BoP Lab / Classes / FE2
FE2 vs STU vs SRF3 pace at every track
Lap times across years say as much about the weather as the class. % of FE2 is each class's best lap as a share of FE2'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.
Closest to the field: FE2 100.0% of FE2 Flinn Lazier, Sonoma Raceway Runoffs 2018 race · STU 83.4% of FE2 Franklin Church, Sonoma Raceway Runoffs 2018 qualifying · SRF3 107.6% of FE2 Franklin Futrelle, Virginia International Raceway Runoffs 2022 race
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| Qual best | Race best | Trap | Qual best | Race best | Trap | vs FE2 | % of FE2 | Qual best | Race best | Trap | vs FE2 | % of FE2 | |||
| Road America Runoffs 20262026-09-28 | 2:12.326Franklin Futrelle · fastest of 8 · top 5 within 1.9s-0.149s (-0.11%) | 2:11.881Franklin Futrelle · fastest of 8 · top 5 within 1.6s-1.458s (-1.09%) | 143.5Steve Whitston-5.5 mph (-3.7%) | 2:24.912Richard Astacio · fastest of 17 · top 5 within 2.6s+1.829s (+1.28%) | 2:26.416Richard Astacio · fastest of 16 · top 5 within 1.5s+1.919s (+1.33%) | 145.1Hugh Stewart+0.8 mph (+0.5%) | +14.535squal +12.586s | 111.0%qual 109.5% | 2:27.443Tyler Stephens · fastest of 44 · top 5 within 0.3s-0.783s (-0.53%) | 2:29.257Peyton Long · fastest of 42 · top 5 within 0.3s-0.582s (-0.39%) | 134.1Bobby Sak+0.4 mph (+0.3%) | +17.376squal +15.117s | 113.2%qual 111.4% | ||
18 rule changes (FE2: 1, STU: 15, SRF3: 2)5 cars added · 3 weight · 2 engine · 2 induction · 2 tyres & wheels · 4 wording · GT3U wheel and tyre options clarified: 15x7 with 225 section at +275 lbs; 15x9 with 245 section at +275 lbs plus 1.5%; 16–18x9 with 245 section at +275 lbs plus 3.0%. · STU cars at or under 2,825 lbs minimum weight limited to 8-inch wheels; over 2,825 lbs limited to 9-inch wheels. · STU GT3U minimum weight increases from GT3 race weight plus 225 to plus 275 pounds; 2.0L unrestricted engines add 75 lbs. · STU adds BMW M50B20TU engine, 1991 cc, minimum weight per chart, must meet all STU engine regulations. · STL, STU weight calculation procedure clarified: positive percentages added first, negative subtracted second, then fixed weights applied. · STU Honda K20C1 Turbo I4 turbo restrictor increases from 35mm to 36mm TIR. · STU GT86 Cup car must meet 2022 Toyota GR Cup rules, tires maximum 245 section width. · STU Mazda Renesis Street Port added to Table B with 2450 lbs minimum weight and 70mm throttle body options. · STU eliminates 33 and 34 mm inlet restrictor options, removing minimum weights of 2380 and 2525 lbs. · SRF3 spark plugs limited to NGK LTR7IX-11 P/N G301041 only; washers and sealing rings prohibited. · STU Mazda MZR engines may now use Fab 9 Elite NC MX5 Performance Intake manifold as alternative option. · STU Mazda MZR (LF, L3, L5) Turbo added; Goodwin intake removed, Jack Spania Racing 70 mm intake and Fab9 Tuning bottom-mount turbo kit approved. · STU 36mm restrictor revised to 2830 cc, 37mm to 2980 cc. · STU removes 275 tire option and 2% weight adder for cars over 3150 lbs; maximum section width now 245. · STU Honda K20 and K24 engines lose 2% weight penalty; minimum weight now per chart only. · STU Honda K24 engine swap weight increases by 2 percent, effective November 1, 2025. · FE and FE2 Enterprise bubble tail part WM138014 now allowed; FE2 must use this configuration only. · SRF3 adds HD Oil Cooler P/N G1148500 option alongside standard P/N G480503, no fan permitted.show
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| Road America Runoffs 20252025-09-29 | 2:12.475Franklin Futrelle · fastest of 11 · top 5 within 1.4s+0.969s (+0.74%) | 2:13.339Franklin Futrelle · fastest of 10 · top 5 within 0.6s+0.591s (+0.45%) | 149.0Steve Whitston+3.7 mph (+2.6%) | 2:23.083Peter Cunningham · fastest of 16 · top 5 within 2.6s-3.144s (-2.15%) | 2:24.497Chip Herr · fastest of 15 · top 5 within 3.8s-1.327s (-0.91%) | 144.3Chip Herr-1.0 mph (-0.7%) | +11.158squal +10.608s | 108.4%qual 108.0% | 2:28.226Bobby Sak · fastest of 43 · top 5 within 0.6s+0.453s (+0.31%) | 2:29.839Morgan Burkhard · fastest of 42 · top 5 within 0.3s+1.710s (+1.15%) | 133.7Bobby Sak-1.5 mph (-1.1%) | +16.500squal +15.751s | 112.4%qual 111.9% | ||
22 rule changes (FE2: 1, STU: 18, SRF3: 3)6 weight · 4 cars added · 3 tyres & wheels · 2 engine · 1 induction · 3 wording · 3 other · SRF3 adds oil cooler options P/N G480503 and P/N G1148500; brake rule restructured to list Hawk Blue pads, Wilwood rotor, caliper kit, master cylinder options. · STU Lotus Elise SC and Exige SC weight reduced from 2450 to 2250 lbs. · STU-TCR gains GT3 TCR spec lines; 275 tyre option now costs 150 lb adder, up from 100 lb. · Lotus Evora GT4 minimum weight drops to 2700 lbs; Elise Cup R to 2250 lbs; Elise SC and Exige SC to 2450–2550 lbs. · STU 2.8–3.2L N/A engines now permit 245 max tyre width; over 3150 lbs cars may run 275 with 2% weight penalty. · STU Mazda MZR intake manifold now allows Goodwin 61-2510 or Gato Performance 31972. · STU Honda JDM H23a added, 2259 cc, minimum weight per chart, must meet ST engine regulations. · STU wheels capped at 18 inches diameter; under 2,850 lbs max 8 inches wide, over 2,850 lbs max 9 inches wide. · STU-GT3U minimum weight reduced from plus 250 to plus 225 pounds; wheel and tyre options clarified with weight adjustments. · FE2 allows pre-approved driver safety and comfort seat and control modifications for drivers with disabilities, per logbook. · SRF drivers with disabilities may modify seat and controls for safety and comfort with SCCA approval, noted in logbook, for that driver only. · SRF SADEV-SRF3 6-speed sequential transmission: effective date clarified to 1 April 2025 onward. · STU BMW N54/N55 3.0 classified at chart plus 3% minimum weight; N54 twin turbo not allowed. · STU Mini Cooper S SC pulley diameter reduced to 2.185 inches. · STU Honda K20C1 Turbo I4 exempted from 3% direct injection weight adder. · STU GT3U minimum weight increases 150 pounds to 250 pounds. · STU Audi 1.8T Wagon removed; Porsche 944 1800cc weight to Chart, turbo inlet restrictor deleted. · STU-GT3 reclassified as STU-GT3U, effective 1 January 2026. · STU GT3 TCR may run 275-wide DOT tires with 100 lb weight penalty; A compound prohibited at 275. · STL STU Mazda Miata alternate front hubs Mazda Motorsports Development Part #0000-04-5HUB-S1 approved. · STU BMW N54/N55 turbo inlet restrictors now required per GCR definition; twin turbo conversion to single turbo clarified. · STU Mini Cooper S SC: 1900 stock pulley spec to 2.565 diameter; 2100 now permits 2.285 diameter pulley.show
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| Road America Runoffs 20242024-10-01 | 2:11.506Porter Aiken · fastest of 18 · top 5 within 0.5s-1.300s (-0.98%) | 2:12.748Porter Aiken · fastest of 17 · top 5 within 2.0s-0.523s (-0.39%) | 145.3Porter Aiken+1.9 mph (+1.3%) | 2:26.227Thomas Noble · fastest of 18 · top 5 within 2.3s-1.656s (-1.12%) | 2:25.824Thomas Noble · fastest of 17 · top 5 within 2.4s-2.586s (-1.74%) | 145.3Thomas Noble+1.1 mph (+0.8%) | +13.076squal +14.721s | 109.9%qual 111.2% | 2:27.773Denny Stripling · fastest of 57 · top 5 within 0.3s-2.013s (-1.34%) | 2:28.129S Sandy Satullo III · fastest of 52 · top 5 within 0.7s-2.909s (-1.93%) | 135.2Denny Stripling+3.4 mph (+2.6%) | +15.381squal +16.267s | 111.6%qual 112.4% | ||
14 rule changes (STU: 4, SRF3: 10)2 aero · 2 suspension & brakes · 1 induction · 1 tyres & wheels · 1 weight · 3 wording · 4 other · SRF3 air filter rule removes K&N RC-9160 option, specifies Weems P/N WM301020 only. · SRF Wilwood vented rotor minimum thickness increases to 13.25mm, 0.522 inches. · SRF3 Hoosier decal placement changed from four logos on nose and tail to three logos on sides and center front. · SRF Hoosier contingency decal requirement reduced from four decals in specific locations to three decals with simplified placement. · SRF wet tyres: front P185/60R13 H20 or W2 and rear P205/60R13 H20 or W2 removed; front P185/65R13 W2 and rear P205/60R13 W2 now required. Hoosier decal placement specified. · STU RWD turbo cars no longer required to reduce inlet restrictor by 1 mm from table minimum. · SRF3 alternator pulley minimum weight drops from 12 to 11 oz, adds P/N G902131 six-row option. · STU Mini Cooper S SC gains alternate LEAP OMICRON hood scoop part LEP-OMICRON3 as permitted option. · STU BMW S54 B32 OEM dry sump oiling system now permitted. · STL and STU now permit electric power steering pumps, OEM electric-assisted steering, or column-mounted electric steering assist systems. · SRF rain/brake light must be Super Bright LEDs Inc. P/N PT-STRB-R24; secondary filament must connect to rain light switch. · SRF brake light must be Super Bright LEDs Inc. P/N PT-STRB-R24, with SCCA Enterprises P/N 180427A pigtail and strobing rain light kit. · SRF adds mandatory front brake ducts 12–36 inches, throttle pedal heel-toe extension, braided stainless flex lines, camber limit 5.0 degrees, radiator opening height 3½ ± ½ inches, rear shift cable clamp P/N WM302007A. · SRF radiator options expanded: Enterprises P/N 480465 with baffle 480464, 480466, or Automotive 1R698 and CU698 allowed if cross-reference equivalent.show
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| Virginia International Raceway Runoffs 20232023-09-23 | 1:50.665Charles Russell Turner · fastest of 26 · top 5 within 2.3s-0.188s (-0.17%) | 1:51.098Franklin Futrelle · fastest of 19 · top 5 within 1.4s-20.947s (-15.86%) | 141.3Franklin Futrelle-0.6 mph (-0.4%) | 2:00.389Johan Schwartz · fastest of 13 · top 5 within 2.3s-0.226s (-0.19%) | 2:02.302Mark Liller · fastest of 14 · top 5 within 1.6s-30.055s (-19.73%) | 144.0Mark Liller+0.1 mph (+0.1%) | +11.204squal +9.724s | 110.1%qual 108.8% | 2:03.842Morgan Burkhard · fastest of 40 · top 5 within 0.2s+0.126s (+0.10%) | 2:04.911David Ogburn · fastest of 39 · top 5 within 0.3s-17.155s (-12.08%) | 134.5Bobby Sak+0.1 mph (+0.0%) | +13.813squal +13.177s | 112.4%qual 111.9% | ||
7 rule changes (STU: 3, SRF3: 4)2 engine · 2 tyres & wheels · 1 cars added · 1 weight · 1 wording · STU adds 2022 Toyota GR Cup and GR86 Cup, both 2387cc, 2700 lbs, 18-inch wheels, 245/620R18 slicks. · SRF wet front tyre changes to Hoosier P/N 46100 P185/60R13 H20 or W2 with 2.5" ground clearance. · SRF front W2 rain tyre Hoosier part number changes from 46100 to 46101 P185/65R13. · STU Mazda BP5A now classified at 1839 cc displacement, 2510 lbs minimum weight, alternate intake manifold permitted. · SRF removes 1985 Renault Alliance solid front rotor option; restrictor sizes decrease 1mm for newer Kawasaki and multi-brand engines; minimum weights increase to 1100 lbs. · SRF3 alternate dash panel P/N 180100 or 180101 moved from optional to required bodywork section. · STU minimum weights adjusted: 2450 cc to 2595 lbs, 2600 cc to 2710 lbs.show
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| Virginia International Raceway Runoffs 20222022-09-24 | 1:50.853Charles Russell Turner · fastest of 25 · top 5 within 1.1s-0.209s (-0.19%) | 2:12.045Jason Conzo · fastest of 22 · top 5 within 1.8s+19.891s (+17.74%) | 141.9Eric Cruz-0.6 mph (-0.5%) | 2:00.615Johan Schwartz · fastest of 21 · top 5 within 2.6s+0.667s (+0.56%) | 2:32.357Mark Liller · fastest of 19 · top 5 within 4.3s+31.874s (+26.46%) | 143.9Johan Schwartz+0.1 mph (+0.1%) | +20.312squal +9.762s | 115.4%qual 108.8% | 2:03.716Franklin Futrelle · fastest of 44 · top 5 within 0.6s-0.908s (-0.73%) | 2:22.066Franklin Futrelle · fastest of 40 · top 5 within 1.2s+17.311s (+13.88%) | 134.5David Ogburn+2.1 mph (+1.6%) | +10.021squal +12.863s | 107.6%qual 111.6% | ||
24 rule changes (STU: 21, SRF3: 3)6 weight · 4 engine · 2 aero · 2 cars added · 2 tyres & wheels · 6 wording · 2 other · STU Mazda 13B Turbo added as Chart Limited displacement, streetport only, alternative turbos only. · STU OEM louver vents no longer count against vent allowance or 200 square inch limit. · STU non-4-valve engines gain 9% base engine weight reduction allowance; 2400cc minimum weight drops 1 lb to 2595. · STU normally-aspirated engines 2976cc–3200cc with single throttle body lose 10% base engine weight reduction allowance. · ST removes redundant language about engine balance shaft removal and alternate pulley installation. · SRF tire rule wording clarified: tires must be run as delivered. · SRF brake rotor minimum thickness reduced from 13.25 mm to 12.20 mm; seals and air filter specs clarified. · STU cars that qualified for 9 inch wheels in 2021 may continue running them through 2022 only. · STU splitter definition clarified: must attach to lowest point of front, have no vertical deviations. · STU BMW E36 M3 (95-99) S52B32 minimum weight cut to 3110 lbs from 3200, displacement to 3152 cc. · STU BMW S50B32 Euro maximum displacement 3201 cc, minimum weight 3300 lbs, permits 0.040 overbore and 0.5 compression increase. · ST engine swap origin rule narrowed: North America changed to United States only for case-by-case approval. · STU Honda CRX 84-91 and Civic Del Sol 93-97 both ineligible for front-wheel-drive weight reductions. · STU wheel width rule clarified: under 2950 lbs uses max 8.0 inches, 2950 lbs and over uses max 9.0 inches. · STU single-throttle body cars get lower minimum weights: 2450cc to 2596 lbs, 2500cc to 2635 lbs, 2550cc to 2675 lbs. · STU single throttle body weight reduction removed; minimum weights revised down to 2990 lbs at 3000cc from 3300 lbs. · STU Audi A4 1.8T minimum weight fixed to 3050 lbs, K04 turbo removed, VF30 with 35mm restrictor required; Porsche 944 1800 weight fixed to 3050 lbs, VW/Audi 1.8L engine removed, 35mm inlet restrictor required. · STL and STU Improved Touring vehicles must now conform to section 9.1.4 Tires & Wheels. · STU engines may delete balance shafts and plug openings; alternate pulleys or gears allowed only for timing belt or chain operation. · STU hood vents now allow louvers within 200 square inches. · STU adds Honda K23 with 2354 cc displacement and chart minimum weight, K24 block allowed with K23 internals and head. · STU Honda K23 relaxes internal engine requirement, now needs only K23 crankshaft. · STL/STU intake manifold and cylinder head porting clarified as free; intake and exhaust porting wording removed. · SRF wet tyres front P185/65R13 W2 option added; air box clarified as-delivered; SRF3 restrictor plate G301048 mandatory Jan 1 2022; P2 motorcycle engines up to 1005cc with 35mm restrictor, 2009+ stock 1075 lbs, 2008 stock 1025 lbs, modifie…show
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| Indianapolis Motor Speedway Runoffs 20212021-09-25 | 1:36.395Max Grau · fastest of 28 · top 5 within 0.7s | 1:36.655Max Grau · fastest of 28 · top 5 within 0.7s | 146.2Gray Fowler | 1:47.078Joe Moser · fastest of 30 · top 5 within 2.0s-1.843s (-1.69%) | 1:47.441Joe Moser · fastest of 28 · top 5 within 1.8s-1.946s (-1.78%) | 146.9Kip VanSteenburg | +10.786squal +10.683s | 111.2%qual 111.1% | 1:49.520Franklin Futrelle · fastest of 84 · top 5 within 0.5s-0.304s (-0.28%) | 1:50.095John Black · fastest of 82 · top 5 within 0.2s+0.313s (+0.29%) | 132.1Matthew Horst | +13.440squal +13.125s | 113.9%qual 113.6% | ||
18 rule changes (STU: 12, SRF3: 6)3 cars added · 2 engine · 1 aero · 1 suspension & brakes · 1 tyres & wheels · 1 weight · 7 wording · 2 other · SRF wet tyres add Hoosier W2 option alongside existing H20 from October 4, 2021. · SRF adds SADEV-SRF3 6-speed sequential transmission option with ratios 3.0–0.92:1 and 3.20 final drive. · SRF seal requirements clarified: seals now must be on driveline components in designated locations; unsealed components removed and inspected by CSR or Enterprises rather than engine shipped for testing. · STU fender flare wording clarified: flare of exterior contour may not change wheel opening size, location or shape from side view. · STU Mazda 12A Bridgeport weight reduced from 2550 lbs to 2350 lbs. · SRF3 alternator pulley specified as P/N G902130 or G902130A, minimum 12oz. · STU fender flare rules clarified: maximum 2 inches total, must cover tire contact patch from above, cannot alter body configuration or wheel opening geometry. · STU Honda S2000 now allows F20/F22 K24 crankshaft with chart weight for achieved displacement. · ST oil coolers and filters now explicitly listed as addable or substitutable parts in vents and breathers section. · SRF and SRF3 mandatory identification revised: removed Ford Performance and Blue Oval decals, added Hoosier logo placement. · ST 90-05 Mazda Miata allowed alternate front wheel hub Mazda Motorsports Development Part #0000-04-5HUB-S1. · ST cars may now relocate ABS actuation hardware and wiring anywhere in the engine compartment. · STU Porsche PDK automatic transmission limited to 8 forward speeds; sequential DCT systems require 3.5% minimum weight increase. · STU Mazda 13B Street Port 2400 removes choke location rule, allows auto-type 2bbl with any dual-Y manifold. · STU driveshaft and half-shafts now explicitly permitted in steel or aluminum, removing OEM material requirement. · STU Mazda 13B Spec and Bridge Port removed; Street Port added at 2400 lbs minimum weight. · SRF rear springs limited to P/N 280390 only, previous part numbers no longer allowed; ground clearance wording clarified. · ST aero devices and reference areas must include end plates, exclude fasteners under 1/2" protrusion.show
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| Road America Runoffs 20202020-10-02 | 2:12.806Scott Rettich · fastest of 25 · top 5 within 0.6s | 2:13.271Owen McAllister · fastest of 23 · top 5 within 0.7s | 143.4Owen McAllister | 2:27.883David Fiorelli · fastest of 14 · top 5 within 4.1s | 2:28.410Anthony Geraci · fastest of 14 · top 5 within 3.1s | 144.2David Fiorelli | +15.139squal +15.077s | 111.4%qual 111.4% | 2:29.786TJ Acker · fastest of 59 · top 5 within 0.5s | 2:31.038Justin Hille · fastest of 55 · top 5 within 0.2s | 131.9Charles Russell Turner | +17.767squal +16.980s | 113.3%qual 112.8% | ||
26 rule changes (FE2: 2, STU: 17, SRF3: 7)4 engine · 4 weight · 2 cars added · 1 suspension & brakes · 1 tyres & wheels · 12 wording · 2 other · FE2 oil cooler rule clarified: Setrab 50-625-7612 or any cooler with max core 13 inches wide by 6.5 inches high allowed. · STU fender flare rule reworded: now per-corner up to 2" total, 1% weight penalty applies to entire modification. · STL and STU clarify weight adjustment calculation order: engine adjustments first, then chassis percentage additions, subtractions, and fixed pounds. · STL STU rear wing Gurney flap terminology clarified from wicker to Gurney flap in mounting and chord rules. · STU request for alternate intake manifold denied; no change to rules. · GT3 and STU add Borg-Warner EFR6258 turbocharger to approved turbo lists. · STU large displacement turbo engines limited by GCR turbo list; no BoP change granted. · STU sequential shifters referred to Board of Directors for approval; no rule change effective. · SRF3 shocks no longer require the same brand in all positions; only SCCA P/N 280407 bump stops allowed, one per shock, all must be sealed by Enterprises. · STU Mazda 13B Bridge Port and Street Port added with 2550 lbs and 2250 lbs minimum weight respectively. · SRF3 bump stop must be SCCA P/N 280407, no modifications, optional, maximum one per shock. · SRF Penske shock P/N 280396 bump stop P/N 280407 becomes mandatory, maximum one per shock, effective 05/01/2020. · STU Honda S2000 gains HKS Supercharger kits 12001-AH006 and 12001-AH010 as allowed options. · STU Lotus Elise Cup R and SC Exige SC gain 100 lbs minimum weight to 2300, 2500. · STU Volkswagen GTI/GLI MK5 and Jetta Mk4 may now install turbo inlet restrictor in OEM housing, per TIR spec. · STU Honda K20C1 Turbo I4 restrictor reduces from 36mm to 35mm. · STU GM Ecotech LNF now permitted without turbo, with LE5 head and intake manifold, meeting STL specs. · STU Porsche 944 now permits VW/Audi 1.8L and 2.0L turbo engines as alternates to original. · STU vehicles over 2951 lbs base weight may use 9 inch wide wheels, changed from 2950 lbs. · STU turbocharged engines now use base weight instead of minimum weight; DFI cars add 3% to base weight. · SRF rain and brake rule supersedes GCR 9.3.32.B.2 effective 1/1/2024 through 12/31/2024. · FE minimum weight rises to 1270 lbs; FE2 minimum weight rises to 1270 lbs; new spring options added; tire warmers prohibited. · SRF adds tire warmer prohibition and specifies Hoosier dry and wet tire part numbers. · SRF front nose weight minimum reduced from 35 to 32 lbs. · SRF2 becomes Regional Only; SRF3 nomenclature changed from GEN3 to Ford 1.6L conversion; SRF and SRF3 no longer compete together for points. · STU allows OEM electronic throttle bodies, manual conversion, cam changes, and manual-to-electronic conversion with same inner diameter.show
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| Virginia International Raceway Runoffs 20192019-10-05 | 1:51.062Liam Snyder · fastest of 20 · top 5 within 1.3s | 1:52.154Liam Snyder · fastest of 19 · top 5 within 0.7s | 142.6Robert Vanman | 1:59.948Kevin Boehm · fastest of 25 · top 5 within 3.5s | 2:00.483Kevin Boehm · fastest of 25 · top 5 within 2.5s | 143.8Kevin Boehm | +8.329squal +8.886s | 107.4%qual 108.0% | 2:04.624Brian Schofield · fastest of 54 · top 5 within 0.6s | 2:04.755Bobby Sak · fastest of 53 · top 5 within 0.3s | 132.4Bobby Sak | +12.601squal +13.562s | 111.2%qual 112.2% | ||
25 rule changes (STU: 22, SRF3: 3)5 aero · 5 cars added · 4 engine · 3 induction · 6 wording · 2 other · STU wing assembly wording corrected: no part may be higher than roof height. · SRF drivers may now use Dash Windscreen Kit P/N 1180103 or P/N 180102. · STU Nissan SR20DET removes -2mm penalty from Table B. · STU allows alternate intake manifolds on case-by-case basis; stock throttle device and manifold otherwise required. · SRF3 multi-piece nose assembly approved for use; no other nose modifications allowed. · STU aftermarket side skirts now allowed if they meet 3-inch ride height, lack ducts except jacks or exhaust, don't exceed fascia width, stay below door bottom, and don't reinforce chassis. · STU wheel flare wording clarified: each fender may be flared to 2" with 1% weight penalty, maintaining OEM profile. · SRF3 brakes now accept Hawk Blue 9012 pads P/N 801993 only; Wilwood vented rotor P/N 800065 minimum 13.25mm as delivered; caliper bushings P/N 1196185 A or B permitted. Shock absorbers: Penske P/N 280396 only, sealed, with SCCA bump rubber… · STL and STU ride height measurement clarified: lowest rocker panel point without driver, excluding pinch weld. · STU Mazda 13B Bridge Port now permits ELITE ROTARY SHOP FD V2.0 intake manifold; stock throttle body requirement removed. · STU Mazda MZR gains alternate Goodwin intake manifold option with stock or Acura throttle body. · STU alternate suspension components rule moved from section E to section D. · STU Honda/Acura B20 now permits B16 or B18 VTEC cylinder head and matching intake manifold. · STU flared fenders up to 2" with 1% weight penalty moved from base to Advanced Aero. · STU Honda Civic Si TCA 2017- requires 37mm TIR throttle as of June 1, 2019. · STU BMW S54B32 OEM classified separately from E46, displacement 3246 cc, minimum weight 3300 lbs, OEM engine mandatory. · Honda Civic Si 2017- added to STU with 1500cc displacement, 2800 lbs minimum weight, OEM engine and bodywork, specific HPD parts allowed. · STU BMW E46 S54 OEM 3246cc added at 3300 lbs minimum; no Super Touring allowances, OEM intake and cams, 1mm overbore, compression +0.5 permitted. · STU Mazda 13B and 13B Bridge Port may use 13B RE or REW housings and intake with turbo removed. · STU Honda K24 may use intake part numbers 17100-RRB-A00 or 17100-PRB-A10. · STU Mazda 12A Bridge Port added, minimum weight 2550 lbs, Nikki or Auto-type carburettor with specified modifications. · STU World Challenge car weight rule deleted; no replacement specified. · STU AWD/RWD cars no longer must reduce restrictor 1 mm from table. · STU rear wing maximum 12" cord, 72 sq in end plates each, roof height max, body width limit. · STU adds Honda K20C1 Turbo I4, 1996 cc, 3025 lbs minimum weight, 36mm TIR required.show
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| Sonoma Raceway Runoffs 20182018-10-10 | 1:35.040Flinn Lazier · fastest of 9 · top 5 within 1.5s | 1:35.563Flinn Lazier · fastest of 9 · top 5 within 1.7s | 126.8Scott Rettich | 1:19.234Franklin Church · fastest of 10 · top 5 within 21.5s | 1:46.514Kevin Boehm · fastest of 9 · top 5 within 7.4s | 103.0Franklin Church | +10.951squal -15.806s | 111.5%qual 83.4% | 1:46.117Robeson Clay Russell · fastest of 36 · top 5 within 0.5s | 1:47.053TJ Acker · fastest of 35 · top 5 within 0.2s | 110.2Steve Fogg | +11.490squal +11.077s | 112.0%qual 111.7% | ||
| No rule changes on record between these events | |||||||||||||||
| Indianapolis Motor Speedway Runoffs 20172017-09-25 | 1:48.921Rob Huffmaster · fastest of 34 · top 5 within 2.0s | 1:49.387Rob Huffmaster · fastest of 31 · top 5 within 2.4s | 1:49.824John Black · fastest of 101 · top 5 within 0.5s | 1:49.782Tray Ayres · fastest of 94 · top 5 within 0.4s | |||||||||||
| No rule changes on record between these events | |||||||||||||||
| Mid-Ohio Sports Car Course Runoffs 20162016-09-19 | 1:32.738Joe Moser · fastest of 16 · top 5 within 2.5s | 1:34.597Cameron Maugeri · fastest of 16 · top 5 within 0.8s | 1:34.363John Black · fastest of 41 · top 5 within 0.5s | 1:34.947Cliff White · fastest of 39 · top 5 within 0.3s | |||||||||||
| No rule changes on record between these events | |||||||||||||||
| Daytona International Speedway Runoffs 20152015-09-21 | 2:05.494Eric Heinrich · fastest of 18 · top 5 within 4.6s | 2:06.756Eric Heinrich · fastest of 17 · top 5 within 3.5s | 2:08.557Kerry Jacobsen · fastest of 29 · top 5 within 1.1s | 2:10.215Chad Galloway · fastest of 29 · top 5 within 0.3s | |||||||||||
By track
| Track | Events | Typical % of FE2 | Best | Latest |
|---|---|---|---|---|
| Road America | 4 | 100.0% | 100.0%Runoffs 2020 | 100.0%Runoffs 2026 |
| Virginia International Raceway | 3 | 100.0% | 100.0%Runoffs 2019 | 100.0%Runoffs 2023 |
| Indianapolis Motor Speedway | 2 | 100.0%1 of 2 with FE2 | 100.0%Runoffs 2021 | 100.0%Runoffs 2021 |
| Daytona International Speedway | 1 | 0 of 1 with FE2 | ||
| Mid-Ohio Sports Car Course | 1 | 0 of 1 with FE2 | ||
| Sonoma Raceway | 1 | 100.0% | 100.0%Runoffs 2018 | 100.0%Runoffs 2018 |
About this data
Every event the class ran, at any track, oldest to newest on the chart and newest first in the table. Each point is the class's best lap as a share of FE2's best on the same day: the weather and the day cancel out, so one figure compares across years where lap times cannot; a class that suits one track more than another still reads differently there. It still moves when the yardstick's own balance changes or its field thins, and an event the yardstick did not run has no point. A best from fewer than three cars is greyed. The rule changes that took effect between two events are folded between their rows.