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BoP Lab / Buttonwillow Raceway Park

FE2 vs FV pace at Buttonwillow Raceway Park

Class · click a class to switch, + to compare alongside (up to 4)
AS+B Spec+B-Spec+EP+F6+FA+FC+FE2×FF+FP+vsFV×GT1+GT2+GT3+GT3U+GTL+GTX+HP+P+P1+P2+SM+SMX+SRF3+STL+STU+T1+T2+T3+T4+
Reference class · the others' laps as a share of this one's at the same event, so years compare despite weather; + a class above to measure against it
Track configuration

Quickest here: FE2 1:39.265 Jon McClintock, Cal Club 2026 qualifying · FV 1:58.898 Mace Gjerman, Cal Club 2026 race

1:401:451:501:552:002:052 rule changes between Cal Club 2025 and Cal Club 20262 ▾FE2 race best at Cal Club 2025: 1:39.712 (Paul Marino)FE2 race best at Cal Club 2026: 1:40.253 (Jon McClintock)FE2 qualifying best at Cal Club 2025: 1:39.358 (Paul Marino)FE2 qualifying best at Cal Club 2026: 1:39.265 (Jon McClintock)FV race best at Cal Club 2025: 2:01.197 (Gavin Sweeney)FV race best at Cal Club 2026: 1:58.898 (Mace Gjerman)FV qualifying best at Cal Club 2025: 2:02.354 (Gavin Sweeney)FV qualifying best at Cal Club 2026: 2:02.562 (Gavin Sweeney)Cal Club 20252025Cal Club 20262026
FE2FVsolid race · dashed qualifying · slower is lower
98%100%102%104%106%108%110%112%114%116%118%120%122%124%126%2 rule changes between Cal Club 2025 and Cal Club 20262 ▾FE2 race best at Cal Club 2025: 100.0% of FE2's (Paul Marino)FE2 race best at Cal Club 2026: 100.0% of FE2's (Jon McClintock)FE2 qualifying best at Cal Club 2025: 100.0% of FE2's (Paul Marino)FE2 qualifying best at Cal Club 2026: 100.0% of FE2's (Jon McClintock)FV race best at Cal Club 2025: 121.5% of FE2's (Gavin Sweeney)FV race best at Cal Club 2026: 118.6% of FE2's (Mace Gjerman)FV qualifying best at Cal Club 2025: 123.1% of FE2's (Gavin Sweeney)FV qualifying best at Cal Club 2026: 123.5% of FE2's (Gavin Sweeney)Cal Club 20252025Cal Club 20262026
FE2FVsolid race · dashed qualifying · each class's best lap as a share of FE2's at the same event (the reference class, changeable above); 100% is level, higher is quicker
EventFE2FV
Qual bestRace bestTrapQual bestRace bestTrapvs FE2% of FE2
Cal Club 2026 CALCL262026-02-211:39.265Jon McClintock · fastest of 3 · top 3 within 1.5s-0.093s (-0.09%)1:40.253Jon McClintock · fastest of 3 · top 3 within 2.2s+0.541s (+0.54%)156.6Paul Marino+29.4 mph (+23.1%)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%)+18.645squal +23.297s118.6%qual 123.5%
2 rule changes (FE2: 2)2 wording · FE and FE2 Enterprises must use bubble tail P/N WM138014; FE2 allows only this configuration. · FE2 allows driver safety and comfort modifications for disabled drivers with SCCA approval, not transferable to other drivers.showhide
  • FE2 FE & FE2 Bubble Tail #38978wordingneutralFE and FE2 Enterprises must use bubble tail P/N WM138014; FE2 allows only this configuration.
  • FE2 Driver Safety & Comfort #37965wordingneutralFE2 allows driver safety and comfort modifications for disabled drivers with SCCA approval, not transferable to other drivers.
Cal Club 2025 CALCL252025-02-221:39.358Paul Marino · fastest of 4 · top 4 within 1.5s1:39.712Paul Marino · fastest of 4 · top 4 within 1.7s127.2Tom Hope2:02.354Gavin Sweeney · fastest of 5 · top 5 within 10.3s2:01.197Gavin Sweeney · fastest of 5 · top 5 within 9.6s103.5Gavin Sweeney+21.485squal +22.996s121.5%qual 123.1%
20 earlier rule changes on record, in force before Cal Club 2025 (from 2019)5 tyres & wheels · 2 weight · 1 aero · 1 suspension & brakes · 11 wording · FV ferrous rotor no longer required to be smooth; may have up to three pad cleaning grooves per side. · 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. · FE2 oil cooler wording clarified: optional air-to-oil cooler allowed, Setrab 50-625-7612 or equivalent max 13 inches wide by 6.5 inches high. · 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. · FE and FE2 minimum weight increased to 1270 lbs including driver; spring options and tire warmer ban added. · 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
  • FV Disc Brakes #36822suspension & brakesneutralFV ferrous rotor no longer required to be smooth; may have up to three pad cleaning grooves per side.
  • FV FV Wheel Bearing Clarification #35150wordingneutralFV front wheel bearings wording clarified in GCR 9.1.1.C.10.G.
  • FV Connecting Rod Update Request for 9.1.1.C Formula Vee (FV) 5.C.6 #32160wordingneutralFV connecting rod rules add Brian Crower part #BC6417 and Newland Group #4M113077 as allowed replacements.
  • FV E&O clarification of connecting rod center-to-center length #32183wordingneutralFV connecting rods minimum weight 425.0 grams, center-to-center length 130 ± 0.10/-0.25 mm specified.
  • FV Update direct replacement connecting rod information #31843wordingneutralFV connecting rod suppliers clarified: Crower SP93280B and BrianCrower BC6417 allowed as direct replacements.
  • FV Formula V Connecting Rod Replacement #31448wordingneutralFV allows Crower SP93280B and Brian Crower Racing Rods as direct replacement connecting rods, must meet OEM minimum weight.
  • FE2 FE/FE2 Oil Cooler #29293wordingneutralFE2 oil cooler wording clarified: optional air-to-oil cooler allowed, Setrab 50-625-7612 or equivalent max 13 inches wide by 6.5 inches high.
  • FV Support for Recommended Item - 4 bolt wheels in FV #29084tyres & wheelsneutralFV now allows 4 bolt wheels, previously restricted to 5 bolt wheels.
  • FV Support for 4-bolt pattern wheels #28955 #29118wordingneutralFV now supports 4-bolt pattern wheels in addition to existing wheel specifications.
  • FV Update rain tire designation #28444tyres & wheelsneutralFV rain tire requirement changed to Hoosier #44266 22.5 x 5.0 x 15 WET or W3.
  • FV FV Allow non-spec tire in Regional competition #26284tyres & wheelsneutralFV allows non-spec Hoosier tires in Regional races until 2020-01-01, when spec tires become required.
  • FV Request to Allow Rear Tires on the Front of Formula Vee #26537tyres & wheelsneutralFV allows rear tires on front of car; mandates Hoosier #43337 fronts and #43353 rears, plus #44266 rain tire from 2020-01-01.
  • FE2 FE / FE2 Update Rules #27624weightslowerFE and FE2 minimum weight increased to 1270 lbs including driver; spring options and tire warmer ban added.
  • FV Clarification on Wheel Bolt Pattern #27603wordingneutralFV wheels clarified: 15" x 4J standard or 15" x 4.5J steel VW, 5-bolt pattern, same track dimensions.
  • FV Allowed Modifications E&O #27398wordingneutralFV exhaust outlet location tightened to 1–4 inches behind rearmost body part.
  • FV E&O Wheels #27230tyres & wheelsneutralFV wheels now permit 15-inch 4.5J steel wheels within C.2 track dimensions, adding to standard 4J options.
  • FV Exhaust termination rule E&O #26702aeroneutralFV exhaust opening can now extend to 4 inches behind body rear, previously 3 inches maximum.
  • FV E&O Dimensions #26674wordingneutralFV front track maximum 52.500" and rear track 49.125"-50.750" no longer prohibits spacers.
  • 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.
  • FV FV Intake Manifold Clarification #26008wordingneutralFV 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 FE2" is the class's best as a share of FE2'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 FE2'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.