BoP Lab / Classes / GTL
GTL vs SM vs FF vs P2 pace at every track
Lap times across years say as much about the weather as the class. % of GTL is each class's best lap as a share of GTL'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: GTL 1:35.377 Wilson Wright, Runoffs 2016 qualifying · SM 1:40.514 Justin Hille, Runoffs 2016 qualifying · FF 1:29.213 Neil Verhagen, Runoffs 2016 qualifying · P2 1:20.188 Jeff Shafer, Runoffs 2016 qualifying
| Event | GTL | SM | FF | P2 | ||||||||||||||||
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| Qual best | Race best | Trap | Qual best | Race best | Trap | vs GTL | % of GTL | Qual best | Race best | Trap | vs GTL | % of GTL | Qual best | Race best | Trap | vs GTL | % of GTL | |||
| Road America Runoffs 20262026-09-28 | 2:42.173Brett Kowalski · fastest of 34 · top 5 within 0.3s-0.938s (-0.58%) | 2:42.725Francisco Barroso · fastest of 35 · top 5 within 0.2s-1.705s (-1.04%) | 119.6Wyatt Couch+0.3 mph (+0.3%) | 2:23.047David Ybarra · fastest of 20 · top 5 within 1.4s-1.858s (-1.28%) | 2:23.686Nathan Down · fastest of 20 · top 5 within 1.6s-1.855s (-1.27%) | 138.9Tazio Stefanelli+0.5 mph (+0.3%) | 2:10.606Greg Gyann · fastest of 11 · top 5 within 5.3s+3.201s (+2.51%) | 2:09.441Mike Reupert · fastest of 11 · top 5 within 4.2s+1.119s (+0.87%) | 155.0Matt Strand+2.4 mph (+1.6%) | |||||||||||
5 rule changes (GTL: 1, SM: 2, FF: 2)1 cars added · 1 tyres & wheels · 2 wording · 1 other · FF Kent 1600 compression ratio calculation parameters reorganized: bore size and valve protrusion limits moved to separate subsections for clarity. · SM/SMX Mazda rear toe link part number revised from 0000-04-5361426 to 0000-04-5361. · SM/SMX part number 0000-10-6900 replaced with 0000-06-5016-KT in GCR 9.1.7.C.1.j.1.c. · GT3U class removed from GCR; GT3U cars now compete in STU. · FF clarifies alternative tire eligibility: homologated 1989 or earlier with rocker or outboard suspension all four corners; push-rod/pull-rod cars may seek approval.show
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| Road America Runoffs 20252025-09-29 | 2:43.111Bobby Gossett · fastest of 32 · top 5 within 0.3s+2.005s (+1.24%) | 2:44.430Kyle Greenhill · fastest of 28 · top 5 within 0.3s+2.944s (+1.82%) | 119.3Francisco Barroso-0.6 mph (-0.5%) | 2:24.905Jonathan Kotyk · fastest of 17 · top 5 within 1.1s+2.353s (+1.65%) | 2:25.541Calvin Kautz · fastest of 16 · top 5 within 0.5s+3.484s (+2.45%) | 138.4Tazio Stefanelli-2.3 mph (-1.6%) | ||||||||||||||
12 rule changes (GTL: 3, SM: 4, FF: 4, P2: 1)3 engine · 2 tyres & wheels · 2 weight · 4 wording · 1 other · 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. · FF adds rocker arm and outboard suspension cars option to use Hoosier bias ply slicks or VFF tyres; clarifies mixing rules. · 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. · FF adds alternative tire options for older cars with rocker arm or outboard suspension: bias ply slicks or VFF radials. · TA2 rear wing height rule clarified: OEM aerodynamic devices exempt from peak-of-roof height limit. · P2 2000 cc Pinto engine car minimum weight set to 1335 lbs. · 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. · FF and FC sequential gearbox weight penalty reduces from 25 lbs to 10 lbs minimum weight addition. · FF Honda Fit pistons: OEM 0.25mm oversize PN 13020-RB7-Z00 or Fast Forward PN FF800-110 now both allowed; standard diameter 73.240mm (2.8835 inches), minimum weight 198.0g. · GTL Toyota G16E-GTS removes direct injection prohibition, allowing direct injection engines. · GTL L16 limited prep gains 32mm choke option at 1910 lbs, compression capped 12.0:1, valve lift .450 max.show
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| Road America Runoffs 20242024-10-01 | 2:30.858Peter Shadowen · fastest of 14 · top 5 within 4.4s-1.085s (-0.71%) | 2:30.844Chris Bovis · fastest of 13 · top 5 within 3.7s-0.757s (-0.50%) | 133.3Peter Shadowen+1.8 mph (+1.4%) | 2:41.106Ethan Goulart · fastest of 49 · top 5 within 0.5s-1.103s (-0.68%) | 2:41.486Brett Kowalski · fastest of 43 · top 5 within 0.3s-2.262s (-1.38%) | 119.9Alex Bertagnoli-1.4 mph (-1.2%) | +10.642squal +10.248s | 107.1%qual 106.8% | 2:22.552Calvin Kautz · fastest of 13 · top 5 within 1.1s-0.364s (-0.25%) | 2:22.057Sebastian Mateo Naranjo · fastest of 13 · top 5 within 0.6s-2.211s (-1.53%) | 140.7Calvin Kautz+2.6 mph (+1.9%) | -8.787squal -8.306s | 94.2%qual 94.5% | 2:07.405Bart Wolf · fastest of 14 · top 5 within 3.0s-1.109s (-0.86%) | 2:08.322Bart Wolf · fastest of 13 · top 5 within 0.6s-1.471s (-1.13%) | 152.5Lucian Pancea-0.6 mph (-0.4%) | -22.522squal -23.453s | 85.1%qual 84.5% | ||
27 rule changes (GTL: 16, SM: 4, FF: 2, P2: 5)6 engine · 5 cars added · 3 weight · 1 aero · 1 induction · 9 wording · 2 other · FF EGR blanking plate rule clarified: VTEC activation valve must be retained and functioning, no modifications permitted. · GTL adds Toyota GR86 2021–2023, 2dr RWD, 101.3 in wheelbase. · GTL adds Spec Miata 1990–2005 with legal Spec Miata engine and intake system. · GTL adds Mazda MX5 RF 2017- model with 91.0 in wheelbase. · 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. · GTL added to GT3 choke option line in GCR 9.1.2.E.13.n. · GT2-ST Acura NSX minimum weight rises to 3000 lbs, restrictor increases to 45mm TIR. · GTL Datsun 510 Limited Prep fuel induction increased to 34 mm chokes, minimum weight rises to 2000 lbs. · P2 Spec Line E engine notes clarify oil system, ECU, and exhaust remain unrestricted; wording only. · P2 FIA Group CN notes clarify V de V European Proto Endurance Challenge bodywork, rear diffuser, wing, wheels, assisted shifting allowed; regulations link provided. · GT1-GTX rear blade spoiler: angle 50–75°, max 59.0 wide by 5.0 high inches; total area limit removed. · GT1, GT2, GT3, GTL, GTX Direct Injection now permitted if original equipment. · GT2 Nissan and GT3 Mazda, Mitsubishi 4G93, Nissan QR25DE/DD, QE25DE/DD now permit Direct Injection per 9.1.2.F.7.5.E. · FF Honda Fit gains Fast Forward oversize piston ring option PN FF800-100 as alternative to Riken or Nippon. · GTL 12A rotary engines may machine and use 13B housing to O.E. 12A spec across all port types. · GTL Toyota DR86 2021–2024 added to class. · GTL BMW Mini model years changed to 2002-2013. · P2 AMAC and related cars: clarified B.1 modified engine range to 2008 and older stock engines only, with 38mm restrictor and 1025 lbs minimum weight. · P2 Suzuki GSX-R1000 engine: 2007–2008 crankcase 11300-21860 may be replaced with 2016–2019 GSX-S1000 part 11301-04840. · GTL small unrestricted engines under 1399cc lose 38–79 lbs across Alfa, AMC, Triumph, Mini, Sprite, Fiat, Ford, Honda, Mazda, Nissan, Subaru, Toyota, Volkswagen. · GTL Honda Fit 2009-13 2-door FWD added with 99.0 in wheelbase, alternate 94.0 and 97.0 in. · GTL spec lines moved contiguous with GT2 and GT3; GTA category and specs renumbered behind GTL; P2 engine tables reorganised with restrictor and weight specifications clarified. · P2 Table 1 engine date ranges clarified: Stock Engine replaced with specific marques Suzuki, Yamaha, Honda, BMW for 2009-newer and 2008-older rows. · GTL Nissan Sentra/200SX A 1400 minimum weight reduced to 1800 lbs.show
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| Virginia International Raceway Runoffs 20232023-09-23 | 2:09.564Peter Shadowen · fastest of 11 · top 5 within 4.9s+1.775s (+1.39%) | 2:11.277Graham Fuller · fastest of 10 · top 5 within 2.4s-9.903s (-7.01%) | 142.7Peter Shadowen+6.7 mph (+4.9%) | 2:14.986Danny Steyn · fastest of 52 · top 5 within 0.1s+0.322s (+0.24%) | 2:16.229Julian DaCosta · fastest of 46 · top 5 within 0.3s-2.878s (-2.07%) | 120.3Jim Drago+1.1 mph (+0.9%) | +4.952squal +5.422s | 103.8%qual 104.2% | 1:59.249Nolan Allaer · fastest of 8 · top 5 within 2.8s+0.034s (+0.03%) | 2:00.583Jonathan Kotyk · fastest of 8 · top 5 within 0.4s-17.775s (-12.85%) | 138.4Calvin Kautz+0.1 mph (+0.1%) | -10.694squal -10.315s | 91.9%qual 92.0% | 1:48.590Greg Gyann · fastest of 12 · top 5 within 1.7s+1.024s (+0.95%) | 1:48.829Lucian Pancea · fastest of 11 · top 5 within 0.9s-27.005s (-19.88%) | 150.9Lucian Pancea-0.2 mph (-0.2%) | -22.448squal -20.974s | 82.9%qual 83.8% | ||
17 rule changes (GTL: 7, SM: 1, FF: 1, P2: 8)5 cars added · 4 engine · 2 weight · 6 wording · Fields Cardinal V8 added to GT1 with Ford V8 engine, 4.9L, 2100 lbs, fuel injection. · P2 minimum side body height must equal front axle centerline height, viewed from side. · P2 closed cockpit single seat cars now prohibited unless Table 1 spec line permits. · P2 engine table spec line B.1 redundant effective date language removed and table updated. · P2 motorcycle restrictor reduced 35mm to 34mm for 2011+ Kawasaki; minimum weights increased to 1100 lbs for 2009+ engines; cockpit length corrected to 23.622 inches. · FF Honda Fit engine adds Fast Forward part number alternatives for intake, exhaust, oil system, and scavenge pump components. · GTL 3K, 4K, 5K Toyota engines may now use 4Y block only. · GT2 and GTL add Toyota 4A-F and 4A-FE 1.6L DOHC 16V engines as permitted options. · Sebeco NP01-EVO and Elan NP01 added to P2 with Mazda 2.0L MZR, no restrictor required, 1600 lb minimum weight. · P2 Radical SR3/SR4, Cup, Club Sport, Pro-Sport, PR6: assisted shifting clarified from A-assisted to Aassisted; Cup engine restrictor changed from Unrestricted to Not required. · P2 chassis now allows composite materials partially installed; anti-intrusion panels attachment simplified; Stohr and converted models clarified. · SM Mazda MX-5 Miata 01-05 minimum weight rises to 2450 lbs, or 2465 with alternate bore. · GTL Fiat X1/9 1500 Limited Prep minimum weight increases to 2000 lbs from 1835 lbs. · GT2 TA2 and GTA throttle body part numbers updated to GM 12570790 or Edelbrock 33869/3870. · GTL adds Ford Festiva 1988-1993 FWD hatchback with Mazda B3 1324cc engine. · GTL adds Toyota G16E-GTS 1618cc DOHC 3-cyl engine, 1945 lbs, SIR, no turbo or direct injection.show
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| Virginia International Raceway Runoffs 20222022-09-24 | 2:07.789Peter Shadowen · fastest of 14 · top 5 within 2.2s+0.792s (+0.62%) | 2:21.180Michael Lewis · fastest of 13 · top 5 within 2.1s+13.343s (+10.44%) | 136.0Peter Shadowen+4.9 mph (+3.7%) | 2:14.664Danny Steyn · fastest of 60 · top 5 within 0.2s+0.112s (+0.08%) | 2:19.107Travis Wiley · fastest of 58 · top 5 within 0.9s+2.648s (+1.94%) | 119.2Jonathan Neudorf-0.6 mph (-0.5%) | -2.073squal +6.875s | 98.5%qual 105.4% | 1:59.215Jonathan Kotyk · fastest of 13 · top 5 within 1.2s-0.348s (-0.29%) | 2:18.358Jonathan Kotyk · fastest of 12 · top 5 within 2.4s-2.116s (-1.51%) | 138.3Tim Kautz+2.2 mph (+1.6%) | -2.822squal -8.574s | 98.0%qual 93.3% | 1:47.566Tim Day Jr · fastest of 12 · top 5 within 3.0s-1.545s (-1.42%) | 2:15.834Greg Gyann · fastest of 12 · top 5 within 10.1s+25.576s (+23.20%) | 151.1Robert Iversen+1.8 mph (+1.2%) | -5.346squal -20.223s | 96.2%qual 84.2% | ||
14 rule changes (GTL: 3, SM: 1, P2: 10)3 cars added · 1 weight · 9 wording · 1 other · GT1, GT2, GT3, GTL, GTX tail lights may now be original style or custom panel graphic with functioning red LED brake lamps. · P2 chassis construction clarified: full composite allowed; partial composite must roll without composite parts installed. · P2 classification wording cleaned up in GCR section 9.1.8.C and GCR contents. · P2 Oldsmobile cam rules correct spelling from 'after market' to 'aftermarket' in two sections. · SM Majors must run authorized Penske shock and mount; Regional competitors not required until further evaluation. · Ginetta G40 added to GTL with Ford Zetec 1796cc engine, 2050 lbs minimum weight, 22.5mm SIR. · P2 adds Beasley B2 at 1350 lbs with Mazda 12A, 40.5mm venturi, and up to 16.5in wing chord. · P2 wings: terminology change from 'cord' to 'chord', and 'only' removed from Bobsy and Jondal notes. · P2 Converted F5 cars renamed F500, must retain F500 suspension, minimum width 55 inches. · P2 motorcycle engines gain 5cc to 1505cc max, two-stroke gains 5cc to 1205cc max, automotive engines add 50 lbs minimum weight to 1350 lbs. · P2 Control Area definition clarified: rectangular zone from rear edge of front tires to front edge of rear tires, full car width. · P2 specification line B.1 engine table entry amended; details of change not provided in excerpt. · P2 Control Area definition clarified: rear tire edge and front tire edge bounds, car's lower surface width, floor extensions and aerodynamic attachments included, vertical structures prohibited. · GT3 Volkswagen Fun Cup Beetle EVO3 classified, sealed SOHC 1984cc engine, 2060 lbs minimum weight.show
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| Indianapolis Motor Speedway Runoffs 20212021-09-25 | 1:51.819Christopher Bovis · fastest of 22 · top 5 within 1.8s+1.488s (+1.35%) | 1:51.952Scott Twomey · fastest of 19 · top 5 within 1.7s-0.116s (-0.10%) | 129.5Brian Linn | 1:57.695Brian Henderson · fastest of 90 · top 5 within 0.5s-0.611s (-0.52%) | 1:58.837Brian Henderson · fastest of 88 · top 5 within 0.3s-0.263s (-0.22%) | 119.8Kyle Greenhill | +6.885squal +5.876s | 106.1%qual 105.3% | 1:44.359Jonathan Kotyk · fastest of 24 · top 5 within 1.1s-0.242s (-0.23%) | 1:55.676Jonathan Kotyk · fastest of 23 · top 5 within 1.8s+11.152s (+10.67%) | 141.6Nicholas Sheppard | +3.724squal -7.460s | 103.3%qual 93.3% | 1:33.235Tim Day Jr · fastest of 16 · top 5 within 3.3s+1.409s (+1.53%) | 1:35.322Tim Day Jr · fastest of 10 · top 5 within 4.8s+2.841s (+3.07%) | 150.3Robert Iversen | -16.630squal -18.584s | 85.1%qual 83.4% | ||
20 rule changes (GTL: 8, SM: 1, FF: 3, P2: 8)4 cars added · 2 engine · 2 induction · 1 aero · 9 wording · 2 other · P2 CN Honda K20A-FD2 engine rebuild clarified: balancing, porting, polishing prohibited; valve jobs and honing must follow factory procedures. · GTA part numbers updated: 0-80541-1 to 0-80541-2 in two locations and 6010 to 6014X in TA2 Appendix. · P2 Converted F5 cars must retain F5 suspension and meet P2 non-spec requirements except minimum width is 55 inches. · P2 minimum body width clarified: cannot extend inward beyond vertical plane through tire centerlines. · GTL Honda B18 split into B18A/B at 1797 cc 2050 lbs and B18C at 1834 cc 2065 lbs. · GTL Nissan B13 Sentra may have hood bulge maximum 1.5 inches high by 10.0 long by 6.0 wide. · unclear · P2 tonneau covers now allowed to meet minimum dimensions; cockpit equipment attachment wording clarified. · P2 removes effective date 01/01/2021 from six car spec lines in Table 1. · P2 engine specs B.1, B.2, B.3 limited to maximum 4 valves per cylinder. · FF block relief permitted only as needed to fit an allowed crankshaft. · SM adds procedure for CRB-approved obsolete parts and BOP testing in sanctioned events with point forfeiture. · GTL Mazda 12A SIR increases to 29mm, minimum weight rises to 2000 lbs, 28mm SIR option with 175 lb penalty removed. · P2 adds new spec line for 2-cycle 3-cylinder engine up to 820cc with 10 front, 14–15 rear wheel width. · GTL adds FIAT X-1/9 Bertone 1500 SOHC, 1498 cc, 2000 lbs, fuel injection or carburetors permitted. · GTL Nissan MRA8DE 1.8L engine added, 1797 cc, DOHC, 2050 lbs minimum weight. · GTL Mazda 13B SIR increases from 26 mm to 28 mm; 27 mm option with 175 lbs removed. · FF class cylinder head now permits optional coolant bleed line pipe thread fitting to swirl tower. · FF Honda LC1 ECU supplied by HPD is permitted effective 12/1/2020 with HPD lambda sensor. · P2 motorcycle-engine cars: 2009+ stock 37mm restrictor, 2008- stock 35mm, modified 1075 lbs. Honda K20A 50mm restrictor. Various spec cars: restrictors increased or decreased 0.5–3mm.show
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| Road America Runoffs 20202020-10-02 | 2:31.943Chris Bovis · fastest of 14 · top 5 within 6.3s | 2:31.601Peter Shadowen · fastest of 14 · top 5 within 7.2s | 131.4Peter Shadowen | 2:42.209Kyle Greenhill · fastest of 77 · top 5 within 0.5s | 2:43.748Preston Pardus · fastest of 75 · top 5 within 1.0s | 121.3Kyle Greenhill | +12.147squal +10.266s | 108.0%qual 106.8% | 2:22.916Simon Sikes · fastest of 14 · top 5 within 1.6s | 2:24.268Jeffrey Bartz · fastest of 14 · top 5 within 0.4s | 138.1Jeffrey Bartz | -7.333squal -9.027s | 95.2%qual 94.1% | 2:08.514Robert Iversen · fastest of 12 · top 5 within 3.0s | 2:09.793Robert Iversen · fastest of 12 · top 5 within 3.9s | 153.1Robert Iversen | -21.808squal -23.429s | 85.6%qual 84.6% | ||
29 rule changes (GTL: 17, SM: 2, FF: 4, P2: 6)5 aero · 4 cars added · 3 engine · 2 induction · 2 suspension & brakes · 1 tyres & wheels · 1 weight · 9 wording · 2 other · 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. · GT1/GT2/GT3/GTL/GTX turbocharging and supercharging now permitted if listed on spec line. · P2 rear wing rules clarified: standard wing 6×12 inches, end plates 14-inch square; alternate 1-meter formula wing 110cm wide, 9×18 inches, end plates 14×18 inches. · FF Honda LC1 ECU implementation date clarified to pending, contingent on SCCA receiving sufficient support materials. · GTL Mazda 13B restrictor increases from 24mm to 26mm SIR, minimum weight rises to 2125 lbs, alternative 27mm SIR option adds 175 lbs. · SM rear brake caliper may use single bracket under upper retaining bolt head to prevent pin failure. · GTL: Toyota MR2 Spyder 1999–2007 newly classified for GTL competition. · TA2 Gurney flap wording clarified: replace 'wicker bill' and 'wicker' with 'Gurney flap' throughout wing specifications. · STO rear wing rules clarify that wicker is called Gurney flap in two places; no performance change. · GT Gurney flap wording clarified: wickerbill and tab terminology replaced with Gurney flap throughout sections 9.1.2.F.7.b. · GTL Mazda 13B restrictor size addressed in response to letter 28518; see that letter for details. · GTL SIR stall test procedure clarified: system tested as raced, competitor must prevent air bypass behind restrictor. · Elan NP01 added to P2 Table 1 as Spec Line car with 2000cc displacement and 42mm restrictor. · GTL wing mount openings excluded from square inch area limit. · P2 Enterprises Sports Racer now permits 55mm flat plate intake restrictor Part # WM303013 as alternative to SIR. · FF Kent Engine alternator becomes optional instead of not required. · P2 Enterprise Sports Racer 2.3L engine must use SIR or Flat Plate restrictor meeting peak horsepower, sized in whole or 0.5mm increments. · FF permits HPD LC1 ECU with lambda sensor; E1 ECU no longer supported but existing units may continue. · FF rain tyres now allow Hoosier W3 Radial 185/60R13 front and 205/60R13 rear. · GTL wing mounting posts limited to 85 square inches exposed area each, measured flat from side view. · GTL wing mounting posts limited to 85 square inches each, measured flat from side view. · GTL wing endplates maximum area increased to 64 square inches from 8.5 by 3.0 inches rectangle. · GTL Mazda 12A street port minimum weight drops to 1950 lbs. · P2 electronic throttle control wording clarified: ETC permitted if stock ECU throttle pedal activates original throttle shaft mechanism. · GT1, GT2, GT3, GTL, GTX may use bonded-glass factory windshields without clips or straps if attached per original specifications. · GTX Misc. adds Factory Five Type 65 Coupe R Ford 302/351 and 5.0/5.2L NA at 2600 lbs, plus Ferrari 458/488 Challenge, Ford FP350S, Chevrolet C6, Lamborghini Super Trofeo. · GTL adds Jetta Mk1 two-door classification effective 2020-01-01. · P2 adds BMW to permitted motorcycle-based engines alongside Kawasaki, Suzuki, Yamaha, Honda. · GTL Honda CRX 84-87 and 88-91 lose permission to use IRS with 2.5% weight penalty.show
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| Virginia International Raceway Runoffs 20192019-10-05 | 2:06.997Peter Shadowen · fastest of 19 · top 5 within 4.0s | 2:07.837Bill Ball · fastest of 18 · top 5 within 4.2s | 131.1Peter Shadowen | 2:14.552Todd Buras · fastest of 60 · top 5 within 0.2s | 2:16.459Elivan Goulart · fastest of 56 · top 5 within 0.4s | 119.8Jim Drago | +8.622squal +7.555s | 106.7%qual 105.9% | 1:59.563Tyler O'Connor · fastest of 14 · top 5 within 1.4s | 2:20.474Jonathan Kotyk · fastest of 14 · top 5 within 6.3s | 136.2Derek Ketchie | +12.637squal -7.434s | 109.9%qual 94.1% | 1:49.111Robert Iversen · fastest of 14 · top 5 within 0.8s | 1:50.258Greg Gyann · fastest of 13 · top 5 within 0.4s | 149.4Robert Iversen | -17.579squal -17.886s | 86.2%qual 85.9% | ||
29 rule changes (GTL: 13, SM: 4, FF: 3, P2: 9)7 engine · 5 cars added · 2 induction · 2 weight · 1 aero · 1 removed · 8 wording · 3 other · P2 Honda K20A-FD2 non-composite chassis intake restrictor note clarified; restrictor implementation date removed. · GTL Fun Cup Beetle engine weight set to 1850 lbs with Weber DMTL 32/34 induction. · P2 motorcycle engines: Stock restrictor to 35mm, Modified to 34mm; weights up to 1025 and 1125 lbs respectively. B.5 restrictor to 33mm, weight to 1185 lbs. · GTL Fun Cup Beetle removes reference to VW engine table; Fun Cup engines only permitted. · GTL Honda CRZ 10-14, CRZ 15-16, and Insight 00-06 gain alternate wheelbase option of 90.6 inches. · P2 cars limited to power application on maximum two wheels. · P2 Enterprise minimum weight increased to 1375 lbs.; peak horsepower of sealed ESR engine reduced per CRB specification. · GTL Fun Cup Beetle added, all model years, 2-door RWD, 94.5 in wheelbase, VW Fun Cup spec chassis. · GTX tube frame cars now allowed fuel injection with maximum 90mm throttle body. · GTX adds Ligier JS2 R classification with restrictor and minimum weight. · GTL Mazda 13B may use 25mm SIR with 175 lbs weight penalty added. · GT1 and GT2/3/Lite remove ride height ground clearance rules; cars may now touch ground when tires deflate. · GTL Mazda 12A may use 28mm SIR plus 175 lbs. · GTL: Ford Mustang 94-04 body newly classified for GTL racing. · P2 stock and modified engines get smaller restrictors (35.0mm, 34.0mm, 33.0mm) and heavier minimums (1025, 1125, 1185 lbs). · P2 Line A.1 restrictor reduced from 40mm to 38mm. · SM fuel pump and filter now permitted as Mazda or OEM equivalent part. · FF Honda Fit cylinder honing increased to 73.315mm and oversize pistons PN 13020-RB7-Z00 now permitted with matching ring packs. · FF intake manifold thermal wrap now permitted if easily removable for inspection; no coating allowed. · FF clarifies coolant and oil catch tank capacity requirements: coolant minimum one U.S. pint, oil minimum one U.S. quart per system. · 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. · GTL Mini 1275–1399 Iron and Aluminum Crossflow with OE common sump gearbox reduce weight by 125 lbs, up from 50 lbs. · GTL BMC thru Rover Group removes four long inactive Mini engines: 948, 970, 1071, 1098. · GTX FIA GT3: Audi R8 now 40 mm restrictor and 2900 lbs; BMW Z4 now 70 mm restrictor and 2800 lbs; Ferrari 488 now 35 mm restrictor, TIR, and 3025 lbs. · P2 Spec Line cars now allow 1345cc Hayabusa stock engines at 1050 lb minimum with 30mm restrictor. · P2 Group CN Honda K20A-FD2 55mm intake restrictor implementation delayed from 1 January to 3 March 2019. · P2 Honda K20A-FD2 Group CN must use stock intake manifold, 64mm throttle, 55mm restrictor at 1500 lbs minimum.show
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| Sonoma Raceway Runoffs 20182018-10-10 | 1:47.885Troy Ermish · fastest of 20 · top 5 within 4.5s | 1:49.458Troy Ermish · fastest of 19 · top 5 within 3.6s | 109.3Charles Leonard | 1:54.355Ken Sutherland · fastest of 48 · top 5 within 0.7s | 1:55.278Michael Carter · fastest of 48 · top 5 within 0.3s | 102.2Danny Steyn | +5.820squal +6.470s | 105.3%qual 106.0% | 1:41.612Jonathon Kotyk · fastest of 22 · top 5 within 1.7s | 1:42.049Jonathon Kotyk · fastest of 22 · top 5 within 1.3s | 115.7Denny Renfrow | -7.409squal -6.273s | 93.2%qual 94.2% | 1:28.784Tim Day Jr · fastest of 17 · top 5 within 5.0s | 1:32.071Chuck Bona · fastest of 18 · top 5 within 0.9s | 144.4Tim Day Jr | -17.387squal -19.101s | 84.1%qual 82.3% | ||
| No rule changes on record between these events | ||||||||||||||||||||
| Indianapolis Motor Speedway Runoffs 20172017-09-25 | 1:50.331Christopher Bovis · fastest of 26 · top 5 within 1.5s | 1:52.068Christopher Bovis · fastest of 20 · top 5 within 1.0s | 1:58.306Chris Haldeman · fastest of 86 · top 5 within 0.5s | 1:59.100Michael Gagliardo · fastest of 83 · top 5 within 0.6s | +7.032squal +7.975s | 106.3%qual 107.2% | 1:44.601Zach Holden · fastest of 36 · top 5 within 1.2s | 1:44.524Jonathon Kotyk · fastest of 36 · top 5 within 0.5s | -7.544squal -5.730s | 93.3%qual 94.8% | 1:31.826Jeff Shafer · fastest of 26 · top 5 within 4.9s | 1:32.481Jeff Shafer · fastest of 24 · top 5 within 3.8s | -19.587squal -18.505s | 82.5%qual 83.2% | ||||||
| No rule changes on record between these events | ||||||||||||||||||||
| Mid-Ohio Sports Car Course Runoffs 20162016-09-19 | 1:35.377Wilson Wright · fastest of 28 · top 5 within 1.2s | 1:35.912Kyle Disque · fastest of 28 · top 5 within 1.1s | 1:40.514Justin Hille · fastest of 45 · top 5 within 0.3s | 1:40.764Michael Carter · fastest of 44 · top 5 within 0.3s | +4.852squal +5.137s | 105.1%qual 105.4% | 1:29.213Neil Verhagen · fastest of 14 · top 5 within 2.1s | 1:30.133Neil Verhagen · fastest of 14 · top 5 within 1.4s | -5.779squal -6.164s | 94.0%qual 93.5% | 1:20.188Jeff Shafer · fastest of 18 · top 5 within 4.0s | 1:20.904Jeff Shafer · fastest of 16 · top 5 within 2.2s | -15.008squal -15.189s | 84.4%qual 84.1% | ||||||
| No rule changes on record between these events | ||||||||||||||||||||
| Daytona International Speedway Runoffs 20152015-09-21 | 2:11.387Jim Dentici · fastest of 10 · top 5 within 2.2s | 2:13.564Jim Dentici · fastest of 9 · top 5 within 2.0s | 2:18.661Andrew Carbonell · fastest of 62 · top 5 within 0.6s | 2:24.067Todd Lamb · fastest of 59 · top 5 within 0.8s | +10.503squal +7.274s | 107.9%qual 105.5% | 2:02.489Tim Kautz · fastest of 25 · top 5 within 1.1s | 2:03.383Rick Payne · fastest of 22 · top 5 within 0.8s | -10.181squal -8.898s | 92.4%qual 93.2% | 1:51.825Chris Farrell · fastest of 17 · top 5 within 3.6s | 1:52.355Jeff Shafer · fastest of 17 · top 5 within 2.8s | -21.209squal -19.562s | 84.1%qual 85.1% | ||||||
By track
| Track | Events | Typical % of GTL | Best | Latest |
|---|---|---|---|---|
| Road America | 4 | 100.0%2 of 4 with GTL | 100.0%Runoffs 2020 | 100.0%Runoffs 2024 |
| Virginia International Raceway | 3 | 100.0% | 100.0%Runoffs 2019 | 100.0%Runoffs 2023 |
| Indianapolis Motor Speedway | 2 | 100.0% | 100.0%Runoffs 2017 | 100.0%Runoffs 2021 |
| Daytona International Speedway | 1 | 100.0% | 100.0%Runoffs 2015 | 100.0%Runoffs 2015 |
| Mid-Ohio Sports Car Course | 1 | 100.0% | 100.0%Runoffs 2016 | 100.0%Runoffs 2016 |
| Sonoma Raceway | 1 | 100.0% | 100.0%Runoffs 2018 | 100.0%Runoffs 2018 |
About this data
Every event the class ran, at any track, oldest to newest on the chart and newest first in the table. Each point is the class's best lap as a share of GTL's best on the same day: the weather, the track and its configuration cancel out, so one figure compares across tracks and years where lap times cannot. It still moves when the yardstick's own balance changes or its field thins, and an event the yardstick did not run has no point. A best from fewer than three cars is greyed. The rule changes that took effect between two events are folded between their rows.