BoP Lab / Michelin Raceway Road Atlanta

STL vs AS vs SM pace at Michelin Raceway Road Atlanta

Lap times across years say as much about the weather as the class. % of STL is each class's best lap as a share of STL'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: STL 1:35.976 Danny Steyn, Super Tour Mar 2022 qualifying · AS 1:34.231 Tom Ellis, Super Tour Mar 2021 qualifying · SM 1:41.798 Danny Steyn, Super Tour Mar 2021 qualifying

% of STLLap times

STLASSMsolid race · dashed qualifying · slower is lower

STLASSMsolid race · dashed qualifying · each class's best lap as a share of STL's at the same event (the reference class, changeable above); 100% is level, less is quicker, so up the chart is quicker

	Event	STL			AS					SM
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs STL	% of STL	Qual best	Race best	Trap	vs STL	% of STL
	Super Tour Mar 2026 ST26MAR062026-03-06	1:37.000Danny Steyn · fastest of 15 · top 5 within 1.6s+0.012s (+0.01%)	1:40.349Chuck Hines · fastest of 14 · top 5 within 6.3s+2.897s (+2.97%)	126.5Derek Ketchie+6.5 mph (+5.4%)	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%)	-5.707squal +51.404s	94.3%qual 153.0%	1:42.324Skyler Cottrell · fastest of 52 · top 5 within 0.4s-0.524s (-0.51%)	1:43.866Brett Kowalski · fastest of 51 · top 5 within 2.4s+1.241s (+1.21%)	112.2James Newell+5.2 mph (+4.9%)	+3.517squal +5.324s	103.5%qual 105.5%
17 rule changes (STL: 3, AS: 11, SM: 3)7 weight · 3 engine · 2 induction · 1 removed · 1 tyres & wheels · 1 wording · 2 othershowhide 2026-03-01 AS Re-Organization of AS Spec lines for 2026 #39887removed 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 2026-01-01 STL Weight adjustment for STL #39579weight 2025-12-01 AS 1994 Mustang Spec Line Request #39104engine 2025-11-01 AS Cadillac CTS-V BOP Weight Change #38640weight -50 lbs 2025-08-01 STL Lotus Weight Reduction #38772weight -50 lbs 2025-07-01 AS RE: Previous Letter 37695 Update #38245weight -75 lbs 2025-06-01 AS Errors and Omissions #38234engine 2025-06-01 SM SMX Data Submission - Penalties #38248other 2025-06-01 SM 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 SM Clarify Tire Marking Regs #38005tyres & wheels 2025-05-01 STL E&O: SMX Allowance in STL #37945weight 2025-04-01 AS Flotek Head Plunge Cut Inconsistencies #37502other 2025-04-01 AS Notes clean up #37693weight
	Super Tour Mar 2025 ST25MAR072025-03-07	1:36.988Mike Taylor · fastest of 13 · top 5 within 2.0s+0.632s (+0.66%)	1:37.452Mike Taylor · fastest of 11 · top 5 within 2.4s+0.599s (+0.62%)	120.1Derek Ketchie+1.7 mph (+1.5%)	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%)	-2.101squal -1.521s	97.8%qual 98.4%	1:42.848Sean Noonan · fastest of 35 · top 5 within 0.2s+0.228s (+0.22%)	1:42.625Sean Noonan · fastest of 33 · top 5 within 0.6s-0.370s (-0.36%)	107.0Sean Noonan+1.8 mph (+1.7%)	+5.173squal +5.860s	105.3%qual 106.0%
18 rule changes (STL: 1, AS: 12, SM: 5)5 engine · 3 cars added · 2 tyres & wheels · 1 induction · 1 suspension & brakes · 1 weight · 1 wording · 4 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 SM E&O SMX Regs 9.1.7.1.D.5.u-.w #37070other 2024-12-01 STL Request to Remove Miata Hubs from General category #37138tyres & wheels 2024-09-01 AS Mustang transmission ratios #36662engine 2024-09-01 SM SMX Camera Rule Correction #36496wording 2024-09-01 SM AIM ECU Protocol #36556engine 2024-09-01 SM OE versus OEM Definitons #36608other 2024-09-01 SM Shifter Bushing #36611suspension & brakes 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 2024-04-01 AS Restricted Prep Aftermarket Parts Request #35682other 2024-04-01 AS Allowance of 11 #35824tyres & wheels
	Super Tour Mar 2024 ST24MAR082024-03-08	1:36.356Danny Steyn · fastest of 15 · top 5 within 3.3s-0.113s (-0.12%)	1:36.853Danny Steyn · fastest of 17 · top 5 within 2.8s-1.935s (-1.96%)	118.3Mike Taylor-5.9 mph (-4.7%)	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%)	+23.412squal +7.945s	124.2%qual 108.2%	1:42.620Danny Steyn · fastest of 47 · top 5 within 0.4s+0.001s (+0.00%)	1:42.995Charles Mactutus · fastest of 46 · top 5 within 0.1s-1.102s (-1.06%)	105.2Tyler Brown-6.5 mph (-5.8%)	+6.142squal +6.264s	106.3%qual 106.5%
13 rule changes (STL: 5, AS: 8)3 cars added · 2 engine · 2 induction · 2 tyres & wheels · 1 suspension & brakes · 1 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 2024-02-01 STL ST Electric-Assisted Steering Systems #35066other 2024-02-01 STL BOP Adjustments #35112weight 2024-02-01 STL Mazda 12A #35320induction 2024-01-01 STL Alternate Carburetor Request for 79-85 RX7 12a #35181induction 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 2023-06-01 STL Clarify STL table B - IT spec notes on Tires #34187tyres & wheels
	Super Tour Mar 2023 ST23MAR102023-03-10	1:36.469Danny Steyn · fastest of 16 · top 5 within 3.9s+0.493s (+0.51%)	1:38.788Chuck Hines · fastest of 17 · top 5 within 7.5s+1.426s (+1.46%)	124.2Chuck Hines-2.2 mph (-1.7%)						1:42.619Charles Mactutus · fastest of 48 · top 5 within 0.7s-0.195s (-0.19%)	1:44.097Brian Henderson · fastest of 47 · top 5 within 0.5s+2.233s (+2.19%)	111.7Peter Ensor-1.7 mph (-1.5%)	+5.309squal +6.150s	105.4%qual 106.4%
6 rule changes (STL: 1, AS: 3, SM: 2)2 weight · 1 suspension & brakes · 1 tyres & wheels · 1 wording · 1 othershowhide 2023-01-01 SM BOP for NB1 and NB2 #32309weight 2023-01-01 STL Spec MX5 in STL #33473tyres & wheels 2022-09-01 AS Request to add Hoosier W2 #33031other 2022-09-01 AS correction of Dodge Challenger specification line #33151wording 2022-07-01 AS Request CTS-V Spec Line Error Correction #30242weight 2022-04-01 SM Update GCR Section 9.1.7.3.A.1. #32217suspension & brakes
	Super Tour Mar 2022 ST22MAR122022-03-12	1:35.976Danny Steyn · fastest of 18 · top 5 within 2.9s-0.449s (-0.47%)	1:37.362Danny Steyn · fastest of 18 · top 5 within 1.4s+0.557s (+0.58%)	126.3Trever Degioanni+2.5 mph (+2.1%)	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%)	-1.369squal +0.370s	98.6%qual 100.4%	1:42.814Connor Zilisch · fastest of 60 · top 5 within 0.3s+1.016s (+1.00%)	1:41.864Travis Wiley · fastest of 60 · top 5 within 0.7s-0.700s (-0.68%)	113.5Junior Brock-0.1 mph (-0.1%)	+4.502squal +6.838s	104.6%qual 107.1%
23 rule changes (STL: 11, AS: 11, SM: 1)5 weight · 3 induction · 2 cars added · 2 engine · 2 suspension & brakes · 1 tyres & wheels · 4 wording · 4 othershowhide 2022-03-01 STL Single TB Weight Modifiers #31449weight 2022-03-01 STL Improved Touring Tires #32063tyres & wheels 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 STL Throttling Device Clarification #31323induction 2022-01-01 STL Mazda Renesis Restriction #31467induction 2022-01-01 STL Clarification of 79-85 RX7 Spec line #31621wording 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 STL Request to clean up Spec MX-5 Redundancy #31069other 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 STL VW Engine Request #30625engine 2021-05-01 STL Solstice Ride Height #30183suspension & brakes 2021-05-01 STL Request Mazda B5 DOHC #30420cars added 2021-05-01 STL Honda B16A (JDM) Restrictor change #30531induction 2021-04-01 SM Updates - Obsolete Parts & BOP Parts #30438other 2021-04-01 STL ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording
	Super Tour Mar 2021 ST21MAR192021-03-19	1:36.425Danny Steyn · fastest of 24 · top 5 within 3.0s	1:36.805Danny Steyn · fastest of 22 · top 5 within 3.1s	123.8Eric Diaz	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	-2.071squal -2.194s	97.9%qual 97.7%	1:41.798Danny Steyn · fastest of 68 · top 5 within 0.7s	1:42.564Preston Pardus · fastest of 67 · top 5 within 0.2s	113.6Marc Cefalo	+5.759squal +5.373s	105.9%qual 105.6%
66 earlier rule changes on record, in force before Super Tour Mar 2021 (from 2019)14 weight · 12 engine · 9 induction · 7 cars added · 7 suspension & brakes · 5 tyres & wheels · 4 aero · 4 wording · 4 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 STL GM Ecotec engines in STL #30247engine 2021-03-01 STL Super Touring Alternate Miata Hubs #30345tyres & wheels 2021-02-01 STL Brake Component Relocation #29990suspension & brakes 2021-02-01 STL Super Touring Wing Clarification #30111aero 2021-02-01 STL Transmission Options #30118other 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 2021-01-01 STL Request for FWD and RWD Parity #29728weight 2021-01-01 STL Request to Remove Honda F20C 2% Weight Penalty #29815weight 2021-01-01 STL Request for FWD and RWD Parity #30023induction 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 STL Request clarification on wing measurement #29640aero 2020-10-01 SM Radiator E&O Clarifications #29294engine 2020-08-01 AS Dodge Challenger AS Spec Line Clarification #28698induction 2020-08-01 AS Dodge Challenger AS Spec Line Clarification #2 #28699aero 2020-08-01 SM Modifications to prevent failures of Rear Brake Caliper Pin #28953suspension & brakes 2020-08-01 STL Minimum Weight Determination #27695weight 2020-08-01 STL ST Gurney flap Wicker clarification #29012aero 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 2020-07-01 STL Request for Addition to GT3 Approved Turbo List #27576induction 2020-06-01 STL Request to add 2016-2019 GMX-5 Spec line #28604cars added 2020-06-01 STL Request to update PN for MX-5 #28622wording 2020-06-01 STL Correction - Clarification Honda/Acura B18B engine Letter # 26209 #28873engine 2020-05-01 AS weight adjustments for 2020 season #28785weight -50 lbs 2020-05-01 STL STL Honda B18 restrictor changes #28794induction 2020-04-01 STL Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0 #27884engine 2020-04-01 STL Acura/Honda B18C engine chart. Reduce the current 54 mm flat plat #28663induction 2020-04-01 STL Mazda MZR engine chart. Reduce the current 55 mm flat plate to 53 #28664induction 2020-03-01 STL Request to add wheel part numbers #28342tyres & wheels 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 2019-10-01 AS Request to add SMG to 9.1.6.B.1 AS Intent #27140other 2019-10-01 STL Request to Classify Spec MX-5 Challenge in STL #27399cars added 2019-08-01 AS Request Ride Height Clarification #26598suspension & brakes 2019-07-01 STL Request clarification for manifold and throttle in STU #27004induction 2019-05-31 AS Request to Revert to 2017 Weights #25885weight 2019-05-31 STL Request Restrictor Plate correction #26779induction 2019-05-01 STL Request Ride Height Clarification #26597suspension & brakes 2019-03-01 SM Request to allow aftermarket fuel filters. #26370wording 2019-03-01 STL Request to Allow VW 1.8L Engine #25614engine 2019-03-01 STL Request to reduce weight of RX8 with Renesis rotary #25781weight -100 lbs 2019-03-01 STL Request for Open Brake Pads On Mazda MX-5 Cup NC #25821suspension & brakes 2019-03-01 STL Request to clarify B18C1 GSR Honda B motor table #26209weight 2019-03-01 STL Port Matching #26415wording 2019-02-01 AS SMG Mustang eligibility in American sedan #26224cars added 2019-02-01 SM Request 99-00 replacement Wire harnesses #25602engine 2019-02-01 SM Organize and Clarify 9.1.7.C.1.o. #25913weight 2019-02-01 SM Strike Tire Tread Language #26123tyres & wheels 2019-01-01 STL Request to equalize FPR Reduction on all B-Series Vtec Engines #24746weight 2019-01-01 STL Request E&O for Mazda Miata Spec Line #25955weight

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 STL" is the class's best as a share of STL'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 STL'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.