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BoP Lab / Classes / AS

AS vs F5 vs STU vs GTL 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-SpecEPvsF5×FAFCFE2FFFPFVFXGT1GT2vsGTL×GTXHPPP2SMSMXSRF3STLvsSTU×T1T2T3T4Show 49 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 · F5 92.2% of AS Wiley Clinton McMahan, Indianapolis Motor Speedway Runoffs 2017 race · STU 73.5% of AS Franklin Church, Sonoma Raceway Runoffs 2018 qualifying · GTL 99.2% of AS Troy Ermish, Sonoma Raceway Runoffs 2018 race

1:402:002:2040 rule changes between Runoffs 2018 and Runoffs 201940 ▾56 rule changes between Runoffs 2019 and Runoffs 202056 ▾37 rule changes between Runoffs 2020 and Runoffs 202137 ▾39 rule changes between Runoffs 2021 and Runoffs 202239 ▾14 rule changes between Runoffs 2022 and Runoffs 202314 ▾31 rule changes between Runoffs 2023 and Runoffs 202431 ▾32 rule changes between Runoffs 2024 and Runoffs 202532 ▾29 rule changes between Runoffs 2025 and Runoffs 202629 ▾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)F5 race best at Runoffs 2015: 2:03.298 (Matthew Strand)F5 race best at Runoffs 2016: 1:29.853 (Steven Thompson)F5 race best at Runoffs 2017: 1:42.860 (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 1:42.491 (David Lapham)F5 race best at Runoffs 2019: 1:57.572 (Wiley Mcmahan)F5 race best at Runoffs 2020: 2:21.391 (James Weida)F5 race best at Runoffs 2021: 1:43.140 (Sven de Vries)F5 race best at Runoffs 2022: 2:21.862 (Sven de Vries)F5 qualifying best at Runoffs 2015: 2:01.824 (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 1:28.528 (Calvin Stewart)F5 qualifying best at Runoffs 2017: 1:43.136 (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 1:41.807 (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 1:57.361 (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 2:20.954 (Calvin Stewart)F5 qualifying best at Runoffs 2021: 1:42.619 (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 1:57.689 (James Weida)STU race best at Runoffs 2015: 2:06.756 (Eric Heinrich)STU race best at Runoffs 2016: 1:34.597 (Cameron Maugeri)STU race best at Runoffs 2017: 1:49.387 (Rob Huffmaster)STU race best at Runoffs 2018: 1:46.514 (Kevin Boehm)STU race best at Runoffs 2019: 2:00.483 (Kevin Boehm)STU race best at Runoffs 2020: 2:28.410 (Anthony Geraci)STU race best at Runoffs 2021: 1:47.441 (Joe Moser)STU race best at Runoffs 2022: 2:32.357 (Mark Liller)STU race best at Runoffs 2023: 2:02.302 (Mark Liller)STU race best at Runoffs 2024: 2:25.824 (Thomas Noble)STU race best at Runoffs 2025: 2:24.497 (Chip Herr)STU race best at Runoffs 2026: 2:26.416 (Richard Astacio)STU qualifying best at Runoffs 2015: 2:05.494 (Eric Heinrich)STU qualifying best at Runoffs 2016: 1:32.738 (Joe Moser)STU qualifying best at Runoffs 2017: 1:48.921 (Rob Huffmaster)Off the chart: STU qualifying best at Runoffs 2018: 1:19.234 (Franklin Church)STU qualifying best at Runoffs 2019: 1:59.948 (Kevin Boehm)STU qualifying best at Runoffs 2020: 2:27.883 (David Fiorelli)STU qualifying best at Runoffs 2021: 1:47.078 (Joe Moser)STU qualifying best at Runoffs 2022: 2:00.615 (Johan Schwartz)STU qualifying best at Runoffs 2023: 2:00.389 (Johan Schwartz)STU qualifying best at Runoffs 2024: 2:26.227 (Thomas Noble)STU qualifying best at Runoffs 2025: 2:23.083 (Peter Cunningham)STU qualifying best at Runoffs 2026: 2:24.912 (Richard Astacio)GTL race best at Runoffs 2015: 2:13.564 (Jim Dentici)GTL race best at Runoffs 2016: 1:35.912 (Kyle Disque)GTL race best at Runoffs 2017: 1:52.068 (Christopher Bovis)GTL race best at Runoffs 2018: 1:49.458 (Troy Ermish)GTL race best at Runoffs 2019: 2:07.837 (Bill Ball)GTL race best at Runoffs 2020: 2:31.601 (Peter Shadowen)GTL race best at Runoffs 2021: 1:51.952 (Scott Twomey)GTL race best at Runoffs 2022: 2:21.180 (Michael Lewis)GTL race best at Runoffs 2023: 2:11.277 (Graham Fuller)GTL race best at Runoffs 2024: 2:30.844 (Chris Bovis)GTL qualifying best at Runoffs 2015: 2:11.387 (Jim Dentici)GTL qualifying best at Runoffs 2016: 1:35.377 (Wilson Wright)GTL qualifying best at Runoffs 2017: 1:50.331 (Christopher Bovis)GTL qualifying best at Runoffs 2018: 1:47.885 (Troy Ermish)GTL qualifying best at Runoffs 2019: 2:06.997 (Peter Shadowen)GTL qualifying best at Runoffs 2020: 2:31.943 (Chris Bovis)GTL qualifying best at Runoffs 2021: 1:51.819 (Christopher Bovis)GTL qualifying best at Runoffs 2022: 2:07.789 (Peter Shadowen)GTL qualifying best at Runoffs 2023: 2:09.564 (Peter Shadowen)GTL qualifying best at Runoffs 2024: 2:30.858 (Peter Shadowen)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
ASF5STUGTLsolid race · dashed qualifying · slower is lower
95%100%105%110%115%40 rule changes between Runoffs 2018 and Runoffs 201940 ▾56 rule changes between Runoffs 2019 and Runoffs 202056 ▾37 rule changes between Runoffs 2020 and Runoffs 202137 ▾39 rule changes between Runoffs 2021 and Runoffs 202239 ▾14 rule changes between Runoffs 2022 and Runoffs 202314 ▾31 rule changes between Runoffs 2023 and Runoffs 202431 ▾32 rule changes between Runoffs 2024 and Runoffs 202532 ▾29 rule changes between Runoffs 2025 and Runoffs 202629 ▾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)F5 race best at Runoffs 2015: 100.3% of AS's (Matthew Strand)F5 race best at Runoffs 2016: 96.2% of AS's (Steven Thompson)F5 race best at Runoffs 2017: 92.2% of AS's (Wiley Clinton McMahan)F5 race best at Runoffs 2018: 92.9% of AS's (David Lapham)F5 race best at Runoffs 2019: 94.9% of AS's (Wiley Mcmahan)F5 race best at Runoffs 2020: 95.7% of AS's (James Weida)F5 race best at Runoffs 2021: 93.2% of AS's (Sven de Vries)F5 race best at Runoffs 2022: 113.9% of AS's (Sven de Vries)F5 qualifying best at Runoffs 2015: 100.1% of AS's (W. Clint McMahan)F5 qualifying best at Runoffs 2016: 97.7% of AS's (Calvin Stewart)F5 qualifying best at Runoffs 2017: 98.0% of AS's (Wiley Clinton McMahan)F5 qualifying best at Runoffs 2018: 94.5% of AS's (Jeff Jorgenson)F5 qualifying best at Runoffs 2019: 95.5% of AS's (Wiley Mcmahan)F5 qualifying best at Runoffs 2020: 95.9% of AS's (Calvin Stewart)F5 qualifying best at Runoffs 2021: 92.9% of AS's (Ryan Mayfield)F5 qualifying best at Runoffs 2022: 96.3% of AS's (James Weida)STU race best at Runoffs 2015: 103.1% of AS's (Eric Heinrich)STU race best at Runoffs 2016: 101.3% of AS's (Cameron Maugeri)STU race best at Runoffs 2017: 98.1% of AS's (Rob Huffmaster)STU race best at Runoffs 2018: 96.5% of AS's (Kevin Boehm)STU race best at Runoffs 2019: 97.2% of AS's (Kevin Boehm)STU race best at Runoffs 2020: 100.5% of AS's (Anthony Geraci)STU race best at Runoffs 2021: 97.1% of AS's (Joe Moser)Off the chart: STU race best at Runoffs 2022: 122.3% of AS's (Mark Liller)STU race best at Runoffs 2023: 98.5% of AS's (Mark Liller)STU race best at Runoffs 2024: 99.6% of AS's (Thomas Noble)STU race best at Runoffs 2025: 96.8% of AS's (Chip Herr)STU race best at Runoffs 2026: 98.6% of AS's (Richard Astacio)STU qualifying best at Runoffs 2015: 103.1% of AS's (Eric Heinrich)STU qualifying best at Runoffs 2016: 102.3% of AS's (Joe Moser)STU qualifying best at Runoffs 2017: 103.5% of AS's (Rob Huffmaster)Off the chart: STU qualifying best at Runoffs 2018: 73.5% of AS's (Franklin Church)STU qualifying best at Runoffs 2019: 97.6% of AS's (Kevin Boehm)STU qualifying best at Runoffs 2020: 100.6% of AS's (David Fiorelli)STU qualifying best at Runoffs 2021: 97.0% of AS's (Joe Moser)STU qualifying best at Runoffs 2022: 98.7% of AS's (Johan Schwartz)STU qualifying best at Runoffs 2023: 97.8% of AS's (Johan Schwartz)STU qualifying best at Runoffs 2024: 99.8% of AS's (Thomas Noble)STU qualifying best at Runoffs 2025: 97.5% of AS's (Peter Cunningham)STU qualifying best at Runoffs 2026: 98.6% of AS's (Richard Astacio)GTL race best at Runoffs 2015: 108.7% of AS's (Jim Dentici)GTL race best at Runoffs 2016: 102.7% of AS's (Kyle Disque)GTL race best at Runoffs 2017: 100.5% of AS's (Christopher Bovis)GTL race best at Runoffs 2018: 99.2% of AS's (Troy Ermish)GTL race best at Runoffs 2019: 103.2% of AS's (Bill Ball)GTL race best at Runoffs 2020: 102.7% of AS's (Peter Shadowen)GTL race best at Runoffs 2021: 101.2% of AS's (Scott Twomey)GTL race best at Runoffs 2022: 113.3% of AS's (Michael Lewis)GTL race best at Runoffs 2023: 105.8% of AS's (Graham Fuller)GTL race best at Runoffs 2024: 103.0% of AS's (Chris Bovis)GTL qualifying best at Runoffs 2015: 107.9% of AS's (Jim Dentici)GTL qualifying best at Runoffs 2016: 105.2% of AS's (Wilson Wright)GTL qualifying best at Runoffs 2017: 104.9% of AS's (Christopher Bovis)GTL qualifying best at Runoffs 2018: 100.1% of AS's (Troy Ermish)GTL qualifying best at Runoffs 2019: 103.3% of AS's (Peter Shadowen)GTL qualifying best at Runoffs 2020: 103.3% of AS's (Chris Bovis)GTL qualifying best at Runoffs 2021: 101.3% of AS's (Christopher Bovis)GTL qualifying best at Runoffs 2022: 104.6% of AS's (Peter Shadowen)GTL qualifying best at Runoffs 2023: 105.3% of AS's (Peter Shadowen)GTL qualifying best at Runoffs 2024: 102.9% of AS's (Peter Shadowen)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
ASF5STUGTLsolid 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
EventASF5STUGTL
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%)2:24.912Richard Astacio · fastest of 17 · top 5 within 2.6s+1.829s (+1.28%)2:26.416Richard Astacio · fastest of 16 · top 5 within 1.5s+1.919s (+1.33%)145.1Hugh Stewart+0.8 mph (+0.5%)-2.055squal -1.999s98.6%qual 98.6%
29 rule changes (AS: 13, STU: 15, GTL: 1)12 weight · 5 induction · 5 tyres & wheels · 4 engine · 2 removed · 1 othershowhide
  • AS 2016+ Camaro Spec Line Full Prep #39646tyres & wheels
  • AS Consideration of Pirelli P Zero Trofeo Track for AS Competition #40495tyres & wheels
  • STU Wheel and tire requirements for GT3U #40679tyres & 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
  • STU 9” Wheels #40433tyres & wheels
  • STU Weight adjustment to former GT3U cars #40474weight
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • STU Request to allow BMW M50B20TU engine in STU #40202engine
  • STU Calculating Weight #40224weight
  • STU Turbo Restrictor Size Increase Request #40008induction
  • STU GT86 Cups Car in STU #40028weight
  • AS Header Information Update for EFI Engine Build Sheets #39886engine
  • AS Errors and Omissions #39933weight
  • STU Mazda Rx-8 Renesis - Streetported Variant & Added Weight #39785weight
  • STU Eliminate 33 and 34 mm TIRs #39872weight
  • AS Re-Organization of AS Spec lines for 2026 #39887removed
  • GTL Remove GT3U from GCR as it is now in STU #39862removed
  • STU Fab 9 Racing Intake Manifold in STU #39767induction
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • STU Request for Permission on Aftermarket Turbo Kit and Intake #39529induction
  • AS 1994 Mustang Spec Line Request #39104engine
  • STU Turbo Inlet Restrictor Table #38961induction
  • STU 275 Tire Rule #38983tyres & wheels
  • STU STU Honda Engine weight penalty #39375weight
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
  • STU Non-Homologated Engine Swaps - Specifically K24A2 w/ Honda CRZ #38746weight
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%)2:23.083Peter Cunningham · fastest of 16 · top 5 within 2.6s-3.144s (-2.15%)2:24.497Chip Herr · fastest of 15 · top 5 within 3.8s-1.327s (-0.91%)144.3Chip Herr-1.0 mph (-0.7%)-4.735squal -3.709s96.8%qual 97.5%
32 rule changes (AS: 11, STU: 18, GTL: 3)11 weight · 9 engine · 3 induction · 3 tyres & wheels · 1 aero · 1 cars added · 1 wording · 3 othershowhide
  • STU Lotus Weight Reduction E&O #38919weight
  • STU STU-TCR Adjustments #38723weight
  • STU Lotus Weight Reduction #38772weight -50 lbs
  • AS RE: Previous Letter 37695 Update #38245weight -75 lbs
  • STU 2.8-3.2L N/A Engine Allowances #38007engine
  • STU 2006-2015 Mazda Miata Intake Manifold #38422induction
  • STU Requesting Approval of the JDM Honda h23a #38489cars added
  • AS Errors and Omissions #38234engine
  • AS Errors and Omission #38055induction
  • AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO #38197engine
  • STU Wheel Size Inconsistency #38018tyres & wheels
  • STU Table C: STU-GT3U Clarification #38268weight
  • AS Flotek Head Plunge Cut Inconsistencies #37502other
  • AS Notes clean up #37693weight
  • AS Race memo #37902engine
  • STU BMW N54/N55 Engine Allowance Follow Up #37447engine
  • STU STU Mini Cooper pulley size clarification re: letter #36980 #37717wording
  • STU Question About a Weight Modifier #37782weight
  • STU Increase Minimum Weight #37919weight +100 lbs
  • 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
  • GTL Correct language regarding OEM Areo Devices #37137aero
  • STU Audi 1.8t Wagon STU Table B #36685weight
  • STU Merger GT3 to STU #37486other
  • STU GT3 TCR Tire allowance #37494tyres & wheels
  • STU Request to Remove Miata Hubs from General category #37138tyres & wheels
  • STU BMW N54/N55 Engine Allowance #37146engine
  • GTL G16E-GTS Fuel Injection Spec Line Change #36588engine
  • GTL GTL Alternate Weight and Choke Option for L16 engine #36653weight
  • STU R53 15% Pulley Request #36980other
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%)2:26.227Thomas Noble · fastest of 18 · top 5 within 2.3s-1.656s (-1.12%)2:25.824Thomas Noble · fastest of 17 · top 5 within 2.4s-2.586s (-1.74%)145.3Thomas Noble+1.1 mph (+0.8%)-0.605squal -0.351s99.6%qual 99.8%2:30.858Peter Shadowen · fastest of 14 · top 5 within 4.4s-1.085s (-0.71%)2:30.844Chris Bovis · fastest of 13 · top 5 within 3.7s-0.757s (-0.50%)133.3Peter Shadowen+1.8 mph (+1.4%)+4.415squal +4.280s103.0%qual 102.9%
31 rule changes (AS: 11, STU: 4, GTL: 16)11 cars added · 6 engine · 4 weight · 3 induction · 1 aero · 1 tyres & wheels · 5 othershowhide
  • AS Mustang transmission ratios #36662engine
  • GTL Request to Include Toyota GR86 in GTL #36324cars added
  • GTL Inclusion of Modified Spec Miata for GTL competition #36325cars added
  • GTL Include Mazda MX5 RF 2017- in GTL #36428cars added
  • STU RWD Turbo Disadvantage #36255induction
  • GTL Add GTL to GT3 choke option line. #36236induction
  • 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
  • GTL Request for Spec Line 1010 Reconsideration #35009weight +300 lbs
  • GTL Allow 34 mm chokes for the Datsun 510 #35661induction +50 lbs
  • 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
  • STU Letter #35397 addendum #35453weight
  • STU S54 Drysump #35464other
  • GTL Rear Blade Spoiler Clarification #35261aero
  • GTL GT Direct Injection allowance and rules #35437engine
  • GTL GT2/3 remove Direction Injection not allowed in Spec line notes #35439engine
  • STU ST Electric-Assisted Steering Systems #35066other
  • GTL Rotary Engine 12A Rotor Housings #35131engine
  • GTL Request to Include Toyota GR86 in GTL #35198cars added
  • GTL Errors and Omissions, GTL engines & Cars #35226engine
  • GTL Small Engines in GT Lite #34842engine
  • GTL Request to Classify Honda Fit body in GTL #35020cars added
  • GTL Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight
  • GTL Weight for Nissan Sentra/200SX A 1400's #34918weight -50 lbs
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%)2:00.389Johan Schwartz · fastest of 13 · top 5 within 2.3s-0.226s (-0.19%)2:02.302Mark Liller · fastest of 14 · top 5 within 1.6s-30.055s (-19.73%)144.0Mark Liller+0.1 mph (+0.1%)-1.818squal -2.693s98.5%qual 97.8%2:09.564Peter Shadowen · fastest of 11 · top 5 within 4.9s+1.775s (+1.39%)2:11.277Graham Fuller · fastest of 10 · top 5 within 2.4s-9.903s (-7.01%)142.7Peter Shadowen+6.7 mph (+4.9%)+7.157squal +6.482s105.8%qual 105.3%
14 rule changes (AS: 4, STU: 3, GTL: 7)5 engine · 3 weight · 2 cars added · 2 induction · 1 suspension & brakes · 1 tyres & wheelsshowhide
  • 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
  • STU 2022 Toyota GR Cup for STU #34449cars added
  • GTL Please classify Fields Cardinal V8 #33784cars added
  • STU Alternate OEM Miata Intake Manifold #33827induction
  • STU E&O STU NA Weight Chart. #33737weight
  • GTL Toyota 4Y Engine Classification Request #33562engine
  • GTL Toyota 4A-F and 4A-FE 1.6L DOHC 16V Engine Request #33415engine
  • GTL Fiat HP Limited Prep X1/9 Weight in GTL #33297weight
  • GTL GT2 (TA2)/GTA Part Number Update #33315induction
  • GTL Request to add Ford Festiva to GTL #33335weight
  • GTL Engine Request #33064engine
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%)1:57.689James Weida · fastest of 11 · top 5 within 3.9s+0.328s (+0.28%)2:21.862Sven de Vries · fastest of 10 · top 5 within 14.3s+24.290s (+20.66%)142.9Calvin Stewart+0.1 mph (+0.1%)+17.284squal -4.473s113.9%qual 96.3%2:00.615Johan Schwartz · fastest of 21 · top 5 within 2.6s+0.667s (+0.56%)2:32.357Mark Liller · fastest of 19 · top 5 within 4.3s+31.874s (+26.46%)143.9Johan Schwartz+0.1 mph (+0.1%)+27.779squal -1.547s122.3%qual 98.7%2:07.789Peter Shadowen · fastest of 14 · top 5 within 2.2s+0.792s (+0.62%)2:21.180Michael Lewis · fastest of 13 · top 5 within 2.1s+13.343s (+10.44%)136.0Peter Shadowen+4.9 mph (+3.7%)+16.602squal +5.627s113.3%qual 104.6%
39 rule changes (AS: 9, F5: 6, STU: 21, GTL: 3)10 weight · 7 engine · 4 cars added · 4 induction · 2 suspension & brakes · 1 aero · 1 tyres & wheels · 2 wording · 8 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • F5 Intake Boots Correction #33028induction
  • GTL Tail lights on all GT category race cars. #32799suspension & brakes
  • F5 Ensure availability of ECU for Rotax engines #32695engine
  • STU Request Mazda 13 B turbo #32668induction
  • STU Hood Vents and Intercooler Scoops #32733other
  • STU Non 4 valve weight reduction removed #32808weight
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • F5 Clarify stepped exhaust header references #32743engine
  • STU Error in new minimum weight table when combined with other text #32711weight
  • STU Redundant Language in May GCR #32713engine
  • F5 593 carb boot availability and oil pump clarification #32527induction
  • STU Opposed to the Proposed STU Weight Chart #32381weight
  • STU Clarification request for GCR 9.1.4.D.3.a Splitter Definition #32414aero
  • STU Request Adjustment to Min Weight for STU BMW E36 M3 (95-99) #31535weight -90 lbs
  • STU BMW E36 M3 Canadian (North American) S50B32 engine #31866engine
  • STU Engine Swap Origin Country #32209engine
  • STU CRX/Civic Del Sol #32214cars added
  • STU Error correction #32383weight
  • STU Single TB Weight Modifiers Add to Chart #32393weight
  • F5 E&O class name #32194other
  • GTL Request to Classify Ginetta G40 in GTL #31599cars added
  • STU Single TB Weight Modifiers #31449weight
  • STU Request to Remove A4 1.8t from STU Spec Line Tables #31465weight
  • STU Improved Touring Tires #32063tyres & wheels
  • STU Request Allowance for Balance Shaft Delete in STU #31434engine
  • STU Request Louvers in hood vents #31916other
  • AS Proposed Revisions to SCCA GCR 2021 Appendix M, Part 3 #30295other
  • AS specification line consolidation and correction #31846wording
  • AS correction of SMG specification line #31847suspension & brakes
  • AS Alternate cylinder heads for full prep engine builds - Evaluation #31851engine
  • F5 Data Box Mounting Plate #31638other
  • STU Request to Add Honda K23 Spec Line #30682cars added
  • STU RE: Aug FT letter 30682 #31060other
  • STU Throttling Device Clarification #31323induction
  • AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other
  • AS Request Pontiac GTO tire size change #30881weight
  • GTL 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 Jost1:42.619Ryan Mayfield · fastest of 22 · top 5 within 1.6s-0.517s (-0.50%)1:43.140Sven de Vries · fastest of 20 · top 5 within 1.7s+0.280s (+0.27%)144.4James Weida-7.466squal -7.808s93.2%qual 92.9%1:47.078Joe Moser · fastest of 30 · top 5 within 2.0s-1.843s (-1.69%)1:47.441Joe Moser · fastest of 28 · top 5 within 1.8s-1.946s (-1.78%)146.9Kip VanSteenburg-3.165squal -3.349s97.1%qual 97.0%1:51.819Christopher Bovis · fastest of 22 · top 5 within 1.8s+1.488s (+1.35%)1:51.952Scott Twomey · fastest of 19 · top 5 within 1.7s-0.116s (-0.10%)129.5Brian Linn+1.346squal +1.392s101.2%qual 101.3%
37 rule changes (AS: 14, F5: 3, STU: 12, GTL: 8)12 weight · 6 engine · 5 cars added · 4 tyres & wheels · 1 aero · 1 induction · 1 suspension & brakes · 5 wording · 2 othershowhide
  • F5 Clarify allowable assisted shifting systems #30871wording
  • F5 Request to correct terminology #30976tyres & wheels
  • GTL Request to Update GTA Obsolete Part Numbers #30615wording
  • GTL Request clarification for the Honda B18a,bVS B18c #30482weight
  • GTL Request to Allow Hood Bulge on Nissan B13 Sentra #30504other
  • GTL Request BMW E21 Classing #30582tyres & wheels
  • STU STU Fender flares #30696tyres & wheels
  • STU Request weight reduction for 12A bridgeport motor in Miata #30751weight -200 lbs
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • AS Request to consolidate SN95 Mustang '94-'04 Mustang spec lines #30428cars added
  • AS American Sedan Transmission Rule Change Request #30595weight
  • AS Correction to specifications inadvertently deleted #30691wording
  • AS weight adjustments #30700weight +50 lbs
  • F5 Request to Allow Rotax 593 HO Engine #30712engine
  • STU Request for Fender Flare Clarification #30375weight
  • STU Provision for Interchangeable Engine Components Already Allowed #30342engine
  • STU ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
  • AS AS Mustang LP 4.6 3V Classification Transmission Request #29886weight
  • AS Request CF driveshaft on CTS-V for durability improvement #30117engine
  • AS Adjustment to model years of 5th generation RP Camaro #30348engine
  • GTL Request for Help for Mazda 12A #29754weight +50 lbs
  • STU Super Touring Alternate Miata Hubs #30345tyres & wheels
  • GTL Request LP HP Fiat X1/9 & Bertone 1500 to GTL #30058cars added
  • STU Brake Component Relocation #29990suspension & brakes
  • STU Porsche PDK #30081weight
  • STU Reference Letter #29333 Proposed STU 13B Spec Line Changes #30086weight
  • STU Drive Shaft Request #30087other
  • 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
  • GTL Please Add GTL Nissan 1.8L Engine MRA8DE #29805engine
  • GTL Increase 13b SIR size #29867induction
  • STU 13B Rules Adjustment #29333cars added
  • AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine
  • AS Rule simplification spec line communization #29824weight
  • STU Request clarification on wing measurement #29640aero
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 Eaton2:20.954Calvin Stewart · fastest of 16 · top 5 within 1.8s2:21.391James Weida · fastest of 14 · top 5 within 1.5s143.2Aaron Ellis-6.277squal -6.091s95.7%qual 95.9%2:27.883David Fiorelli · fastest of 14 · top 5 within 4.1s2:28.410Anthony Geraci · fastest of 14 · top 5 within 3.1s144.2David Fiorelli+0.742squal +0.838s100.5%qual 100.6%2:31.943Chris Bovis · fastest of 14 · top 5 within 6.3s2:31.601Peter Shadowen · fastest of 14 · top 5 within 7.2s131.4Peter Shadowen+3.933squal +4.898s102.7%qual 103.3%
56 rule changes (AS: 16, F5: 6, STU: 17, GTL: 17)13 induction · 10 aero · 9 weight · 8 engine · 5 cars added · 2 suspension & brakes · 2 tyres & wheels · 7 othershowhide
  • F5 Request to Update Suzuki Engine Years for F500 #29453engine
  • GTL GT Category Wording #29193induction
  • STU Request for Advanced Aero Rule Wording Clarification. #29124aero
  • AS Dodge Challenger AS Spec Line Clarification #28698induction
  • AS Dodge Challenger AS Spec Line Clarification #2 #28699aero
  • GTL Request to change the Mazda 13b restrictor size #28518induction +175 lbs
  • STU Minimum Weight Determination #27695weight
  • STU ST Gurney flap Wicker clarification #29012aero
  • AS Support for R-Type Specification Tires #27450tyres & wheels
  • AS Spec Tire Request #27519tyres & wheels
  • AS Restrictor Plate Change for RP 2011+ Mustang with Coyote Engine #27675induction
  • AS 2005-2009 Restricted Prep 4.6 3V #27908engine
  • AS Request for 2005-2009 Restricted Prep 4.6 3V Parts #27909engine
  • AS Request for Full Preparation Classification for 2010-2014 Camaro #28030other
  • AS Cylinder Heads #28696engine
  • AS Request for Max Rotor Diameter Change #28748suspension & brakes
  • AS Request increase rotor diameter #28797other
  • F5 Request for Cockpit Adjustment of External Jetting Devices #28359other
  • F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine
  • F5 Re letter requesting driver adjustable carb mixture #28840other
  • F5 #28359 WDYT Request for Cockpit Adjustment #28875other
  • GTL Request to classify 1999-2007 Toyota MR2 Spyder body #28870cars added
  • GTL TA2 Gurney flap wicker clarification #28874aero
  • GTL STO Gurney flap wicker clarification #28883aero
  • GTL GT Gurney flap wicker clarification #28909aero
  • GTL Mazda 13b Restrictor Size Follow up to Letter 28518 #29015induction
  • STU Request for Alternate Intake Manifold #26514induction
  • STU Request for Addition to GT3 Approved Turbo List #27576induction
  • STU Request BoP for my Car #29004induction
  • STU Sequential Shifters in STU #29031other
  • GTL Stall Test #28709induction
  • STU Rotary Help #27833weight
  • AS weight adjustments for 2020 season #28785weight -50 lbs
  • GTL GTL Wing Rule #28754aero
  • STU Request to approve Honda S2000 HKS supercharger #27281engine
  • STU Request BoP on the Lotus #27637weight +100 lbs
  • STU Turbo Inlet Restrictor On MK5 Volkswagen #27704induction
  • STU Honda K20C1 removal #27732induction
  • STU Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0 #27884engine
  • STU Alternate Engine for Porsche 944 #28259engine
  • GTL Wing Mounting Upright Size #27641aero
  • GTL Wing Mounting Upright Size #27641aero
  • GTL GTL wing end plates addition #28243aero
  • GTL Clarification to letter #27406 #28309weight -50 lbs
  • STU Please Modify the STU Wheel Size Rule for Clarity #27694weight
  • STU Turbo Engine Cars Base Weight #28032weight
  • 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
  • GTL Windshield Clips #27323other
  • F5 Change 600cc restrictor size #27883induction
  • GTL Request Factory Five Daytona coupe classification #26308cars added
  • GTL Request to Classify the MK1 two door Jetta #27648cars added
  • GTL 88-91 Honda CRX Spec Line Correction #27233weight
  • STU Request for an electronic throttle body #27342induction
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 Jost1:57.361Wiley Mcmahan · fastest of 15 · top 5 within 3.8s1:57.572Wiley Mcmahan · fastest of 15 · top 5 within 4.0s142.8Eric McRee-6.328squal -5.577s94.9%qual 95.5%1:59.948Kevin Boehm · fastest of 25 · top 5 within 3.5s2:00.483Kevin Boehm · fastest of 25 · top 5 within 2.5s143.8Kevin Boehm-3.417squal -2.990s97.2%qual 97.6%2:06.997Peter Shadowen · fastest of 19 · top 5 within 4.0s2:07.837Bill Ball · fastest of 18 · top 5 within 4.2s131.1Peter Shadowen+3.937squal +4.059s103.2%qual 103.3%
40 rule changes (AS: 4, F5: 1, STU: 22, GTL: 13)11 weight · 8 cars added · 7 induction · 4 suspension & brakes · 3 aero · 3 engine · 2 tyres & wheels · 1 wording · 1 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbs
  • GTL Fun Cup Beetle #27334weight
  • STU Request to correct E&O advanced aerodynamics #27290aero
  • AS Request Ride Height Clarification #26598suspension & brakes
  • GTL GTL #26960weight
  • GTL Request CRZ wheelbase change #26896tyres & wheels
  • STU Remove -2mm penalty from SR20DET Nissan #26982weight
  • STU Request clarification for manifold and throttle in STU #27004induction
  • AS Request to Revert to 2017 Weights #25885weight
  • STU Request to clarify afterrmarket side skirts exhaust exit #26814suspension & brakes
  • STU Wheel Flare wording #26872tyres & wheels
  • GTL Request to Classify VW Fun Cup Beetle #25986cars added
  • GTL Request GTX Fuel injection for previous GT-1 tube frame cars #26141engine
  • GTL Request to Classify Ligier JS2 R #26535cars added
  • GTL Request for GTL Mazda 13B SIR Increase with Penalty #26572engine
  • STU Request Ride Height Clarification #26597suspension & brakes
  • GTL Request Ride Height Clarification #26600suspension & brakes
  • STU Request to Use Japanese Mazda 13b Intake Manifold #25790induction
  • STU Request Alternate Intake for Mazda MZR In a Rear Wheel Drive App. #26352induction
  • STU E&O Suspension #26424wording
  • STU Revisit B20 VTEC #26530cars added
  • STU Move Flared Fenders to STU Advanced Aero #26564aero
  • STU TCA Civic SI E&O #26606induction
  • STU S54 Spec line #26620weight
  • GTL Request Mazda 12a Rotary SIR Increase #26081induction
  • GTL Request to Classify Mustang 2 Body in GTL #26222cars added
  • STU Request to Class Assignment for 2017 Civic #24287cars added
  • STU Request to run E46 3246cc in STU #25126weight
  • STU Engine Classification for Rotary #25564engine
  • STU K24/K20 Head Swap Clarification/Amendment #25899induction
  • STU Request to Classify 12a Bridge Ported Rotary Engine #25985cars added
  • STU World Challenge Car Eligibility #26387weight
  • STU Request a phone call for discussion regarding weight #26398weight
  • STU Advanced Aero E&O #26413aero
  • AS SMG Mustang eligibility in American sedan #26224cars added
  • GTL Request for GTL Mini Adjustments #25754weight
  • GTL BMC thru Rover Group remove long inactive mini #25771weight
  • GTL GTX Homologation table update #26034cars added
  • STU Request to Equalize Direct Injected Turbo Cars #24890induction
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 Fandozzi1:41.807Jeff Jorgenson · fastest of 5 · top 5 within 6.6s1:42.491David Lapham · fastest of 5 · top 5 within 9.5s113.3David Lapham-7.854squal -5.975s92.9%qual 94.5%1:19.234Franklin Church · fastest of 10 · top 5 within 21.5s1:46.514Kevin Boehm · fastest of 9 · top 5 within 7.4s103.0Franklin Church-3.831squal -28.548s96.5%qual 73.5%1:47.885Troy Ermish · fastest of 20 · top 5 within 4.5s1:49.458Troy Ermish · fastest of 19 · top 5 within 3.6s109.3Charles Leonard-0.887squal +0.103s99.2%qual 100.1%
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 0.9s1:43.136Wiley Clinton McMahan · fastest of 38 · top 5 within 1.4s1:42.860Wiley Clinton McMahan · fastest of 37 · top 5 within 1.6s-8.647squal -2.084s92.2%qual 98.0%1:48.921Rob Huffmaster · fastest of 34 · top 5 within 2.0s1:49.387Rob Huffmaster · fastest of 31 · top 5 within 2.4s-2.120squal +3.701s98.1%qual 103.5%1:50.331Christopher Bovis · fastest of 26 · top 5 within 1.5s1:52.068Christopher Bovis · fastest of 20 · top 5 within 1.0s+0.561squal +5.111s100.5%qual 104.9%
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 1.0s1:28.528Calvin Stewart · fastest of 14 · top 5 within 3.9s1:29.853Steven Thompson · fastest of 12 · top 5 within 4.5s-3.571squal -2.123s96.2%qual 97.7%1:32.738Joe Moser · fastest of 16 · top 5 within 2.5s1:34.597Cameron Maugeri · fastest of 16 · top 5 within 0.8s+1.173squal +2.087s101.3%qual 102.3%1:35.377Wilson Wright · fastest of 28 · top 5 within 1.2s1:35.912Kyle Disque · fastest of 28 · top 5 within 1.1s+2.488squal +4.726s102.7%qual 105.2%
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 2.2s2:01.824W. Clint McMahan · fastest of 16 · top 5 within 3.0s2:03.298Matthew Strand · fastest of 15 · top 5 within 4.9s+0.376squal +0.078s100.3%qual 100.1%2:05.494Eric Heinrich · fastest of 18 · top 5 within 4.6s2:06.756Eric Heinrich · fastest of 17 · top 5 within 3.5s+3.834squal +3.748s103.1%qual 103.1%2:11.387Jim Dentici · fastest of 10 · top 5 within 2.2s2:13.564Jim Dentici · fastest of 9 · top 5 within 2.0s+10.642squal +9.641s108.7%qual 107.9%

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.