BoP Lab / Michelin Raceway Road Atlanta
FC vs GT3 vs SM pace at Michelin Raceway Road Atlanta
Quickest here: FC 1:23.672 Brandon Dixon, Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta race · GT3 1:37.849 Michael Lewis, Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta qualifying · SM 1:42.324 Skyler Cottrell, Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta qualifying
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| Qual best | Race best | Trap | Qual best | Race best | Trap | vs FC | % of FC | Qual best | Race best | Trap | vs FC | % of FC | |||
| Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta ST26MAR062026-03-06 | 1:23.854Brandon Dixon · fastest of 3 · top 3 within 8.1s-5.116s (-5.75%) | 1:23.672Brandon Dixon · fastest of 3 · top 3 within 9.3s-6.776s (-7.49%) | 138.7Brandon Dixon+12.1 mph (+9.6%) | 1:42.324Skyler Cottrell · fastest of 52 · top 5 within 0.4s-0.524s (-0.51%) | 1:42.611Charles Mactutus · fastest of 51 · top 5 within 0.2s-0.014s (-0.01%) | 112.2James Newell+5.2 mph (+4.9%) | +18.939squal +18.470s | 122.6%qual 122.0% | |||||||
9 rule changes (FC: 2, GT3: 4, SM: 3)3 weight · 1 cars added · 1 suspension & brakes · 4 wording · GT3U class removed from GCR; GT3U cars now run in STU with 3.0" main frame and 2" front spoiler minimum ride height. · FC USF2000 Tube Frame may use Hewland LD200 4-speed H-pattern as alternative to Hewland JL-200 5-speed sequential. · FC F2000 Metrik ZF2 minimum weight reduced to 1220 lbs. · GT3U cars must maintain 3.0" minimum ride height on frame rails and 2" minimum on front spoiler and splitter. · GT3U cars with 15×7" wheels add 225 lbs to GT3 weight; wider wheels allowed with weight penalties up to 3.0%. · 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 fine; level 2 and 4 may carry $500 fine. · GT3U with 15x7 wheels and 225 tires gains 75 lbs to 225 lbs over GT3 weight; wheel weight penalties clarified. · SM cars limited to one set of Hoosier SM 7.5 P205/50/ZR17 per Super Tour event weekend for dry sessions.show
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| Atlanta Region SCCA Hoosier Super Tour @ Michelin Raceway Road Atlanta ST25MAR072025-03-07 | 1:28.970Eric Presbrey · fastest of 2+3.675s (+4.31%) | 1:30.448Carter Sheets · fastest of 2+4.896s (+5.72%) | 126.6Carter Sheets-3.0 mph (-2.3%) | 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%) | +12.177squal +13.878s | 113.5%qual 115.6% | |||||||
29 rule changes (FC: 3, GT3: 21, SM: 5)11 weight · 5 cars added · 1 aero · 1 engine · 1 induction · 1 tyres & wheels · 9 wording · TA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof requirement. · GT3 VW Fun Cup Beetle Sealed exempt from 150 lbs consolidation add-on weight. · GT3 Pontiac LE5 Ecotech minimum weight drops 150 lbs to 2195. · SMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted. · FC tire limit reduced to four dry and four wet for Regional/Major/Super Tour, eight for Runoffs. · FF and FC cars with sequential gearbox must add 10 lbs. to minimum weight, down from 25 lbs. · GT3 Mazda 13B Bridgeport and Peripheral Port both drop to 2275 lbs minimum weight. · GT3 Nissan MR20DE DOHC engine classified with 1997cc displacement, 32mm restrictor, 2060 lbs minimum weight. · GT3 Mazda 13B minimum weight drops 175 lbs to 2175 lbs. · GT3 Mazda 12A peripheral port minimum weight reduced to 2100 lbs. · GT3 Mazda 3TC classified in TCR with 2950 lbs minimum weight, effective 11/1/2024. · SMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification. · SMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance. · SMX Mazda Miata OE versus OEM definitions clarified in GCR Section 9.1.7.1. · SM and SMX shifter bushing rules clarified: alternate bushing at shift lever bottom now allowed. · GT3 adds Datsun 1200 B110 (70–73), 90.6 in wheelbase, engine per GT3 spec or alternate Nissan request. · GT3-TCR Honda Civic Type R, Audi RS3 LMS, Hyundai I30N, Volkswagen GTI weights adjusted; Hyundai down 100 lbs to 3154, VW down 100 lbs to 3077. · GT3 Pontiac Sunfire GT weight reduction corrected from 150 lbs to 75 lbs. · GT3 Mazda MZR removes second DOHC option, fuel induction now unrestricted. · GT3 cars may run +1mm SIR above spec with 175 lb weight penalty added. · GT3 turbocharged 1401-1850cc four-valve engine with 35mm restrictor reduced to 34mm, weight to 2250 lbs. · GT2-ST Acura NSX minimum weight raised to 3000 lbs, restrictor increased to 45mm TIR. · GT3 Ford Duratech now allows hood bulge with no openings. · GT3 Acura K20A RSX body disenfranchised from GT2 adds 75 lbs weight penalty. · GT3 Toyota 4Y engine classified at 2030 lbs with unrestricted fuel induction. · GT3 Toyota model designation changes from DR86 to GR86. · GT3 Honda spec lines change engine family designation from bore/displacement to K20C1 and K24 model numbers. · GT3 Mazda spec line numbering changed from 4 to Model, unrestricted to 323, and 2195 to 626. · FC adds F2000 Metrik ZF2 with Ford Zetec engine and four-piston Brembo calipers as spec-line car.show
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| Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta ST24MAR082024-03-08 | 1:25.295Brandon Dixon · fastest of 7 · top 5 within 4.5s | 1:25.552Tim Minor · fastest of 6 · top 5 within 4.9s | 129.6Tim Minor | 1:37.849Michael Lewis · fastest of 2 | 1:41.131Michael Lewis · fastest of 2 | 122.4Andrew Lott | +15.579squal +12.554s | 118.2%qual 114.7% | 1:42.620Danny Steyn · fastest of 47 · top 5 within 0.4s | 1:42.995Charles Mactutus · fastest of 46 · top 5 within 0.1s | 105.2Tyler Brown | +17.443squal +17.325s | 120.4%qual 120.3% | ||
99 earlier rule changes on record, in force before Atlanta Region Hoosier SCCA Super Tour @ Michelin Raceway Road Atlanta (from 2019)26 cars added · 14 induction · 10 weight · 9 engine · 3 tyres & wheels · 2 aero · 1 removed · 1 suspension & brakes · 33 wording · GT3 Miata Turbo restrictor increases to 35 mm, minimum weight rises to 2350 lbs. · 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. · GT3 Toyota FA24D engine classified: 2387cc DOHC, 2195 lbs, 32mm SIR, direct injection permitted. · GT2/3 Nissan, Mazda, Mitsubishi 4G93, QR25DE/DD, QE25DE/DD Direct Injection now permitted per 9.1.2.F.7.5.E. · GT3 Nissan QR25DE/DD spec line edit; text unreadable due to formatting corruption. · F600 Rotax 494, 493, 593 engines now require single expansion chamber and pull starter; electric starter optional. · GT3 Mazda RX7 12A, 13B Bridgeport, 13B Peripheral Port: disenfranchised GT2 adds 75 lbs. · GT3 Mazda BP4W turbocharged OEM engine weight reduced from 2060 to 1960 lbs. · GT3 Mazda 13B peripheral port weight reduced to 2100 lbs. · GT3 adds Toyota GR 86 (DR86) 2021–2024, 2-door RWD, 101.3 in wheelbase. · GT3 Toyota 3S bore increases to 86.0mm, stroke decreases to 86.0mm. · GT3 Toyota 3S DOHC engine classified at 1998 cc, 1960 lbs minimum weight, unrestricted fuel induction. · GT3 2.0L SIR cars lose 32mm unrestricted option, now require restrictor at 2195lbs minimum. · GTL spec lines moved to contiguous position with GT2 and GT3; GTA category and spec lines renumbered and moved behind GTL. · GT3-TCR Audi RS3 LMS, Honda Civic Type R, Hyundai i30 N, VW Golf GTi must use 200 tread wear tires only. · GT3 Honda B20 engine newly classified for use in CRX, 1973cc displacement, aluminum head, DOHC. · GT3 cars using 15" American Racer 23.5-10.0-15 bias ply tires avoid weight penalty. · FC tire marking rule clarified: four dry and wet tires for Regionals, eight each for Runoffs; damaged tire replacement procedures revised. · USF2000 Van Diemen with Mazda MZR LF-DE 2.0L added as spec line car in FC; removed from FX. · Fields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight. · FC/FF PE3-8400 ECU monitor firmware version reduced from V3.04.50 to V3.04.35. · GT3 Nissan VG30 engine removed from class entirely. · GT3 normally aspirated cars may use intake chokes instead of SIRs, fitted to each carburetor barrel, same size as required SIR. · GT3 2.0L 4-valve non-turbo engines may run unrestricted at 2060 lbs instead of with a choke restriction. · SM Mazda MX-5 Miata 01-05 weight increases to 2450 lbs, or 2465 with alternate bore. · GT3 Mazda BP4W Turbocharged OEM engine added at 2060 lbs with 34mm TIR and IHI RHF5 VJ35 turbocharger. · GT2 TA2 and GTA throttle body part numbers updated to GM 90mm electronic #12570790 or Edelbrock 90mm mechanical #33869 or #3870. · GT3 Nissan SR20VET turbo changes to GT2860RS and allows open ECU instead of OEM stock. · GT3 adds 84-87 Civic 3dr FWD, hood bulge allowed, no openings. · GT3 Turbo maximum displacement increases from 1800 cc to 1850 cc. · GT taillights may now be original style or a panel graphic with functioning red LED brake lamps; wording change only. · GT3 Nissan SR20VET Limited Prep-Turbocharged OEM engine classified, 1998cc DOHC with Garrett GT2560LS turbo, 2060 lbs. · FC Ford Zetec Performance Electronics ECU model renamed PE-3 to PE3-8400; Monitor firmware updated to V3.04.50. · GT3 Fiat 124 Spider model name corrected from Pininfarina to Pininfarina Spider. · GT3 Fiat 124 Spider Pininfarina reclassified by model year, body style, drivetrain, and wheelbase. · GT3 cars can use up to 18" wheels with 12.0" tire cross section and 26.0" diameter at 5% weight penalty, down from 8%. · GT3-TCR: Audi RS3 LMS SEQ power to 90%, weight to 3177 lbs; RS3 LMS DSG power to 90%; Honda Civic Type R power to 90%, weight to 3210 lbs; Hyundai i30N power to 90%, weight to 3254 lbs; VW Golf GTI SEQ power to 90%, weight to 3177 lbs; Gol… · SM Majors must run authorized Penske shock and mount; Regional competitors' requirement eligibility clarified. · GT3 Ginetta G40 classified with Mazda MZR 1999cc at 2060 lbs or Ford Duratec 2260cc at 2195 lbs. · GT3 Mazda MZR DOHC 1999cc classified with 2195 lbs minimum weight, unrestricted fuel induction. · Volvo S60 2000-2009 classified in GT3. · GT3 2.0L 4V engines now unrestricted at 2195 lbs minimum weight across all makes. · GT3 wing wording corrected: single element airfoil scaled changed to up to maximum chord 10.75 inches. · GT3 adds Fiat Spider 2000, Years 79-81, RWD, 89.76" wheelbase. · GT3 adds Fiat X-19, years 72-89. · FC chassis/frame section reorganized: anti-intrusion panels between main tubes clarified, suspension mounting restrictions strengthened, firewall requirements reworded. · FC Zetec ECU requirements clarified: Pectel T2 or Performance PE-3 required with specific communications ports and SCCA tune-file/map. · GT3 Fun Cup Beetle Sealed weight reduced 210 lbs, to 1850. · GT3-TCR class added: Audi RS3 LMS, Honda Civic Type R, Hyundai i30N, VW Golf GTI at 3100–3200 lbs with 200 tread wear tires. · FC composite anti-intrusion panels of non-uniform thickness limited to eight fasteners per side. · FC tire marking rules clarified: competitor responsible for declaring, marking, and logging tires with Tech before qualifying or race. · GT3 Ford Cortina GT 1964-1968 newly classified for competition. · GT3 Fun Cup Beetle EVO3 classified with 1984 cc sealed SOHC engine, 2060 lbs minimum weight. · GTA part numbers updated: 0-80541-1 to 0-80541-2 in two sections and 6010 to 6014X in TA2 Appendix. · GT3 now permits current FP spec line cars to compete while maintaining their full FP rule set. · GT3 Mazda MZR 2.0L fuel induction restrictor increases from 31 to 32 mm. · GT3 Mazda Renesis and 13B Bridgeport choke reduced from 44mm to 42mm. · SM adds procedures for testing obsolete part replacements and BOP updates in sanctioned events with CRB approval. · FC Pinto engine loses 10 lbs to 1190; Pinto aluminum head loses 10 lbs to 1190; Zetec loses 10 lbs to 1210. · GT3 Mazda MZR and MZR/L5-VE fuel induction sizing changes from 31 to 32. · GT3 Honda Prelude 1992-1997 classified, 2dr FWD, 104 inch wheelbase. · FC: Pectel T2 and Performance PE-3 ECU maps clarified; SCCA Club or 2013 Pro map required. · SM aftermarket radiators must mount in original location, maintain core plane, require no body modifications, block openings, keep one OEM fan in stock location; 1990-1997 cars may install upper radiator seal NA75-50-OK7A. · GT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line. · FC Zetec engine minimum weight increases 20 lbs to 1220 lbs. · SM rear brake calipers may use single bracket under upper retaining bolt to prevent pin failure. · GT3 Mazda 12A Peripheral Port added to rule set, 2300 cc, 2292 lbs. · 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. · GT3 4v SIR 4-cylinder engines across multiple brands increase fuel induction from 31 to 32. · GT3 and STU add Borg-Warner EFR6258 to approved turbocharger list. · GT3 Nissan KA24E loses permission to use 32mm chokes at 2280 lbs for 2011-2012 only. · GT3 Mazda MZR L5-VE gets 31mm SIR restrictor, weight up from 1950 to 2195 lbs, direct injection banned. · GT1, GT2, GT3, GTL, GTX may omit windshield clips if factory glass is bonded per original specifications. · Factory Five Type 65 Coupe R with Ford 302/351 or 5.0/5.2L NA added to GTX-MISC at 2600 lbs. · GT3 Mazda 13B Bridgeport restrictor reduced from 44mm to 42mm. · GT3 Alfa Romeo 4C classified with 1742cc engine, 33mm TIR restrictor, 2325 lbs minimum weight. · GT3 Mazda MZR/L5-VE gets unrestricted induction, drops 245 lbs to 1950, limited to GT2 prep. · GT3 Honda K20C1 turbocharged engine added with 33 mm TIR restrictor, 2350 lbs minimum weight. · GT3 wing end plates change from 11.00 by 4.00 inches rectangle to maximum 64 square inches. · FC Zetec connecting rods now allow Eagle #CRS5483F3D in addition to original Ford. · FC adds Mahle #930169439 piston as alternate option to existing Ford, Sealed Power, and United Engine choices. · GT3 Nissan adds SR16VE engine, 1596cc, 1690 lbs, unrestricted induction. · GT3 Mazda 12A Bridgeport gains optional 42mm choke at 2010 lbs minimum weight. · FC Wiseco piston and Crower connecting rod part numbers updated; minimum weight 976 grams. · 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. · GT3 Mazda 13B and Renesis engines reclassified with new weight specs ranging 2080–2350 lbs. · 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. · GT3 13B and Renesis rotaries gain 200 lbs minimum weight; 13B Peripheral Port to 2400, Bridge Port to 2400, Renesis Peripheral Port to 2450, Bridge Port to 2450. · GT3 adds Mitsubishi 4G69 SOHC 2378cc engine, 2195 lbs minimum weight, 31mm SIR. · SM fuel pump and filter must be Mazda or OEM Equivalent part. · SM 1999-2000 model year cars may use replacement Mazda ECU and injector harnesses, unmodified. · SM electrical rules reorganized and clarified; alternator external regulation now prohibited except via OEM ECU/kill switch. · SM removes tire tread protrusion beyond fender opening requirement from GCR 9.1.7.C.5. · FC Wiseco piston and Crower connecting rod assembly minimum weight increases from 555 to 976 grams. · GTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified.show
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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 FC" is the class's best as a share of FC'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 FC'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.