BoP Lab / Buttonwillow Raceway Park

FV vs P vs SMX pace at Buttonwillow Raceway Park

Quickest here: FV 1:58.898 Mace Gjerman, Cal Club 2026 race · P 1:32.872 Jim Devenport, Cal Club 2025 qualifying · SMX 1:56.431 Ethan Lampe, Cal Club 2025 qualifying

Lap times% of FV

FVPSMXsolid race · dashed qualifying · slower is lower

FVPSMXsolid race · dashed qualifying · each class's best lap as a share of FV's at the same event (the reference class, changeable above); 100% is level, higher is quicker

	Event	FV			P					SMX
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs FV	% of FV	Qual best	Race best	Trap	vs FV	% of FV
	Cal Club 2026 CALCL262026-02-21	2:02.562Gavin Sweeney · fastest of 7 · top 5 within 3.3s+0.208s (+0.17%)	1:58.898Mace Gjerman · fastest of 7 · top 5 within 6.0s-2.299s (-1.90%)	124.6Gavin Sweeney+21.2 mph (+20.5%)	1:38.716Kevin Mitz · fastest of 3 · top 3 within 3.1s+5.844s (+6.29%)	1:37.287John Manfroy · fastest of 3 · top 3 within 3.5s+3.315s (+3.53%)	160.4John Manfroy+18.7 mph (+13.2%)	-21.611squal -23.846s	81.8%qual 80.5%	1:56.503Lincoln Larson · fastest of 15 · top 5 within 0.7s+0.072s (+0.06%)	1:57.973William Wallis · fastest of 15 · top 5 within 0.8s+0.556s (+0.47%)	141.6Joey Andrews+28.0 mph (+24.6%)	-0.925squal -6.059s	99.2%qual 95.1%
10 rule changes (P: 6, SMX: 4)1 cars added · 1 engine · 1 induction · 1 suspension & brakes · 6 wording · Prototype carbon-carbon and carbon-ceramic brake rotors now permitted instead of prohibited. · P class 13B rotary engine restrictor changes to 40mm SIR fuel injection or 41.5mm venturi carburetor. · Prototype class adds Radical SR3 spec line to Table 1 effective 9/1/25. · Prototype P2 cars may now run P2 spec or modified Prototype spec in Prototype class; clarified language and added Radical Cup series table. · Prototype Engine Table A 2-cycle restrictor reduces from 40mm to 38mm venturi size. · SMX drivers must submit data acquisition files on time or face suspension and $250 fine. · SMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fine; level 2 and 4 may carry $500 fine. · Class P adds clarification notes on restrictor requirements, throttle bodies, Mazda 12A engine spec, and P2 auto-based engine rules. · SMX Toyo RR P235/40/ZR17 tire rules clarified: one set per weekend, marking after first session, damage replacement procedures revised. · SMX data submission deadline extended from 30 to 60 minutes after each timed session.showhide 2026-01-01 P Request to Continue to Allow Carbon Brakes #39476suspension & brakessuspension & brakesPrototype carbon-carbon and carbon-ceramic brake rotors now permitted instead of prohibited. 2025-09-01 P 13B Rotary Engine Rules Change Request #38856engineunclearP class 13B rotary engine restrictor changes to 40mm SIR fuel injection or 41.5mm venturi carburetor. 2025-09-01 P Add Radical Cup series Radical SR3 spec line to Table 1 #38916cars addedcars addedPrototype class adds Radical SR3 spec line to Table 1 effective 9/1/25. 2025-09-01 P Clarify spec line cars language #38943wordingwordingPrototype P2 cars may now run P2 spec or modified Prototype spec in Prototype class; clarified language and added Radical Cup series table. 2025-08-01 P RM 25-05 - Prototype Engine Table A, 2 Cycle Restrictor Change #38929inductionslowerPrototype Engine Table A 2-cycle restrictor reduces from 40mm to 38mm venturi size. 2025-06-01 SMX SMX Data Submission - Penalties #38248wordingwordingSMX drivers must submit data acquisition files on time or face suspension and $250 fine. 2025-06-01 SMX Committee) SMX Penaly Clarification updated language #38337wordingwordingSMX penalty language clarified: level 1 and 3 infractions may carry $1,000 fine; level 2 and 4 may carry $500 fine. 2025-05-01 P Add missing punctuation marks #38150wordingwordingClass P adds clarification notes on restrictor requirements, throttle bodies, Mazda 12A engine spec, and P2 auto-based engine rules. 2025-05-01 SMX Clarify Tire Marking Regs #38004wordingwordingSMX Toyo RR P235/40/ZR17 tire rules clarified: one set per weekend, marking after first session, damage replacement procedures revised. 2025-05-01 SMX SMX Data Submission Timeframe #38039wordingwordingSMX data submission deadline extended from 30 to 60 minutes after each timed session.
	Cal Club 2025 CALCL252025-02-22	2:02.354Gavin Sweeney · fastest of 5 · top 5 within 10.3s	2:01.197Gavin Sweeney · fastest of 5 · top 5 within 9.6s	103.5Gavin Sweeney	1:32.872Jim Devenport · fastest of 3 · top 3 within 8.1s	1:33.972Jim Devenport · fastest of 3 · top 3 within 7.7s	141.7Jim Devenport	-27.225squal -29.482s	77.5%qual 75.9%	1:56.431Ethan Lampe · fastest of 15 · top 5 within 1.5s	1:57.417Ethan Lampe · fastest of 15 · top 5 within 1.6s	113.6Ryan Gutile	-3.780squal -5.923s	96.9%qual 95.2%
25 earlier rule changes on record, in force before Cal Club 2025 (from 2019)5 tyres & wheels · 1 aero · 1 suspension & brakes · 1 weight · 17 wording · Prototype Staudacher and unrestricted engine notes corrected for minimum weight wording. · Prototype class renamed from P1 to P, affecting designation throughout rules with no performance changes. · SMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted. · FV ferrous rotor no longer required to be smooth; may have up to three pad cleaning grooves per side. · SMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification. · SMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance. · SMX Mazda Miata OE versus OEM definitions clarified in GCR Section 9.1.7.1. · SM and SMX shifter bushing rules clarified: alternate bushing at shift lever bottom now allowed. · FV front wheel bearings wording clarified in GCR 9.1.1.C.10.G. · FV connecting rod rules add Brian Crower part #BC6417 and Newland Group #4M113077 as allowed replacements. · FV connecting rods minimum weight 425.0 grams, center-to-center length 130 ± 0.10/-0.25 mm specified. · FV connecting rod suppliers clarified: Crower SP93280B and BrianCrower BC6417 allowed as direct replacements. · FV allows Crower SP93280B and Brian Crower Racing Rods as direct replacement connecting rods, must meet OEM minimum weight. · FV now allows 4 bolt wheels, previously restricted to 5 bolt wheels. · FV now supports 4-bolt pattern wheels in addition to existing wheel specifications. · FV rain tire requirement changed to Hoosier #44266 22.5 x 5.0 x 15 WET or W3. · FV allows non-spec Hoosier tires in Regional races until 2020-01-01, when spec tires become required. · FV allows rear tires on front of car; mandates Hoosier #43337 fronts and #43353 rears, plus #44266 rain tire from 2020-01-01. · FV wheels clarified: 15" x 4J standard or 15" x 4.5J steel VW, 5-bolt pattern, same track dimensions. · FV exhaust outlet location tightened to 1–4 inches behind rearmost body part. · FV wheels now permit 15-inch 4.5J steel wheels within C.2 track dimensions, adding to standard 4J options. · FV exhaust opening can now extend to 4 inches behind body rear, previously 3 inches maximum. · FV front track maximum 52.500" and rear track 49.125"-50.750" no longer prohibits spacers. · FV disc brake assembly minimum weight clarified to 16.5 lbs total; caliper minimum weight requirement removed. · FV intake manifold horizontal tube measurement locations clarified between 1.500" and 8.000" on short side.showhide 2025-02-01 P Correct text in engine table notes #37606wordingwordingPrototype Staudacher and unrestricted engine notes corrected for minimum weight wording. 2025-02-01 P Update Prototype class designation #37653wordingwordingPrototype class renamed from P1 to P, affecting designation throughout rules with no performance changes. 2024-12-01 SMX E&O SMX Regs 9.1.7.1.D.5.u-.w #37070wordingwordingSMX allows OE instrument cluster relocation for aftermarket dash mounting, with wiring re-routed only; alternate gauges now permitted. 2024-10-01 FV Disc Brakes #36822suspension & brakessuspension & brakesFV ferrous rotor no longer required to be smooth; may have up to three pad cleaning grooves per side. 2024-09-01 SMX SMX Camera Rule Correction #36496wordingwordingSMX Spec MX-5 camera requirement wording changed; non-functioning recorder now grounds for penalty or disqualification. 2024-09-01 SMX Committee) AIM ECU Protocol #36556wordingwordingSMX Spec MX-5 must run latest AIM Data Logger Spec MX-5 ECU Protocol; wording clarification for technical compliance. 2024-09-01 SMX Committee) OE versus OEM Definitons #36608wordingwordingSMX Mazda Miata OE versus OEM definitions clarified in GCR Section 9.1.7.1. 2024-09-01 SMX Committee) Shifter Bushing #36611wordingwordingSM and SMX shifter bushing rules clarified: alternate bushing at shift lever bottom now allowed. 2023-12-01 FV FV Wheel Bearing Clarification #35150wordingwordingFV front wheel bearings wording clarified in GCR 9.1.1.C.10.G. 2022-03-01 FV Connecting Rod Update Request for 9.1.1.C Formula Vee (FV) 5.C.6 #32160wordingwordingFV connecting rod rules add Brian Crower part #BC6417 and Newland Group #4M113077 as allowed replacements. 2022-03-01 FV E&O clarification of connecting rod center-to-center length #32183wordingwordingFV connecting rods minimum weight 425.0 grams, center-to-center length 130 ± 0.10/-0.25 mm specified. 2022-01-01 FV Update direct replacement connecting rod information #31843wordingwordingFV connecting rod suppliers clarified: Crower SP93280B and BrianCrower BC6417 allowed as direct replacements. 2021-12-01 FV Formula V Connecting Rod Replacement #31448wordingwordingFV allows Crower SP93280B and Brian Crower Racing Rods as direct replacement connecting rods, must meet OEM minimum weight. 2020-07-01 FV Support for Recommended Item - 4 bolt wheels in FV #29084tyres & wheelstyres & wheelsFV now allows 4 bolt wheels, previously restricted to 5 bolt wheels. 2020-07-01 FV Support for 4-bolt pattern wheels #28955 #29118wordingwordingFV now supports 4-bolt pattern wheels in addition to existing wheel specifications. 2020-03-01 FV Update rain tire designation #28444tyres & wheelstyres & wheelsFV rain tire requirement changed to Hoosier #44266 22.5 x 5.0 x 15 WET or W3. 2020-01-01 FV FV Allow non-spec tire in Regional competition #26284tyres & wheelstyres & wheelsFV allows non-spec Hoosier tires in Regional races until 2020-01-01, when spec tires become required. 2020-01-01 FV Request to Allow Rear Tires on the Front of Formula Vee #26537tyres & wheelstyres & wheelsFV allows rear tires on front of car; mandates Hoosier #43337 fronts and #43353 rears, plus #44266 rain tire from 2020-01-01. 2019-12-01 FV Clarification on Wheel Bolt Pattern #27603wordingwordingFV wheels clarified: 15" x 4J standard or 15" x 4.5J steel VW, 5-bolt pattern, same track dimensions. 2019-10-01 FV Allowed Modifications E&O #27398wordingwordingFV exhaust outlet location tightened to 1–4 inches behind rearmost body part. 2019-08-31 FV E&O Wheels #27230tyres & wheelstyres & wheelsFV wheels now permit 15-inch 4.5J steel wheels within C.2 track dimensions, adding to standard 4J options. 2019-05-31 FV Exhaust termination rule E&O #26702aeroaeroFV exhaust opening can now extend to 4 inches behind body rear, previously 3 inches maximum. 2019-05-01 FV E&O Dimensions #26674wordingwordingFV front track maximum 52.500" and rear track 49.125"-50.750" no longer prohibits spacers. 2019-04-01 FV Request to clarify Disc Brake rules bearing retainer & weights #26262weightslowerFV disc brake assembly minimum weight clarified to 16.5 lbs total; caliper minimum weight requirement removed. 2019-02-01 FV FV Intake Manifold Clarification #26008wordingwordingFV intake manifold horizontal tube measurement locations clarified between 1.500" and 8.000" on short side.

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 FV" is the class's best as a share of FV'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 FV'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.