BoP Lab / Buttonwillow Raceway Park

T1 pace at Buttonwillow Raceway Park

T1solid race · dashed qualifying · slower is lower

	Event	T1
	Event	Qual best	Race best	Trap
	Cal Club 2026 CALCL262026-02-21	1:59.760Ed Gless · 1 car+13.295s (+12.49%)	1:59.123Ed Gless · 1 car+11.689s (+10.88%)	120.7Ed Gless-18.6 mph (-13.3%)
13 rule changes (T1: 13)7 weight · 2 cars added · 1 induction · 1 removed · 2 othershowhide 2026-02-01 LS1 into Corvette C6 Spec Line Request #39716weight 2026-01-01 additional T1 adjustment #39520induction 2025-12-01 Keep S2000 Classification #39344other 2025-12-01 Correcting and updating T1 GT4 spec lines #39394weight 2025-12-01 BOP adjustments to non GT4 T1 cars #39406weight +100 lbs 2025-12-01 Remove T1 Spec Line #39407removed 2025-05-01 Acceptance of Porsche 981 GT4 Clubsport into T1 #36664cars added 2025-05-01 Request to Restore T1 Honda S2000 to Proper Weights #37644weight -50 lbs 2025-05-01 DCT Transmission in E46 #37964other 2025-05-01 Reduce E92 M3 Minimum Weight to 3050 #38092weight 2025-05-01 Finalize Spec Line for T1 Darkhorse #38106weight 2025-04-01 Cadillac CT4-V Blackwing #38003cars added 2025-03-01 Correct and make new T1 BOP adjustments. #37737weight +75 lbs
	Cal Club 2025 CALCL252025-02-22	1:46.465Ian Barberi · 2 cars	1:47.434Ian Barberi · 3 cars	139.3Drew Delmonico
105 earlier rule changes on record, in force before Cal Club 2025 (from 2019)24 cars added · 24 weight · 10 engine · 9 induction · 7 suspension & brakes · 7 tyres & wheels · 6 aero · 1 removed · 6 wording · 11 othershowhide 2025-02-01 T1 Parity Compared to GT4 #37170weight +125 lbs 2025-02-01 Clarification of Request Approval #37273 #37399engine 2025-02-01 C8 Corvette Facts #37400weight -100 lbs 2025-02-01 Camaro Gen 5 Competitive Disadvantage #37440induction 2025-02-01 Tire Changes in the Rules for GT4 #37497tyres & wheels 2024-12-01 Changes to T1 Tires for GT4 and Other Cars #35383tyres & wheels 2024-12-01 G82 M4 GT4 inclusion in T1 #35864cars added 2024-12-01 Alt. Clutch Allowance #36606engine 2024-12-01 BOP Changes Need Updates #36667weight -150 lbs 2024-12-01 Request Ford Performance Darkhorse R in T1 #37136cars added 2024-12-01 Car Mods for T1 Corvette under line item 1150 #37173tyres & wheels 2024-12-01 Increased Bore Throttle Bodies for E46 M3 S54 Engine #37273engine 2024-05-01 Please Expedite classing the C63 Mercedes #35987cars added 2024-04-01 Honda S2000 #35582cars added 2024-03-01 9.1.9.1 T1 new category item/ line 26 rule to expire Jan 1 2023 #35411cars added 2024-02-01 C8 Corvette T1 Restrictor Plate Request #35213induction 2024-02-01 The Cars Have Expired #35379induction 2024-01-01 GT4 batch adjustment in T1 #35162weight -85 lbs 2024-01-01 Remove T1 spec lines #35192other 2023-12-01 New T1 add spec line for C5 corvette LS2 engines (Copy from C6) #33764engine 2023-12-01 C7 Corvette Rule Change Request #34897cars added 2023-12-01 Camaro Gen 5 Weight Reduction Due to Competitive Disadvantage #35092weight -75 lbs 2023-12-01 Addendum to Letter #35022: Drivetrain Rule #35105other 2023-12-01 2004 - 2006 Pontiac GTO Re-Integration Back Into T1 #34403cars added 2023-12-01 Request to Classify Porsche 997-1 GT3 Cup #34561cars added 2023-08-01 Why no Camaro? #34421cars added 2023-08-01 Request to Remove Expiration from T1 spec lines #1350 & #1370 #34470other 2023-08-01 Remove #34475other 2023-08-01 Error in T1 GT4 numbering scheme- #34578wording 2023-08-01 C5 Approved Aero That Was Mistakenly Deleted #34374aero 2023-07-01 Viper Cleanup #34107induction 2023-07-01 Viper 8300 OEM FPR Size #34268induction 2023-07-01 Ford Mustang S197 (05-14) Clarification #34450wording 2023-07-01 Gen 5 Camaro Engine #33875engine 2023-07-01 Inquiry to letter #33682 #34071engine 2023-06-01 Request to reinstate T1 S197 Mustang #34048cars added 2023-05-01 T1 GT4 adjustments #33786other 2023-05-01 Touring 1 Tire Sizes #34191tyres & wheels 2023-04-01 Clarification for Camaro Gen5 2010-2015 #33739cars added 2023-03-01 Sequential Gearbox Limitations in T1 #33691weight 2023-03-01 T1 GT4 adjustments #33786weight 2023-03-01 Sunset of pre 2023 Touring 1 Rules. #33916removed 2023-02-01 Corrections to T1 Spec Lines #33678tyres & wheels 2023-01-01 GT4 section to Current T1 Rules. #33632weight 2022-08-01 Correct Camaro Spec Line From Letter #30791 response to 3475lbs #32824weight -25 lbs 2022-06-01 Fix FP350S limited prep and Shelby 350 full prep issues #31680induction 2022-06-01 Request to Classify AMG GT4 #32610cars added 2022-04-01 Viper/Z06 Parity #31942weight -50 lbs 2022-04-01 Discrepancy in T1 allowances #32293other 2022-04-01 T1 RX7 classification #32352cars added 2022-03-01 Weight reduction E&O #30791weight -25 lbs 2022-03-01 Performance Adjustment Request for Camaro #31521weight -50 lbs 2022-03-01 Remove 33m Brake rotor thickness rule #31954suspension & brakes 2021-12-01 Turbo Miata Help #31315weight +200 lbs 2021-12-01 Fix the T1 Corvette heading #31528wording 2021-08-01 T1 E46 BOP E&O for Letter # 29970 #30934weight +100 lbs 2021-07-01 Request BoP for the Viper in 1 LP #29968other 2021-07-01 LS6 Alternative Head Question #30074engine 2021-06-01 T1-LP - Add Performance Pack, Bullet, Mach 1 to 18+ Mustang #29849induction 2021-06-01 Request BoP for the Viper in 1 LP #29968other 2021-06-01 Request to classify C7 and 13Viper in T1 LP #29969cars added 2021-06-01 Request LP Z06 steel chassis #30589other 2021-05-01 Request For Reduction in Weight/Penalties for Camaro #30443weight 2021-05-01 Fix dry sump Contradictions in T1-LP vs T2 #30596suspension & brakes 2021-03-01 T1 LP Aero adjustments #30196aero 2021-02-01 Request to Clarify Miller Mustang Classification #28728engine 2021-02-01 BMW E46 Carbon Dash #29806engine 2021-02-01 Request to Update T1 Mustang Spec Line #30001other 2021-02-01 Dodge Viper 8400 OEM??? #30174cars added 2021-02-01 Class BMW M2CS Club Sport #30195cars added 2021-02-01 997.1 GT3 Cup #30229cars added 2021-01-01 Correct T1 Limited Prep Years #29708wording 2020-12-01 Changes to Corvette C8 #29898weight -100 lbs 2020-08-01 Touring Gurney flap wicker clarification #29013aero 2020-06-01 Consider coil spring conversion Corvette in T2 #28824suspension & brakes 2020-05-01 Additional Clarification on 996 Cup in T1 From Letter #28040 #28060wording 2020-05-01 Request SPEC Corvette Rear Spolier #28182aero 2020-05-01 T1 Rear Brake Rotor Size Exemption for Gen 5 Camaro #28402suspension & brakes 2020-04-01 Request 996 GT3 Trunk for Wing Allowance. #28153aero 2020-04-01 All Touring, Change DOT Tire Language 9.1.9.1, 9.3.45 #28452tyres & wheels 2020-03-01 Request for E46 wagon with S54 engine in T1 #27427engine 2020-02-01 Request to include Subaru WRX/STI 02-18 in T1 #24916induction 2020-02-01 Request Ford Mustang FP350S T1-LP weight and restrictor change #26662weight +100 lbs 2020-02-01 Request to classify Ford Coyote 3rd Gen OEM #27145cars added 2020-02-01 Request alternate dashboard #27276weight 2020-02-01 Request for Allowance of Coil Springs on Limited Prep C6 Corvette #27713suspension & brakes 2019-08-31 T1 LP 2016 Camaro and Later #27198weight -100 lbs 2019-08-01 Request to return Ford Mustang Challenge Car to T1 #26751cars added 2019-08-01 Correct years in T1 FP Corvette spec #27023wording 2019-07-01 Request BoP Baten - T1 Camaro - Follow up to Letter # 26145 #26900induction 2019-05-31 Clarify DOT tires touring #26556tyres & wheels 2019-05-01 Request to Classify EcoBoost Mustang #25841cars added 2019-05-01 Request Corvette aerodynamic aids #26265aero 2019-05-01 Audi TTRS VTS Documentation Revision #26578other 2019-05-01 Request Ride Height Clarification #26599suspension & brakes 2019-05-01 Opposes Unfair weight and throttle restrictor #26719weight -300 lbs 2019-04-01 Request to classify the Porsche 928GTS/S4 in Touring 1 #26315cars added 2019-03-01 Request Mustang GT Limited Prep 2018 Classification #24431cars added 2019-01-01 Class 2015+ Mustang GT350(R) #21466weight 2019-01-01 Request to Classify Ford FP350S in T1-LP #25341cars added 2019-01-01 Amendment to Request #25555 #25556suspension & brakes 2019-01-01 Request to balance 996 v 997 T1 weight #25658weight 2019-01-01 Request to Add PDK Transmission to 997 Porsche Spec Line #25668cars added 2019-01-01 T1 World Challenge/Grand AM Spec Cars #25687weight 2019-01-01 Add Clarification to Spec Car Classifications Vehicle Spec #25774weight

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.