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BoP Lab / Classes / STU

STU vs EP vs T2 vs AS pace at every track

Lap times across years say as much about the weather as the class. % of STU is each class's best lap as a share of STU'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-SpecvsEP×FAFCFE2FFFPFVFXGT1GT2GTXHPPP2SMSMXSRF3STLSTU×T1vsT2×T3T4Show 51 inactive classes
Series
Reference · what % is measured against, 12 events
Tracks · untick to narrow

Closest to the field: STU 100.0% of STU Eric Heinrich, Daytona International Speedway Runoffs 2015 race · EP 98.6% of STU Kip Van Steenburg, Daytona International Speedway Runoffs 2015 qualifying · T2 81.9% of STU Kurt Rezzetano, Virginia International Raceway Runoffs 2022 race · AS 81.8% of STU Gregory Eaton, Virginia International Raceway Runoffs 2022 race

1:402:002:2059 rule changes between Runoffs 2018 and Runoffs 201959 ▾77 rule changes between Runoffs 2019 and Runoffs 202077 ▾70 rule changes between Runoffs 2020 and Runoffs 202170 ▾71 rule changes between Runoffs 2021 and Runoffs 202271 ▾37 rule changes between Runoffs 2022 and Runoffs 202337 ▾60 rule changes between Runoffs 2023 and Runoffs 202460 ▾72 rule changes between Runoffs 2024 and Runoffs 202572 ▾75 rule changes between Runoffs 2025 and Runoffs 202675 ▾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)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)T2 race best at Runoffs 2015: 2:01.077 (Kurt Rezzetano)T2 race best at Runoffs 2016: 1:32.691 (John M Buttermore)T2 race best at Runoffs 2017: 1:48.769 (John M Buttermore)T2 race best at Runoffs 2018: 1:45.999 (John Kachadurian)T2 race best at Runoffs 2019: 1:58.551 (Cooper I MacNeil)T2 race best at Runoffs 2020: 2:26.803 (Kurt Rezzetano)T2 race best at Runoffs 2021: 1:48.474 (Kurt Rezzetano)T2 race best at Runoffs 2022: 2:04.756 (Kurt Rezzetano)T2 race best at Runoffs 2023: 2:01.201 (Kurt Rezzetano)T2 race best at Runoffs 2024: 2:23.261 (Kurt Rezzetano)T2 race best at Runoffs 2025: 2:23.483 (Kurt Rezzetano)T2 race best at Runoffs 2026: 2:23.141 (Scotty B White)T2 qualifying best at Runoffs 2015: 2:00.172 (Kurt Rezzetano)T2 qualifying best at Runoffs 2016: 1:31.563 (Preston Calvert)T2 qualifying best at Runoffs 2017: 1:48.618 (John M Buttermore)T2 qualifying best at Runoffs 2018: 1:45.032 (John Kachadurian)T2 qualifying best at Runoffs 2019: 1:57.537 (Cooper I MacNeil)T2 qualifying best at Runoffs 2020: 2:24.195 (Alan Kossof)T2 qualifying best at Runoffs 2021: 1:47.509 (Kurt Rezzetano)T2 qualifying best at Runoffs 2022: 2:00.276 (Kurt Rezzetano)T2 qualifying best at Runoffs 2023: 1:59.504 (Kurt Rezzetano)T2 qualifying best at Runoffs 2024: 2:22.117 (Kurt Rezzetano)T2 qualifying best at Runoffs 2025: 2:23.351 (Kurt Rezzetano)T2 qualifying best at Runoffs 2026: 2:23.977 (Scotty B White)AS race best at Runoffs 2015: 2:02.922 (Andy McDermid)AS race best at Runoffs 2016: 1:33.424 (Edward Hosni)AS race best at Runoffs 2017: 1:51.507 (Bryan Long)AS race best at Runoffs 2018: 1:50.345 (John Heinricy)AS race best at Runoffs 2019: 2:03.900 (James Jost)AS race best at Runoffs 2020: 2:27.668 (Gregory Eaton)AS race best at Runoffs 2021: 1:50.606 (Gregory Eaton)AS race best at Runoffs 2022: 2:04.578 (Gregory Eaton)AS race best at Runoffs 2023: 2:04.120 (Gregory Eaton)AS race best at Runoffs 2024: 2:26.429 (Gregory Eaton)AS race best at Runoffs 2025: 2:29.232 (Gregory Eaton)AS race best at Runoffs 2026: 2:28.471 (Andrew McDermid)AS qualifying best at Runoffs 2015: 2:01.746 (Tom Sloe)AS qualifying best at Runoffs 2016: 1:30.651 (Tom Sloe)AS qualifying best at Runoffs 2017: 1:45.220 (James Jost)AS qualifying best at Runoffs 2018: 1:47.782 (Andrew McDermid)AS qualifying best at Runoffs 2019: 2:02.938 (Gregory Eaton)AS qualifying best at Runoffs 2020: 2:27.045 (Gregory Eaton)AS qualifying best at Runoffs 2021: 1:50.427 (Drew Cattell)AS qualifying best at Runoffs 2022: 2:02.162 (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 2:03.082 (Daniel Richardson)AS qualifying best at Runoffs 2024: 2:26.578 (Gregory Eaton)AS qualifying best at Runoffs 2025: 2:26.792 (Andrew McDermid)AS qualifying best at Runoffs 2026: 2:26.911 (Andrew McDermid)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
STUEPT2ASsolid race · dashed qualifying · slower is lower
95%96%97%98%99%100%101%102%103%104%59 rule changes between Runoffs 2018 and Runoffs 201959 ▾77 rule changes between Runoffs 2019 and Runoffs 202077 ▾70 rule changes between Runoffs 2020 and Runoffs 202170 ▾71 rule changes between Runoffs 2021 and Runoffs 202271 ▾37 rule changes between Runoffs 2022 and Runoffs 202337 ▾60 rule changes between Runoffs 2023 and Runoffs 202460 ▾72 rule changes between Runoffs 2024 and Runoffs 202572 ▾75 rule changes between Runoffs 2025 and Runoffs 202675 ▾STU race best at Runoffs 2015: 100.0% of STU's (Eric Heinrich)STU race best at Runoffs 2016: 100.0% of STU's (Cameron Maugeri)STU race best at Runoffs 2017: 100.0% of STU's (Rob Huffmaster)STU race best at Runoffs 2018: 100.0% of STU's (Kevin Boehm)STU race best at Runoffs 2019: 100.0% of STU's (Kevin Boehm)STU race best at Runoffs 2020: 100.0% of STU's (Anthony Geraci)STU race best at Runoffs 2021: 100.0% of STU's (Joe Moser)STU race best at Runoffs 2022: 100.0% of STU's (Mark Liller)STU race best at Runoffs 2023: 100.0% of STU's (Mark Liller)STU race best at Runoffs 2024: 100.0% of STU's (Thomas Noble)STU race best at Runoffs 2025: 100.0% of STU's (Chip Herr)STU race best at Runoffs 2026: 100.0% of STU's (Richard Astacio)STU qualifying best at Runoffs 2015: 100.0% of STU's (Eric Heinrich)STU qualifying best at Runoffs 2016: 100.0% of STU's (Joe Moser)STU qualifying best at Runoffs 2017: 100.0% of STU's (Rob Huffmaster)STU qualifying best at Runoffs 2018: 100.0% of STU's (Franklin Church)STU qualifying best at Runoffs 2019: 100.0% of STU's (Kevin Boehm)STU qualifying best at Runoffs 2020: 100.0% of STU's (David Fiorelli)STU qualifying best at Runoffs 2021: 100.0% of STU's (Joe Moser)STU qualifying best at Runoffs 2022: 100.0% of STU's (Johan Schwartz)STU qualifying best at Runoffs 2023: 100.0% of STU's (Johan Schwartz)STU qualifying best at Runoffs 2024: 100.0% of STU's (Thomas Noble)STU qualifying best at Runoffs 2025: 100.0% of STU's (Peter Cunningham)STU qualifying best at Runoffs 2026: 100.0% of STU's (Richard Astacio)EP race best at Runoffs 2015: 98.7% of STU's (Kip Van Steenburg)EP race best at Runoffs 2016: 99.7% of STU's (Michael Galati)EP race best at Runoffs 2017: 100.9% of STU's (Matt Reynolds)EP race best at Runoffs 2018: 100.0% of STU's (Glen McCready)EP race best at Runoffs 2019: 101.0% of STU's (Jesse Prather)EP race best at Runoffs 2020: 100.4% of STU's (Jesse Prather)EP race best at Runoffs 2021: 102.3% of STU's (Jesse Prather)EP race best at Runoffs 2022: 99.0% of STU's (Jesse Prather)EP race best at Runoffs 2023: 101.4% of STU's (Greg Ira)EP race best at Runoffs 2024: 101.4% of STU's (Tyler Ladd)EP race best at Runoffs 2025: 102.9% of STU's (Tyler Ladd)EP race best at Runoffs 2026: 101.0% of STU's (Jon Brakke)EP qualifying best at Runoffs 2015: 98.6% of STU's (Kip Van Steenburg)EP qualifying best at Runoffs 2016: 101.2% of STU's (Michael Galati)EP qualifying best at Runoffs 2017: 100.6% of STU's (Matt Reynolds)Off the chart: EP qualifying best at Runoffs 2018: 133.6% of STU's (Glen McCready)EP qualifying best at Runoffs 2019: 100.9% of STU's (Jesse Prather)EP qualifying best at Runoffs 2020: 99.6% of STU's (Jesse Prather)EP qualifying best at Runoffs 2021: 101.0% of STU's (Jesse Prather)EP qualifying best at Runoffs 2022: 101.4% of STU's (Jesse Prather)EP qualifying best at Runoffs 2023: 102.3% of STU's (John Hainsworth)EP qualifying best at Runoffs 2024: 100.4% of STU's (Tyler Ladd)EP qualifying best at Runoffs 2025: 102.9% of STU's (Jon Brakke)EP qualifying best at Runoffs 2026: 103.0% of STU's (Jon Brakke)T2 race best at Runoffs 2015: 95.5% of STU's (Kurt Rezzetano)T2 race best at Runoffs 2016: 98.0% of STU's (John M Buttermore)T2 race best at Runoffs 2017: 99.4% of STU's (John M Buttermore)T2 race best at Runoffs 2018: 99.5% of STU's (John Kachadurian)T2 race best at Runoffs 2019: 98.4% of STU's (Cooper I MacNeil)T2 race best at Runoffs 2020: 98.9% of STU's (Kurt Rezzetano)T2 race best at Runoffs 2021: 101.0% of STU's (Kurt Rezzetano)Off the chart: T2 race best at Runoffs 2022: 81.9% of STU's (Kurt Rezzetano)T2 race best at Runoffs 2023: 99.1% of STU's (Kurt Rezzetano)T2 race best at Runoffs 2024: 98.2% of STU's (Kurt Rezzetano)T2 race best at Runoffs 2025: 99.3% of STU's (Kurt Rezzetano)T2 race best at Runoffs 2026: 97.8% of STU's (Scotty B White)T2 qualifying best at Runoffs 2015: 95.8% of STU's (Kurt Rezzetano)T2 qualifying best at Runoffs 2016: 98.7% of STU's (Preston Calvert)T2 qualifying best at Runoffs 2017: 99.7% of STU's (John M Buttermore)Off the chart: T2 qualifying best at Runoffs 2018: 132.6% of STU's (John Kachadurian)T2 qualifying best at Runoffs 2019: 98.0% of STU's (Cooper I MacNeil)T2 qualifying best at Runoffs 2020: 97.5% of STU's (Alan Kossof)T2 qualifying best at Runoffs 2021: 100.4% of STU's (Kurt Rezzetano)T2 qualifying best at Runoffs 2022: 99.7% of STU's (Kurt Rezzetano)T2 qualifying best at Runoffs 2023: 99.3% of STU's (Kurt Rezzetano)T2 qualifying best at Runoffs 2024: 97.2% of STU's (Kurt Rezzetano)T2 qualifying best at Runoffs 2025: 100.2% of STU's (Kurt Rezzetano)T2 qualifying best at Runoffs 2026: 99.4% of STU's (Scotty B White)AS race best at Runoffs 2015: 97.0% of STU's (Andy McDermid)AS race best at Runoffs 2016: 98.8% of STU's (Edward Hosni)AS race best at Runoffs 2017: 101.9% of STU's (Bryan Long)AS race best at Runoffs 2018: 103.6% of STU's (John Heinricy)AS race best at Runoffs 2019: 102.8% of STU's (James Jost)AS race best at Runoffs 2020: 99.5% of STU's (Gregory Eaton)AS race best at Runoffs 2021: 102.9% of STU's (Gregory Eaton)Off the chart: AS race best at Runoffs 2022: 81.8% of STU's (Gregory Eaton)AS race best at Runoffs 2023: 101.5% of STU's (Gregory Eaton)AS race best at Runoffs 2024: 100.4% of STU's (Gregory Eaton)AS race best at Runoffs 2025: 103.3% of STU's (Gregory Eaton)AS race best at Runoffs 2026: 101.4% of STU's (Andrew McDermid)AS qualifying best at Runoffs 2015: 97.0% of STU's (Tom Sloe)AS qualifying best at Runoffs 2016: 97.7% of STU's (Tom Sloe)AS qualifying best at Runoffs 2017: 96.6% of STU's (James Jost)Off the chart: AS qualifying best at Runoffs 2018: 136.0% of STU's (Andrew McDermid)AS qualifying best at Runoffs 2019: 102.5% of STU's (Gregory Eaton)AS qualifying best at Runoffs 2020: 99.4% of STU's (Gregory Eaton)AS qualifying best at Runoffs 2021: 103.1% of STU's (Drew Cattell)AS qualifying best at Runoffs 2022: 101.3% of STU's (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 102.2% of STU's (Daniel Richardson)AS qualifying best at Runoffs 2024: 100.2% of STU's (Gregory Eaton)AS qualifying best at Runoffs 2025: 102.6% of STU's (Andrew McDermid)AS qualifying best at Runoffs 2026: 101.4% of STU's (Andrew McDermid)Daytona International Speedway · Runoffs 2015R2015Mid-Ohio Sports Car Course · Runoffs 2016R2016Indianapolis Motor Speedway · Runoffs 2017R2017Sonoma Raceway · Runoffs 2018R2018Virginia International Raceway · Runoffs 2019R2019Road America · Runoffs 2020R2020Indianapolis Motor Speedway · Runoffs 2021R2021Virginia International Raceway · Runoffs 2022R2022Virginia International Raceway · Runoffs 2023R2023Road America · Runoffs 2024R2024Road America · Runoffs 2025R2025Road America · Runoffs 2026R2026
STUEPT2ASsolid race · dashed qualifying · each class's best lap as a share of STU's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventSTUEPT2AS
Qual best Race best Trap Qual best Race best Trap vs STU % of STU Qual best Race best Trap vs STU % of STU Qual best Race best Trap vs STU % of STU 
Road America Runoffs 20262026-09-282:24.912Richard 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%)2:29.239Jon 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%)+1.453squal +4.327s101.0%qual 103.0%2:23.977Scotty B White · fastest of 22 · top 5 within 2.5s+0.626s (+0.44%)2:23.141Scotty B White · fastest of 18 · top 5 within 2.7s-0.342s (-0.24%)147.2Ami Wilson-6.9 mph (-4.5%)-3.275squal -0.935s97.8%qual 99.4%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%)+2.055squal +1.999s101.4%qual 101.4%
75 rule changes (STU: 15, EP: 21, T2: 26, AS: 13)26 weight · 13 induction · 9 engine · 7 tyres & wheels · 4 cars added · 4 suspension & brakes · 2 aero · 1 removed · 3 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
  • STU Wheel and tire requirements for GT3U #40679tyres & wheels
  • T2 TCR Data Points - BoP #40508weight +300 lbs
  • 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
  • STU 9” Wheels #40433tyres & wheels
  • STU Weight adjustment to former GT3U cars #40474weight
  • T2 2023 TCR Hyundais #40278cars added
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • EP Honda S2000 Hardtop #40138other
  • STU Request to allow BMW M50B20TU engine in STU #40202engine
  • STU Calculating Weight #40224weight
  • T2 2015+ Ecoboost Mustang #40005weight -100 lbs
  • T2 C6 Corvette - All Body Trims Requested #40174aero
  • T2 T2-TCR Table Mazda 3 #40209tyres & wheels
  • EP Miata track width - errors and omissions #39976wording
  • EP Triumph GT6 Spec Change. #40098induction
  • 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
  • T2 14-17 BMW 435i Brake Approval Request #39910suspension & brakes
  • T2 Porsche Cayman S Spec Lines Needed for Atlanta HST #39947engine
  • T2 Please address loopholes in T2 TCR #40002weight
  • AS Re-Organization of AS Spec lines for 2026 #39887removed
  • STU Fab 9 Racing Intake Manifold in STU #39767induction
  • T2 BMW 240i Permitted Tune #39861other
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • T2 Request to Add 2014-2017 435i to T2 #38991cars added
  • T2 Consideration for Nissan Z & NISMO Z to Touring 2 Class #39296cars added
  • T2 Allow Alt Bushing Material in Toe Links #39607suspension & brakes
  • T2 Request for Classification of MG6 TCR in T2-TCR Class #39702cars added
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • EP Request to Update E30 BMW Throttle Body Diameter Verbiage #39363induction
  • STU Request for Permission on Aftermarket Turbo Kit and Intake #39529induction
  • T2 Alternate Placement of Fuse Panel and Electronics Request #39370other
  • T2 Rebalance Blackwing Cadillac T2 for 2026 #39426weight -50 lbs
  • T2 C6 LS2 Corvette Parity Request #39472induction
  • T2 T2 Tire Sizing #39490weight -25 lbs
  • T2 Rear Spoiler for Mustang GT S550 (15-23) #39499aero
  • T2 Clarify T4 Brake Rotor Allowance #39503suspension & brakes
  • AS 1994 Mustang Spec Line Request #39104engine
  • EP TR2 Notes E&O #39180weight
  • EP Balance of Power #39187weight +50 lbs
  • STU Turbo Inlet Restrictor Table #38961induction
  • STU 275 Tire Rule #38983tyres & wheels
  • STU STU Honda Engine weight penalty #39375weight
  • T2 Help the 2011-2014 s197Mustang GT and Boss302 Less Restriction #38523induction
  • T2 Improving Competitiveness of Gen 5 Camaro SS #39021weight -50 lbs
  • T2 Adjust T2 Darkhorse R #39346weight
  • 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
  • STU Non-Homologated Engine Swaps - Specifically K24A2 w/ Honda CRZ #38746weight
  • T2 ND Gearset Request for T4 #39166other
  • T2 ND Spec Lines Wrong PT#'s #39170weight
  • T2 Touring 2 Post-Runoffs BOP Adjustments and Changes #39274induction -50 lbs
  • T2 Adjust rev limit on Spec Corvette in T2 #39282other
  • 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 20252025-09-292:23.083Peter 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%)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%)+4.259squal +4.210s102.9%qual 102.9%2:23.351Kurt Rezzetano · fastest of 11 · top 5 within 3.1s+1.234s (+0.87%)2:23.483Kurt Rezzetano · fastest of 10 · top 5 within 2.9s+0.222s (+0.15%)154.1John Heinricy+4.8 mph (+3.2%)-1.014squal +0.268s99.3%qual 100.2%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%)+4.735squal +3.709s103.3%qual 102.6%
72 rule changes (STU: 18, EP: 14, T2: 29, AS: 11)21 weight · 12 induction · 10 engine · 8 tyres & wheels · 6 cars added · 3 suspension & brakes · 2 removed · 3 wording · 7 othershowhide
  • STU Lotus Weight Reduction E&O #38919weight
  • STU STU-TCR Adjustments #38723weight
  • STU Lotus Weight Reduction #38772weight -50 lbs
  • T2 Incorrect Touring Heading #38451wording
  • T2 Clarifications needed to BMW M2 CS cup line #38536tyres & wheels
  • T2 Fix brake allowance supersessions. #38554suspension & brakes
  • T2 C5 Corvette correction #38782induction
  • 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
  • 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
  • EP Base Weight Adjustment for H-Production X1/9 Spec Lines #38255weight -50 lbs
  • 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
  • T2 C6 T-2 Corvette 6 Liter Engine Restrictor #37490induction
  • T2 370Z Mid link Replacement for True Coil Overs and OEM Wheel Size #38014tyres & wheels
  • T2 T2 Cadillac tire #38210tyres & wheels
  • 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
  • T2 Please class the Darkhorse R in T2 #37295cars added
  • T2 T2 350Z Spec Line Cleanup #37603weight
  • 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
  • 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
  • T2 T2 BOP #37312induction
  • EP Effective date for Jan 2025 GCR updates #37654induction
  • T2 Mustang Update backdate #37275removed
  • T2 BOP Adjustment for 2016 - Camaro SS/1LE #37434weight +100 lbs
  • T2 BMW M235iR TCS CHANGE REQUEST #37470other
  • T2 Request to Classify Club Spec in Appropriate Touring Classes #37523cars 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
  • EP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line #37119weight -50 lbs
  • STU Audi 1.8t Wagon STU Table B #36685weight
  • STU Merger GT3 to STU #37486other
  • STU GT3 TCR Tire allowance #37494tyres & wheels
  • T2 Remove spec lines that have expired #37269induction
  • T2 BoP for the Various Mustangs #37185weight -50 lbs
  • T2 Spec Corvette Line Clarification. #37441weight
  • EP Triumph GT6 Adjustments #37112weight
  • STU Request to Remove Miata Hubs from General category #37138tyres & wheels
  • STU BMW N54/N55 Engine Allowance #37146engine
  • T2 Redundant Verbiage Regarding Mustang Spec Lines for Driveshaft #36484suspension & brakes
  • T2 Request Less Restriction for Ls-3 Engined C6 Corvette #36810induction
  • T2 Fuel Emissions Components #37076engine
  • T2 fix brake wording #37129suspension & brakes
  • T2 Evaporative emissions systems #37130engine
  • T2 Move Spec Boxster to T4 #37158cars added
  • T2 Corvette Wheels #37169tyres & wheels
  • T2 BMW 320i Spec Line #37204other
  • T2 Classification for a 2005 Cadillac CTS 3.6 liter 6 speed manual #37224cars added
  • T2 Please Consider Allowing Update to the C5 Corvette #37298induction
  • T2 Major error in lane, but nobody ran it. #37302removed
  • EP 1275 HP Spridget Level 2 Only #36518other
  • EP NA Miata Track Width Correction #36902wording
  • STU R53 15% Pulley Request #36980other
  • T2 Spec Corvette Change for T2 #37127tyres & wheels
Road America Runoffs 20242024-10-012:26.227Thomas 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%)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%)+2.045squal +0.576s101.4%qual 100.4%2:22.117Kurt Rezzetano · fastest of 8 · top 5 within 2.7s-2.078s (-1.44%)2:23.261Kurt Rezzetano · fastest of 7 · top 5 within 3.0s-3.542s (-2.41%)149.3Scotty B White+2.0 mph (+1.3%)-2.563squal -4.110s98.2%qual 97.2%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%)+0.605squal +0.351s100.4%qual 100.2%
60 rule changes (STU: 4, EP: 14, T2: 31, AS: 11)17 weight · 9 cars added · 7 suspension & brakes · 5 induction · 4 engine · 4 tyres & wheels · 2 wording · 12 othershowhide
  • AS Mustang transmission ratios #36662engine
  • EP Errant entry in HP production line item #36231other
  • STU RWD Turbo Disadvantage #36255induction
  • T2 Errors #36214induction -75 lbs
  • T2 Subaru Appeal #36258other
  • T2 S550 Brakes #36571suspension & brakes
  • T2 Mustang T2/T3 #35877other
  • T2 S550 Brakes #35926suspension & brakes
  • T2 T2-T4 Driveshaft Mistake...? #36050weight
  • T2 request for allowance of 6 piston calipers for T2 C5 corvettes #36126other
  • T2 B8/8.5 Audi S4 T3 and T2 #36195cars added
  • 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
  • T2 Allow T4 and T3 RX8 to Disable/Remove Factory Oil Inj. #35761engine
  • T2 Competition Adjustment Request/Wheel Size of E46 #35895tyres & wheels
  • T2 Driveshafts #35916weight
  • AS Restricted Prep Aftermarket Parts Request #35682other
  • AS Allowance of 11 #35824tyres & wheels
  • T2 Brake Request for 2009 Porsche Cayman #35723suspension & brakes
  • 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
  • STU Letter #35397 addendum #35453weight
  • STU S54 Drysump #35464other
  • T2 Reorganize Spec Lines #35375induction
  • T2 370Z Brake Rotor Size Correction #35487suspension & brakes
  • T2 Letter #35154 2018+ Mustang GT Expansion #35488suspension & brakes
  • EP Update 1988-1991 Civic to Match 1988-1991 CRX #35399weight
  • STU ST Electric-Assisted Steering Systems #35066other
  • T2 2015+ Mustang Sway Bar and A-Arm Request #35154suspension & brakes
  • T2 Brake Kits #35245suspension & brakes
  • T2 Runoffs wording on Caddy in T2 #35377wording
  • T2 More Car Lightening Stuff #35319weight
  • T2 Inclusion of B-C spec cars in T4 #35374other
  • T2 T2-T4 Set expiration dates on spec lines #35378induction
  • T2 Reply to letter #35161 and #31661 #35384weight +75 lbs
  • 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
  • T2 Rebalance Blackwing Cadillac T2 #35079tyres & wheels
  • T2 M2 CS RACING #35130weight -50 lbs
  • T2 Spec Corvette in T2 #35139weight -175 lbs
  • T2 T2 Viper BoP #35155tyres & wheels
  • T2 BOP Adjustment for 5.0L Mustangs #35156weight +75 lbs
  • T2 Take at Look at T-2 BOP #35161weight -50 lbs
  • T2 C5 Corvette Spec Line Oversight #35169weight
  • T2 Requested Update of Model Years of 370Z #35231other
  • EP Porsche 944/924S Rule Change Request #35002weight
  • EP Triumph GT6 Adjustments #35054weight -30 lbs
  • T2 M2 CS RACING #35122other
Virginia International Raceway Runoffs 20232023-09-232:00.389Johan 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%)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%)+1.748squal +2.826s101.4%qual 102.3%1:59.504Kurt Rezzetano · fastest of 13 · top 5 within 2.1s-0.772s (-0.64%)2:01.201Kurt Rezzetano · fastest of 13 · top 5 within 1.6s-3.555s (-2.85%)150.7Scotty B White-1.9 mph (-1.2%)-1.101squal -0.885s99.1%qual 99.3%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%)+1.818squal +2.693s101.5%qual 102.2%
37 rule changes (STU: 3, EP: 13, T2: 17, AS: 4)7 suspension & brakes · 7 weight · 6 engine · 5 induction · 3 tyres & wheels · 1 cars added · 2 wording · 6 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
  • T2 Corvette LS2 Restrictor Plate Adjustment #34456induction
  • T2 Blacking Cadillac Fuel Capacity #34624engine
  • T2 Rules Clarification for Mazda RX8 Spec Line #34395weight
  • T2 rule book corrections #34437wording
  • T2 Ride Height Correction for the T3 Solstice. #34615suspension & brakes
  • EP Correct Intake Valve Size on 1500cc Midget/Spitfire #34419induction
  • STU 2022 Toyota GR Cup for STU #34449cars added
  • T2 370Z Obsolete Parts & NISMO Alternatives to SPL Parts #34297weight
  • EP 914-6 Valve Size Correction #34185engine
  • T2 2009 Porsche Cayman Classing Request #34147other
  • T2 C5 Z06 Straight Line Speed #33575weight
  • EP Investigate Parity of Z3 #33343induction
  • STU Alternate OEM Miata Intake Manifold #33827induction
  • T2 Allowance of any nonmetallic bushing material in T2 #33833suspension & brakes
  • T2 Allow Adjustable stabilizer bar links #33861suspension & brakes
  • STU E&O STU NA Weight Chart. #33737weight
  • T2 Honda Civic Type R Tire Size Increase #33672tyres & wheels
  • T2 C5 Corvette Swaybars #33269other
  • T2 Mustang OEM Grill Request #33333other
  • 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
  • T2 BMW M235iR/M240iR Aftermarket 2WNR Shocks Allowed - Touring 2 #33464suspension & brakes -50 lbs
  • T2 Touring (T2-T5) Category #33617tyres & wheels
  • T2 ENO 9.1.9.2.D.1.e.1.a. #33651other
  • T2 Heavy Cars #33345weight +125 lbs
Virginia International Raceway Runoffs 20222022-09-242:00.615Johan 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%)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%)-1.502squal +1.711s99.0%qual 101.4%2:00.276Kurt Rezzetano · fastest of 14 · top 5 within 1.7s+2.739s (+2.33%)2:04.756Kurt Rezzetano · fastest of 14 · top 5 within 2.0s+6.205s (+5.23%)152.5Aaron Kaplan+3.2 mph (+2.1%)-27.601squal -0.339s81.9%qual 99.7%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%)-27.779squal +1.547s81.8%qual 101.3%
71 rule changes (STU: 21, EP: 21, T2: 20, AS: 9)16 weight · 10 cars added · 10 engine · 9 induction · 6 suspension & brakes · 4 tyres & wheels · 1 aero · 4 wording · 11 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
  • 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
  • STU Error in new minimum weight table when combined with other text #32711weight
  • STU Redundant Language in May GCR #32713engine
  • EP Subaru BRZ Model Years #32500other
  • T2 BMW M235iR/M240iR Min Weight Clarification #32430weight
  • T2 Follow up to Letter 30888 #32477other
  • EP EP MX-5 Global Cup Car #32218weight
  • EP Please Class BMW 128i in EP #32370cars added
  • EP Inconsistency in Body Work Descriptions #32396other
  • STU Opposed to the Proposed STU Weight Chart #32381weight
  • STU Clarification request for GCR 9.1.4.D.3.a Splitter Definition #32414aero
  • T2 Request Alternate Front & Rear Strut/Shock Top Hats #32452suspension & brakes
  • T2 Request BoP E92 torque #32456other
  • T2 Classify Cadillac Blackwing #32535cars added
  • EP Mazda RX8 with 13b Rotary #32170induction
  • EP Request Idle control valve clarification #32178engine
  • 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
  • T2 Request to Allow the Use of Aftermarket ECU's in Touring #31067engine
  • T2 BMW M2 CS Cup 2020- Exhaust #32243tyres & wheels
  • T2 RequestT2 classification- 2022 Cadillac CT4-V Blackwing #32263cars added
  • EP EP Adjustments #31858induction
  • EP 1999 3.8L Ford Mustang to EP? #31635weight
  • EP Improved Touring Tires #32064tyres & wheels
  • 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
  • T2 Reply to letter #31486/29879 T2-T4 Grill openings #31935suspension & brakes
  • T2 C6 Restrictor Help #31995induction
  • EP Throttle Body and Idle Air #31800induction
  • EP Porsche 968 Engine Questions #31831engine
  • EP Request weight reduction for 1979-1985 Mazda RX-7 #31833weight
  • STU Request Allowance for Balance Shaft Delete in STU #31434engine
  • STU Request Louvers in hood vents #31916other
  • T2 BMW Z4M Adjustment #31885weight -50 lbs
  • 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
  • STU Request to Add Honda K23 Spec Line #30682cars added
  • STU RE: Aug FT letter 30682 #31060other
  • STU Throttling Device Clarification #31323induction
  • T2 Touring 2 BOP adjustments for 2022 #31480weight -50 lbs
  • T2 Reply to letter 29879 T2-T4 Grill Openings #31486suspension & brakes
  • T2 Request to clarify radiator hoses #31682wording
  • T2 Clarify Permitted/Allowed #31743suspension & brakes
  • T2 SMG #31837other
  • EP 944S2 Restrictor #31396induction
  • EP Classing Clarification for 1986 Toyota Corolla FX16 #31527cars added
  • T2 Typo for BMW M2 CS Cup 2020 #31173suspension & brakes
  • T2 Request to Classify 2014 VW Jetta 1.8t TSI #30436cars added
  • T2 Request new car 2017 BMW M2 #30486cars added
  • T2 Request to Classify Porsche 997.2 GTS in T2 (body not = to C2S) #30686cars added
  • 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 20212021-09-251:47.078Joe 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 VanSteenburg1:48.181Jesse 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+2.487squal +1.103s102.3%qual 101.0%1:47.509Kurt Rezzetano · fastest of 26 · top 5 within 1.6s-1.109s (-1.02%)1:48.474Kurt Rezzetano · fastest of 26 · top 5 within 2.5s-0.295s (-0.27%)151.5Scotty B. White+1.033squal +0.431s101.0%qual 100.4%1:50.427Drew Cattell · fastest of 31 · top 5 within 1.9s+5.207s (+4.95%)1:50.606Gregory Eaton · fastest of 28 · top 5 within 1.7s-0.901s (-0.81%)153.8James Jost+3.165squal +3.349s102.9%qual 103.1%
70 rule changes (STU: 12, EP: 14, T2: 30, AS: 14)23 weight · 10 cars added · 6 engine · 6 suspension & brakes · 4 tyres & wheels · 2 induction · 1 aero · 5 wording · 13 othershowhide
  • T2 BMW M2 CS Power Stick Part Number #31087wording
  • 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
  • T2 997.1 EO #30933other
  • EP Lotus/Caterham 7 America Request #30392engine
  • EP Reclassify Daimler SP 250 #30721cars added
  • STU STU Fender flares #30696tyres & wheels
  • STU Request weight reduction for 12A bridgeport motor in Miata #30751weight -200 lbs
  • T2 Request #30406weight
  • 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
  • T2 Civic Type R Brake Rotors #29817suspension & brakes
  • T2 Mustang S550 Parity in T2 #29925other
  • T2 Request BOP on BMW Z4 T2 car #30597weight +50 lbs
  • T2 E92 #30639weight -50 lbs
  • 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
  • STU Request for Fender Flare Clarification #30375weight
  • T2 C5/6 Corvette in T1, T1-LP and T2 Dry Sump Standardization #29046other
  • T2 Request for Chevrolet Camaro 1LE (2016-) Auto Trans #29067other
  • T2 Request E46 M3 Minimum Competition Weight #29429weight -100 lbs
  • T2 Request to add 2015 to Chevrolet Camaro SS/1LE 2010-2014 #29736other
  • EP Please Classify Mazda3 in FP #30165cars added
  • STU Provision for Interchangeable Engine Components Already Allowed #30342engine
  • STU ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
  • T2 Request consistency review in GCR #30263other
  • T2 Class Spec Corvette in T2? #30297cars added
  • T2 E92 BMW Spring Rate Request #30391suspension & brakes
  • T2 Please correct recent T2 Spec Line #30401suspension & brakes
  • 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
  • STU Super Touring Alternate Miata Hubs #30345tyres & wheels
  • T2 Request BMW M2CS door glass removal #30254other
  • 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
  • T2 Request Addition of BMW M240iR #29503weight
  • T2 2021 Toyota Supra #29567cars added
  • T2 Request Cold Air Intake for Honda Civic Type R #29942induction
  • T2 Adjust T2 spec line that was missed in T2 BOP #30055weight -50 lbs
  • T2 Fix T2 Mustang spec line #30106other
  • T2 Z4 Wheel Size #30113tyres & wheels
  • T2 Clarify T2 Spec lines #30194tyres & wheels
  • 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
  • STU 13B Rules Adjustment #29333cars added
  • T2 Request to Classify BMW M2 CS #29523cars added
  • T2 350Z Rear Caliper Replacement #29710other
  • T2 Request Mustang 8.8” rear axle replacement #29860other
  • T2 Cap year range on all 86s #29908other
  • 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
  • STU Request clarification on wing measurement #29640aero
  • T2 Request to Reevaluate T2 Spec Line for E92 M3 #28266weight -50 lbs
  • T2 Request for Parity Among Vehicles Including S550 Mustang #29486weight -75 lbs
  • T2 Alfa Romeo 4C Launch Edition #29531other
Road America Runoffs 20202020-10-022:27.883David Fiorelli · fastest of 14 · top 5 within 4.1s2:28.410Anthony Geraci · fastest of 14 · top 5 within 3.1s144.2David Fiorelli2:27.322Jesse Prather · fastest of 20 · top 5 within 2.5s2:29.047Jesse Prather · fastest of 20 · top 5 within 2.8s141.7Jesse Prather+0.637squal -0.561s100.4%qual 99.6%2:24.195Alan Kossof · fastest of 15 · top 5 within 2.5s2:26.803Kurt Rezzetano · fastest of 14 · top 5 within 2.2s147.3Mark Boden-1.607squal -3.688s98.9%qual 97.5%2:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s149.2Gregory Eaton-0.742squal -0.838s99.5%qual 99.4%
77 rule changes (STU: 17, EP: 14, T2: 30, AS: 16)15 induction · 15 weight · 11 engine · 10 suspension & brakes · 6 cars added · 4 aero · 4 tyres & wheels · 6 wording · 6 othershowhide
  • EP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O #29458tyres & wheels
  • T2 Request 2018+ mustang swaybar update #28659suspension & brakes
  • STU Request for Advanced Aero Rule Wording Clarification. #29124aero
  • T2 Request to Clarify New 2-piece Brake Rotor Rule #29106suspension & brakes
  • T2 please consider BoP for the following cars in T2 #29266weight -50 lbs
  • T2 Request clarification on most recent approval by the Board #29284suspension & brakes
  • AS Dodge Challenger AS Spec Line Clarification #28698induction
  • AS Dodge Challenger AS Spec Line Clarification #2 #28699aero
  • EP EP BMW Z3 Rule Clarification #28998engine
  • STU Minimum Weight Determination #27695weight
  • STU ST Gurney flap Wicker clarification #29012aero
  • T2 Request to correct GCR for 2018+ FORD Mustang GT & Ecoboost #28803wording
  • 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
  • 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
  • T2 Request to Add a Vehicle to the Roster (contd.) #27698other
  • T2 Request brake upgrade and electric power steering pump #28946suspension & brakes
  • EP BMW Cylinder Head Casting and Part Numbers #28708engine
  • STU Rotary Help #27833weight
  • T2 Request to Classify 2004 Mercedes Benz 320 CLK #27663cars added
  • T2 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
  • T2 Please Add the Following BBK to Allowed List for E92 M3 #28421wording
  • T2 C5 Weight Adjustment #28433weight -50 lbs
  • T2 Z3M Roadster Weight #28437weight
  • EP Caterham 7 Spec Line #28498engine
  • 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
  • T2 Limit Changes to the 997.2 Porsche #28242aero
  • T2 Correct T2 Mustang Transmission #28732wording
  • 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
  • STU Please Modify the STU Wheel Size Rule for Clarity #27694weight
  • STU Turbo Engine Cars Base Weight #28032weight
  • T2 Request to Readjust the T2 Porsches #27746induction
  • 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
  • T2 Please Switch the Solstice GXP as Specified in T2, to T3 #27413weight -50 lbs
  • T2 Request for Two Piece Stop Tech Brake Rotors #27582suspension & brakes
  • T2 Request to Classify all Mazda RX8 Models in T3/T4 #27606cars added
  • T2 Request for Alternative Brake Kit on Nissan 370Z #27912suspension & brakes
  • T2 2015- Current Ecoboost Mustang #27971weight -100 lbs
  • T2 T2 Mustang #28022tyres & wheels
  • EP Request to List Mazda Miata Throttle Body Size #27907induction
  • T2 Clarification of On-Board Fire System for T2 #27183wording
  • T2 Mustang Ecoboost and GT Transmission #27439other
  • T2 Request for Dailey Engineering Dry Sump on 2010 Camaro SS #27514engine
  • T2 Request for Half Shafts - 2014 Camaro SS 1LE #27584induction
  • T2 Request for Parity Among Vehicles #27665weight -50 lbs
  • T2 Request for 2016-2020 Camaro SS Help #27776weight -50 lbs
  • T2 Request for Competitive Adjustments to Honda Civic Type R #27839weight -50 lbs
  • T2 T4 RX8 Classification Error #27902wording
  • T2 Request to add Toyota 86 GT to Spec Line #27910other
  • EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661engine
  • STU Request for an electronic throttle body #27342induction
Virginia International Raceway Runoffs 20192019-10-051:59.948Kevin Boehm · fastest of 25 · top 5 within 3.5s2:00.483Kevin Boehm · fastest of 25 · top 5 within 2.5s143.8Kevin Boehm2:00.987Jesse Prather · fastest of 29 · top 5 within 2.2s2:01.631Jesse Prather · fastest of 24 · top 5 within 1.4s147.5Kip Van Steenburg+1.148squal +1.039s101.0%qual 100.9%1:57.537Cooper I MacNeil · fastest of 19 · top 5 within 3.4s1:58.551Cooper I MacNeil · fastest of 18 · top 5 within 2.4s149.4James Leithauser-1.932squal -2.411s98.4%qual 98.0%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+3.417squal +2.990s102.8%qual 102.5%
59 rule changes (STU: 22, EP: 10, T2: 23, AS: 4)12 weight · 11 suspension & brakes · 10 cars added · 9 induction · 4 tyres & wheels · 3 aero · 2 engine · 3 wording · 5 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
  • STU Request to correct E&O advanced aerodynamics #27290aero
  • T2 Request spare tire/wheel clarification #27012tyres & wheels
  • AS Request Ride Height Clarification #26598suspension & brakes
  • EP Request Miata Eligibility - 2003 #27121other
  • STU Remove -2mm penalty from SR20DET Nissan #26982weight
  • STU Request clarification for manifold and throttle in STU #27004induction
  • T2 Request to change Cadillac CTS-V years from 06-07 to 04-07 #26842cars added
  • T2 Request to allow Hotchkiss front / rear sway bars on T2 CTS-V #26845suspension & brakes
  • T2 Consider T2 06-07 Cadillac CTS-V BoP #27022induction
  • T2 Correct T2 Mustang tire size #27024tyres & wheels
  • 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
  • T2 2018+ Audi TT RS Suspension Allowances #26631suspension & brakes
  • T2 Request BOP adjustment for 2018 Honda Civic Type R-TIR removal #26882weight +150 lbs
  • EP Allow Firewall Modification for Fitment of 13B into RX8 #26726engine
  • STU Request Ride Height Clarification #26597suspension & brakes
  • EP Rollcenter Correction Clarification #25873tyres & wheels
  • EP Hardtops #26476wording
  • 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
  • T2 Request for Removal of Rear Anti-roll Bar in T2 Mustang GT #26533suspension & brakes
  • EP Request for Competition Adjustment for 2nd Generation RX7 #25935weight -50 lbs
  • 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
  • T2 Request Mustang GT Limited Prep 2018 Classification #24431cars added
  • T2 Request to Classify 2018 Audi TT RS #25961cars added
  • T2 Request for Adjustments on 2017+ Civic Type R #25969suspension & brakes
  • T2 Correct Mazda MX-5 Hard Top Notes #26137weight
  • T2 Consider opening class rules to allow any thermostat #26187wording
  • T2 Ford Mustang Boss 302 (12-13) - correct weight #26287weight -50 lbs
  • T2 Request camber correction 005-2013 corvette C6 #26288suspension & brakes
  • T2 Request 98-02 Firebird 98-02 Camaro reloacte rear spring #26291suspension & brakes
  • T2 Cap 2016 Mazda Miata year at 2018 #26388other
  • T2 Class Ford Mustang GT 2018+ (reference letter 24431) #26400cars added
  • AS SMG Mustang eligibility in American sedan #26224cars added
  • STU Request to Equalize Direct Injected Turbo Cars #24890induction
  • T2 Errors, Omissions, and Updates (Various) #22414weight
  • T2 Request to classify 2015 Cayman GTS 3.4L in T2 #25335cars added
  • T2 Request for 2017-2018 Honda Civic Type R - 4 BOP Grill #25513other
  • T2 Add Clarification to Spec Car Classifications Vehicle Spec #25774weight
  • T2 Clarify Subframe Bushings Permitted for T2-T4 #25800suspension & brakes
Sonoma Raceway Runoffs 20182018-10-101:19.234Franklin Church · fastest of 10 · top 5 within 21.5s1:46.514Kevin Boehm · fastest of 9 · top 5 within 7.4s103.0Franklin Church1:45.828Glen McCready · fastest of 18 · top 5 within 4.3s1:46.518Glen McCready · fastest of 16 · top 5 within 2.8s106.5Aaron Downey+0.004squal +26.594s100.0%qual 133.6%1:45.032John Kachadurian · fastest of 30 · top 5 within 2.4s1:45.999John Kachadurian · fastest of 28 · top 5 within 3.0s106.5John Kachadurian-0.515squal +25.798s99.5%qual 132.6%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+3.831squal +28.548s103.6%qual 136.0%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:48.921Rob Huffmaster · fastest of 34 · top 5 within 2.0s1:49.387Rob Huffmaster · fastest of 31 · top 5 within 2.4s1:49.597Matt Reynolds · fastest of 44 · top 5 within 1.2s1:50.396Matt Reynolds · fastest of 45 · top 5 within 0.5s+1.009squal +0.676s100.9%qual 100.6%1:48.618John M Buttermore · fastest of 26 · top 5 within 0.8s1:48.769John M Buttermore · fastest of 25 · top 5 within 1.2s-0.618squal -0.303s99.4%qual 99.7%1:45.220James Jost · fastest of 29 · top 5 within 6.7s1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s+2.120squal -3.701s101.9%qual 96.6%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:32.738Joe Moser · fastest of 16 · top 5 within 2.5s1:34.597Cameron Maugeri · fastest of 16 · top 5 within 0.8s1:33.847Michael Galati · fastest of 25 · top 5 within 0.8s1:34.266Michael Galati · fastest of 23 · top 5 within 1.3s-0.331squal +1.109s99.7%qual 101.2%1:31.563Preston Calvert · fastest of 22 · top 5 within 0.5s1:32.691John M Buttermore · fastest of 20 · top 5 within 1.5s-1.906squal -1.175s98.0%qual 98.7%1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s-1.173squal -2.087s98.8%qual 97.7%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-212:05.494Eric Heinrich · fastest of 18 · top 5 within 4.6s2:06.756Eric Heinrich · fastest of 17 · top 5 within 3.5s2:03.794Kip Van Steenburg · fastest of 29 · top 5 within 3.2s2:05.109Kip Van Steenburg · fastest of 28 · top 5 within 3.3s-1.647squal -1.700s98.7%qual 98.6%2:00.172Kurt Rezzetano · fastest of 20 · top 5 within 3.2s2:01.077Kurt Rezzetano · fastest of 19 · top 5 within 2.8s-5.679squal -5.322s95.5%qual 95.8%2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s-3.834squal -3.748s97.0%qual 97.0%

By track

TrackEvents Typical % of STU 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 STU'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.