Runoffs 2019: 98.4% of AS's (Jesse Prather)EP qualifying best at Runoffs 2020: 100.2% of AS's (Jesse Prather)EP qualifying best at Runoffs 2021: 98.0% of AS's (Jesse Prather)EP qualifying best at Runoffs 2022: 100.1% of AS's (Jesse Prather)EP qualifying best at Runoffs 2023: 100.1% of AS's (John Hainsworth)EP qualifying best at Runoffs 2024: 100.2% of AS's (Tyler Ladd)EP qualifying best at Runoffs 2025: 100.3% of AS's (Jon Brakke)EP qualifying best at Runoffs 2026: 101.6% of AS's (Jon Brakke)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)T1 race best at Runoffs 2015: 94.0% of AS's (Andrew Aquilante)T1 race best at Runoffs 2016: 95.6% of AS's (Ross Murray)T1 race best at Runoffs 2017: 92.3% of AS's (Andrew Aquilante)T1 race best at Runoffs 2018: 91.6% of AS's (Kristofer Olson)T1 race best at Runoffs 2019: 108.5% of AS's (Andrew Aquilante)T1 race best at Runoffs 2020: 93.9% of AS's (Mark Boden)T1 race best at Runoffs 2021: 93.8% of AS's (Mark Boden)T1 race best at Runoffs 2022: 109.2% of AS's (Andrew Aquilante)T1 race best at Runoffs 2023: 93.0% of AS's (Andrew Aquilante)T1 race best at Runoffs 2024: 93.0% of AS's (Andrew Aquilante)T1 race best at Runoffs 2025: 94.9% of AS's (Drew Delmonico)T1 qualifying best at Runoffs 2015: 93.3% of AS's (Andrew Aquilante)T1 qualifying best at Runoffs 2016: 97.8% of AS's (Ross Murray)T1 qualifying best at Runoffs 2017: 96.7% of AS's (Andrew Aquilante)T1 qualifying best at Runoffs 2018: 92.8% of AS's (Kristofer Olson)T1 qualifying best at Runoffs 2019: 93.4% of AS's (Andrew Aquilante)T1 qualifying best at Runoffs 2020: 93.6% of AS's (Andrew Aquilante)T1 qualifying best at Runoffs 2021: 92.6% of AS's (Andrew Aquilante)T1 qualifying best at Runoffs 2022: 94.0% of AS's (Andrew Aquilante)T1 qualifying best at Runoffs 2023: 93.0% of AS's (Andrew Aquilante)T1 qualifying best at Runoffs 2024: 93.2% of AS's (Andrew Aquilante)T1 qualifying best at Runoffs 2025: 95.8% of AS's (James Candelaria)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
ASEPSMT1solid 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
EventASEPSMT1
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%)2:29.239Jon Brakke · fastest of 15 · top 5 within 5.2s+1.946s (+1.32%)2:27.869Jon Brakke · fastest of 15 · top 5 within 5.2s-0.887s (-0.60%)137.0Jon Brakke-3.8 mph (-2.7%)-0.602squal +2.328s99.6%qual 101.6%2:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%)2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%)119.6Wyatt Couch+0.3 mph (+0.3%)+14.254squal +15.262s109.6%qual 110.4%
48 rule changes (AS: 13, EP: 21, SM: 2, T1: 12)14 weight · 9 induction · 7 engine · 5 tyres & wheels · 2 removed · 1 suspension & brakes · 4 wording · 6 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
  • EP Mini Cooper Compression Ratio #40517engine
  • EP 1996-2000 Honda Civic (CX, DX, VP, LX) with Engine Code D16Y7 #40322engine
  • EP 1275 Midget/Sprit Alternate intake manifold E/O #40370induction
  • EP HP Honda Civic (92-95) #40464weight -70 lbs
  • SM Rear Toe Link #40271other
  • T1 Tire Equality #40342tyres & wheels
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • EP Honda S2000 Hardtop #40138other
  • T1 Trunk Lid Wording #40177tyres & wheels
  • EP Miata track width - errors and omissions #39976wording
  • EP Triumph GT6 Spec Change. #40098induction
  • T1 Clarification on Request #39716 T1 (Spec Line #1139) #39924induction
  • T1 Mistake in Line 1430 #39958other
  • AS Header Information Update for EFI Engine Build Sheets #39886engine
  • AS Errors and Omissions #39933weight
  • SM Part Number Change Request #39914wording
  • T1 Spec line #1139 Restrictor Change Request #39922induction
  • AS Re-Organization of AS Spec lines for 2026 #39887removed
  • T1 Replace OEM Heat Exchanger (Intercooler) With Aftermarket #39542other
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • T1 LS1 into Corvette C6 Spec Line Request #39716weight
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • EP Request to Update E30 BMW Throttle Body Diameter Verbiage #39363induction
  • T1 additional T1 adjustment #39520induction
  • AS 1994 Mustang Spec Line Request #39104engine
  • EP TR2 Notes E&O #39180weight
  • EP Balance of Power #39187weight +50 lbs
  • T1 Keep S2000 Classification #39344other
  • T1 Correcting and updating T1 GT4 spec lines #39394weight
  • T1 BOP adjustments to non GT4 T1 cars #39406weight +100 lbs
  • T1 Remove T1 Spec Line #39407removed
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
  • EP Please Lower Weight of 280Z #38871weight -160 lbs
  • EP Miata Weight Adjustment Follow Up #38949weight -25 lbs
  • EP Weight Break for 1098 Midget / Sprite #38970weight -80 lbs
  • EP HP Volvo 142 spec omission #38994engine
  • EP HP Mini DOHC 1.6 #38996engine
  • EP Add to Rabbit description #39019wording
  • EP Clean-up 9.1.5.E.7e #39025suspension & brakes
  • EP Add TB size to Ford Mustang (94-98) Spec Line #39130induction
  • EP HP Plymouth Arrow spec omission #38995wording
  • EP Add Wheel Diameter to Appendix G #39008tyres & wheels
  • EP Add TB ID tolerance to general Prod rules #39009induction
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%)2:27.293Jon Brakke · fastest of 21 · top 5 within 2.1s+0.490s (+0.33%)2:28.756Tyler Ladd · fastest of 19 · top 5 within 1.9s+0.887s (+0.60%)140.8Jon Brakke+0.1 mph (+0.1%)-0.476squal +0.501s99.7%qual 100.3%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%2:20.677James Candelaria · fastest of 5 · top 5 within 5.9s+4.099s (+3.00%)2:21.612Drew Delmonico · fastest of 5 · top 5 within 11.8s+5.481s (+4.03%)163.6Drew Delmonico+5.7 mph (+3.6%)-7.620squal -6.115s94.9%qual 95.8%
48 rule changes (AS: 11, EP: 14, SM: 4, T1: 19)17 weight · 8 engine · 6 induction · 5 cars added · 4 tyres & wheels · 2 wording · 6 othershowhide
  • AS RE: Previous Letter 37695 Update #38245weight -75 lbs
  • EP BMW Z4 update #38490induction
  • EP EP Fiat 124 Spider Competition Adjustment Request #38498weight -50 lbs
  • AS Errors and Omissions #38234engine
  • EP Base Weight Adjustment for H-Production X1/9 Spec Lines #38255weight -50 lbs
  • SM SMX Data Submission - Penalties #38248other
  • SM SMX Penaly Clarification updated language #38337wording
  • 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
  • T1 Acceptance of Porsche 981 GT4 Clubsport into T1 #36664cars added
  • T1 Request to Restore T1 Honda S2000 to Proper Weights #37644weight -50 lbs
  • T1 DCT Transmission in E46 #37964other
  • T1 Reduce E92 M3 Minimum Weight to 3050 #38092weight
  • T1 Finalize Spec Line for T1 Darkhorse #38106weight
  • AS Flotek Head Plunge Cut Inconsistencies #37502other
  • AS Notes clean up #37693weight
  • EP Request for Classification of Chevrolet Spark #37755cars added
  • EP Request to Lower Ford Festiva Minimum Weight to 1600 LBS #37939weight -100 lbs
  • T1 Cadillac CT4-V Blackwing #38003cars added
  • AS Race memo #37902engine
  • EP Request Competition Adjustment to BMW Z3 2.5L #37120induction
  • EP Interpretation of Production Rules on Mirrors #37235other
  • EP Weight Reduction for Honda S2000 #37466weight
  • EP Mazda 1999 Miata 1.8L #37488weight -50 lbs
  • T1 Correct and make new T1 BOP adjustments. #37737weight +75 lbs
  • EP Effective date for Jan 2025 GCR updates #37654induction
  • T1 T1 Parity Compared to GT4 #37170weight +125 lbs
  • T1 Clarification of Request Approval #37273 #37399engine
  • T1 C8 Corvette Facts #37400weight -100 lbs
  • T1 Camaro Gen 5 Competitive Disadvantage #37440induction
  • T1 Tire Changes in the Rules for GT4 #37497tyres & wheels
  • 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
  • EP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line #37119weight -50 lbs
  • EP Triumph GT6 Adjustments #37112weight
  • SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
  • T1 Changes to T1 Tires for GT4 and Other Cars #35383tyres & wheels
  • T1 G82 M4 GT4 inclusion in T1 #35864cars added
  • T1 Alt. Clutch Allowance #36606engine
  • T1 BOP Changes Need Updates #36667weight -150 lbs
  • T1 Request Ford Performance Darkhorse R in T1 #37136cars added
  • T1 Car Mods for T1 Corvette under line item 1150 #37173tyres & wheels
  • T1 Increased Bore Throttle Bodies for E46 M3 S54 Engine #37273engine
  • EP 1275 HP Spridget Level 2 Only #36518other
  • EP NA Miata Track Width Correction #36902wording
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%)2:26.803Tyler Ladd · fastest of 16 · top 5 within 4.1s-0.519s (-0.35%)2:27.869Tyler Ladd · fastest of 16 · top 5 within 3.6s-1.178s (-0.79%)140.7Bill Miller-1.0 mph (-0.7%)+1.440squal +0.225s101.0%qual 100.2%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%2:16.578Andrew Aquilante · fastest of 8 · top 5 within 4.8s-1.068s (-0.78%)2:16.131Andrew Aquilante · fastest of 7 · top 5 within 4.0s-2.570s (-1.85%)157.9Andrew Aquilante-0.8 mph (-0.5%)-10.298squal -10.000s93.0%qual 93.2%
42 rule changes (AS: 11, EP: 14, SM: 4, T1: 13)14 cars added · 9 weight · 5 engine · 3 induction · 1 suspension & brakes · 1 tyres & wheels · 2 wording · 7 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
  • EP Errant entry in HP production line item #36231other
  • AS Request for Classification of 2018-2023 mustang In #35764cars added
  • EP NIssan 300ZX Z31 to EP #35830cars added
  • EP RX7 1993 and Up Request In EP Spec Lines, classify #36031cars added
  • EP Clean-up Multiple EP RX-8 Spec Lines In EP #36156wording
  • 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
  • T1 Please Expedite classing the C63 Mercedes #35987cars added
  • AS Restricted Prep Aftermarket Parts Request #35682other
  • AS Allowance of 11 #35824tyres & wheels
  • T1 Honda S2000 #35582cars added
  • 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
  • EP GCR Correction - Redundant HP Spec Lines #35623engine
  • T1 9.1.9.1 T1 new category item/ line 26 rule to expire Jan 1 2023 #35411cars added
  • EP Update 1988-1991 Civic to Match 1988-1991 CRX #35399weight
  • T1 C8 Corvette T1 Restrictor Plate Request #35213induction
  • T1 The Cars Have Expired #35379induction
  • EP Request to Review Z3 2.5 Spec Line #35073weight +50 lbs
  • EP Miata Alternate Head #35253weight -50 lbs
  • EP Triumph GT6 Adjustments #35255weight
  • EP Honda S2000 throttle body #35272induction
  • EP Correction within Triumph TR8 Spec Line #35315engine
  • EP Correction to EP 924S/944 Spec Line #35317weight
  • T1 GT4 batch adjustment in T1 #35162weight -85 lbs
  • T1 Remove T1 spec lines #35192other
  • EP Porsche 944/924S Rule Change Request #35002weight
  • EP Triumph GT6 Adjustments #35054weight -30 lbs
  • T1 New T1 add spec line for C5 corvette LS2 engines (Copy from C6) #33764engine
  • T1 C7 Corvette Rule Change Request #34897cars added
  • T1 Camaro Gen 5 Weight Reduction Due to Competitive Disadvantage #35092weight -75 lbs
  • T1 Addendum to Letter #35022: Drivetrain Rule #35105other
  • T1 2004 - 2006 Pontiac GTO Re-Integration Back Into T1 #34403cars added
  • T1 Request to Classify Porsche 997-1 GT3 Cup #34561cars 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%)2:03.215John Hainsworth · fastest of 24 · top 5 within 4.3s+0.889s (+0.73%)2:04.050Greg Ira · fastest of 22 · top 5 within 5.3s-26.805s (-17.77%)144.6Greg Ira+3.1 mph (+2.2%)-0.070squal +0.133s99.9%qual 100.1%2:14.986Danny Steyn · fastest of 52 · top 5 within 0.1s+0.322s (+0.24%)2:16.229Julian DaCosta · fastest of 46 · top 5 within 0.3s-2.878s (-2.07%)120.3Jim Drago+1.1 mph (+0.9%)+12.109squal +11.904s109.8%qual 109.7%1:54.520Andrew Aquilante · fastest of 12 · top 5 within 3.7s-0.370s (-0.32%)1:55.488Andrew Aquilante · fastest of 12 · top 5 within 2.7s-20.579s (-15.12%)159.2James Candelaria+1.6 mph (+1.0%)-8.632squal -8.562s93.0%qual 93.0%
37 rule changes (AS: 4, EP: 13, SM: 1, T1: 19)7 engine · 6 weight · 5 induction · 3 cars added · 3 suspension & brakes · 3 tyres & wheels · 1 aero · 1 removed · 3 wording · 5 othershowhide
  • EP Hub Note Clean Up In EP TR8 Spec Line #34649wording
  • EP Triumph GT6 Adjustments #34662other
  • EP Triumph GT6 Adjustments: Brakes #34663suspension & brakes
  • 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
  • T1 Why no Camaro? #34421cars added
  • T1 Request to Remove Expiration from T1 spec lines #1350 & #1370 #34470other
  • T1 Remove #34475other
  • T1 Error in T1 GT4 numbering scheme- #34578wording
  • T1 C5 Approved Aero That Was Mistakenly Deleted #34374aero
  • EP Correct Intake Valve Size on 1500cc Midget/Spitfire #34419induction
  • T1 Viper Cleanup #34107induction
  • T1 Viper 8300 OEM FPR Size #34268induction
  • T1 Ford Mustang S197 (05-14) Clarification #34450wording
  • T1 Gen 5 Camaro Engine #33875engine
  • T1 Inquiry to letter #33682 #34071engine
  • EP 914-6 Valve Size Correction #34185engine
  • T1 Request to reinstate T1 S197 Mustang #34048cars added
  • T1 T1 GT4 adjustments #33786other
  • T1 Touring 1 Tire Sizes #34191tyres & wheels
  • EP Investigate Parity of Z3 #33343induction
  • T1 Clarification for Camaro Gen5 2010-2015 #33739cars added
  • T1 Sequential Gearbox Limitations in T1 #33691weight
  • T1 T1 GT4 adjustments #33786weight
  • T1 Sunset of pre 2023 Touring 1 Rules. #33916removed
  • T1 Corrections to T1 Spec Lines #33678tyres & wheels
  • EP Revise 79-85 RX7 Brake Spec Line Allowance #33293suspension & brakes
  • EP Request alternate carburetors for EP 280z #33405engine
  • EP Fuel Injection 12a Mazda RX3 #33434engine
  • EP Mazda RX3 - Weight Reduction #33436weight -50 lbs
  • EP Request TR8 Dry Sump Allowance #33460other
  • EP Review Limited Prep Port Matching Rules #33600induction
  • EP 280ZX Classification Request #33611weight
  • SM BOP for NB1 and NB2 #32309weight
  • T1 GT4 section to Current T1 Rules. #33632weight
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%)2:02.326Jesse Prather · fastest of 17 · top 5 within 3.2s+1.339s (+1.11%)2:30.855Jesse Prather · fastest of 15 · top 5 within 2.5s+29.224s (+24.03%)141.5Jesse Prather-6.0 mph (-4.1%)+26.277squal +0.164s121.1%qual 100.1%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%1:54.890Andrew Aquilante · fastest of 10 · top 5 within 3.2s+0.119s (+0.10%)2:16.067Andrew Aquilante · fastest of 8 · top 5 within 15.9s+1.654s (+1.23%)157.5Mark Boden+1.3 mph (+0.8%)+11.489squal -7.272s109.2%qual 94.0%
42 rule changes (AS: 9, EP: 21, SM: 1, T1: 11)10 weight · 7 induction · 5 cars added · 5 engine · 3 suspension & brakes · 2 tyres & wheels · 4 wording · 6 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • EP Request to classify VW New Beetle 2.5L in EP #32725cars added
  • EP Request Rotary Injection on Dual Y manifold #32775engine
  • EP Request for Corrado Stroke & Displacement Correction #32985engine
  • T1 Correct Camaro Spec Line From Letter #30791 response to 3475lbs #32824weight -25 lbs
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • EP Subaru BRZ Model Years #32500other
  • T1 Fix FP350S limited prep and Shelby 350 full prep issues #31680induction
  • T1 Request to Classify AMG GT4 #32610cars added
  • EP EP MX-5 Global Cup Car #32218weight
  • EP Please Class BMW 128i in EP #32370cars added
  • EP Inconsistency in Body Work Descriptions #32396other
  • EP Mazda RX8 with 13b Rotary #32170induction
  • EP Request Idle control valve clarification #32178engine
  • SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
  • T1 Viper/Z06 Parity #31942weight -50 lbs
  • T1 Discrepancy in T1 allowances #32293other
  • T1 T1 RX7 classification #32352cars added
  • EP EP Adjustments #31858induction
  • EP 1999 3.8L Ford Mustang to EP? #31635weight
  • EP Improved Touring Tires #32064tyres & wheels
  • T1 Weight reduction E&O #30791weight -25 lbs
  • T1 Performance Adjustment Request for Camaro #31521weight -50 lbs
  • T1 Remove 33m Brake rotor thickness rule #31954suspension & brakes
  • EP Throttle Body and Idle Air #31800induction
  • EP Porsche 968 Engine Questions #31831engine
  • EP Request weight reduction for 1979-1985 Mazda RX-7 #31833weight
  • 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
  • EP Porsche 968 Engine Questions #31478induction
  • EP PCS E. 2. n. 4. Add Axle Shaft to Allow FWD the Same Freedom #31592tyres & wheels
  • EP BMW Z3 2.5L Spec Line #31724induction
  • EP 944S2 Restrictor #31396induction
  • EP Classing Clarification for 1986 Toyota Corolla FX16 #31527cars added
  • T1 Turbo Miata Help #31315weight +200 lbs
  • T1 Fix the T1 Corvette heading #31528wording
  • AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other
  • AS Request Pontiac GTO tire size change #30881weight
  • EP E&O; MR2 Track #31120wording
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 Jost1:48.181Jesse Prather · fastest of 31 · top 5 within 3.2s-1.416s (-1.29%)1:49.928Jesse Prather · fastest of 27 · top 5 within 0.9s-0.468s (-0.42%)143.4Jon Brakke-0.678squal -2.246s99.4%qual 98.0%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%1:42.292Andrew Aquilante · fastest of 22 · top 5 within 1.3s+0.499s (+0.49%)1:43.752Mark Boden · fastest of 22 · top 5 within 1.0s+0.881s (+0.86%)159.2Mark Boden-6.854squal -8.135s93.8%qual 92.6%
47 rule changes (AS: 14, EP: 14, SM: 1, T1: 18)14 weight · 10 cars added · 8 engine · 3 suspension & brakes · 2 induction · 1 aero · 4 wording · 5 othershowhide
  • EP Request to Allow F22c Engine for 2000-2003 Honda S2000 #30548engine
  • EP Request a review of the S14 240SX in EP. #30873weight -200 lbs
  • T1 T1 E46 BOP E&O for Letter # 29970 #30934weight +100 lbs
  • EP Lotus/Caterham 7 America Request #30392engine
  • EP Reclassify Daimler SP 250 #30721cars added
  • T1 Request BoP for the Viper in 1 LP #29968other
  • T1 LS6 Alternative Head Question #30074engine
  • 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
  • EP Clarify Application of Percentage Based Weight Penalties #30669weight
  • T1 T1-LP - Add Performance Pack, Bullet, Mach 1 to 18+ Mustang #29849induction
  • T1 Request BoP for the Viper in 1 LP #29968other
  • T1 Request to classify C7 and 13Viper in T1 LP #29969cars added
  • T1 Request LP Z06 steel chassis #30589other
  • EP Change Classification of 84-87 Mazda 626 from FP to HP #30350cars added
  • EP Fiat X1/9 brake rotors #30423suspension & brakes
  • EP NC MX-5 year range correction E&O #30503wording
  • T1 Request For Reduction in Weight/Penalties for Camaro #30443weight
  • T1 Fix dry sump Contradictions in T1-LP vs T2 #30596suspension & brakes
  • EP Please Classify Mazda3 in FP #30165cars added
  • 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
  • T1 T1 LP Aero adjustments #30196aero
  • T1 Request to Clarify Miller Mustang Classification #28728engine
  • T1 BMW E46 Carbon Dash #29806engine
  • T1 Request to Update T1 Mustang Spec Line #30001other
  • T1 Dodge Viper 8400 OEM??? #30174cars added
  • T1 Class BMW M2CS Club Sport #30195cars added
  • T1 997.1 GT3 Cup #30229cars added
  • 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
  • EP Alternate Front Brake Rotors and Calipers for EP AH 3000 #29893suspension & brakes
  • T1 Correct T1 Limited Prep Years #29708wording
  • AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine
  • AS Rule simplification spec line communization #29824weight
  • EP Mk2 VW Consistency and Cleanup of FP and HP Spec Lines #29195weight -50 lbs
  • EP Correct Wording for Level 1 and Level 2 Induction Systems #29406induction
  • EP Weight Reduction for Datsun Roadster #29409weight -75 lbs
  • EP EP TR8 Adjustment #29512weight -100 lbs
  • T1 Changes to Corvette C8 #29898weight -100 lbs
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 Eaton2:27.322Jesse Prather · fastest of 20 · top 5 within 2.5s2:29.047Jesse Prather · fastest of 20 · top 5 within 2.8s141.7Jesse Prather+1.379squal +0.277s100.9%qual 100.2%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%2:17.646Andrew Aquilante · fastest of 15 · top 5 within 3.7s2:18.701Mark Boden · fastest of 14 · top 5 within 3.0s158.8James Candelaria-8.967squal -9.399s93.9%qual 93.6%
45 rule changes (AS: 16, EP: 14, SM: 2, T1: 13)9 engine · 8 induction · 7 suspension & brakes · 5 cars added · 4 aero · 4 tyres & wheels · 4 weight · 2 wording · 2 othershowhide
  • EP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O #29458tyres & wheels
  • SM Radiator E&O Clarifications #29294engine
  • AS Dodge Challenger AS Spec Line Clarification #28698induction
  • AS Dodge Challenger AS Spec Line Clarification #2 #28699aero
  • EP EP BMW Z3 Rule Clarification #28998engine
  • SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes
  • T1 Touring Gurney flap wicker clarification #29013aero
  • 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
  • EP Request to Classify Porsche 911 2.0L #28456cars added
  • EP BMW Cylinder Head Casting and Part Numbers #28708engine
  • T1 Consider coil spring conversion Corvette in T2 #28824suspension & brakes
  • AS weight adjustments for 2020 season #28785weight -50 lbs
  • EP Request to Classify 1990-1994 Mazda Protege #28381cars added
  • EP Error in Mini Cooper Spec Line #28713wording
  • T1 Additional Clarification on 996 Cup in T1 From Letter #28040 #28060wording
  • T1 Request SPEC Corvette Rear Spolier #28182aero
  • T1 T1 Rear Brake Rotor Size Exemption for Gen 5 Camaro #28402suspension & brakes
  • EP Caterham 7 Spec Line #28498engine
  • T1 Request 996 GT3 Trunk for Wing Allowance. #28153aero
  • T1 All Touring, Change DOT Tire Language 9.1.9.1, 9.3.45 #28452tyres & wheels
  • EP Request to Review Horsepower Parity #27662induction
  • EP E36 (92-95) Brakes Errors and Omissions #28058suspension & brakes
  • EP Request to allow 40 DCOE carb for the Datsun 510 #28195induction
  • EP Add Throttle Body Size these EP BMW Spec Lines #28422induction
  • T1 Request for E46 wagon with S54 engine in T1 #27427engine
  • 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
  • EP Request for Help for Datsun 1200 #27934induction
  • T1 Request to include Subaru WRX/STI 02-18 in T1 #24916induction
  • T1 Request Ford Mustang FP350S T1-LP weight and restrictor change #26662weight +100 lbs
  • T1 Request to classify Ford Coyote 3rd Gen OEM #27145cars added
  • T1 Request alternate dashboard #27276weight
  • T1 Request for Allowance of Coil Springs on Limited Prep C6 Corvette #27713suspension & brakes
  • EP Request to List Mazda Miata Throttle Body Size #27907induction
  • EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661engine
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 Jost2:00.987Jesse Prather · fastest of 29 · top 5 within 2.2s2:01.631Jesse Prather · fastest of 24 · top 5 within 1.4s147.5Kip Van Steenburg-2.269squal -1.951s98.2%qual 98.4%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+12.559squal +11.614s110.1%qual 109.4%1:54.771Andrew Aquilante · fastest of 19 · top 5 within 3.1s2:14.413Andrew Aquilante · fastest of 15 · top 5 within 4.8s156.2Mark Boden+10.513squal -8.167s108.5%qual 93.4%
37 rule changes (AS: 4, EP: 10, SM: 4, T1: 19)9 weight · 8 cars added · 4 suspension & brakes · 3 induction · 3 tyres & wheels · 2 engine · 1 aero · 3 wording · 4 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • EP Request bodywork for Austin Healey Bugeye Sprite MK1 #27106other
  • EP Request to classify the GMX5 2019 #27263cars added
  • EP level one susp. component rule #27270suspension & brakes
  • EP Clarification of Carb Rules - Prep 1 #27300induction
  • EP Clarification of Carb Rules - Prep 2 #27301induction
  • T1 T1 LP 2016 Camaro and Later #27198weight -100 lbs
  • AS Request Ride Height Clarification #26598suspension & brakes
  • EP Request Miata Eligibility - 2003 #27121other
  • T1 Request to return Ford Mustang Challenge Car to T1 #26751cars added
  • T1 Correct years in T1 FP Corvette spec #27023wording
  • T1 Request BoP Baten - T1 Camaro - Follow up to Letter # 26145 #26900induction
  • AS Request to Revert to 2017 Weights #25885weight
  • T1 Clarify DOT tires touring #26556tyres & wheels
  • EP Allow Firewall Modification for Fitment of 13B into RX8 #26726engine
  • T1 Request to Classify EcoBoost Mustang #25841cars added
  • T1 Request Corvette aerodynamic aids #26265aero
  • T1 Audi TTRS VTS Documentation Revision #26578other
  • T1 Request Ride Height Clarification #26599suspension & brakes
  • T1 Opposes Unfair weight and throttle restrictor #26719weight -300 lbs
  • EP Rollcenter Correction Clarification #25873tyres & wheels
  • EP Hardtops #26476wording
  • T1 Request to classify the Porsche 928GTS/S4 in Touring 1 #26315cars added
  • EP Request for Competition Adjustment for 2nd Generation RX7 #25935weight -50 lbs
  • SM Request to allow aftermarket fuel filters. #26370wording
  • T1 Request Mustang GT Limited Prep 2018 Classification #24431cars added
  • 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
  • T1 Class 2015+ Mustang GT350(R) #21466weight
  • T1 Request to Classify Ford FP350S in T1-LP #25341cars added
  • T1 Amendment to Request #25555 #25556suspension & brakes
  • T1 Request to balance 996 v 997 T1 weight #25658weight
  • T1 Request to Add PDK Transmission to 997 Porsche Spec Line #25668cars added
  • T1 T1 World Challenge/Grand AM Spec Cars #25687weight
  • T1 Add Clarification to Spec Car Classifications Vehicle Spec #25774weight
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 Fandozzi1:45.828Glen McCready · fastest of 18 · top 5 within 4.3s1:46.518Glen McCready · fastest of 16 · top 5 within 2.8s106.5Aaron Downey-3.827squal -1.954s96.5%qual 98.2%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%1:39.970Kristofer Olson · fastest of 16 · top 5 within 3.8s1:41.125Kristofer Olson · fastest of 15 · top 5 within 3.0s108.6Brad McCall-9.220squal -7.812s91.6%qual 92.8%
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 0.9s1:49.597Matt Reynolds · fastest of 44 · top 5 within 1.2s1:50.396Matt Reynolds · fastest of 45 · top 5 within 0.5s-1.111squal +4.377s99.0%qual 104.2%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%1:41.793Andrew Aquilante · fastest of 22 · top 5 within 2.9s1:42.871Andrew Aquilante · fastest of 21 · top 5 within 2.9s-8.636squal -3.427s92.3%qual 96.7%
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 1.0s1:33.847Michael Galati · fastest of 25 · top 5 within 0.8s1:34.266Michael Galati · fastest of 23 · top 5 within 1.3s+0.842squal +3.196s100.9%qual 103.5%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%1:28.656Ross Murray · fastest of 17 · top 5 within 1.4s1:29.309Ross Murray · fastest of 15 · top 5 within 1.1s-4.115squal -1.995s95.6%qual 97.8%
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 2.2s2:03.794Kip Van Steenburg · fastest of 29 · top 5 within 3.2s2:05.109Kip Van Steenburg · fastest of 28 · top 5 within 3.3s+2.187squal +2.048s101.8%qual 101.7%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%1:53.562Andrew Aquilante · fastest of 12 · top 5 within 2.5s1:55.494Andrew Aquilante · fastest of 12 · top 5 within 2.1s-7.428squal -8.184s94.0%qual 93.3%

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.