BoP Lab / Michelin Raceway Road Atlanta
STL vs SMX 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 · SMX 1:38.517 Jarrett Jones, Super Tour Mar 2026 qualifying · SM 1:41.798 Danny Steyn, Super Tour Mar 2021 qualifying
| Event | STL | SMX | SM | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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%) | 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%) | +0.795squal +1.517s | 100.8%qual 101.6% | 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% | ||
10 rule changes (STL: 3, SMX: 4, SM: 3)2 weight · 6 wording · 2 other · STL minimum weights increase across all engine sizes, 1300cc to 1850cc up to 195–250 lbs. · Lotus Evora GT4 minimum weight drops to 2700 lbs; Elise Cup R to 2250 lbs; Elise SC and Exige SC to 2450–2550 lbs. · SMX drivers must submit data acquisition files on time or face suspension and $250 fine. · SMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fines, level 2 and 4 may carry $500 fines. · SMX drivers must submit data acquisition files on time or face suspension and $250 fine. · SMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fines, level 2 and 4 may carry $500 fines. · SM tire marking rules clarified: one Hoosier SM 7.5 P205/50/ZR17 set per Super Tour weekend, impound after first dry session, damaged tires may be replaced with used tires only. · SMX tire marking rules clarified: one set Toyo RR P235/40/ZR17 per weekend, impound after first dry session, damaged tires may be replaced with used only. · SMX competitors must submit AiM data files within 60 minutes instead of 30 after timed sessions. · STL Mazda MX5 Challenge minimum weight now references GCR 9.1.7.1; mandatory component spec list removed, alternative tires only allowed.show
| |||||||||||||||
| 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%) | 1:38.662Camden 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%) | +1.313squal +1.674s | 101.3%qual 101.7% | 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% | ||
11 rule changes (STL: 1, SMX: 5, SM: 5)2 engine · 1 cars added · 6 wording · 2 other · SMX OE instrument cluster must stay unmodified and connected; aftermarket dash allowed if wiring only re-routed; alternate gauges now permitted; foot pedal comfort mods allowed without relocation. · SMX OE instrument cluster must stay unmodified and connected; aftermarket dash allowed if wiring only re-routed; alternate gauges now permitted; foot pedal comfort mods allowed without relocation. · STL STU Mazda Miata alternate front hubs Mazda Motorsports Development Part #0000-04-5HUB-S1 approved. · SMX Spec MX-5 camera requirement: non-functioning recorder now will instead of may warrant penalty or disqualification. · SM and SMX must run latest AIM Data Logger Spec MX-5 ECU Protocol, effective 2024-09-01. · SMX Mazda MX-5 OE versus OEM definitions clarified in GCR section 9.1.7.1; wording change only. · SM and SMX now allow an alternate shifter bushing at the bottom of the shift lever. · SMX Spec MX-5 camera requirement: non-functioning recorder now will instead of may warrant penalty or disqualification. · SM and SMX must run latest AIM Data Logger Spec MX-5 ECU Protocol, effective 2024-09-01. · SMX Mazda MX-5 OE versus OEM definitions clarified in GCR section 9.1.7.1; wording change only. · SM and SMX now allow an alternate shifter bushing at the bottom of the shift lever.show
| |||||||||||||||
| 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%) | 1:38.964Michael Tinis · fastest of 33 · top 5 within 0.5s | 1:39.924Will Robusto · fastest of 33 · top 5 within 1.1s | 116.0Jack Murchison | +3.071squal +2.608s | 103.2%qual 102.7% | 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% | ||
5 rule changes (STL: 5)2 engine · 1 aero · 1 weight · 1 wording · STL and STU now permit electric power steering pumps, OEM electric-assisted steering, or column-mounted electric steering assist systems. · STL normally aspirated minimum weights reduced: 1900cc to 2540 lbs, 1950cc to 2583 lbs, 2000cc to 2625 lbs; short-wheelbase FWD adds 1.25%; Honda B16/B17/B18C1 throttle to 51mm, B18C Type R and Mazda MZR to 50mm. · STL Mazda 12A: 5th and 6th intake port actuators and valves may no longer be removed or disabled. · STL 79-85 RX7 12A now allows auto-type 2 bbl carburetor with 42mm choke on dual-y manifold, not just stock Nikki. · STL ITA and ITS RX7, and ITS/ITA/ITB/ITC 1985+ models clarified to require tires per 9.1.4.2.show
| |||||||||||||||
| 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% | |||||||
3 rule changes (STL: 1, SM: 2)1 cars added · 1 weight · 1 wording · SM Mazda MX-5 Miata 01-05 minimum weight rises to 2450 lbs, or 2465 with alternate bore. · Spec MX5 in STL allows ACT clutch 0000-02-5004-G6, wheels 17x8, Toyo RR and RA1 235-40-17 tyres, or alternatives on 17x7 per rules. · SM Majors must run authorized Penske shock and mount; Regional competitors not required until further evaluation.show
| |||||||||||||||
| 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%) | 1:42.814Connor 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% | |||||||
12 rule changes (STL: 11, SM: 1)3 engine · 1 cars added · 1 tyres & wheels · 1 weight · 5 wording · 1 other · STU single throttle body weight reduction removed; minimum weights revised down to 2990 lbs at 3000cc from 3300 lbs. · STL and STU Improved Touring vehicles must now conform to section 9.1.4 Tires & Wheels. · STL/STU intake manifold and cylinder head porting clarified as free; intake and exhaust porting wording removed. · STL Mazda Renesis flat plate restrictor increases from 55mm to 60mm. · STL 79-85 RX7 12A allows emissions removal and jet correction on stock Nikki carb. · STL Mazda Spec MX-5 removes redundant specification line referencing 2014 regulations. · STL Volkswagen 2.0L TFSI 1984 cc engine permitted without turbocharger, meeting all other STL specs. · STL Pontiac Solstice/Saturn Sky allowed 4 inch ride height. · STL Mazda B5 DOHC added to class; must meet all STL regulations. · STL Honda B16A (JDM) restrictor reduced from 54mm to 53mm. · SM adds procedure for CRB-approved obsolete parts and BOP testing in sanctioned events with point forfeiture. · ST oil coolers and filters now explicitly listed as addable or substitutable parts in vents and breathers section.show
| |||||||||||||||
| 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 | 1:41.798Danny 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% | |||||||
37 earlier rule changes on record, in force before Super Tour Mar 2021 (from 2019)8 cars added · 8 engine · 3 weight · 2 aero · 2 suspension & brakes · 1 induction · 8 wording · 5 other · STL GM Ecotec LNF now permits any Ecotec engine family with 55mm flat plate restrictor. · ST 90-05 Mazda Miata allowed alternate front wheel hub Mazda Motorsports Development Part #0000-04-5HUB-S1. · ST cars may now relocate ABS actuation hardware and wiring anywhere in the engine compartment. · STL rear wing trailing edge may be mounted no further rearward than the center of the rearmost part approved bodywork. · STL alternate transmissions now allow OEM gear sets and input shaft modifications for fitment. · STL RWD strut-front cars lose 2.5% weight penalty, others lose 3% penalty for FWD parity. · STL Honda F20C drops 2% weight penalty, minimum weight reduced. · STL Honda B16/B17/B18C1 restrictor reduced to 53mm, B18C variants and Mazda MZR to 52mm. · ST aero devices and reference areas must include end plates, exclude fasteners under 1/2" protrusion. · SM allows aftermarket radiators in original location with stock OEM cooling fan, and permits 1990-1997 cars to install upper radiator seal NA75-50-OK7A. · SM rear brake caliper may use single bracket under upper retaining bolt head to prevent pin failure. · STL and STU clarify weight adjustment calculation order: engine adjustments first, then chassis percentage additions, subtractions, and fixed pounds. · STL STU rear wing Gurney flap terminology clarified from wicker to Gurney flap in mounting and chord rules. · GT3 and STU add Borg-Warner EFR6258 turbocharger to approved turbo lists. · STL adds Mazda MX-5 Global Cup 16-18 at 2450 lbs minimum and 2019 at 2550 lbs minimum. · STL Mazda MX-5 Club 06-15 allowed header part number 0000-06-5407-NC. · STL Acura/Honda B18 and B18C engines: restrictor sizes swapped, B18C1 removed from allowed variants. · STL Honda B18 loses 53mm restrictor requirement; B18C1 added with 54mm restrictor, B18C1 removed from other variants. · STU GM Ecotech LNF now permitted without turbo, with LE5 head and intake manifold, meeting STL specs. · STL Mazda MZR restrictor reduced from 54 mm to 53 mm. · STL Mazda MZR restrictor reduces from 55 mm to 53 mm. · STL Mazda Spec MX5 Challenge adds approved wheel part numbers 0000-04-5706-GM, 0000-04-5706-SL to notes. · STL adds Mazda Spec MX-5 Challenge, 2000cc displacement, 2500 lb minimum weight, with mandatory Roush, Penske, Eibach, and other specified components. · STU allows alternate intake manifolds on case-by-case basis; stock throttle device and manifold otherwise required. · STL Acura/Honda B18 except C engine restrictor increased from 53mm to 54mm flat plate. · STL and STU ride height measurement clarified: lowest rocker panel point without driver, excluding pinch weld. · SM fuel pump and filter now permitted as Mazda or OEM equivalent part. · STL adds VW 1.8L R4 20VT 1781 cc, 1781 minimum weight, naturally aspirated only. · STL Mazda Renesis minimum weight reduced to 2700 lbs. · STL Mazda MX-5 Cup brake pad compound now open. · STL adds Acura/Honda B18C1 GSR with 1797cc displacement, 54mm flat plate restrictor required, porting outside 1" allowance prohibited. · STL Mazda 12 and 13B now permit port matching; porting ban removed. · SM allows factory Mazda ECU and injector harnesses (P/N 0000-10-020E-99, 0000-10-080D-99) on 1999–2000 model year cars, unmodified. · SM electrical rules reorganized and clarified; alternator now externally regulated only by OEM ECU or master kill switch; harness repair by splicing permitted. · SM tire tread protrusion language removed from GCR 9.1.7.C.5. · STL B17 now requires 54mm flat plate restrictor; B18C Type R variants move to 54mm restrictor, weight chart baseline. · STL Mazda Miata removes maximum displacement limit; minimum weight corrected to unspecified figure.show
| |||||||||||||||
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.