BoP Lab / Laguna Seca

SRF3 vs STU vs SM pace at Laguna Seca

Quickest here: SRF3 1:37.644 TJ Acker, Hoosier SCCA Super Tour (San Francisco Region) qualifying · STU 1:39.256 David Fiorelli, Hoosier SCCA Super Tour (San Francisco Region) qualifying · SM 1:46.110 Tristan Littlehale, Hoosier SCCA Super Tour (San Francisco Region) race

	Event	SRF3			STU					SM
	Event	Qual best	Race best	Trap	Qual best	Race best	Trap	vs SRF3	% of SRF3	Qual best	Race best	Trap	vs SRF3	% of SRF3
	Hoosier SCCA Super Tour (San Francisco Region) ST19JUL262019-07-26	1:37.644TJ Acker · fastest of 25 · top 5 within 0.8s	1:38.588Steve Fogg · fastest of 25 · top 5 within 0.7s	99.9Mike Miserendino	1:39.256David Fiorelli · fastest of 3 · top 3 within 3.9s	1:41.478Nathan Pope · fastest of 3 · top 3 within 2.9s	104.9David Fiorelli	+2.890squal +1.612s	102.9%qual 101.7%	1:46.159Tristan Littlehale · fastest of 11 · top 5 within 1.9s	1:46.110Tristan Littlehale · fastest of 11 · top 5 within 1.2s	87.0Justin Casey	+7.522squal +8.515s	107.6%qual 108.7%
28 earlier rule changes on record, in force before Hoosier SCCA Super Tour (San Francisco Region) (from 2019)4 cars added · 4 induction · 2 aero · 2 engine · 1 tyres & wheels · 15 wording · SRF drivers may now use Dash Windscreen Kit P/N 1180103 or P/N 180102. · STU Nissan SR20DET removes -2mm penalty in Table B. · STU alternate intake manifolds now allowed case-by-case instead of prohibited. · SRF3 nose assembly must use approved multi-piece design; no modifications allowed except as specified. · STU aftermarket side skirts must meet 3-inch ride height, no openings except jacks or side exhaust, no wider than fascias, not higher than door bottom, no chassis reinforcement. · STU fender flare wording clarified: each fender may be flared up to 2" for tire clearance with 1% weight penalty. · SRF3 brakes now allow Hawk Blue 9012 pads P/N 801993 only; shocks simplified to Penske P/N 280396 sealed assembly only, with optional SCCA Enterprises bump rubber P/N 280407 from 05/01/2020. · STL and STU ride height measurement clarified: without driver, at rocker panel lowest point, excluding pinch weld. · STU Mazda 13B Bridge Port may use ELITE ROTARY SHOP FD V2.0 intake manifold instead of stock. · STU Mazda MZR LF/L3/L5 may use Goodwin Part #61-2510 intake manifold with stock or Acura throttle body. · STU suspension rules clarified: alternate components from same manufacturer moved from section E to section D. · STU Honda/Acura B20 classified at 1973 cc, now permits VTEC B16 or B18 cylinder head and intake manifold. · STU flared fenders up to 2" with 1% weight penalty moved from base to Advanced Aero rules. · TCA Honda Civic Si (2017-) must run 37mm TIR maximum as of June 1, 2019. · STU BMW S54B32 OEM reclassified from E46 designation, 3246 cc, 3300 lbs minimum weight. · SM fuel pump and filter must be Mazda or OEM Equivalent part. · Honda Civic Si 2017- classified STU at 1500cc, 2800 lbs minimum with OEM engine and bodywork. · STU BMW E46 S54 OEM 3246cc added at 3300 lbs minimum weight, no Super Touring allowances. · STU Mazda 13B and 13B Bridge Port may use RE or REW housings and intake with turbo removed. · STU Honda K24 may use intake part #s 17100-RRB-A00 or 17100-PRB-A10. · STU Mazda 12A Bridge Port engine classified at 2550 lbs minimum weight with specified carburetor induction options. · STU World Challenge car weight calculation method removed; new basis unclear from text provided. · STU AWD cars no longer required to reduce restrictor 1 mm from table. · STU rear wing maximum cord length set to 12 inches, end plates to 72.0 square inches each. · 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. · STU Honda K20C1 Turbo I4 1996cc added at 3025 lbs minimum weight with 36mm TIR.showhide 2019-07-01 SRF3 SRF Dash Windscreen Kit #27028wordingwordingSRF drivers may now use Dash Windscreen Kit P/N 1180103 or P/N 180102. 2019-07-01 STU Remove -2mm penalty from SR20DET Nissan #26982enginefasterSTU Nissan SR20DET removes -2mm penalty in Table B. 2019-07-01 STU Request clarification for manifold and throttle in STU #27004inductionfasterSTU alternate intake manifolds now allowed case-by-case instead of prohibited. 2019-05-31 SRF3 New SRF Sectional Nose Rule Addition #26914wordingwordingSRF3 nose assembly must use approved multi-piece design; no modifications allowed except as specified. 2019-05-31 STU Request to clarify afterrmarket side skirts exhaust exit #26814wordingwordingSTU aftermarket side skirts must meet 3-inch ride height, no openings except jacks or side exhaust, no wider than fascias, not higher than door bottom, no chassis reinforcement. 2019-05-31 STU Wheel Flare wording #26872wordingwordingSTU fender flare wording clarified: each fender may be flared up to 2" for tire clearance with 1% weight penalty. 2019-05-01 SRF3 SRF Brakes and Shock Rule Changes #26629wordingwordingSRF3 brakes now allow Hawk Blue 9012 pads P/N 801993 only; shocks simplified to Penske P/N 280396 sealed assembly only, with optional SCCA Enterprises bump rubber P/N 280407 from 05/01/2020. 2019-05-01 STU Request Ride Height Clarification #26597wordingwordingSTL and STU ride height measurement clarified: without driver, at rocker panel lowest point, excluding pinch weld. 2019-04-01 STU Request to Use Japanese Mazda 13b Intake Manifold #25790inductionfasterSTU Mazda 13B Bridge Port may use ELITE ROTARY SHOP FD V2.0 intake manifold instead of stock. 2019-04-01 STU Request Alternate Intake for Mazda MZR In a Rear Wheel Drive App. #26352inductionunclearSTU Mazda MZR LF/L3/L5 may use Goodwin Part #61-2510 intake manifold with stock or Acura throttle body. 2019-04-01 STU E&O Suspension #26424wordingwordingSTU suspension rules clarified: alternate components from same manufacturer moved from section E to section D. 2019-04-01 STU Revisit B20 VTEC #26530enginefasterSTU Honda/Acura B20 classified at 1973 cc, now permits VTEC B16 or B18 cylinder head and intake manifold. 2019-04-01 STU Move Flared Fenders to STU Advanced Aero #26564aeroaeroSTU flared fenders up to 2" with 1% weight penalty moved from base to Advanced Aero rules. 2019-04-01 STU TCA Civic SI E&O #26606tyres & wheelsslowerTCA Honda Civic Si (2017-) must run 37mm TIR maximum as of June 1, 2019. 2019-04-01 STU S54 Spec line #26620wordingwordingSTU BMW S54B32 OEM reclassified from E46 designation, 3246 cc, 3300 lbs minimum weight. 2019-03-01 SM Request to allow aftermarket fuel filters. #26370wordingwordingSM fuel pump and filter must be Mazda or OEM Equivalent part. 2019-03-01 STU Request to Class Assignment for 2017 Civic #24287cars addedcars addedHonda Civic Si 2017- classified STU at 1500cc, 2800 lbs minimum with OEM engine and bodywork. 2019-03-01 STU Request to run E46 3246cc in STU #25126cars addedcars addedSTU BMW E46 S54 OEM 3246cc added at 3300 lbs minimum weight, no Super Touring allowances. 2019-03-01 STU Engine Classification for Rotary #25564wordingunclearSTU Mazda 13B and 13B Bridge Port may use RE or REW housings and intake with turbo removed. 2019-03-01 STU K24/K20 Head Swap Clarification/Amendment #25899wordingwordingSTU Honda K24 may use intake part #s 17100-RRB-A00 or 17100-PRB-A10. 2019-03-01 STU Request to Classify 12a Bridge Ported Rotary Engine #25985cars addedcars addedSTU Mazda 12A Bridge Port engine classified at 2550 lbs minimum weight with specified carburetor induction options. 2019-03-01 STU World Challenge Car Eligibility #26387wordingunclearSTU World Challenge car weight calculation method removed; new basis unclear from text provided. 2019-03-01 STU Request a phone call for discussion regarding weight #26398inductionfasterSTU AWD cars no longer required to reduce restrictor 1 mm from table. 2019-03-01 STU Advanced Aero E&O #26413aeroaeroSTU rear wing maximum cord length set to 12 inches, end plates to 72.0 square inches each. 2019-02-01 SM Request 99-00 replacement Wire harnesses #25602wordingwordingSM 1999-2000 model year cars may use replacement Mazda ECU and injector harnesses, unmodified. 2019-02-01 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. 2019-02-01 SM Strike Tire Tread Language #26123wordingwordingSM removes tire tread protrusion beyond fender opening requirement from GCR 9.1.7.C.5. 2019-01-01 STU Request to Equalize Direct Injected Turbo Cars #24890cars addedcars addedSTU Honda K20C1 Turbo I4 1996cc added at 3025 lbs minimum weight with 36mm TIR.

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 SRF3" is the class's best as a share of SRF3'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 SRF3'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.