BoP Lab / Buttonwillow Raceway Park
FE vs FM vs P1 pace at Buttonwillow Raceway Park
Lap times across years say as much about the weather as the class. % of FE is each class's best lap as a share of FE'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.
Quickest here: FE 1:47.040 Brandon Chappell, Super Tour Apr 2018 race · FM 1:45.954 Mike Anderson, Super Tour Apr 2018 race · P1 1:06.404 Chip Romer, Super Tour Feb 2023 qualifying
| Event | FE | FM | P1 | ||||||||||||
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| Qual best | Race best | Trap | Qual best | Race best | Trap | vs FE | % of FE | Qual best | Race best | Trap | vs FE | % of FE | |||
| Super Tour Feb 2024 CALCL242024-02-23 | 1:33.133Chip Romer · fastest of 7 · top 5 within 5.2s+26.729s (+40.25%) | 1:34.989Chip Romer · fastest of 7 · top 5 within 4.0s+0.267s (+0.28%) | 138.2Aaron Bailey-0.2 mph (-0.2%) | ||||||||||||
11 rule changes (FE: 3, P1: 8)2 weight · 1 aero · 8 wording · FE rain light now must meet FIA Standard 8874-2019, Technical List No. 76, effective 1/1/2024. · FE allows racer's tape for crash repair, panel security, and heat exchanger opening control; seam taping banned. · P1 Engine Table line H restrictor grows to 32 mm, weight rises to 1450 lbs; line I restrictor to 31 mm, weight to 1475 lbs. · P1 Group CN Honda K20A-FD2 removes engine modification restrictions; CRB may add intake restrictor if needed. · P1 SIR testing: vehicle deemed compliant if it stalls within 3 seconds of the stall test. · P1 intake restrictor rule clarified: flat plate, venturi, or Single Inlet Restrictor required; all intake air must pass through. · P1 ducted air rule clarified: top-exit ducted air must pass through heat exchanger, except cockpit opening and engine bay vents. · FE SADEV transmission rule removes note that all ratios under review and could be updated prior to sealing. · P1 aero height limit, front/rear overhang, and cockpit dimensions corrected to metric-inch equivalents. · P1 suspension covers must have symmetrical upper and lower surfaces, no airfoil cross-sections or angled downforce.show
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| Super Tour Feb 2023 CALCL232023-02-24 | 1:06.404Chip Romer · fastest of 3 · top 3 within 1.9s-27.144s (-29.02%) | ||||||||||||||
9 rule changes (FE: 5, P1: 4)2 engine · 1 aero · 1 suspension & brakes · 4 wording · 1 other · P1 aerodynamic devices may not extend more than 1cm below lower surfaces rear of front axle; body panels covering suspension must not be airfoil-shaped or create downforce. · FE drivers may now adjust brake bias manually during the race. · FE front and rear wing specifications clarified: adjustment ranges, shimming, Gurney flap sizes, mounting hardware, and measurement references refined. · P1 forced induction prohibited: turbocharging and supercharging not allowed. · FE engine heat shield and insulation between block and exhaust now permitted to protect fuel cell, filter, rail, lines. · P1 motorcycle-based engines with individual throttle bodies must use flat plate intake restrictors within 4 inches of primary butterfly. · FE tires must be run as delivered in sets of 4. · FE master cylinders clarified: Girling front .700" piston WM802005, rear .750" piston WM802006. · P1 bodywork rules clarified: cycle fenders prohibited, side body minimum height at front axle centerline, air ducting for downforce banned.show
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| Super Tour Feb 2022 CALCL222022-02-17 | 1:33.548Aaron Bailey · fastest of 6 · top 5 within 3.2s-1.427s (-1.50%) | 1:34.722Chip Romer · fastest of 6 · top 5 within 4.4s-1.502s (-1.56%) | 138.5Aaron Bailey-10.3 mph (-6.9%) | ||||||||||||
21 rule changes (FE: 8, P1: 13)3 engine · 2 aero · 2 cars added · 1 induction · 1 suspension & brakes · 11 wording · 1 other · P1 2-cycle 6-cylinder maximum displacement increases to 1725 cc, restrictor shrinks to 40mm, minimum weight drops to 1275 lbs. · P1 creates separate spec lines H and I for 2000cc and 2300cc engines at 1400 and 1445 lbs minimum weight respectively. · P1 Staudacher may run 950 lbs minimum weight with 38.5mm flat plate intake restrictor, removing prior weight-linked restrictor rule. · P1 adds 1355cc motorcycle-based engine line C at 1075 lbs minimum weight, no restrictor required. · FE removes qualifying tire marking requirements and rain tire set rules; renumbers tire warmer prohibition. · FE radiator screens may not protrude more than ¼ inch in front of the outside vertical plane of the sidepods. · FE radiator screens now allowed, maximum ¼ inch from sidepod front vertical plane. · P1 cockpit opening section allows tonneau covers to meet minimum dimensions; wording clarified on equipment attachment. · P1 Staudacher 1005cc homologated before 1-1-2014 may run 38.5mm flat plate intake restrictor at 950 lbs minimum weight. · P1 Spec Line C: FPIR not required at 1150 lbs, 1355cc max may run without FPIR at 1075 lbs. Spec Line G: up to 2000cc runs 30mm SIR at 1400 lbs, 2300cc runs 30mm SIR at 1445 lbs. · P1 classes B, C, D maximum valves per cylinder set to 4, previously unspecified. · P1 Spec Line A clarifies carburetor induction only, one per cylinder, balance tubes not allowed. · P1 Spec Line H notes clarify peripheral port or bridgeport allowed; wording only. · P1 Elan DP02-spec Mazda MZR sealed engine option removed effective 3/1/2021. · P1 Engine Table Spec Lines C and G change 'inlet restrictor' to 'intake restrictor' terminology. · FE front springs change to 800 lbs Hypercoil WM203013 Silver; rear to 900 lbs Hypercoil WM203014 Silver. · FE Gurney flaps clarified: front wing secondary only at 0.500" ±0.030", rear wing at 0.250" ±0.030". · FE Gurney flap wicker bill clarified: permitted on front wing secondary elements only, not main plane. · FE2 and FE spring part numbers WM203013 front and WM203014 rear required date moved to November 1, 2020. · P1 intake manifolds unrestricted unless engine requires flat plate restrictor; no plenums or balance pipes on restricted individual runner manifolds.show
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| Super Tour Feb 2020 ST20FEB212020-02-21 | 1:34.975Jim Devenport · fastest of 4 · top 4 within 7.1s-2.683s (-2.75%) | 1:36.224Jim Devenport · fastest of 4 · top 4 within 5.9s-2.632s (-2.66%) | 148.8Johnnie Crean+15.3 mph (+11.5%) | ||||||||||||
17 rule changes (FE: 6, P1: 11)2 cars added · 2 tyres & wheels · 1 aero · 1 engine · 1 removed · 1 suspension & brakes · 1 weight · 7 wording · 1 other · P1 sealed 2.0L Elan DP02-spec Mazda option removal date extended from 1/1/2020 to 1/1/2021. · FE2 Mazda 2.0L MZR engine now permitted in all SCCA events at 1250 lbs minimum; FE 2.3L becomes Regional Only through 2019 Runoffs. · P1 sealed 2.0 MZR engine removed effective 1/1/2020; competitors may run it under Spec Line G. · P1 Spec Line F: Restricted 2.0L Group becomes CN-spec Honda K20A-FD2, 2000cc, 1400 lbs minimum. · FE minimum weight rises to 1270 lbs; FE2 minimum weight rises to 1270 lbs; new spring options added; tire warmers prohibited. · FE Hoosier wet rear tire width increases from 7.5 to 8.0 inches, part number 44196 W3. · P1 traction control prohibited. · FE removes American Racer tires, mandates Hoosier dry tires 22.0 X 8.0-13 and 22.0 X 10.0-13, wet tires 22.0 X 7.5-13 and 22.0 X 9.0-13. · P1 permits mechanical, solenoid, and air-shifters; prohibits electronic pre-selection and multi-wheel power. · P1 minimum bodywork height rule moved and restated with new 115cm aerodynamic part height limit. · P1 consolidates fender louver rules into one section; removes duplicate allowance for louvers and clarifies brake and engine air ducts are permitted. · FE anti-roll bar links may be removed one per end for safety, but bars must stay connected. · FE and FE2 Enterprise bubble tail P/N WM138014 newly allowed for both classes. · P1 anti-intrusion panels now allowed anywhere on chassis sides instead of specified locations. · P1 bodywork wording clarified: comfort and safety for driver and passenger or driver only. · P1 Engine Table reference cleaned up; no performance change. · P1 Mazda Renesis Rotary engine spec line removed from Engine Table.show
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| Super Tour Apr 2019 ST19APR262019-04-26 | 1:49.749Jeff Read · only car+2.153s (+2.00%) | 1:50.132Jeff Read · fastest of 2+3.092s (+2.89%) | 119.6Joe Reppert | 1:49.608Mike Anderson · fastest of 3 · top 3 within 5.6s+3.285s (+3.09%) | 1:49.409Mike Anderson · fastest of 3 · top 3 within 4.9s+3.455s (+3.26%) | 121.2Mike Anderson | -0.723squal -0.141s | 99.3%qual 99.9% | 1:37.658Jim Devenport · fastest of 3 · top 3 within 8.6s-1.339s (-1.35%) | 1:38.856Jim Devenport · fastest of 3 · top 3 within 4.2s+1.745s (+1.80%) | 133.5Jeffrey Lederman | -11.276squal -12.091s | 89.8%qual 89.0% | ||
7 rule changes (FE: 1, P1: 6)1 tyres & wheels · 6 wording · P1 Staudacher and Honda K20A-FD2 engine table wording clarified; no performance change. · FE Hoosier rain tyre part numbers updated: front 44195 W3, rear 44217 W3. · P1 closed cockpit single-seat cars remain prohibited; rule moved from subsection J.5 to B.4. · P1 engine table reference corrected from 'above' to 'below'; ETC/FBW/DBW throttle wording clarified on sensor and fail-safe requirements. · P1 removes TIR inlet restrictor option; deletes requirement for single turbo/supercharger unit with single restrictor. · P1 CN-spec Honda K20A-FD2 clarified: stock OEM parts required, no machining allowed. · P1 engine rules correct grammar and remove head designs from specification table.show
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| Super Tour Apr 2018 BUTTRA182018-04-27 | 1:47.596John Yeatman · fastest of 3 · top 3 within 13.1s-1.154s (-1.06%) | 1:47.040Brandon Chappell · fastest of 3 · top 3 within 11.2s-1.159s (-1.07%) | 1:46.323Mike Anderson · fastest of 9 · top 5 within 2.1s+0.367s (+0.35%) | 1:45.954Mike Anderson · fastest of 9 · top 5 within 3.3s-0.317s (-0.30%) | -1.086squal -1.273s | 99.0%qual 98.8% | 1:38.997Chip Romer · fastest of 6 · top 5 within 7.8s+2.677s (+2.78%) | 1:37.111Chip Romer · fastest of 6 · top 5 within 13.4s-0.316s (-0.32%) | -9.929squal -8.599s | 90.7%qual 92.0% | |||||
| No rule changes on record between these events | |||||||||||||||
| Super Tour Apr 2017 BUTTRA172017-04-28 | 1:48.750Brandon Aleckson · fastest of 2 | 1:48.199Brandon Aleckson · fastest of 2 | 1:45.956Mike Anderson · fastest of 8 · top 5 within 2.0s | 1:46.271Mike Anderson · fastest of 10 · top 5 within 2.1s | -1.928squal -2.794s | 98.2%qual 97.4% | 1:36.320Jim Devenport · fastest of 5 · top 5 within 6.9s | 1:37.427Parker Nicklin · fastest of 5 · top 5 within 6.2s | -10.772squal -12.430s | 90.0%qual 88.6% | |||||
About this data
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 FE" is the class's best as a share of FE'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 FE'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.