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BoP Lab / Classes / P1

P1 vs AS vs SMX pace at every track

Lap times across years say as much about the weather as the class. % of P1 is each class's best lap as a share of P1'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)
vsAS×B-Spec+EP+FA+FC+FE2+FF+FP+FV+FX+GT1+GT2+GTX+HP+P+P1×P2+SM+vsSMX×SRF3+STL+STU+T1+T2+T3+T4+Show 50 inactive classes
Series
Reference · what % is measured against
Tracks · untick to narrow

Closest to the field: P1 100.0% of P1 Gianpaolo Ciancimino, Daytona International Speedway Runoffs 2015 race · AS 109.2% of P1 Gregory Eaton, Virginia International Raceway Runoffs 2022 race · SMX 127.1% of P1 Noah Harmon, Virginia International Raceway Runoffs 2023 race

1:201:402:002:202:4018 rule changes between Runoffs 2018 and Runoffs 201918 ▾20 rule changes between Runoffs 2019 and Runoffs 202020 ▾25 rule changes between Runoffs 2020 and Runoffs 202125 ▾12 rule changes between Runoffs 2021 and Runoffs 202212 ▾11 rule changes between Runoffs 2022 and Runoffs 202311 ▾21 rule changes between Runoffs 2023 and Runoffs 202421 ▾16 rule changes between Runoffs 2024 and Runoffs 202516 ▾15 rule changes between Runoffs 2025 and Runoffs 202615 ▾P1 race best at Runoffs 2015: 1:49.792 (Gianpaolo Ciancimino)Off the chart: P1 race best at Runoffs 2016: 1:19.407 (Gianpaolo Ciancimino)P1 race best at Runoffs 2017: 1:31.499 (Jim Devenport)P1 race best at Runoffs 2018: 1:28.786 (Perry Richardson)P1 race best at Runoffs 2019: 1:43.498 (Todd Slusher)P1 race best at Runoffs 2020: 2:01.870 (James French)P1 race best at Runoffs 2021: 1:29.225 (Lee Alexander)P1 race best at Runoffs 2022: 1:54.095 (John Mcaleer)P1 race best at Runoffs 2023: 1:44.329 (Todd Vanacore)P1 race best at Runoffs 2024: 2:00.418 (Matt Romer)P1 qualifying best at Runoffs 2015: 1:49.219 (Jim Downing)Off the chart: P1 qualifying best at Runoffs 2016: 1:17.308 (James Devenport)P1 qualifying best at Runoffs 2017: 1:30.794 (Jim Devenport)P1 qualifying best at Runoffs 2018: 1:27.714 (Todd Slusher)P1 qualifying best at Runoffs 2019: 1:42.674 (Todd Slusher)P1 qualifying best at Runoffs 2020: 2:01.101 (James French)P1 qualifying best at Runoffs 2021: 1:29.011 (Lee Alexander)P1 qualifying best at Runoffs 2022: 1:41.601 (Todd Slusher)P1 qualifying best at Runoffs 2023: 1:42.602 (Todd Vanacore)P1 qualifying best at Runoffs 2024: 2:00.476 (Chip Romer)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)SMX race best at Runoffs 2023: 2:12.616 (Noah Harmon)SMX race best at Runoffs 2024: 2:36.278 (Ethan Jacobs)SMX race best at Runoffs 2025: 2:37.091 (Michael Tinis)SMX race best at Runoffs 2026: 2:36.414 (Cam Ebben)SMX qualifying best at Runoffs 2023: 2:11.435 (Nathan Nicholson)SMX qualifying best at Runoffs 2024: 2:35.651 (Ethan Lampe)SMX qualifying best at Runoffs 2025: 2:36.232 (Cam Ebben)SMX qualifying best at Runoffs 2026: 2:36.472 (Skyler Cottrell)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
P1ASSMXsolid race · dashed qualifying · slower is lower
100%110%120%130%18 rule changes between Runoffs 2018 and Runoffs 201918 ▾20 rule changes between Runoffs 2019 and Runoffs 202020 ▾25 rule changes between Runoffs 2020 and Runoffs 202125 ▾12 rule changes between Runoffs 2021 and Runoffs 202212 ▾11 rule changes between Runoffs 2022 and Runoffs 202311 ▾21 rule changes between Runoffs 2023 and Runoffs 202421 ▾16 rule changes between Runoffs 2024 and Runoffs 202516 ▾15 rule changes between Runoffs 2025 and Runoffs 202615 ▾P1 race best at Runoffs 2015: 100.0% of P1's (Gianpaolo Ciancimino)P1 race best at Runoffs 2016: 100.0% of P1's (Gianpaolo Ciancimino)P1 race best at Runoffs 2017: 100.0% of P1's (Jim Devenport)P1 race best at Runoffs 2018: 100.0% of P1's (Perry Richardson)P1 race best at Runoffs 2019: 100.0% of P1's (Todd Slusher)P1 race best at Runoffs 2020: 100.0% of P1's (James French)P1 race best at Runoffs 2021: 100.0% of P1's (Lee Alexander)P1 race best at Runoffs 2022: 100.0% of P1's (John Mcaleer)P1 race best at Runoffs 2023: 100.0% of P1's (Todd Vanacore)P1 race best at Runoffs 2024: 100.0% of P1's (Matt Romer)P1 qualifying best at Runoffs 2015: 100.0% of P1's (Jim Downing)P1 qualifying best at Runoffs 2016: 100.0% of P1's (James Devenport)P1 qualifying best at Runoffs 2017: 100.0% of P1's (Jim Devenport)P1 qualifying best at Runoffs 2018: 100.0% of P1's (Todd Slusher)P1 qualifying best at Runoffs 2019: 100.0% of P1's (Todd Slusher)P1 qualifying best at Runoffs 2020: 100.0% of P1's (James French)P1 qualifying best at Runoffs 2021: 100.0% of P1's (Lee Alexander)P1 qualifying best at Runoffs 2022: 100.0% of P1's (Todd Slusher)P1 qualifying best at Runoffs 2023: 100.0% of P1's (Todd Vanacore)P1 qualifying best at Runoffs 2024: 100.0% of P1's (Chip Romer)AS race best at Runoffs 2015: 112.0% of P1's (Andy McDermid)AS race best at Runoffs 2016: 117.7% of P1's (Edward Hosni)AS race best at Runoffs 2017: 121.9% of P1's (Bryan Long)AS race best at Runoffs 2018: 124.3% of P1's (John Heinricy)AS race best at Runoffs 2019: 119.7% of P1's (James Jost)AS race best at Runoffs 2020: 121.2% of P1's (Gregory Eaton)AS race best at Runoffs 2021: 124.0% of P1's (Gregory Eaton)AS race best at Runoffs 2022: 109.2% of P1's (Gregory Eaton)AS race best at Runoffs 2023: 119.0% of P1's (Gregory Eaton)AS race best at Runoffs 2024: 121.6% of P1's (Gregory Eaton)AS qualifying best at Runoffs 2015: 111.5% of P1's (Tom Sloe)AS qualifying best at Runoffs 2016: 117.3% of P1's (Tom Sloe)AS qualifying best at Runoffs 2017: 115.9% of P1's (James Jost)AS qualifying best at Runoffs 2018: 122.9% of P1's (Andrew McDermid)AS qualifying best at Runoffs 2019: 119.7% of P1's (Gregory Eaton)AS qualifying best at Runoffs 2020: 121.4% of P1's (Gregory Eaton)AS qualifying best at Runoffs 2021: 124.1% of P1's (Drew Cattell)AS qualifying best at Runoffs 2022: 120.2% of P1's (Kurt Rezzetano)AS qualifying best at Runoffs 2023: 120.0% of P1's (Daniel Richardson)AS qualifying best at Runoffs 2024: 121.7% of P1's (Gregory Eaton)SMX race best at Runoffs 2023: 127.1% of P1's (Noah Harmon)SMX race best at Runoffs 2024: 129.8% of P1's (Ethan Jacobs)SMX qualifying best at Runoffs 2023: 128.1% of P1's (Nathan Nicholson)SMX qualifying best at Runoffs 2024: 129.2% of P1's (Ethan Lampe)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
P1ASSMXsolid race · dashed qualifying · each class's best lap as a share of P1's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker
EventP1ASSMX
Qual best Race best Trap Qual best Race best Trap vs P1 % of P1 Qual best Race best Trap vs P1 % of P1 
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%)2:36.472Skyler Cottrell · fastest of 21 · top 5 within 0.4s+0.240s (+0.15%)2:36.414Cam Ebben · fastest of 21 · top 5 within 1.1s-0.677s (-0.43%)128.4Christian Hoagland-0.6 mph (-0.5%)
15 rule changes (AS: 13, SMX: 2)5 weight · 3 engine · 2 tyres & wheels · 1 induction · 1 removed · 1 wording · 2 othershowhide
  • AS 2016+ Camaro Spec Line Full Prep #39646tyres & wheels
  • AS Consideration of Pirelli P Zero Trofeo Track for AS Competition #40495tyres & wheels
  • AS Change in 9.1.6.D.4.d.5 in Suspension Mounting Points #40094other
  • AS Re-Add 4.6L 4v 96-04 Mustang Cobra #40239weight
  • AS Errors and Omissions #40532weight
  • SMX Rear Toe Link #40271other
  • AS Clarification for LM7 Holley Carburetor #40167engine
  • AS Header Information Update for EFI Engine Build Sheets #39886engine
  • AS Errors and Omissions #39933weight
  • SMX Part Number Change Request #39914wording
  • AS Re-Organization of AS Spec lines for 2026 #39887removed
  • AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight
  • AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction
  • AS 1994 Mustang Spec Line Request #39104engine
  • AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs
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%)2:36.232Cam Ebben · fastest of 20 · top 5 within 0.2s+0.581s (+0.37%)2:37.091Michael Tinis · fastest of 19 · top 5 within 0.3s+0.813s (+0.52%)129.1Camden Gruber-0.4 mph (-0.3%)
16 rule changes (AS: 11, SMX: 5)5 engine · 3 weight · 2 induction · 1 tyres & wheels · 1 wording · 4 othershowhide
  • AS RE: Previous Letter 37695 Update #38245weight -75 lbs
  • AS Errors and Omissions #38234engine
  • SMX SMX Data Submission - Penalties #38248other
  • SMX SMX Penaly Clarification updated language #38337wording
  • AS Errors and Omission #38055induction
  • AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO #38197engine
  • SMX Clarify Tire Marking Regs #38004tyres & wheels
  • SMX SMX Data Submission Timeframe #38039other
  • AS Flotek Head Plunge Cut Inconsistencies #37502other
  • AS Notes clean up #37693weight
  • AS Race memo #37902engine
  • AS Increase Coyote Engine Restrictor to 80mm #36177induction
  • AS Performance Pack for 2015+ Mustang #36867weight
  • AS Gear Ratios #37131engine
  • AS ECU specs for LS engine #37208engine
  • SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other
Road America Runoffs 20242024-10-012:00.476Chip Romer · fastest of 12 · top 5 within 1.5s-0.625s (-0.52%)2:00.418Matt Romer · fastest of 9 · top 5 within 2.1s-1.452s (-1.19%)168.3Jason Miller+8.7 mph (+5.4%)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%)+26.011squal +26.102s121.6%qual 121.7%2:35.651Ethan Lampe · fastest of 23 · top 5 within 0.7s2:36.278Ethan Jacobs · fastest of 22 · top 5 within 0.7s129.5Michael Borden+35.860squal +35.175s129.8%qual 129.2%
21 rule changes (P1: 6, AS: 11, SMX: 4)6 cars added · 4 engine · 2 induction · 2 weight · 1 suspension & brakes · 1 tyres & wheels · 1 wording · 4 othershowhide
  • AS Mustang transmission ratios #36662engine
  • SMX SMX Camera Rule Correction #36496wording
  • SMX AIM ECU Protocol #36556engine
  • SMX OE versus OEM Definitons #36608other
  • SMX Shifter Bushing #36611suspension & brakes
  • AS Request for Classification of 2018-2023 mustang In #35764cars added
  • AS 6th gen Camaro limited prep #35733cars added
  • AS Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V8 LS1 Alum BLK #35825cars added
  • AS Full Prep Head #35891other
  • P1 Update GCR section 9.1.8.B.J.7 #35907engine
  • 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
  • P1 Remove redundant effective date language in GCR 9.1.8.B.J.4 #35693induction
  • P1 Correct engine series terminology #35694engine
  • P1 Please correct omitted punctuation #34890weight
  • P1 Adjust restrictors and weights for Engine Table lines H and I #35229induction
  • P1 Revise Group CN Honda K20A-FD2 Spec Line #35337weight
Virginia International Raceway Runoffs 20232023-09-231:42.602Todd Vanacore · fastest of 10 · top 5 within 0.9s+1.001s (+0.99%)1:44.329Todd Vanacore · fastest of 9 · top 5 within 0.7s-9.766s (-8.56%)158.5Jason Miller+1.2 mph (+0.8%)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%)+19.791squal +20.480s119.0%qual 120.0%2:11.435Nathan Nicholson · fastest of 18 · top 5 within 0.6s2:12.616Noah Harmon · fastest of 16 · top 5 within 0.1s127.8Noah Harmon+28.287squal +28.833s127.1%qual 128.1%
11 rule changes (P1: 7, AS: 4)3 induction · 3 tyres & wheels · 2 aero · 2 engine · 1 suspension & brakesshowhide
  • AS Crate Motor Part Numbers #32944engine
  • AS Request wheel size change #33007tyres & wheels
  • AS Alternative Upper Front Control Arms for Dodge Challenger #33352engine
  • AS Front Brake Caliper Adapters for Dodge Challenger #33353suspension & brakes
  • P1 SIR Testing #34354induction
  • P1 E&O Single Inlet Restrictor abbreviation, etc. #34369induction
  • P1 E&O Clean up ducted air provision #34410tyres & wheels
  • P1 E&O - Correct dimensional equivalents #34018tyres & wheels
  • P1 November 2022 Rules Clarification for Suspension Covers #33615aero
  • P1 Clarify body panel coverage of suspension components #33318aero
  • P1 E&O clarification regarding forced induction #33123induction
Virginia International Raceway Runoffs 20222022-09-241:41.601Todd Slusher · fastest of 9 · top 5 within 2.3s-1.073s (-1.05%)1:54.095John Mcaleer · fastest of 9 · top 5 within 1.4s+10.597s (+10.24%)157.2Jason Miller+1.3 mph (+0.8%)2:02.162Kurt Rezzetano · fastest of 13 · top 5 within 2.3s-0.776s (-0.63%)2:04.578Gregory Eaton · fastest of 11 · top 5 within 2.9s+0.678s (+0.55%)150.9James Jost-3.0 mph (-2.0%)+10.483squal +20.561s109.2%qual 120.2%
12 rule changes (P1: 3, AS: 9)3 weight · 1 engine · 1 induction · 1 suspension & brakes · 1 tyres & wheels · 2 wording · 3 othershowhide
  • AS Request to add Hoosier W2 #33031other
  • AS correction of Dodge Challenger specification line #33151wording
  • P1 Clarify authorization to use flat plate intake restrictor #32964induction
  • AS Request CTS-V Spec Line Error Correction #30242weight
  • P1 E&O Clarification of Bodywork Rules #32468tyres & wheels
  • AS Proposed Revisions to SCCA GCR 2021 Appendix M, Part 3 #30295other
  • AS specification line consolidation and correction #31846wording
  • AS correction of SMG specification line #31847suspension & brakes
  • AS Alternate cylinder heads for full prep engine builds - Evaluation #31851engine
  • P1 Displacement & Weight Change Request for 2-Cycle 6 Cylinder #31609weight
  • AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other
  • AS Request Pontiac GTO tire size change #30881weight
Indianapolis Motor Speedway Runoffs 20212021-09-251:29.011Lee Alexander · fastest of 13 · top 5 within 2.5s-1.783s (-1.96%)1:29.225Lee Alexander · fastest of 12 · top 5 within 3.5s-2.274s (-2.49%)160.1Jason Miller1:50.427Drew 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+21.381squal +21.416s124.0%qual 124.1%
25 rule changes (P1: 11, AS: 14)10 weight · 8 engine · 3 cars added · 1 induction · 2 wording · 1 othershowhide
  • P1 Move 2000cc and 2300cc engine options to individual spec lines #31012engine
  • P1 E&O Spec Line B notes #31095weight
  • P1 Add 1355cc spec line #30890weight
  • 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
  • P1 E&O tonneau cover provision in cockpit opening section #30458other
  • P1 Update Spec Line B Notes #30498weight
  • P1 Update Spec Lines C and G notes #30499weight
  • P1 E&O Maximum Valves Per Cylinder #30559engine
  • P1 Clean up Spec Line A notes section #30424engine
  • P1 Clean up Spec Line H notes section #30425engine
  • 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
  • P1 DP02 Sealed 2ltr Engine Option #30038engine
  • P1 E&O restrictor terminology #30285induction
  • AS Request for 2015 -2017 Ford Mustang Spec Line #29514cars added
  • AS Request Trunk lid / Rear Hatch clarification #29591wording
  • AS Common Weight for CTS-V Tire #29759weight
  • AS Correction to specifications inadvertently deleted #30041cars added
  • AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine
  • AS Rule simplification spec line communization #29824weight
Road America Runoffs 20202020-10-022:01.101James French · fastest of 18 · top 5 within 1.1s2:01.870James French · fastest of 17 · top 5 within 1.8s159.7David Locke2:27.045Gregory Eaton · fastest of 18 · top 5 within 0.6s2:27.668Gregory Eaton · fastest of 15 · top 5 within 1.5s149.2Gregory Eaton+25.798squal +25.944s121.2%qual 121.4%
20 rule changes (P1: 4, AS: 16)4 induction · 4 weight · 3 engine · 2 cars added · 2 suspension & brakes · 2 tyres & wheels · 1 aero · 2 othershowhide
  • AS Dodge Challenger AS Spec Line Clarification #28698induction
  • AS Dodge Challenger AS Spec Line Clarification #2 #28699aero
  • 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
  • AS weight adjustments for 2020 season #28785weight -50 lbs
  • P1 E&O minimum weights and intake manifolds #28731induction
  • 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
  • P1 Extend date for removing sealed DP02-spec 2.0L option #28046weight
  • P1 Remove sealed DP02-spec 2.0 MZR spec #26753induction
  • P1 Update Revised Spec Line F #27745weight
Virginia International Raceway Runoffs 20192019-10-051:42.674Todd Slusher · fastest of 14 · top 5 within 1.5s1:43.498Todd Slusher · fastest of 13 · top 5 within 1.0s155.9Jim Devenport2:02.938Gregory Eaton · fastest of 17 · top 5 within 0.8s2:03.900James Jost · fastest of 16 · top 5 within 2.1s153.9James Jost+20.402squal +20.264s119.7%qual 119.7%
18 rule changes (P1: 14, AS: 4)5 engine · 3 induction · 1 cars added · 1 removed · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 2 wording · 3 othershowhide
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other
  • AS Request Ride Height Clarification #26598suspension & brakes
  • P1 E&O Transmissions #27098other
  • P1 E&O Transmissions #27005tyres & wheels
  • P1 Move minimum height provision to #27031removed
  • P1 Remove duplicative fender louver provision #27033induction
  • AS Request to Revert to 2017 Weights #25885weight
  • P1 Missing word E&O #26919other
  • P1 E&O correction to GCR 9.1.8.C.C. #26927wording
  • P1 Clean up reference to engine table #26648engine
  • P1 Remove redundant spec line #26692engine
  • P1 Clean Up Engine Table Language #26590engine
  • P1 Move single-seat closed cockpit provision to #26376wording
  • AS SMG Mustang eligibility in American sedan #26224cars added
  • P1 Correct errors in GCR section 9.1.8.C.J #26144engine
  • P1 Remove redundant inlet restrictor provisions #25877induction
  • P1 Clarify Honda K20A-FD2 parts requirement #25949engine
  • P1 Correct GCR section 9.1.8.C.J errors #25966induction
Sonoma Raceway Runoffs 20182018-10-101:27.714Todd Slusher · fastest of 19 · top 5 within 2.1s1:28.786Perry Richardson · fastest of 19 · top 5 within 0.9s144.0Johnnie Crean1:47.782Andrew McDermid · fastest of 12 · top 5 within 1.9s1:50.345John Heinricy · fastest of 10 · top 5 within 2.3s105.0Kevin Fandozzi+21.559squal +20.068s124.3%qual 122.9%
No rule changes on record between these events
Indianapolis Motor Speedway Runoffs 20172017-09-251:30.794Jim Devenport · fastest of 19 · top 5 within 2.8s1:31.499Jim Devenport · fastest of 16 · top 5 within 2.2s1:45.220James Jost · fastest of 29 · top 5 within 6.7s1:51.507Bryan Long · fastest of 28 · top 5 within 0.9s+20.008squal +14.426s121.9%qual 115.9%
No rule changes on record between these events
Mid-Ohio Sports Car Course Runoffs 20162016-09-191:17.308James Devenport · fastest of 14 · top 5 within 2.7s1:19.407Gianpaolo Ciancimino · fastest of 13 · top 5 within 1.8s1:30.651Tom Sloe · fastest of 22 · top 5 within 3.6s1:33.424Edward Hosni · fastest of 20 · top 5 within 1.0s+14.017squal +13.343s117.7%qual 117.3%
No rule changes on record between these events
Daytona International Speedway Runoffs 20152015-09-211:49.219Jim Downing · fastest of 9 · top 5 within 2.2s1:49.792Gianpaolo Ciancimino · fastest of 10 · top 5 within 1.7s2:01.746Tom Sloe · fastest of 22 · top 5 within 2.6s2:02.922Andy McDermid · fastest of 19 · top 5 within 2.2s+13.130squal +12.527s112.0%qual 111.5%

By track

TrackEvents Typical % of P1 Best Latest 
Road America4100.0%2 of 4 with P1100.0%Runoffs 2020100.0%Runoffs 2024
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 P1'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.