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BoP Lab / Buttonwillow Raceway Park

AS vs SM vs BSpc vs EP pace at Buttonwillow Raceway Park

Class · click a class to switch, + to compare alongside (up to 4: remove one to add another)
AS×B SpecB-SpecvsBSpc×vsEP×F6F500FAFCFE 2FE2FFFPFVFXGT1GT2GT3GT3UGTLGTXHPPP1P2PXvsSM×SMXSRF3STLSTUT1T2T3T4
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: AS 2:01.590 Christopher Qualls, Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park race · SM 2:04.724 Dakota Dickerson, Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park qualifying · EP 1:55.358 Aaron Downey, Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park qualifying

EventASSMBSpcEP
Qual bestRace bestTrapQual bestRace bestTrapvs AS% of ASQual bestRace bestTrapvs AS% of ASQual bestRace bestTrapvs AS% of AS
Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park ST20FEB212020-02-212:05.363Christopher Qualls · fastest of 3 · top 3 within 7.3s2:01.590Christopher Qualls · fastest of 3 · top 3 within 9.9s123.6Christopher Qualls2:04.724Dakota Dickerson · fastest of 19 · top 5 within 0.6s2:05.409Justin Casey · fastest of 19 · top 5 within 0.2s118.6Nick Leverone+3.819squal -0.639s103.1%qual 99.5%1:55.358Aaron Downey · fastest of 8 · top 5 within 10.6s1:57.801Aaron Downey · fastest of 7 · top 5 within 6.2s132.7Aaron Downey-3.789squal -10.005s96.9%qual 92.0%
25 earlier rule changes on record, in force before Cal Club Region Hoosier SCCA Super Tour @ Buttonwillow Raceway Park (from 2019)5 cars added · 3 weight · 2 suspension & brakes · 1 induction · 14 wording · AS rear trailing arms may be replaced with tubular arms maintaining stock length and axle location purpose only. · AS Ford and GM full-prep cars get 200 lb weight reduction, up from 150 lb. · 05-10 Ford Mustang Coupe GT 4.6L OHC classified AS with 3200 lbs minimum weight, HR cam restricted prep. · AS 10-15 Chevrolet Camaro Full Prep classified with 3400 lbs base weight, over 313 CID engine 3700 lbs maximum. · HP Datsun 1200 carburetor choke size increases from 26mm to 30mm. · FP and EP Mazda Miata models standardized to 55mm throttle body diameter; brake spec clarified. · EP, FP, HP cylinder head rules reorganized for clarity; no performance change. · AS Spec Mustang (SMG) added as Restricted Prep class. · FP and HP Austin-Healey Sprite Mk I and MG Midget variants may replace rear bodywork aft of cockpit with stock-appearing alternate material components. · EP Mazda MX-5 Global Cup classification year changes from 16-18 to 16-19. · Production suspension rule clarifies spindles, hubs, bushings, bearings, ball joints unrestricted. · Production carb rules clarified: carburetor options, fuel injection throttle body dimensions, and intake manifold restrictions reorganised and refined. · EP, FP, HP carburetors clarified: jets, needles, metering rods, needle valves unrestricted; choke parts removable; permitted optional carburetors listed. · AS class minimum ride height clarified to 5 inches measured at rocker panel, excluding seams and cladding. · EP Mazda MX-5/Miata eligibility years expanded from 1999-2002 to 1999-2005. · AS Ford Mustang (79-93) 313 CID and under loses 100 lbs to 3150; over 313 CID loses 100 lbs to 3450. · EP Mazda RX-8 firewall modification allowed for 13B engine fitment in stock location. · EP, FP, HP clarified: tapered holes in ball joints now allowed for bolt conversion; wheel bearings and hubs unrestricted at any wheel. · EP open cars may now use aftermarket hardtops if they retain OEM appearance; specific model hardtop allowances removed. · EP Mazda RX-7 12A and 13B (79-85) lose up to 80 lbs; 13B (86-91) loses up to 79 lbs. · SM fuel pump and filter must be Mazda or OEM Equivalent part. · AS Spec Mustang (SMG) newly classified with 107.1 wheelbase, 3.73 gears, 355mm front brakes, 300mm rear. · SM 1999-2000 model year cars may use replacement Mazda ECU and injector harnesses, unmodified. · SM electrical rules reorganized and clarified; alternator external regulation now prohibited except via OEM ECU/kill switch. · SM removes tire tread protrusion beyond fender opening requirement from GCR 9.1.7.C.5.showhide
  • AS Rear Trailing Arms #28007suspension & brakessuspension & brakesAS rear trailing arms may be replaced with tubular arms maintaining stock length and axle location purpose only.
  • AS Weight reduction for cars running iron heads #28010weightfasterAS Ford and GM full-prep cars get 200 lb weight reduction, up from 150 lb.
  • AS 05-10 Mustang with HR cam classification #28226cars addedcars added05-10 Ford Mustang Coupe GT 4.6L OHC classified AS with 3200 lbs minimum weight, HR cam restricted prep.
  • AS 10-15 Camaro Full Prep classification #28227cars addedcars addedAS 10-15 Chevrolet Camaro Full Prep classified with 3400 lbs base weight, over 313 CID engine 3700 lbs maximum.
  • EP Request for Help for Datsun 1200 #27934inductionfasterHP Datsun 1200 carburetor choke size increases from 26mm to 30mm.
  • EP Request to List Mazda Miata Throttle Body Size #27907wordingwordingFP and EP Mazda Miata models standardized to 55mm throttle body diameter; brake spec clarified.
  • EP Re-organize Prep2 Cylinder Head Rules for Clarity & Consistency #27661wordingwordingEP, FP, HP cylinder head rules reorganized for clarity; no performance change.
  • AS Request to add SMG to 9.1.6.B.1 AS Intent #27140cars addedcars addedAS Spec Mustang (SMG) added as Restricted Prep class.
  • EP Request bodywork for Austin Healey Bugeye Sprite MK1 #27106wordingwordingFP and HP Austin-Healey Sprite Mk I and MG Midget variants may replace rear bodywork aft of cockpit with stock-appearing alternate material components.
  • EP Request to classify the GMX5 2019 #27263wordingwordingEP Mazda MX-5 Global Cup classification year changes from 16-18 to 16-19.
  • EP level one susp. component rule #27270wordingwordingProduction suspension rule clarifies spindles, hubs, bushings, bearings, ball joints unrestricted.
  • EP Clarification of Carb Rules - Prep 1 #27300wordingwordingProduction carb rules clarified: carburetor options, fuel injection throttle body dimensions, and intake manifold restrictions reorganised and refined.
  • EP Clarification of Carb Rules - Prep 2 #27301wordingwordingEP, FP, HP carburetors clarified: jets, needles, metering rods, needle valves unrestricted; choke parts removable; permitted optional carburetors listed.
  • AS Request Ride Height Clarification #26598wordingwordingAS class minimum ride height clarified to 5 inches measured at rocker panel, excluding seams and cladding.
  • EP Request Miata Eligibility - 2003 #27121cars addedcars addedEP Mazda MX-5/Miata eligibility years expanded from 1999-2002 to 1999-2005.
  • AS Request to Revert to 2017 Weights #25885weightfasterAS Ford Mustang (79-93) 313 CID and under loses 100 lbs to 3150; over 313 CID loses 100 lbs to 3450.
  • EP Allow Firewall Modification for Fitment of 13B into RX8 #26726wordingwordingEP Mazda RX-8 firewall modification allowed for 13B engine fitment in stock location.
  • EP Rollcenter Correction Clarification #25873suspension & brakesfasterEP, FP, HP clarified: tapered holes in ball joints now allowed for bolt conversion; wheel bearings and hubs unrestricted at any wheel.
  • EP Hardtops #26476wordingwordingEP open cars may now use aftermarket hardtops if they retain OEM appearance; specific model hardtop allowances removed.
  • EP Request for Competition Adjustment for 2nd Generation RX7 #25935weight -50 lbsfasterEP Mazda RX-7 12A and 13B (79-85) lose up to 80 lbs; 13B (86-91) loses up to 79 lbs.
  • SM Request to allow aftermarket fuel filters. #26370wordingwordingSM fuel pump and filter must be Mazda or OEM Equivalent part.
  • AS SMG Mustang eligibility in American sedan #26224cars addedcars addedAS Spec Mustang (SMG) newly classified with 107.1 wheelbase, 3.73 gears, 355mm front brakes, 300mm rear.
  • SM Request 99-00 replacement Wire harnesses #25602wordingwordingSM 1999-2000 model year cars may use replacement Mazda ECU and injector harnesses, unmodified.
  • SM Organize and Clarify 9.1.7.C.1.o. #25913wordingwordingSM electrical rules reorganized and clarified; alternator external regulation now prohibited except via OEM ECU/kill switch.
  • SM Strike Tire Tread Language #26123wordingwordingSM removes tire tread protrusion beyond fender opening requirement from GCR 9.1.7.C.5.

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