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BoP Lab / Buttonwillow Raceway Park

FE vs FB vs FM vs EP pace at Buttonwillow Raceway Park

FE at every track →

Lap times across years say as much about the weather as the class. % of FE is each class's best lap as a share of FE'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.

Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
Reference · what % is measured against
Track configuration

Quickest here: EP 1:53.088 Glen McCready, Super Tour Feb 2025 qualifying

1:531:541:551:561:571:58114 rule changes between Super Tour Apr 2019 and Super Tour Feb 2025114 ▾26 rule changes between Super Tour Feb 2025 and Super Tour Feb 202626 ▾EP race best at Super Tour Feb 2025: 1:53.487 (Glen McCready)EP race best at Super Tour Feb 2026: 1:57.999 (Kurt Frietzsche)EP qualifying best at Super Tour Feb 2025: 1:53.088 (Glen McCready)EP qualifying best at Super Tour Feb 2026: 1:57.474 (Kurt Frietzsche)Super Tour Apr 2019Super Tour Apr2019Super Tour Feb 2025Super Tour Feb2025Super Tour Feb 2026Super Tour Feb2026
FEFBFMEPsolid race · dashed qualifying · slower is lower
EventFEFBFMEP
Qual best Race best Trap Qual best Race best Trap vs FE % of FE Qual best Race best Trap vs FE % of FE Qual best Race best Trap vs FE % of FE 
Super Tour Feb 2026 CALCL262026-02-211:57.474Kurt Frietzsche · fastest of 4 · top 4 within 4.5s+4.386s (+3.88%)1:57.999Kurt Frietzsche · fastest of 4 · top 4 within 4.9s+4.512s (+3.98%)131.6Joe Carr+23.8 mph (+22.1%)
26 rule changes (FE: 3, EP: 23)11 weight · 5 induction · 3 engine · 1 cars added · 1 suspension & brakes · 1 tyres & wheels · 2 wording · 2 othershowhide
  • EP Request to Update E30 BMW Throttle Body Diameter Verbiage #39363induction
  • FE FE & FE2 Rule Updates #39484engine
  • EP TR2 Notes E&O #39180weight
  • EP Balance of Power #39187weight +50 lbs
  • EP Please Lower Weight of 280Z #38871weight -160 lbs
  • EP Miata Weight Adjustment Follow Up #38949weight -25 lbs
  • EP Weight Break for 1098 Midget / Sprite #38970weight -80 lbs
  • EP HP Volvo 142 spec omission #38994engine
  • EP HP Mini DOHC 1.6 #38996engine
  • EP Add to Rabbit description #39019wording
  • EP Clean-up 9.1.5.E.7e #39025suspension & brakes
  • EP Add TB size to Ford Mustang (94-98) Spec Line #39130induction
  • EP HP Plymouth Arrow spec omission #38995wording
  • EP Add Wheel Diameter to Appendix G #39008tyres & wheels
  • EP Add TB ID tolerance to general Prod rules #39009induction
  • FE FE & FE2 Bubble Tail #38978other
  • FE FE & FE2 Rule Updates #38901weight
  • EP BMW Z4 update #38490induction
  • EP EP Fiat 124 Spider Competition Adjustment Request #38498weight -50 lbs
  • EP Base Weight Adjustment for H-Production X1/9 Spec Lines #38255weight -50 lbs
  • EP Request for Classification of Chevrolet Spark #37755cars added
  • EP Request to Lower Ford Festiva Minimum Weight to 1600 LBS #37939weight -100 lbs
  • EP Request Competition Adjustment to BMW Z3 2.5L #37120induction
  • EP Interpretation of Production Rules on Mirrors #37235other
  • EP Weight Reduction for Honda S2000 #37466weight
  • EP Mazda 1999 Miata 1.8L #37488weight -50 lbs
Super Tour Feb 2025 CALCL252025-02-221:53.088Glen McCready · fastest of 5 · top 5 within 10.6s1:53.487Glen McCready · fastest of 5 · top 5 within 10.6s107.8Joe Carr
114 rule changes (FE: 26, EP: 88)21 weight · 19 induction · 18 engine · 11 cars added · 11 suspension & brakes · 9 tyres & wheels · 3 aero · 8 wording · 14 othershowhide
  • EP Effective date for Jan 2025 GCR updates #37654induction
  • EP Request to Reduce Weight of BMW 325i/is E30 (84-91) Spec Line #37119weight -50 lbs
  • EP Triumph GT6 Adjustments #37112weight
  • FE Brake Line to A-Arm Covers #37110suspension & brakes
  • EP 1275 HP Spridget Level 2 Only #36518other
  • EP NA Miata Track Width Correction #36902wording
  • FE Protest Fee Clarification #36540wording
  • FE Update on Letter 36620 with new Hoosier Contingency Decal Info #36625tyres & wheels
  • EP Errant entry in HP production line item #36231other
  • FE Hoosier Tire Decal Placement #36435tyres & wheels
  • EP NIssan 300ZX Z31 to EP #35830cars added
  • EP RX7 1993 and Up Request In EP Spec Lines, classify #36031cars added
  • EP Clean-up Multiple EP RX-8 Spec Lines In EP #36156wording
  • EP GCR Correction - Redundant HP Spec Lines #35623engine
  • EP Update 1988-1991 Civic to Match 1988-1991 CRX #35399weight
  • EP Request to Review Z3 2.5 Spec Line #35073weight +50 lbs
  • EP Miata Alternate Head #35253weight -50 lbs
  • EP Triumph GT6 Adjustments #35255weight
  • EP Honda S2000 throttle body #35272induction
  • EP Correction within Triumph TR8 Spec Line #35315engine
  • EP Correction to EP 924S/944 Spec Line #35317weight
  • FE Update FE Rain Light Rule #34707other
  • FE FE/FE2 rule update #35269other
  • EP Porsche 944/924S Rule Change Request #35002weight
  • EP Triumph GT6 Adjustments #35054weight -30 lbs
  • EP Hub Note Clean Up In EP TR8 Spec Line #34649wording
  • EP Triumph GT6 Adjustments #34662other
  • EP Triumph GT6 Adjustments: Brakes #34663suspension & brakes
  • EP Correct Intake Valve Size on 1500cc Midget/Spitfire #34419induction
  • EP 914-6 Valve Size Correction #34185engine
  • EP Investigate Parity of Z3 #33343induction
  • FE Update FE SADEV Transmission Rule #33883other
  • EP Revise 79-85 RX7 Brake Spec Line Allowance #33293suspension & brakes
  • EP Request alternate carburetors for EP 280z #33405engine
  • EP Fuel Injection 12a Mazda RX3 #33434engine
  • EP Mazda RX3 - Weight Reduction #33436weight -50 lbs
  • EP Request TR8 Dry Sump Allowance #33460other
  • EP Review Limited Prep Port Matching Rules #33600induction
  • EP 280ZX Classification Request #33611weight
  • FE Brake bias adjuster clarification #33084suspension & brakes
  • FE FE Front and Rear Wing Update & Clarification #33089aero
  • EP Request to classify VW New Beetle 2.5L in EP #32725cars added
  • EP Request Rotary Injection on Dual Y manifold #32775engine
  • EP Request for Corrado Stroke & Displacement Correction #32985engine
  • FE Engine Heat Shield & Insulation #33019engine
  • EP Subaru BRZ Model Years #32500other
  • FE Update FE/FE2 Tire Rule #32613tyres & wheels
  • FE Master cylinder clarification #32669engine
  • EP EP MX-5 Global Cup Car #32218weight
  • EP Please Class BMW 128i in EP #32370cars added
  • EP Inconsistency in Body Work Descriptions #32396other
  • EP Mazda RX8 with 13b Rotary #32170induction
  • EP Request Idle control valve clarification #32178engine
  • EP EP Adjustments #31858induction
  • EP 1999 3.8L Ford Mustang to EP? #31635weight
  • EP Improved Touring Tires #32064tyres & wheels
  • EP Throttle Body and Idle Air #31800induction
  • EP Porsche 968 Engine Questions #31831engine
  • EP Request weight reduction for 1979-1985 Mazda RX-7 #31833weight
  • EP Porsche 968 Engine Questions #31478induction
  • EP PCS E. 2. n. 4. Add Axle Shaft to Allow FWD the Same Freedom #31592tyres & wheels
  • EP BMW Z3 2.5L Spec Line #31724induction
  • EP 944S2 Restrictor #31396induction
  • EP Classing Clarification for 1986 Toyota Corolla FX16 #31527cars added
  • FE Two FE2 Rule Updates #31524other
  • EP E&O; MR2 Track #31120wording
  • EP Request to Allow F22c Engine for 2000-2003 Honda S2000 #30548engine
  • EP Request a review of the S14 240SX in EP. #30873weight -200 lbs
  • EP Lotus/Caterham 7 America Request #30392engine
  • EP Reclassify Daimler SP 250 #30721cars added
  • FE FE Tire Rule Changes #30754tyres & wheels
  • FE Radiator Screens Clarification #30792wording
  • EP Clarify Application of Percentage Based Weight Penalties #30669weight
  • FE FE Radiator Screens #30575other
  • EP Change Classification of 84-87 Mazda 626 from FP to HP #30350cars added
  • EP Fiat X1/9 brake rotors #30423suspension & brakes
  • EP NC MX-5 year range correction E&O #30503wording
  • EP Please Classify Mazda3 in FP #30165cars added
  • EP Alternate Front Brake Rotors and Calipers for EP AH 3000 #29893suspension & brakes
  • EP Mk2 VW Consistency and Cleanup of FP and HP Spec Lines #29195weight -50 lbs
  • EP Correct Wording for Level 1 and Level 2 Induction Systems #29406induction
  • EP Weight Reduction for Datsun Roadster #29409weight -75 lbs
  • EP EP TR8 Adjustment #29512weight -100 lbs
  • FE FE / FE2 Spring Updates #29689suspension & brakes
  • EP 84-87 Toyota Corolla HP Wheel Diameter Allowance Proposal E&O #29458tyres & wheels
  • FE FE Gurney Flap Spec Update #29445aero
  • EP EP BMW Z3 Rule Clarification #28998engine
  • EP Request to Classify Porsche 911 2.0L #28456cars added
  • EP BMW Cylinder Head Casting and Part Numbers #28708engine
  • FE FE Gurney flap wicker clarification #28885aero
  • EP Request to Classify 1990-1994 Mazda Protege #28381cars added
  • EP Error in Mini Cooper Spec Line #28713wording
  • FE FE spring rule update changed to November 1, 2020 #28814suspension & brakes
  • EP Caterham 7 Spec Line #28498engine
  • EP Request to Review Horsepower Parity #27662induction
  • EP E36 (92-95) Brakes Errors and Omissions #28058suspension & brakes
  • EP Request to allow 40 DCOE carb for the Datsun 510 #28195induction
  • EP Add Throttle Body Size these EP BMW Spec Lines #28422induction
  • EP Request for Help for Datsun 1200 #27934induction
  • EP Request to List Mazda Miata Throttle Body Size #27907induction
  • FE Request for FE / FE2 preparation rules update #27722weight
  • EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661engine
  • FE FE / FE2 Update Rules #27624weight
  • FE FE Wet Tire E&O #27365tyres & wheels
  • EP Request bodywork for Austin Healey Bugeye Sprite MK1 #27106other
  • EP Request to classify the GMX5 2019 #27263cars added
  • EP level one susp. component rule #27270suspension & brakes
  • EP Clarification of Carb Rules - Prep 1 #27300induction
  • EP Clarification of Carb Rules - Prep 2 #27301induction
  • EP Request Miata Eligibility - 2003 #27121other
  • FE FE Tire Update #27029tyres & wheels
  • FE FE Anti-Roll Bar Clarification #26912suspension & brakes
  • FE FE / FE2 Updated Bubble Tail Rule #26913other
  • EP Allow Firewall Modification for Fitment of 13B into RX8 #26726engine
Super Tour Apr 2019 ST19APR262019-04-26
4 earlier rule changes on record, in force before Super Tour Apr 2019 (from 2019)2 tyres & wheels · 1 weight · 1 wordingshowhide
  • EP Rollcenter Correction Clarification #25873tyres & wheels
  • EP Hardtops #26476wording
  • EP Request for Competition Adjustment for 2nd Generation RX7 #25935weight -50 lbs
  • FE Request to Update Hoosier Rain Tire Part Number for the FE cars #26235tyres & wheels
About this data
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 FE" is the class's best as a share of FE'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 FE'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.