BoP Lab / Michelin Raceway Road Atlanta

AS vs SRF vs SMX vs P1 pace at Michelin Raceway Road Atlanta

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.

Quickest here: AS 1:34.231 Tom Ellis, Super Tour Mar 2021 qualifying · SMX 1:38.517 Jarrett Jones, Super Tour Mar 2026 qualifying · P1 1:17.524 Chip Romer, Super Tour Mar 2022 race

% of ASLap times

ASSRFSMXP1solid race · dashed qualifying · slower is lower

ASSRFSMXP1solid 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

	Event	AS			SRF					SMX					P1
	Event	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
	Super Tour Mar 2026 ST26MAR062026-03-06	2:28.404Michael Kamalian · only car+52.937s (+55.45%)	1:34.642Michael Kamalian · only car-0.709s (-0.74%)	140.9Michael Kamalian+2.4 mph (+1.7%)						1:38.517Jarrett Jones · fastest of 20 · top 5 within 0.7s-0.145s (-0.15%)	1:41.144Skyler Cottrell · fastest of 21 · top 5 within 0.5s+2.379s (+2.41%)	120.7Elivan Goulart+3.7 mph (+3.2%)	+6.502squal -49.887s	106.9%qual 66.4%
19 rule changes (AS: 11, SRF: 4, SMX: 4)4 weight · 3 engine · 2 induction · 1 removed · 1 tyres & wheels · 1 wording · 7 othershowhide 2026-03-01 AS Re-Organization of AS Spec lines for 2026 #39887removed 2026-03-01 SRF SRF3 Spark Plugs #39899other 2026-02-01 AS Edelbrock manifold (& timing kit) to Chevy LS Spec Lines Request #39055weight 2026-01-01 AS Restrictor Plate Change for Gen 2 Ford Coyote Engine #39501induction 2025-12-01 AS 1994 Mustang Spec Line Request #39104engine 2025-11-01 AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs 2025-10-01 SRF Add HD Oil Cooler #38979other 2025-07-01 AS RE: Previous Letter 37695 Update #38245weight -75 lbs 2025-06-01 AS Errors and Omissions #38234engine 2025-06-01 SMX SMX Data Submission - Penalties #38248other 2025-06-01 SMX SMX Penaly Clarification updated language #38337wording 2025-05-01 AS Errors and Omission #38055induction 2025-05-01 AS Request to Add LS1/LS6 Intakes for 5.3L Truck Engine EnO #38197engine 2025-05-01 SMX Clarify Tire Marking Regs #38004tyres & wheels 2025-05-01 SMX SMX Data Submission Timeframe #38039other 2025-04-01 AS Flotek Head Plunge Cut Inconsistencies #37502other 2025-04-01 AS Notes clean up #37693weight 2025-04-01 SRF Driver Safety & Comfort #37966other 2025-04-01 SRF Update SADEV transmission specs #37992other
	Super Tour Mar 2025 ST25MAR072025-03-07	1:35.467Thomas J Ellis · fastest of 4 · top 4 within 2.7s-8.834s (-8.47%)	1:35.351Thomas J Ellis · fastest of 4 · top 4 within 1.1s-24.914s (-20.72%)	138.6James Jost+8.6 mph (+6.6%)						1:38.662Camden Gruber · fastest of 30 · top 5 within 0.2s-0.302s (-0.31%)	1:38.765Skyler Cottrell · fastest of 30 · top 5 within 0.5s-1.159s (-1.16%)	117.0Cam Ebben+1.0 mph (+0.9%)	+3.414squal +3.195s	103.6%qual 103.3%
24 rule changes (AS: 12, SRF: 6, SMX: 5, P1: 1)6 engine · 4 tyres & wheels · 3 cars added · 2 suspension & brakes · 1 induction · 1 weight · 2 wording · 5 othershowhide 2025-03-01 AS Race memo #37902engine 2025-01-01 AS Increase Coyote Engine Restrictor to 80mm #36177induction 2025-01-01 AS Performance Pack for 2015+ Mustang #36867weight 2025-01-01 AS Gear Ratios #37131engine 2025-01-01 AS ECU specs for LS engine #37208engine 2024-12-01 SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other 2024-10-01 SRF Update SRF3 Air Filter Rule #36681other 2024-10-01 SRF Update SRF Brake Rotor Thickness #36687suspension & brakes 2024-10-01 SRF Hoosier Tire Decal Placement #36739tyres & wheels 2024-09-01 AS Mustang transmission ratios #36662engine 2024-09-01 SMX SMX Camera Rule Correction #36496wording 2024-09-01 SMX AIM ECU Protocol #36556engine 2024-09-01 SMX OE versus OEM Definitons #36608other 2024-09-01 SMX Shifter Bushing #36611suspension & brakes 2024-09-01 SRF Protest Fee Clarification #36540wording 2024-09-01 SRF Update to Letter 36619 with new Hoosier Contingency Decal Info #36624tyres & wheels 2024-08-01 SRF Update Rain Tire Rule and Hoosier Decal Placement #36436tyres & wheels 2024-06-01 AS Request for Classification of 2018-2023 mustang In #35764cars added 2024-05-01 AS 6th gen Camaro limited prep #35733cars added 2024-05-01 AS Chevrolet/Pontiac Camaro & Firebird (82-92) 5.7L V8 LS1 Alum BLK #35825cars added 2024-05-01 AS Full Prep Head #35891other 2024-05-01 P1 Update GCR section 9.1.8.B.J.7 #35907engine 2024-04-01 AS Restricted Prep Aftermarket Parts Request #35682other 2024-04-01 AS Allowance of 11 #35824tyres & wheels
	Super Tour Mar 2024 ST24MAR082024-03-08	1:44.301Phillip Waters · only car+7.955s (+8.26%)	2:00.265Phillip Waters · only car+24.272s (+25.29%)	130.0Phillip Waters-13.7 mph (-9.5%)						1:38.964Michael Tinis · fastest of 33 · top 5 within 0.5s	1:39.924Will Robusto · fastest of 33 · top 5 within 1.1s	116.0Jack Murchison	-20.341squal -5.337s	83.1%qual 94.9%	1:19.119Todd Vanacore · fastest of 3 · top 3 within 18.1s+0.997s (+1.28%)	1:19.924John Mcaleer · fastest of 3 · top 3 within 17.8s-0.977s (-1.21%)	139.8John Mcaleer-12.4 mph (-8.2%)	-40.341squal -25.182s	66.5%qual 75.9%
23 rule changes (AS: 8, SRF: 6, P1: 9)5 tyres & wheels · 4 induction · 3 cars added · 3 engine · 3 suspension & brakes · 3 weight · 2 othershowhide 2024-03-01 AS Request to Classify 1970-1981 Camaro and Firebird in AS #33659cars added 2024-03-01 AS Fuel Cell 12 #34194other 2024-03-01 AS Please Classify the 6th Gen Into AS. #35448cars added 2024-03-01 AS spec lines #35713cars added 2024-03-01 P1 Remove redundant effective date language in GCR 9.1.8.B.J.4 #35693induction 2024-03-01 P1 Correct engine series terminology #35694engine 2024-01-01 P1 Please correct omitted punctuation #34890weight 2024-01-01 P1 Adjust restrictors and weights for Engine Table lines H and I #35229induction 2024-01-01 P1 Revise Group CN Honda K20A-FD2 Spec Line #35337weight 2024-01-01 SRF Update SRF Rain / Brake Rule #34706suspension & brakes 2024-01-01 SRF Update SRF Brake Light Rule v1 #34853suspension & brakes 2024-01-01 SRF SRF / SRF3 Rule Updates #35268weight 2023-10-01 SRF SRF Radiator Rule Update #34805other 2023-08-01 AS Crate Motor Part Numbers #32944engine 2023-08-01 AS Request wheel size change #33007tyres & wheels 2023-08-01 AS Alternative Upper Front Control Arms for Dodge Challenger #33352engine 2023-08-01 AS Front Brake Caliper Adapters for Dodge Challenger #33353suspension & brakes 2023-07-01 P1 SIR Testing #34354induction 2023-07-01 P1 E&O Single Inlet Restrictor abbreviation, etc. #34369induction 2023-07-01 P1 E&O Clean up ducted air provision #34410tyres & wheels 2023-06-01 SRF Hoosier SRF Wet Front Tire Rule Update #34189tyres & wheels 2023-05-01 SRF Update SRF Front W2 Rain Tire Part Number #34118tyres & wheels 2023-04-01 P1 E&O - Correct dimensional equivalents #34018tyres & wheels
	Super Tour Mar 2023 ST23MAR102023-03-10														1:18.122Todd Vanacore · fastest of 5 · top 5 within 13.9s+0.356s (+0.46%)	1:20.901Todd Vanacore · fastest of 3 · top 3 within 151.3s+3.377s (+4.36%)	152.2Jean-Luc Liverato-0.8 mph (-0.5%)
11 rule changes (AS: 3, SRF: 3, P1: 5)2 aero · 2 induction · 2 suspension & brakes · 2 tyres & wheels · 1 weight · 1 wording · 1 othershowhide 2023-03-01 P1 November 2022 Rules Clarification for Suspension Covers #33615aero 2023-03-01 SRF Update SRF Brake Rule #33469suspension & brakes 2022-11-01 P1 Clarify body panel coverage of suspension components #33318aero 2022-10-01 P1 E&O clarification regarding forced induction #33123induction 2022-09-01 AS Request to add Hoosier W2 #33031other 2022-09-01 AS correction of Dodge Challenger specification line #33151wording 2022-08-01 P1 Clarify authorization to use flat plate intake restrictor #32964induction 2022-07-01 AS Request CTS-V Spec Line Error Correction #30242weight 2022-06-01 SRF SRF Tire Rule Update #32614tyres & wheels 2022-06-01 SRF Brake, seal, and air filter clarifications #32670suspension & brakes 2022-05-01 P1 E&O Clarification of Bodywork Rules #32468tyres & wheels
	Super Tour Mar 2022 ST22MAR122022-03-12	1:36.346Gregory Eaton · fastest of 3 · top 3 within 7.0s+2.115s (+2.24%)	1:35.993Gregory Eaton · fastest of 2+1.259s (+1.33%)	143.6Gregory Eaton-19.3 mph (-11.9%)											1:17.766Chip Romer · fastest of 5 · top 5 within 2.3s-0.095s (-0.12%)	1:17.524Chip Romer · fastest of 5 · top 5 within 2.3s-0.895s (-1.14%)	153.0John Mcaleer+0.9 mph (+0.6%)	-18.469squal -18.580s	80.8%qual 80.7%
26 rule changes (AS: 11, SRF: 5, P1: 10)11 weight · 6 engine · 1 cars added · 1 suspension & brakes · 1 tyres & wheels · 2 wording · 4 othershowhide 2022-01-01 AS Proposed Revisions to SCCA GCR 2021 Appendix M, Part 3 #30295other 2022-01-01 AS specification line consolidation and correction #31846wording 2022-01-01 AS correction of SMG specification line #31847suspension & brakes 2022-01-01 AS Alternate cylinder heads for full prep engine builds - Evaluation #31851engine 2022-01-01 P1 Displacement & Weight Change Request for 2-Cycle 6 Cylinder #31609weight 2021-12-01 SRF Three Updates to SRF Rules #31523weight 2021-10-01 AS Request for adjustable Front Upper Control Arms on 4th Gen F-Body #30457other 2021-10-01 AS Request Pontiac GTO tire size change #30881weight 2021-09-01 P1 Move 2000cc and 2300cc engine options to individual spec lines #31012engine 2021-09-01 P1 E&O Spec Line B notes #31095weight 2021-08-01 P1 Add 1355cc spec line #30890weight 2021-08-01 SRF SRF Wet Tires #30849tyres & wheels 2021-08-01 SRF SADEV-SRF3 Transmission #30926other 2021-08-01 SRF SRF Update Maintenance, Repairs and Seals #30961engine 2021-06-01 AS Request CTS-V Spec Line Error Correction #30242weight 2021-06-01 AS Request to consolidate SN95 Mustang '94-'04 Mustang spec lines #30428cars added 2021-06-01 AS American Sedan Transmission Rule Change Request #30595weight 2021-06-01 AS Correction to specifications inadvertently deleted #30691wording 2021-06-01 AS weight adjustments #30700weight +50 lbs 2021-06-01 SRF SRF3 Alternator Pulley #30684weight 2021-05-01 P1 E&O tonneau cover provision in cockpit opening section #30458other 2021-05-01 P1 Update Spec Line B Notes #30498weight 2021-05-01 P1 Update Spec Lines C and G notes #30499weight 2021-05-01 P1 E&O Maximum Valves Per Cylinder #30559engine 2021-04-01 P1 Clean up Spec Line A notes section #30424engine 2021-04-01 P1 Clean up Spec Line H notes section #30425engine
	Super Tour Mar 2021 ST21MAR192021-03-19	1:34.231Tom Ellis · fastest of 7 · top 5 within 7.4s	1:34.734Tom Ellis · fastest of 8 · top 5 within 5.6s	163.0Tom Ellis											1:17.861John Mcaleer · fastest of 5 · top 5 within 7.0s	1:18.419John Mcaleer · fastest of 5 · top 5 within 6.9s	152.1John Mcaleer	-16.315squal -16.370s	82.8%qual 82.6%
57 earlier rule changes on record, in force before Super Tour Mar 2021 (from 2019)13 engine · 9 weight · 8 induction · 6 suspension & brakes · 5 cars added · 4 tyres & wheels · 1 aero · 1 removed · 3 wording · 7 othershowhide 2021-03-01 AS AS Mustang LP 4.6 3V Classification Transmission Request #29886weight 2021-03-01 AS Request CF driveshaft on CTS-V for durability improvement #30117engine 2021-03-01 AS Adjustment to model years of 5th generation RP Camaro #30348engine 2021-03-01 P1 DP02 Sealed 2ltr Engine Option #30038engine 2021-03-01 P1 E&O restrictor terminology #30285induction 2021-03-01 SRF Mandatory identification: #30223engine 2021-01-01 AS Request for 2015 -2017 Ford Mustang Spec Line #29514cars added 2021-01-01 AS Request Trunk lid / Rear Hatch clarification #29591wording 2021-01-01 AS Common Weight for CTS-V Tire #29759weight 2021-01-01 AS Correction to specifications inadvertently deleted #30041cars added 2020-12-01 AS Request Additional Engine Options for Dodge Challenger Spec Line #29543engine 2020-12-01 AS Rule simplification spec line communization #29824weight 2020-12-01 SRF SRF Shocks, Springs and Ride Height. #29688suspension & brakes 2020-08-01 AS Dodge Challenger AS Spec Line Clarification #28698induction 2020-08-01 AS Dodge Challenger AS Spec Line Clarification #2 #28699aero 2020-07-01 AS Support for R-Type Specification Tires #27450tyres & wheels 2020-07-01 AS Spec Tire Request #27519tyres & wheels 2020-07-01 AS Restrictor Plate Change for RP 2011+ Mustang with Coyote Engine #27675induction 2020-07-01 AS 2005-2009 Restricted Prep 4.6 3V #27908engine 2020-07-01 AS Request for 2005-2009 Restricted Prep 4.6 3V Parts #27909engine 2020-07-01 AS Request for Full Preparation Classification for 2010-2014 Camaro #28030other 2020-07-01 AS Cylinder Heads #28696engine 2020-07-01 AS Request for Max Rotor Diameter Change #28748suspension & brakes 2020-07-01 AS Request increase rotor diameter #28797other 2020-05-01 AS weight adjustments for 2020 season #28785weight -50 lbs 2020-05-01 P1 E&O minimum weights and intake manifolds #28731induction 2020-05-01 SRF SRF Bump Stop Correction #27019suspension & brakes 2020-02-01 AS Rear Trailing Arms #28007suspension & brakes 2020-02-01 AS Weight reduction for cars running iron heads #28010weight 2020-02-01 AS 05-10 Mustang with HR cam classification #28226cars added 2020-02-01 AS 10-15 Camaro Full Prep classification #28227cars added 2020-02-01 P1 Extend date for removing sealed DP02-spec 2.0L option #28046weight 2020-01-01 P1 Remove sealed DP02-spec 2.0 MZR spec #26753induction 2020-01-01 P1 Update Revised Spec Line F #27745weight 202-01-01 SRF SRF Rain / Brake Rule - BoD approved as follows #34958suspension & brakes 2019-12-01 SRF SRF Tire Warmer Rule #27622tyres & wheels 2019-12-01 SRF SRF / SRF3 Nose Weight Reduction #27706weight 2019-12-01 SRF SRF / SRF3 Majors & Regional Class Updates #27723other 2019-10-01 AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other 2019-08-01 AS Request Ride Height Clarification #26598suspension & brakes 2019-08-01 P1 E&O Transmissions #27098other 2019-07-01 P1 E&O Transmissions #27005tyres & wheels 2019-07-01 P1 Move minimum height provision to #27031removed 2019-07-01 P1 Remove duplicative fender louver provision #27033induction 2019-07-01 SRF SRF Dash Windscreen Kit #27028other 2019-05-31 AS Request to Revert to 2017 Weights #25885weight 2019-05-31 P1 Missing word E&O #26919other 2019-05-31 P1 E&O correction to GCR 9.1.8.C.C. #26927wording 2019-05-01 P1 Clean up reference to engine table #26648engine 2019-05-01 P1 Remove redundant spec line #26692engine 2019-04-01 P1 Clean Up Engine Table Language #26590engine 2019-03-01 P1 Move single-seat closed cockpit provision to #26376wording 2019-02-01 AS SMG Mustang eligibility in American sedan #26224cars added 2019-02-01 P1 Correct errors in GCR section 9.1.8.C.J #26144engine 2019-01-01 P1 Remove redundant inlet restrictor provisions #25877induction 2019-01-01 P1 Clarify Honda K20A-FD2 parts requirement #25949engine 2019-01-01 P1 Correct GCR section 9.1.8.C.J errors #25966induction

About this data

Best is the class's fastest lap in that event's qualifying or race sessions, with the driver who set it, how many cars set a time that session and how close the top five were; a best from fewer than three cars is greyed. With two or more classes, "vs" is the gap of each class's best to the first class's at the same event. "% of AS" is the class's best as a share of AS's best at the same event (100% is level, less is quicker): weather and track condition move every class together, so this compares across years where the raw times do not. It still breaks when AS's own field changes or one session was wet and another dry. Newest event first. The coloured figure under each value is the change from the previous event that has one (green is quicker, red slower). Whole laps only, so events with different sector layouts still compare. Weather and track condition are not accounted for.