BoP Lab / Buttonwillow Raceway Park

STU pace at Buttonwillow Raceway Park

STUsolid race · dashed qualifying · slower is lower

	Event	STU
	Event	Qual best	Race best	Trap
	Cal Club 2026 CALCL262026-02-21	1:50.913Tony Rivera · 6 cars-4.488s (-3.89%)	1:52.737Tony Rivera · 7 cars-0.903s (-0.79%)	135.2Tony Rivera+21.8 mph (+19.3%)
17 rule changes (STU: 17)8 weight · 3 induction · 2 engine · 2 tyres & wheels · 1 cars added · 1 wordingshowhide 2026-01-01 Request for Permission on Aftermarket Turbo Kit and Intake #39529induction 2025-12-01 Turbo Inlet Restrictor Table #38961induction 2025-12-01 275 Tire Rule #38983tyres & wheels 2025-12-01 STU Honda Engine weight penalty #39375weight 2025-11-01 Non-Homologated Engine Swaps - Specifically K24A2 w/ Honda CRZ #38746weight 2025-09-01 Lotus Weight Reduction E&O #38919weight 2025-08-01 STU-TCR Adjustments #38723weight 2025-08-01 Lotus Weight Reduction #38772weight -50 lbs 2025-07-01 2.8-3.2L N/A Engine Allowances #38007engine 2025-07-01 2006-2015 Mazda Miata Intake Manifold #38422induction 2025-07-01 Requesting Approval of the JDM Honda h23a #38489cars added 2025-05-01 Wheel Size Inconsistency #38018tyres & wheels 2025-05-01 Table C: STU-GT3U Clarification #38268weight 2025-03-01 BMW N54/N55 Engine Allowance Follow Up #37447engine 2025-03-01 STU Mini Cooper pulley size clarification re: letter #36980 #37717wording 2025-03-01 Question About a Weight Modifier #37782weight 2025-03-01 Increase Minimum Weight #37919weight +100 lbs
	Cal Club 2025 CALCL252025-02-22	1:55.401Wilson Powell · 4 cars	1:53.640Rylan Hazelton · 5 cars	113.3Rylan Hazelton
85 earlier rule changes on record, in force before Cal Club 2025 (from 2019)25 weight · 16 induction · 10 engine · 7 aero · 7 cars added · 6 tyres & wheels · 3 suspension & brakes · 2 wording · 9 othershowhide 2025-01-01 Audi 1.8t Wagon STU Table B #36685weight 2025-01-01 Merger GT3 to STU #37486other 2025-01-01 GT3 TCR Tire allowance #37494tyres & wheels 2024-12-01 Request to Remove Miata Hubs from General category #37138tyres & wheels 2024-12-01 BMW N54/N55 Engine Allowance #37146engine 2024-11-01 R53 15% Pulley Request #36980other 2024-08-01 RWD Turbo Disadvantage #36255induction 2024-03-01 Letter #35397 addendum #35453weight 2024-03-01 S54 Drysump #35464other 2024-02-01 ST Electric-Assisted Steering Systems #35066other 2023-07-01 2022 Toyota GR Cup for STU #34449cars added 2023-04-01 Alternate OEM Miata Intake Manifold #33827induction 2023-03-01 E&O STU NA Weight Chart. #33737weight 2022-08-01 Request Mazda 13 B turbo #32668induction 2022-08-01 Hood Vents and Intercooler Scoops #32733other 2022-08-01 Non 4 valve weight reduction removed #32808weight 2022-07-01 Error in new minimum weight table when combined with other text #32711weight 2022-07-01 Redundant Language in May GCR #32713engine 2022-05-01 Opposed to the Proposed STU Weight Chart #32381weight 2022-05-01 Clarification request for GCR 9.1.4.D.3.a Splitter Definition #32414aero 2022-04-01 Request Adjustment to Min Weight for STU BMW E36 M3 (95-99) #31535weight -90 lbs 2022-04-01 BMW E36 M3 Canadian (North American) S50B32 engine #31866engine 2022-04-01 Engine Swap Origin Country #32209engine 2022-04-01 CRX/Civic Del Sol #32214cars added 2022-04-01 Error correction #32383weight 2022-04-01 Single TB Weight Modifiers Add to Chart #32393weight 2022-03-01 Single TB Weight Modifiers #31449weight 2022-03-01 Request to Remove A4 1.8t from STU Spec Line Tables #31465weight 2022-03-01 Improved Touring Tires #32063tyres & wheels 2022-02-01 Request Allowance for Balance Shaft Delete in STU #31434engine 2022-02-01 Request Louvers in hood vents #31916other 2022-01-01 Request to Add Honda K23 Spec Line #30682cars added 2022-01-01 RE: Aug FT letter 30682 #31060other 2022-01-01 Throttling Device Clarification #31323induction 2021-07-01 STU Fender flares #30696tyres & wheels 2021-07-01 Request weight reduction for 12A bridgeport motor in Miata #30751weight -200 lbs 2021-05-01 Request for Fender Flare Clarification #30375weight 2021-04-01 Provision for Interchangeable Engine Components Already Allowed #30342engine 2021-04-01 ST Oil Coolers E&O Correction to 9.1.4.2.H #30388wording 2021-03-01 Super Touring Alternate Miata Hubs #30345tyres & wheels 2021-02-01 Brake Component Relocation #29990suspension & brakes 2021-02-01 Porsche PDK #30081weight 2021-02-01 Reference Letter #29333 Proposed STU 13B Spec Line Changes #30086weight 2021-02-01 Drive Shaft Request #30087other 2021-01-01 13B Rules Adjustment #29333cars added 2020-12-01 Request clarification on wing measurement #29640aero 2020-09-01 Request for Advanced Aero Rule Wording Clarification. #29124aero 2020-08-01 Minimum Weight Determination #27695weight 2020-08-01 ST Gurney flap Wicker clarification #29012aero 2020-07-01 Request for Alternate Intake Manifold #26514induction 2020-07-01 Request for Addition to GT3 Approved Turbo List #27576induction 2020-07-01 Request BoP for my Car #29004induction 2020-07-01 Sequential Shifters in STU #29031other 2020-06-01 Rotary Help #27833weight 2020-04-01 Request to approve Honda S2000 HKS supercharger #27281engine 2020-04-01 Request BoP on the Lotus #27637weight +100 lbs 2020-04-01 Turbo Inlet Restrictor On MK5 Volkswagen #27704induction 2020-04-01 Honda K20C1 removal #27732induction 2020-04-01 Change GM LNF 2.0 Allowance to LSJ Engine for Viable STL 2.0 #27884engine 2020-04-01 Alternate Engine for Porsche 944 #28259engine 2020-03-01 Please Modify the STU Wheel Size Rule for Clarity #27694weight 2020-03-01 Turbo Engine Cars Base Weight #28032weight 2019-12-01 Request for an electronic throttle body #27342induction 2019-08-31 Request to correct E&O advanced aerodynamics #27290aero 2019-07-01 Remove -2mm penalty from SR20DET Nissan #26982weight 2019-07-01 Request clarification for manifold and throttle in STU #27004induction 2019-05-31 Request to clarify afterrmarket side skirts exhaust exit #26814suspension & brakes 2019-05-31 Wheel Flare wording #26872tyres & wheels 2019-05-01 Request Ride Height Clarification #26597suspension & brakes 2019-04-01 Request to Use Japanese Mazda 13b Intake Manifold #25790induction 2019-04-01 Request Alternate Intake for Mazda MZR In a Rear Wheel Drive App. #26352induction 2019-04-01 E&O Suspension #26424wording 2019-04-01 Revisit B20 VTEC #26530cars added 2019-04-01 Move Flared Fenders to STU Advanced Aero #26564aero 2019-04-01 TCA Civic SI E&O #26606induction 2019-04-01 S54 Spec line #26620weight 2019-03-01 Request to Class Assignment for 2017 Civic #24287cars added 2019-03-01 Request to run E46 3246cc in STU #25126weight 2019-03-01 Engine Classification for Rotary #25564engine 2019-03-01 K24/K20 Head Swap Clarification/Amendment #25899induction 2019-03-01 Request to Classify 12a Bridge Ported Rotary Engine #25985cars added 2019-03-01 World Challenge Car Eligibility #26387weight 2019-03-01 Request a phone call for discussion regarding weight #26398weight 2019-03-01 Advanced Aero E&O #26413aero 2019-01-01 Request to Equalize Direct Injected Turbo Cars #24890induction

Best is the class's fastest lap in that event's qualifying or race sessions, with the driver who set it and how many cars set a time. 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.