BoP Lab / Michelin Raceway Road Atlanta

GTX vs F5 pace at Michelin Raceway Road Atlanta

Quickest here: GTX 1:19.909 Raiden Nicol, Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta race · F5 1:30.019 Ryan Mayfield, Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta qualifying

Lap times% of GTX

GTXF5solid race · dashed qualifying · slower is lower

GTXF5solid race · dashed qualifying · each class's best lap as a share of GTX's at the same event (the reference class, changeable above); 100% is level, higher is quicker

	Event	GTX			F5
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs GTX	% of GTX
	Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta ST26MAR062026-03-06	1:27.748Garry Crook · only car+5.352s (+6.50%)	1:28.694Garry Crook · only car+8.785s (+10.99%)	151.5Garry Crook-1.8 mph (-1.2%)
6 rule changes (GTX: 6)3 cars added · 1 engine · 1 weight · 1 wording · GT3U class removed from GCR; GT3U cars now run in STU with 3.0" main frame and 2" front spoiler minimum ride height. · GTX Misc Table 4 adds RCR T70 Coupe with 2200 lbs minimum weight, no restrictor specified. · GTX Ligier LMP3 now allows any normally aspirated LS Chevrolet engine. · GTX Porsche GT2 RS Clubsport classified with factory specifications required at all race events. · TA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof requirement. · GT2-ST Acura NSX minimum weight raised to 3000 lbs, restrictor increased to 45mm TIR.showhide 2026-03-01 GTX Remove GT3U from GCR as it is now in STU #39862cars addedcars addedGT3U class removed from GCR; GT3U cars now run in STU with 3.0" main frame and 2" front spoiler minimum ride height. 2026-01-01 GTX Please Consider Adding a Spec Line to GTX Table 4 for the RCR T70 #39470cars addedcars addedGTX Misc Table 4 adds RCR T70 Coupe with 2200 lbs minimum weight, no restrictor specified. 2025-06-01 GTX Ligier P3 LS Swap #38164engineunclearGTX Ligier LMP3 now allows any normally aspirated LS Chevrolet engine. 2025-05-01 GTX Request to Classify Porsche GT2 RS Clubsport #37972cars addedcars addedGTX Porsche GT2 RS Clubsport classified with factory specifications required at all race events. 2025-01-01 GTX Correct language regarding OEM Areo Devices #37137wordingwordingTA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof requirement. 2024-05-01 GTX Request for Spec Line 1010 Reconsideration #35009weight +300 lbsslowerGT2-ST Acura NSX minimum weight raised to 3000 lbs, restrictor increased to 45mm TIR.
	Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta ST24MAR082024-03-08	1:22.396Raiden Nicol · fastest of 3 · top 3 within 60.3s-8.436s (-9.29%)	1:19.909Raiden Nicol · fastest of 3 · top 3 within 14.2s-11.557s (-12.64%)	153.4Raiden Nicol+3.6 mph (+2.4%)
8 rule changes (GTX: 8)4 cars added · 1 aero · 1 engine · 1 induction · 1 wording · GT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed. · GT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors. · GT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E. · GTX adds KTM X-Bow classification with restrictor and weight specifications effective 2024-01-01. · GTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL. · GTX Ligier LMP3 3.7L NA classified at 2203 lbs with 22 mm restrictor. · GTX Ligier JSP4 newly classified as GTX Misc with restrictor and weight specified. · Fields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight.showhide 2024-02-01 GTX Rear Blade Spoiler Clarification #35261aerofasterGT1, GT2, GT3, GTL, GTX rear spoiler maximum surface area limit of 295.0 square inches removed. 2024-02-01 GTX GT Direct Injection allowance and rules #35437enginefasterGT1/GT2/GT3/GTL/GTX Direct Injection now permitted if OE, using only OE pump, hoses, injectors. 2024-02-01 GTX GT2/3 remove Direction Injection not allowed in Spec line notes #35439inductionfasterGT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E. 2024-01-01 GTX KTM X Bow GTX #34956cars addedcars addedGTX adds KTM X-Bow classification with restrictor and weight specifications effective 2024-01-01. 2023-12-01 GTX Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453wordingwordingGTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL. 2023-07-01 GTX Request Ligier LMP3 Classification #34043cars addedcars addedGTX Ligier LMP3 3.7L NA classified at 2203 lbs with 22 mm restrictor. 2023-07-01 GTX Ligier JSP4 Request #34173cars addedcars addedGTX Ligier JSP4 newly classified as GTX Misc with restrictor and weight specified. 2023-05-01 GTX Please classify Fields Cardinal V8 #33784cars addedcars addedFields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight.
	Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta ST23MAR102023-03-10	1:30.832Steve Weber · only car+3.201s (+3.65%)	1:31.466Steve Weber · only car+6.051s (+7.08%)	149.8Steve Weber-23.2 mph (-13.4%)
10 rule changes (GTX: 6, F5: 4)4 cars added · 1 induction · 5 wording · GT2 TA2 and GTA throttle body part numbers updated to GM 90mm electronic #12570790 or Edelbrock 90mm mechanical #33869 or #3870. · F500 Rotax 493 and 593 intake boots: removed Moto Tassinari V3124-873B-2 option for non-HO, corrected BPP part numbers. · GT taillights may now be original style or a panel graphic with functioning red LED brake lamps; wording change only. · F500 Rotax engines now permitted to use Ingi Tech Sparker ignition DCP-CDI-P2 as alternate ECU. · F500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 stepped diameter exhaust headers prohibited. · F500 adds optional intake resonator removal for 593 engines with mandatory plugging; clarifies approved 38mm intake boots; permits stock oil injection pump removal. · Porsche 992 GT3 Cup Car newly classified in GTX. · GTX Wolf GB08 F1 Ford 52XS V8 added to classification at 1725 lbs minimum weight. · C7 Corvette Grand Sport classified in GTX Misc at 3200 lbs with option to remove displacement on demand valve train. · GTX eligible prototypes expanded: IMSA GTP years changed to 1981-1993, five prototype categories added.showhide 2022-12-01 GTX GT2 (TA2)/GTA Part Number Update #33315wordingwordingGT2 TA2 and GTA throttle body part numbers updated to GM 90mm electronic #12570790 or Edelbrock 90mm mechanical #33869 or #3870. 2022-09-01 F5 Intake Boots Correction #33028inductionslowerF500 Rotax 493 and 593 intake boots: removed Moto Tassinari V3124-873B-2 option for non-HO, corrected BPP part numbers. 2022-09-01 GTX Tail lights on all GT category race cars. #32799wordingwordingGT taillights may now be original style or a panel graphic with functioning red LED brake lamps; wording change only. 2022-08-01 F5 Ensure availability of ECU for Rotax engines #32695wordingwordingF500 Rotax engines now permitted to use Ingi Tech Sparker ignition DCP-CDI-P2 as alternate ECU. 2022-07-01 F5 Clarify stepped exhaust header references #32743wordingwordingF500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 stepped diameter exhaust headers prohibited. 2022-06-01 F5 593 carb boot availability and oil pump clarification #32527wordingwordingF500 adds optional intake resonator removal for 593 engines with mandatory plugging; clarifies approved 38mm intake boots; permits stock oil injection pump removal. 2022-06-01 GTX Classify 992 GT3 Cup #32649cars addedcars addedPorsche 992 GT3 Cup Car newly classified in GTX. 2022-05-01 GTX Add Classification to the accepted Model Table #31981cars addedcars addedGTX Wolf GB08 F1 Ford 52XS V8 added to classification at 1725 lbs minimum weight. 2022-05-01 GTX Request to classify C7 Corvette Grand Sport IN GTX Misc #32254cars addedcars addedC7 Corvette Grand Sport classified in GTX Misc at 3200 lbs with option to remove displacement on demand valve train. 2022-05-01 GTX E&O list of eligible prototypes #32511cars addedcars addedGTX eligible prototypes expanded: IMSA GTP years changed to 1981-1993, five prototype categories added.
	Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta ST22MAR122022-03-12	1:27.631Jacek Mucha · only car-2.818s (-3.12%)	1:25.415Jacek Mucha · only car-5.369s (-5.91%)	173.1Jacek Mucha+15.4 mph (+9.8%)	1:30.355Wiley McMahan · fastest of 11 · top 5 within 5.0s+0.336s (+0.37%)	1:31.333Wiley McMahan · fastest of 11 · top 5 within 5.4s+0.934s (+1.03%)	138.2Wiley McMahan-3.4 mph (-2.4%)	+5.918squal +2.724s	106.9%qual 103.1%
12 rule changes (GTX: 7, F5: 5)6 cars added · 1 induction · 4 wording · 1 other · F500 must install AIM part #X47KPFSOLO2R0 data box mount for Majors Races and Runoffs. · GTX McLaren 720s GT3 newly classified at 3000 lbs with 3000 mm restrictor. · GTX-FIA GT3 removes all intake restrictor requirements for fifteen car models; McLaren name corrected. · F5 cars must install AIM part #X47KPFSOLO2R0 data box mount for Majors Races and Runoffs. · GT3 Fun Cup Beetle EVO3 classified with 1984 cc sealed SOHC engine, 2060 lbs minimum weight. · GTX SRO-GT4 Porsche 718 Club Sport MR GT4 classified, unrestricted, 2900 lbs minimum weight. · F5 clarifies assisted shifting: mechanical only, no solenoids or air-shifters; throttle/ignition devices allowed if driver controls initiation. · F5 single-seat open-wheel cars: rigid suspension terminology changed to limited suspension. · GTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix. · Grullon GT with 2.0L K20 moved from GTX to GT2-ST, minimum weight 2350 lbs, unrestricted. · GTX Grullon GT added, unrestricted, 2350 lbs, factory spec required. · F500 Rotax 593 HO engine added at 875 lbs with MA0242SP1020A or MA0242SP1063A restrictor.showhide 2022-03-01 F5 E&O class name #32194wordingwordingF500 must install AIM part #X47KPFSOLO2R0 data box mount for Majors Races and Runoffs. 2022-03-01 GTX McLaren 720s GT3 #31955cars addedcars addedGTX McLaren 720s GT3 newly classified at 3000 lbs with 3000 mm restrictor. 2022-02-01 GTX Remove restrictions from GTX-FIA GT3 #32039inductionfasterGTX-FIA GT3 removes all intake restrictor requirements for fifteen car models; McLaren name corrected. 2022-01-01 F5 Data Box Mounting Plate #31638otherotherF5 cars must install AIM part #X47KPFSOLO2R0 data box mount for Majors Races and Runoffs. 2021-10-01 GTX Request car classification #31032cars addedcars addedGT3 Fun Cup Beetle EVO3 classified with 1984 cc sealed SOHC engine, 2060 lbs minimum weight. 2021-09-01 GTX Request to classify 2020 Porsche 718 GT4 Clubsport MR #30956cars addedcars addedGTX SRO-GT4 Porsche 718 Club Sport MR GT4 classified, unrestricted, 2900 lbs minimum weight. 2021-08-01 F5 Clarify allowable assisted shifting systems #30871wordingwordingF5 clarifies assisted shifting: mechanical only, no solenoids or air-shifters; throttle/ignition devices allowed if driver controls initiation. 2021-08-01 F5 Request to correct terminology #30976wordingwordingF5 single-seat open-wheel cars: rigid suspension terminology changed to limited suspension. 2021-08-01 GTX Request to Update GTA Obsolete Part Numbers #30615wordingwordingGTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix. 2021-08-01 GTX GTX class correction to GT2/ST #30973cars addedcars addedGrullon GT with 2.0L K20 moved from GTX to GT2-ST, minimum weight 2350 lbs, unrestricted. 2021-07-01 GTX Request classification of Grullon #30481cars addedcars addedGTX Grullon GT added, unrestricted, 2350 lbs, factory spec required. 2021-06-01 F5 Request to Allow Rotax 593 HO Engine #30712cars addedcars addedF500 Rotax 593 HO engine added at 875 lbs with MA0242SP1020A or MA0242SP1063A restrictor.
	Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta ST21MAR192021-03-19	1:30.449Ben Johnston · only car	1:30.784Ben Johnston · only car	157.6Ben Johnston	1:30.019Ryan Mayfield · fastest of 11 · top 5 within 7.0s	1:30.399Calvin Stewart · fastest of 11 · top 5 within 5.2s	141.6Ryan Mayfield	-0.385squal -0.430s	99.6%qual 99.5%
22 earlier rule changes on record, in force before Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta (from 2019)7 cars added · 2 induction · 1 engine · 1 weight · 10 wording · 1 other · F500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019. · GT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line. · GTX Chevrolet Camaro ZL1 LT4 with factory supercharger classified at 3400 lbs minimum weight. · GTX adds KTM X-Bow GT4, turbocharged 2.5L Audi TFSI I5, 2000 lbs minimum weight. · F5 request to adjust external jetting devices cockpit control denied by Club Racing Board. · Unable to summarize: letter references response in separate Fastrack document not provided. · TA2 Gurney flap wording clarified: terminology standardized to 'Gurney flap', height limits and thickness specifications remain 0.50 inch / 0.625 inch or 0.375 inch / 0.0625 inch depending on configuration. · STO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules. · GT classes clarify Gurney flap wording, replacing wickerbill/tab terminology with flap; specifications unchanged. · GTX tube frame cars must weigh 2780 pounds; stock car bodies now permitted. · GTX adds Lotus Evora GTS with 3.5L 2GR-FE engine, no restrictor, 2950 lbs minimum weight. · GT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications. · F500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced from 29mm to 28mm Flat Plate Intake. · Factory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs. · F500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 (03-13) minimum weight increases from 875 to 900 lbs. · GTX tube frame cars gain fuel injection with 90mm maximum throttle body size. · Ligier JS2 R classified in GTX, no performance parameters specified in filing. · GT1 and GT2/GT3/LITE ride height requirements removed from GCR sections 9.1.2.D.5.a.1 and 9.1.2.F.7.b. · GTX replaces all FIA GT4 references with SRO GT4. · GTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified.showhide 2020-10-01 F5 Request to Update Suzuki Engine Years for F500 #29453wordingwordingF500 Suzuki GSXR600 engine years extended from 2003-2013 to 2003-2019. 2020-09-01 GTX GT Category Wording #29193wordingunclearGT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line. 2020-08-01 GTX Request Car classification #28935cars addedcars addedGTX Chevrolet Camaro ZL1 LT4 with factory supercharger classified at 3400 lbs minimum weight. 2020-08-01 GTX X-Bow GT4 #29088cars addedcars addedGTX adds KTM X-Bow GT4, turbocharged 2.5L Audi TFSI I5, 2000 lbs minimum weight. 2020-07-01 F5 Request for Cockpit Adjustment of External Jetting Devices #28359wordingwordingF5 request to adjust external jetting devices cockpit control denied by Club Racing Board. 2020-07-01 F5 Two Stroke Motors (reply to #28359 WDYT) #28816engine 2020-07-01 F5 Re letter requesting driver adjustable carb mixture #28840other 2020-07-01 F5 #28359 WDYT Request for Cockpit Adjustment #28875wordingunclearUnable to summarize: letter references response in separate Fastrack document not provided. 2020-07-01 GTX TA2 Gurney flap wicker clarification #28874wordingwordingTA2 Gurney flap wording clarified: terminology standardized to 'Gurney flap', height limits and thickness specifications remain 0.50 inch / 0.625 inch or 0.375 inch / 0.0625 inch depending on configuration. 2020-07-01 GTX STO Gurney flap wicker clarification #28883wordingwordingSTO rear wing wording clarified: 'wicker' changed to 'Gurney flap' in maximum chord and mounting height rules. 2020-07-01 GTX GT Gurney flap wicker clarification #28909wordingwordingGT classes clarify Gurney flap wording, replacing wickerbill/tab terminology with flap; specifications unchanged. 2020-06-01 GTX Request to Re-classify SP Stock car to GTX #28333cars addedcars addedGTX tube frame cars must weigh 2780 pounds; stock car bodies now permitted. 2020-05-01 GTX Request to Classify Lotus Evora GTS #27057cars addedcars addedGTX adds Lotus Evora GTS with 3.5L 2GR-FE engine, no restrictor, 2950 lbs minimum weight. 2020-02-01 GTX Windshield Clips #27323wordingwordingGT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications. 2020-01-01 F5 Change 600cc restrictor size #27883inductionslowerF500 Honda CBR600RR, Suzuki GSXR600, Yamaha R6 restrictor reduced from 29mm to 28mm Flat Plate Intake. 2020-01-01 GTX Request Factory Five Daytona coupe classification #26308cars addedcars addedFactory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs. 2019-08-31 F5 Request for Weight Increase for Motorcycle Powered Cars #27214weight +25 lbsslowerF500 Honda CBR600RR, Suzuki GSXR600, and Yamaha R6 (03-13) minimum weight increases from 875 to 900 lbs. 2019-05-01 GTX Request GTX Fuel injection for previous GT-1 tube frame cars #26141inductionfasterGTX tube frame cars gain fuel injection with 90mm maximum throttle body size. 2019-05-01 GTX Request to Classify Ligier JS2 R #26535cars addedcars addedLigier JS2 R classified in GTX, no performance parameters specified in filing. 2019-04-01 GTX Request Ride Height Clarification #26600wordingwordingGT1 and GT2/GT3/LITE ride height requirements removed from GCR sections 9.1.2.D.5.a.1 and 9.1.2.F.7.b. 2019-03-01 GTX Replace FIA references with SRO #26427wordingwordingGTX replaces all FIA GT4 references with SRO GT4. 2019-01-01 GTX GTX Homologation table update #26034cars addedcars addedGTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified.

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