BoP Lab / Mid-Ohio Sports Car Course
STU vs GT3 pace at Mid-Ohio Sports Car Course
Quickest here: STU 1:35.716 Tony Ave, Great Lakes Champions 2026 qualifying · GT3 1:38.003 Michael Lewis, Great Lakes Champions 2024 qualifying
| Event | STU | GT3 | ||||||||
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| Qual best | Race best | Trap | Qual best | Race best | Trap | vs STU | % of STU | |||
| Great Lakes Champions 2026 GREALA262026-05-15 | 1:35.716Tony Ave · fastest of 10 · top 5 within 1.4s-1.871s (-1.92%) | 1:36.249Tony Ave · fastest of 10 · top 5 within 1.7s-0.738s (-0.76%) | 133.5John Mills+0.1 mph (+0.1%) | |||||||
19 rule changes (STU: 16, GT3: 3)5 weight · 4 cars added · 3 tyres & wheels · 2 induction · 1 suspension & brakes · 4 wording · STU Honda K20C1 turbo restrictor increases from 35mm to 36mm TIR. · STU GT86 Cups Car must meet 2022 Toyota GR Cup rules, including DOT tires with maximum section width of 245. · STU Mazda Renesis Street Port added to Table B with 2450 lbs minimum weight, street porting allowed. · STU eliminates 33 and 34 mm restrictor options, removing 2380 and 2525 lb minimum weight entries. · GT3U class removed from GCR; GT3U cars now run in STU with 3.0" main frame and 2" front spoiler minimum ride height. · STU Mazda MZR (LF, L3, L5) adds Fab 9 Elite NC MX5 Performance Intake manifold as approved option. · GT3U cars must maintain 3.0" minimum ride height on frame rails and 2" minimum on front spoiler and splitter. · STU Mazda MZR (LF, L3, L5) Turbo classified; Jack Spania Racing 70 mm intake manifold and Fab9 Tuning bottom-mount turbo kit approved. · STU 36mm restrictor allows 2830 lbs (up 10 lbs from 2820); 37mm allows 2980 lbs (down 5 lbs from 2985). · STU cars over 3150 lbs lose 275-tire option with 2% weight adder. · STU Honda K20 and K24 engines lose 2% minimum weight penalty. · STU Honda K24 engine swap weight increases by 2% effective November 1, 2025. · STU Lotus Elise SC and Exige SC weight reduced from 2450 to 2250 lbs. · GT3U cars with 15×7" wheels add 225 lbs to GT3 weight; wider wheels allowed with weight penalties up to 3.0%. · STU-TCR tire width increases to 275 with weight adder raised from 100 to 150 pounds. · STL/STU Lotus weight reduced: Evora GT4 to 2700 lbs, Elise Cup R to 2250 lbs, Elise/Exige SC to 2450-2550 lbs. · STU 2.8-3.2L N/A engines now allow 245 max tire width; over 3150 lbs may run 275 with 2% weight penalty. · STU Mazda MZR may use Goodwin 61-2510 or Gato Performance 31972 intake manifold. · STU Honda JDM H23a added, 2259cc displacement, minimum weight per Chart, must meet ST engine regulations.show
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| Ohio Valley Great Lakes Champions 2025 OHIOVA252025-05-16 | 1:37.587Chip Herr · fastest of 5 · top 5 within 3.0s | 1:36.987Chip Herr · fastest of 5 · top 5 within 1.0s-0.154s (-0.16%) | 133.4David Fiorelli | |||||||
28 rule changes (STU: 13, GT3: 15)12 weight · 5 induction · 4 cars added · 2 engine · 1 tyres & wheels · 4 wording · GT3U with 15x7 wheels and 225 tires gains 75 lbs to 225 lbs over GT3 weight; wheel weight penalties clarified. · STU wheel width rules clarified: cars ≤2,850 lbs max 8 inches, cars >2,850 lbs max 9 inches. · STU Spec Line GT3U minimum weight reduced from plus 250 to plus 225 pounds; wheel and tire options clarified with weight adjustments. · STU BMW N54/N55 3.0L classified at Chart +3% minimum weight; N54 twin turbo not allowed. · STU Mini Cooper S SC supercharger pulley diameter reduced from 2.285 to 2.185. · STU Honda K20C1 Turbo I4 exempted from 3% DI weight adder in Spec Lines Table A. · STU GT3U minimum weight increases 150 to 250 pounds. · 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. · STU Audi 1.8T wagon deleted; Porsche 944 1800 weight to Chart, turbo inlet restrictor removed. · STU-GT3 reclassified as STU-GT3U effective January 1, 2026. · STU GT3 TCR gains 275-width tire option with 100 lb weight penalty, but not in A compound. · GT3 Pontiac LE5 Ecotech minimum weight drops 150 lbs to 2195. · STL/STU: 90-05 Mazda Miata alternate front wheel hubs moved from General to specific part approval. · STU BMW N54/N55 turbo inlet restrictors now required per GCR definition; turbo swapping prohibited. · 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. · STU Mini Cooper S SC 1900 restricts to 2.565 diameter pulley; 2100 allows 2.285 diameter pulley. · GT3 Mazda 3TC classified in TCR with 2950 lbs minimum weight, effective 11/1/2024. · 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. · STU RWD turbo cars no longer required to reduce restrictor by 1 mm from table. · 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.show
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| Great Lakes Champions 2024 GREALA242024-05-17 | 1:37.141John Weisberg · fastest of 5 · top 5 within 8.7s | 1:38.003Michael Lewis · fastest of 4 · top 4 within 9.0s | 1:38.834Armen Megregian · fastest of 4 · top 4 within 0.9s | +1.693s | 101.7% | |||||
159 earlier rule changes on record, in force before Great Lakes Champions 2024 (from 2019)36 cars added · 21 induction · 18 engine · 17 weight · 8 aero · 6 tyres & wheels · 1 removed · 52 wording · 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. · GT3 Miata Turbo restrictor increases to 35 mm, minimum weight rises to 2350 lbs. · STU Mini Cooper S SC: alternate LEAP OMICRON hood scoop LEP-OMICRON3 permitted. · STU BMW S54 B32 OEM now permits dry sump oiling system. · 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. · STL and STU power steering rules clarified to permit electric-assisted and hydraulic-assisted steering systems. · 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. · Toyota GR Cup and GR86 Cup (2022-) newly classified in STU at 2700 lbs with 2387 cc engine. · Fields Cardinal V8 classified in GT1 with Ford V8 engine, 4.9L displacement, 2100 lbs minimum weight. · STU Mazda BP5A classified at 1839 cc maximum displacement, 2023-04-01. · STU minimum weight chart updated: 2450cc to 2595lbs, 2600cc to 2710lbs. · 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. · 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. · STU Mazda 13B Turbo classified, streetport only, stock turbos prohibited, alternatives allowed. · STU OEM louver vents now exempt from vent count and 200 square inch allowance. · STU 2400cc non-4-valve engines gain 9% base weight reduction; DI turbo prep limits removed. · GT3 Fiat 124 Spider model name corrected from Pininfarina to Pininfarina Spider. · STU normally-aspirated 2976–3200 cc single-throttle engines lose 10% base engine weight reduction. · ST redundant language removed from balance shaft and pulley modification rules. · 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%. · STU cars that qualified for 9 inch wheels in 2021 may continue through 2022 only. · STU splitter definition clarified: must be single-plane with no vertical deviations, attached to lowest front point. · 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… · STU BMW S52B32 minimum weight drops 90 lbs to 3110; max displacement cut to 3152 cc. · STU BMW S50B32 Euro classified at 3201 cc displacement, 3300 lbs minimum weight. · ST engine swap origin country requirement changes from North America to the United States for case-by-case approval. · STU Honda CRX (84-91) and Civic Del Sol (93-97) ineligible for front wheel drive weight reductions. · STU vehicles at or over 2950 lbs base weight may use 9 inch wide wheels instead of 8.0 inch maximum. · STU minimum weights reduced: 2450cc to 2596 lbs, 2500cc to 2635 lbs, 2550cc to 2675 lbs. · 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. · STU normally aspirated engines: minimum weights reduced up to 310 lbs; single throttle body weight reduction removed. · STU Audi A4 1.8T minimum weight fixed at 3050 lbs, VF30 turbo with 35mm restrictor now required only. · STL and STU Improved Touring vehicles must conform to 9.1.4 Tires & Wheels requirements. · GT3 adds Fiat Spider 2000, Years 79-81, RWD, 89.76" wheelbase. · GT3 adds Fiat X-19, years 72-89. · STU engines may delete balance shafts and plug openings; alternate pulleys allowed for timing belt or chain operation only. · STU hood vents allowed to include louvers within 200 sq. inch area. · STU adds Honda K23 with 2354cc displacement and minimum weight per chart, K24 block allowed with K23 internals and head. · STU Honda K23 internals rule relaxed to require only K23 crankshaft, allowing other internal modifications. · STL and STU piston engines clarified: intake manifold and cylinder head porting remains free. · 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. · 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. · STU fender flare wording clarified: exterior contour of any wheel opening may not change opening size, location or shape from side view. · STU Mazda 12A Bridge Port Miata weight reduced from 2550 lbs to 2350 lbs. · 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. · STU fender flare rules clarified: maximum 2 inches, must cover tire contact patch from above, cannot alter body configuration or wheel opening geometry. · STU Honda S2000 allows F20/F22 K24 crankshaft with chart weight for achieved displacement. · ST oil coolers and filters now explicitly allowed to be added or substituted; wording clarifies existing permissions. · STL/STU 90-05 Mazda Miata gains approval for Mazda Motorsports Development alternate front wheel hubs. · ST cars may relocate ABS actuation hardware and wiring anywhere in engine compartment. · STU Porsche PDK automatic transmission limited to 8 forward speeds instead of torque converter restriction. · STU Mazda 13B Street Port 2400 removes choke location restriction, allows auto-type 2bbl with dual-Y manifold. · STU driveshaft and half-shaft materials change from OEM-type to steel or aluminum. · STU Mazda 13B Street Port classified at 2400 lbs minimum weight, replacing peripheral and bridge port variants. · 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. · ST aero devices and reference areas now include end plates but exclude fasteners protruding over 1/2 inch. · GT1, GT2, GT3, GTL, GTX now permit turbocharging/supercharging if listed on spec line. · STU fender flare rules reworded: up to 2" per corner allowed with 1% weight penalty total. · STL and STU clarify weight adjustment calculation order: engine adjustments first, then chassis adjustments. · STL and STU rear wing rules clarify that wicker is a Gurney flap; no performance change. · 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. · STU request for alternate intake manifold denied; no rule change issued. · GT3 and STU add Borg-Warner EFR6258 to approved turbocharger list. · STU large displacement turbo engines limited by GCR turbo list; non-turbo trim suggested as more competitive. · STU sequential shifters referred to Board of Directors for approval; no change implemented yet. · GT3 Nissan KA24E loses permission to use 32mm chokes at 2280 lbs for 2011-2012 only. · STU Mazda 13B Bridge Port and Street Port engines added with 2550 and 2250 lbs minimum weights respectively. · STU Honda S2000 adds HKS Supercharger kits 12001-AH006 and 12001-AH010 as allowed. · STU Lotus Elise Cup R and SC models, plus Exige SC, gain 100–200 lbs minimum weight. · STU Volkswagen GTI/GLI MK5 and Jetta Mk4 may install turbo inlet restrictor in OEM turbo inlet housing. · STU Honda K20C1 Turbo I4 restrictor reduces from 36mm to 35mm. · STU GM Ecotech LNF now allowed with turbo removed or with LE5 head and intake manifold, meeting STL specs. · STU Porsche 944 now permits VW/Audi 1.8L and 2.0L turbo engines as alternates. · GT3 Mazda MZR L5-VE gets 31mm SIR restrictor, weight up from 1950 to 2195 lbs, direct injection banned. · STU vehicles over 2951 lbs base weight may use 9 inch wide wheels, up from 2950 lbs. · STU turbocharged engines now use base weight instead of minimum weight, with 3% DI increase applied to base weight. · 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. · GT3 Nissan adds SR16VE engine, 1596cc, 1690 lbs, unrestricted induction. · STU cars with manual OEM throttle bodies may convert to OEM electronic throttle body of same inner diameter. · GT3 Mazda 12A Bridgeport gains optional 42mm choke at 2010 lbs minimum weight. · STU wing assembly wording corrected: no part higher than roof height. · STU Nissan SR20DET removes -2mm penalty in Table B. · STU alternate intake manifolds now allowed case-by-case instead of prohibited. · STU aftermarket side skirts must meet 3-inch ride height, no openings except jacks or side exhaust, no wider than fascias, not higher than door bottom, no chassis reinforcement. · STU fender flare wording clarified: each fender may be flared up to 2" for tire clearance with 1% weight penalty. · 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. · STL and STU ride height measurement clarified: without driver, at rocker panel lowest point, excluding pinch weld. · 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. · STU Mazda 13B Bridge Port may use ELITE ROTARY SHOP FD V2.0 intake manifold instead of stock. · STU Mazda MZR LF/L3/L5 may use Goodwin Part #61-2510 intake manifold with stock or Acura throttle body. · STU suspension rules clarified: alternate components from same manufacturer moved from section E to section D. · STU Honda/Acura B20 classified at 1973 cc, now permits VTEC B16 or B18 cylinder head and intake manifold. · STU flared fenders up to 2" with 1% weight penalty moved from base to Advanced Aero rules. · TCA Honda Civic Si (2017-) must run 37mm TIR maximum as of June 1, 2019. · STU BMW S54B32 OEM reclassified from E46 designation, 3246 cc, 3300 lbs minimum weight. · 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. · Honda Civic Si 2017- classified STU at 1500cc, 2800 lbs minimum with OEM engine and bodywork. · STU BMW E46 S54 OEM 3246cc added at 3300 lbs minimum weight, no Super Touring allowances. · STU Mazda 13B and 13B Bridge Port may use RE or REW housings and intake with turbo removed. · STU Honda K24 may use intake part #s 17100-RRB-A00 or 17100-PRB-A10. · STU Mazda 12A Bridge Port engine classified at 2550 lbs minimum weight with specified carburetor induction options. · STU World Challenge car weight calculation method removed; new basis unclear from text provided. · STU AWD cars no longer required to reduce restrictor 1 mm from table. · STU rear wing maximum cord length set to 12 inches, end plates to 72.0 square inches each. · GTX FIA GT3: Audi R8 40mm restrictor 2900 lbs, BMW Z4 70mm 2800 lbs, Ferrari 488 35mm restrictor 3025 lbs classified. · STU Honda K20C1 Turbo I4 1996cc added at 3025 lbs minimum weight with 36mm TIR.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 STU" is the class's best as a share of STU'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 STU'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.