BoP Lab / Buttonwillow Raceway Park

GT2 pace at Buttonwillow Raceway Park

Quickest here: GT2 1:42.698 Tim Carroll, Cal Club 2026 qualifying

GT2solid race · dashed qualifying · slower is lower

	Event	GT2
	Event	Qual best	Race best	Trap
	Cal Club 2026 CALCL262026-02-21	1:42.698Tim Carroll · fastest of 8 · top 5 within 7.4s-3.120s (-2.95%)	1:44.128Tim Carroll · fastest of 8 · top 5 within 4.3s-2.798s (-2.62%)	155.7Rocky Crocker+37.8 mph (+32.1%)
8 rule changes (GT2: 8)2 aero · 2 cars added · 2 engine · 1 induction · 1 othershowhide 2026-02-01 Allow Larger Air Cooled Engines in Porsche 911 GT2 #39249engine 2026-02-01 Classify T1 BMW in GT2 #39408cars added 2026-01-01 Additional Body Options to Replace Older Stock Car Bodies #39086other 2026-01-01 GT3 Turbo to GT2? #39365induction 2026-01-01 Tech Bulletins for GT2 and GT2-ST #39537cars added -100 lbs 2025-08-01 Rear Deck Lid for Older Air-Cooled Porsche #38506aero 2025-03-01 Hood Bulge allowed #37000engine 2025-03-01 OEM Wing Adjustment #37590aero
	Cal Club 2025 CALCL252025-02-22	1:45.818Brad McAllister · fastest of 6 · top 5 within 14.6s	1:46.926Brad McAllister · fastest of 6 · top 5 within 13.3s	117.9Guy Laidig
113 earlier rule changes on record, in force before Cal Club 2025 (from 2019)30 weight · 21 cars added · 18 induction · 16 engine · 8 aero · 3 suspension & brakes · 2 tyres & wheels · 8 wording · 7 othershowhide 2025-02-01 GT2/ST - Remove Aftermarket/Racing ABS penalty #36538weight 2025-01-01 Panoz Esperante GTS BOP #36686cars added 2025-01-01 Correct language regarding OEM Areo Devices #37137aero 2025-01-01 GT2 Sunbeam Tiger Alternate Carburetor #37198induction 2024-07-01 GT2-ST Rule Clarification #36093wording 2024-07-01 GT4 cars may run in GT2-ST #36235weight 2024-05-01 Request for Spec Line 1010 Reconsideration #35009weight +300 lbs 2024-05-01 Request to Eliminate the FPR from the Corvette (-2013) with LS2 #35878induction 2024-03-01 Classify Corvette C8 (2020- ) into GT2/ST #33759cars added 2024-03-01 Requesting classification for a 2015 Mitjet ST in GT2 #35408cars added 2024-02-01 Rear Blade Spoiler Clarification #35261aero 2024-02-01 GT Direct Injection allowance and rules #35437engine 2024-02-01 REDUCE C6 CORVETTE WEIGHT WITH OEM 7 LITER ENGINE REDUCE BY 150LB #35385weight -150 lbs 2024-02-01 GT2/3 remove Direction Injection not allowed in Spec line notes #35439engine 2024-01-01 Dodge Viper Gen 3 hybrid Kit Update Request #35200induction 2023-12-01 Errors in GTCS Headings and Use of the Terms Category and ClassChange existing GTL and GTA Rules #34453weight 2023-10-01 Late E & O #34966wording 2023-09-01 GT2 Mazda 20B 3 rotor ENO #34765weight -220 lbs 2023-07-01 appendix letter #33635 #34206weight 2023-07-01 Remove Weight and Restrictor Penalty for Corvette C7 Body #34342weight 2023-05-01 Request to class 2011 Porsche Cayman S #33771cars added 2023-05-01 Please classify Fields Cardinal V8 #33784cars added 2023-04-01 Adding Ginetta G56 GTA Factory ProTune for GT2 Class #33825engine 2023-02-01 GT2 Mazda 13B Turbo #33729induction 2023-01-01 Request Permission to Use a Substitute Turbo #33337induction 2023-01-01 Request to Reduce Restriction on C7 GT2 Corvette #33342induction 2023-01-01 Toyota 4A-F and 4A-FE 1.6L DOHC 16V Engine Request #33415engine 2023-01-01 GT2 Mazda 13b turbocharger part # update #33437induction 2023-01-01 GT2-ST BMW E36/46 spec line remove #33610aero 2023-01-01 GT3 Choke option effective 1-01-2023 #33669induction 2023-01-01 GT3 2.0L choke/weight option #33670weight 2023-01-01 BOP adjustment for GT2 & GT2-ST #33681induction 2022-12-01 GT2 (TA2)/GTA Part Number Update #33315induction 2022-12-01 Ginetta G56 GTA - Optional Wheels #33357tyres & wheels 2022-11-01 Allow the MAShaw Body Kit on the GT2/ST Spec Line for BMW E36/E46 #32447aero 2022-10-01 Request for C5/C6 Corvette Restrictor Size Review #32982induction 2022-09-01 Tail lights on all GT category race cars. #32799suspension & brakes 2022-09-01 Addendum to letter #32514 Ginetta GTA G56 #33076cars added 2022-08-01 Information requested for carbon roofs on BMW E36/E46 cars in GT2 #32682wording 2022-08-01 Request to Allow the 95mm S54 BMW Crankshaft in GT2-ST #32698other 2022-08-01 Request to classify Audi R8 FIA GT4 to GT2 #32805cars added 2022-05-01 Typo in rules for shocks #32308suspension & brakes 2022-05-01 additional response to letters #31898 & 32083 #32424weight +140 lbs 2022-03-01 Request to Classify Ginetta G40 in GT2 #31597cars added 2022-03-01 2021 Supra GR GT4 #31737cars added 2022-03-01 Proposed Technical Bulletin #31900induction 2022-02-01 GT2/ST Porsche Cayman #31451 correct TBR size error #31991wording 2022-01-01 Restrictor Clarification for 2015 Cayman #31451induction 2021-10-01 Turbo Request for 13B Engine #30656induction 2021-10-01 Request car classification #31032cars added 2021-09-01 Correct letter 30565 GT2/ST #31088weight 2021-08-01 Request the 04-06 Pontiac GTO WC Car Be Added to the GT2/ST Chart #30339cars added 2021-08-01 Request to Update GTA Obsolete Part Numbers #30615wording 2021-08-01 GTX class correction to GT2/ST #30973cars added 2021-07-01 Porsche Cayman Engine Modification and Engine Request #30472engine 2021-07-01 Request weight clarification Viper CC #30565weight 2021-07-01 Variance, 2021 TA2 Rules vs GCR Appendix L #30641weight 2021-04-01 GT2 tiger firing order #30421engine 2021-03-01 GT2-ST CORVETTE CHANGES #30029weight +100 lbs 2021-03-01 Request underfloor clarification #30121tyres & wheels 2021-03-01 29742 Change new wording to read as: #30329engine 2021-02-01 ABS Restrictions #30064other 2021-02-01 RM 21-01 C6 & C7 clarification #30192weight 2021-01-01 Request change to engine firing order rule #29742engine 2021-01-01 Request E-46 BMW M3 balance of performance #29833weight -100 lbs 2020-12-01 Request for Bigger Engine in Plymouth Breeze #29380engine 2020-10-01 rescind GT2 stock car bodies removal #29219other 2020-10-01 E&O Typos in Appendix L #29447wording 2020-10-01 GT2 wing width wording correction #29469aero 2020-09-01 GT Category Wording #29193induction 2020-09-01 Corvette GT2-ST intake manifold #29221induction 2020-09-01 997.2 E&O link to 27915 #29373other 2020-08-01 Request for allowance Trans Am SGT #28951weight 2020-08-01 Omitted GT2 fender/hood openings #29171other 2020-07-01 TA2 Gurney flap wicker clarification #28874aero 2020-07-01 STO Gurney flap wicker clarification #28883aero 2020-07-01 GT Gurney flap wicker clarification #28909aero 2020-06-01 Request to Adjust Weight of OEM 8.4 Viper #28739weight -50 lbs 2020-06-01 Request to Adjust Weight of OEM Chevrolet Corvette #28896weight -50 lbs 2020-05-01 Request Corvette engine parity #28576engine 2020-04-01 Request to revisit Panoz GT-S BoP #28280engine 2020-04-01 GT2-ST Corvette LS2 & L76 #28583weight 2020-04-01 GT2-ST Corvette L76 #28584weight 2020-03-01 Request 991.2 Porsche engine displacement verify typo #28194engine 2020-02-01 Windshield Clips #27323other 2020-02-01 Request to Add Chevrolet SS Body to Appendix L #27898wording 2020-01-01 Request Factory Five Daytona coupe classification #26308cars added 2020-01-01 Porsche 991.2 GT3 Cup GT2 Classification #27701cars added 2020-01-01 Request for Acura NSX Spec Line Changes #27755weight 2020-01-01 GT2 991.1 restrictor size change #27914induction 2020-01-01 GT2 996/997.1 weight change #27915weight -100 lbs 2020-01-01 GT2/ST Corvette comp adjustment #27920induction 2019-07-01 TA2 Weight Clarification #27077weight 2019-05-31 Request to classify Toyota Supra with 3SGTE engine #25185cars added 2019-05-31 Request to Classify Acura NSX from T1 to GT2? #26121cars added 2019-05-31 Request for TA2 BOP in GT2 #26509weight 2019-05-01 Request for e36/e46 bmw 4500 cc v8 at 2950lbs in GT2/ST #26106engine 2019-05-01 Request GTX Fuel injection for previous GT-1 tube frame cars #26141engine 2019-05-01 Request to Classify Ligier JS2 R #26535cars added 2019-04-01 Request Ford Perfomance 5.2L crate engine FPR clarification #26159engine 2019-04-01 Request Ride Height Clarification #26600suspension & brakes 2019-03-01 Request Porsche Cayman year classification #26241other 2019-03-01 GT2/ST Porsche Cayman engine #26250engine 2019-01-01 ST/GT2 BMW Flossman Kit Clarification #22138wording 2019-01-01 Request Clarification/Revision of Appendix L (2013 TA2 Rules) #25110weight 2019-01-01 Request to classify BMW E82 (1 series) into GT2 #25539cars added 2019-01-01 2010 Cayman Street Tuner Into an STO Car,Addendum #25545weight 2019-01-01 Request - Classify Ford Performance 5.2l #25716cars added 2019-01-01 Add missing displacement, minimum weight. Remove #25765weight 2019-01-01 Request for Ford FP 350s Weight Reduction #25806weight 2019-01-01 Request to Classify EcoBoost Mustang #25842cars added 2019-01-01 Request to Remove Mazda RX 7 Body Work Penalty #26024weight 2019-01-01 GTX Homologation table update #26034cars added

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. 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.