BoP Lab / Buttonwillow Raceway Park
This track has been raced on 4 configurations (The Circuit, 2.57 mi; 2.92 mi; 1.83 mi; 3.02 mi). Laps on different configurations are not comparable, so only events on the 2.57 mile layout are shown; switch above to see the others.
7 laps are left out as timing errors (far too short to be a lap of this track). The rest of those sessions, sectors included, is used.
| Pos | Car | Driver | Class | # | Lap | Theoretical | Qual | Race | 5-lap stint | Consistency | Trap | S1 | S2 | S3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Elan Pro Formula Mazda | Greg Labadie 2+ cars | FA | 35 | 1:14.588 D-Q2 | 1:14.588 D-Q2 | ||||||||
| 2 | Swift 016 | Greg Labadie 2+ cars >115% | FA | 35 | 1:35.792 A-Q1 | 1:35.351 | 1:35.792 A-Q1 | 1:37.275 A-R1 | 1:37.692 A-R1 | +3.958 A-R1 | 163.8 A-R1 | 26.713 A-Q2 | 26.816 A-Q1 | 41.822 A-Q1 |
| 3 | Mazda Miata | Joe Carr | EP | 12 | 1:52.034 B-P | 1:52.034 | 1:59.603 A-Q1 | 1:59.157 A-R1 | 1:59.373 A-R1 | +0.724 A-R1 | 131.6 A-R1 | 31.719 B-P | 32.405 B-P | 49.966 B-P |
| 4 | Mazda MX-5 | Glen McCready | EP | 4 | 1:53.088 B-Q2 | 1:52.984 | 1:53.088 B-Q2 | 1:53.487 B-R2 | 1:54.617 B-R2 | +2.232 B-R2 | 125.6 B-P | 30.761 B-R2 | 32.765 B-Q1 | 49.458 B-Q2 |
| 5 | Mazda RX-7 | Kurt Frietzsche | EP | 40 | 1:56.468 B-Q1 | 1:55.599 | 1:56.468 B-Q1 | 1:56.573 B-R1 | 1:57.721 B-R1 | +1.914 B-R1 | 120.7 A-R2 | 31.324 B-Q1 | 34.071 B-R1 | 50.204 B-R1 |
| 6 | Mazda RX-7 | Brandon Droese | EP | 02 | 1:56.943 B-Q1 | 1:56.657 | 1:56.943 B-Q1 | 1:58.611 B-R1 | 1:58.767 B-R1 | +0.718 B-R1 | 94.1 B-Q1, B-R1 | 31.953 B-R1 | 33.891 B-Q1 | 50.813 B-Q1 |
| 7 | BMW E30 | Sean Lovett | EP | 37 | 2:00.712 A-Q2 | 2:00.625 | 2:00.712 A-Q2 | 2:01.864 A-R2 | 2:02.200 A-R1 | +0.528 A-R1 | 127.6 A-Q2 | 32.761 A-Q1 | 34.806 A-Q1 | 53.058 A-Q2 |
| 8 | Porsche Boxster | William Robinson | EP | 198 | 2:01.940 A-Q1 | 2:01.634 | 2:01.940 A-Q1 | 2:02.887 A-R1 | 2:03.347 A-R1 | +1.312 A-R1 | 130.6 A-Q2 | 32.969 A-Q1 | 35.257 A-Q1 | 53.408 A-Q1 |
| 9 | Mazda MX-5 | Whitfield Gregg | EP | 17 | 2:03.660 B-Q2 | 2:03.314 | 2:03.660 B-Q2 | 2:04.085 B-R1 | 2:05.470 B-R2 | +2.529 B-R2 | 97.7 B-R2 | 33.862 B-R2 | 35.422 B-R1 | 54.030 B-Q2 |
One row per driver and car (a driver who changed cars has a row for each). Each cell is that driver's best in that car across the selected events, with the session it was set in. Best 5-lap stint is the mean of the driver's quickest five consecutive race laps, and consistency is how far their median race lap sat behind their best in that race (small is a driver who does it every lap); both come from the race with the best stint. The fastest in each column is purple, and a car whose best lap is more than 115% of the fastest in its class is greyed (marked ">115%" beside the driver) and left out of the colour scale. Click a column to sort, a row to highlight it. Theoretical lap is the sum of the best sectors, whichever laps they came from, and never slower than the best lap (where a car's fastest laps were recorded without sector times, its best lap is used). The 115% mark is about the car's best lap only: a car whose best lap is within 115% of the fastest in its class is never marked. Greyed sectors with no theoretical lap mean the sector times on file do not add up to a believable lap. Letters refer to the events above; Q is qualifying, R a race.
Sectors are numbered in lap order from start/finish, whatever each event's timing called them; the loop names are SCCA timing's.
| Car | Class | Drivers | Lap | Qual | Race | Trap | S1 | S2 | S3 |
|---|---|---|---|---|---|---|---|---|---|
| Pro Formula Mazda | FA | 1 | 1:14.588Greg Labadie | 1:14.588Greg Labadie | |||||
| Swift 016 | FA | 1 | 1:35.792Greg Labadie | 1:35.792Greg Labadie | 1:37.275Greg Labadie | 163.8Greg Labadie | 26.713Greg Labadie | 26.816Greg Labadie | 41.822Greg Labadie |
| Mazda Miata | EP | 1 | 1:52.034Joe Carr | 1:59.603Joe Carr | 1:59.157Joe Carr | 131.6Joe Carr | 31.719Joe Carr | 32.405Joe Carr | 49.966Joe Carr |
| Mazda MX-5 | EP | 2 | 1:53.088Glen McCready | 1:53.088Glen McCready | 1:53.487Glen McCready | 125.6Glen McCready | 30.761Glen McCready | 32.765Glen McCready | 49.458Glen McCready |
| Mazda RX-7 | EP | 2 | 1:56.468Kurt Frietzsche | 1:56.468Kurt Frietzsche | 1:56.573Kurt Frietzsche | 120.7Kurt Frietzsche | 31.324Kurt Frietzsche | 33.891Brandon Droese | 50.204Kurt Frietzsche |
| BMW E30 | EP | 1 | 2:00.712Sean Lovett | 2:00.712Sean Lovett | 2:01.864Sean Lovett | 127.6Sean Lovett | 32.761Sean Lovett | 34.806Sean Lovett | 53.058Sean Lovett |
| Porsche Boxster | EP | 1 | 2:01.940William Robinson | 2:01.940William Robinson | 2:02.887William Robinson | 130.6William Robinson | 32.969William Robinson | 35.257William Robinson | 53.408William Robinson |
The best any driver of each car managed across the selected events, with who set it. Spellings and model years of the same car are grouped; click a row marked ▸ to see each version. Grouping is worked out from the names, so tell us if two cars are wrongly merged or split.
#33343 from Tim Schreyer · Rule change · TB 23-01 (2023-01 Fastrack)
Effective 4/1/2023 In EP Spec Line BMW Z3 2.5L, change Notes as follows:
"58 56mm Flat Plate Intake Restrictor is required with both stock or alternate throttle body."
#34085 from Club Racing Board · Rule change · TB 23-05 (2023-05 Fastrack)
In FA Table 2, Pro Formula Mazda spec line, change as follows:
"The overall maximum width of the bodywork behind the front wheels shall not exceed 132cm (51.17 51.97 inches)."
#34139 from Club Racing Board · Rule change · TB 23-05 (2023-05 Fastrack)
RM 23-06 – MSR - FMzR Formula Atlantic Classification dated 4/21/2023
In FA Table 2, add a spec line as follows:
#34185 from Kip VanSteenburg · Rule change · TB 23-06 (2023-05 Fastrack)
In EP Spec Lines, Porsche 914 - 6 2.0L, change Valves IN & EX mm/(in.) as follows:
"(I) 41.9 2.0/(1.65)
(E) 38.1 0/(1.50)"
#34190 from Club Racing Board · Rule change · TB 23-06 (2023-06 Fastrack)
In FA, Pro Formula Mazda spec line, change wheel width as follows:
"Pro Mazda series wheels
A specification table follows in the original; it is not shown here.
#34419 from Production Committee · Rule change · TB 23-06 (2023-05 Fastrack)
In FP Spec Lines, Austin-Healey Sprite Mk. I, II,III, IV MG Midget Mk I,II, III, IV & 1500, change Intake Valve Size as follows:
"(I) 36.65.3/(1.44)"
In FP Spec Lines, Triumph Spitfire Mk. IV & 1500, change Intake Valve Size as follows:
"(I) 36.65.5/(1.440)"
In HP Spec Lines, Triumph Spitfire 1500, change Intake Valve Size as follows:
"(I) 36.65.5/(1.440)"
In HP Spec Lines, Triumph Spitfire Mk. III & IV 1500, change Intake Valve Size as follows:
"(I) 36.65.5/(1.440)"
#34649 from Jeff young · Rule change · TB 23-09 (2023-09 Fastrack)
In the EP Spec Lines, Triumph TR8 (78-81), remove the following wording from Notes:
"Alternate front hubs are allowed provided they are of the same external dimensions as stock and weigh no less than the stockhubs."
#34662 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)
In EP Spec Lines, Triumph GT6, change Carburetor. No. & Type as follows:
"(2) 1.5” SU or Stromberg Auto-type carburetor(s)"
#34663 from ANTHONY PARKER · Rule change · TB 23-09 (2023-09 Fastrack)
In EP Spec Lines, Triumph GT6, add the following to Brakes Alt.: mm/(in.):
"(F) Calipers & discs from TR-6 (std. or alt)"
#35002 from Adam Achepohl · Rule change · TB 23-12 (2023-12 Fastrack)
In EP Spec Lines, delete the Porsche 944/924S 2.5L (2V) (83-88) spec line entirely, and create a new spec line for Porsche
944/924S 2.5L(2V) 2.7L(2V) (83-89) as follows:
A specification table follows in the original; it is not shown here.
#35054 from ANTHONY PARKER · Rule change · TB 23-12 (2023-12 Fastrack)
In EP Spec Lines, Triumph GT6, change weight as follows:
"1830 1800"
#35073 from Tim Schreyer · Rule change · TB 24-01 (2024-01 Fastrack)
In EP spec line, BMW Z3 2.5L, change weight as follows:
"2450 2500
*2511 2563
**2573 2625"
#35253 from Don Tucker · Rule change · TB 24-01 (2024-01 Fastrack)
In EP Spec Lines, Mazda MX-5 /Miata 1.8L (90-97), change weight as follows:
"2200 2150"
Mazda MX-5 /Miata (94-97)
"2035 2000
*2086 2050
**2137 2100"
Applies to Mazda Miata on this page: Joe Carr
Applies to Mazda MX-5 on this page: Glen McCready, Whitfield Gregg
#35255 from Anthony Parker · Rule change · TB 24-01 (2024-01 Fastrack)
In EP spec line, Triumph GT6, make the following change in the Notes section:
"Two (2) 1.75” auto-type carburetors @ 1970 40 lbs. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990
lbs. Laycock overdrive, May use 5 speed gearbox w/o overdrive. Three (3) Weber 40mm DCOE w/28mm venturi on individualrunner manifold @ 2020 lb."
#35272 from Aaron Johnson · Rule change · TB 24-01 (2024-01 Fastrack)
In EP spec line, Honda S2000, make the following changes to its spec line:
Fuel Injected Equipped Throttle Body Inside Diameter: "62 64"
Notes: "Comp. Ratio limited to 12.0:1. Valve lift limited to .500”. An adaptor plate can be used to mount the 62mm throttle body
from '00-05 to the '06-09 intake manifold. The adaptor plate can be no more than 1.25" thick, and its bore must not exceed the
"Fuel Injected Equipped Throttle Body Inside Diameter" maximum spec of 64mm."
#35315 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)
In EP spec line, Triumph TR8 (78-81), move the "Dry sump allowed" wording to the appropriate location as follows:
Carburetor. No. & Type: “Zenith Stromberg carbs or fuel injection. Dry sump is allowed.”
Notes: “Comp. Ratio limited to 12.0:1, Valve lift limited to .500”. Dry sump is allowed.”
#35317 from Production Committee · Rule change · TB 24-01 (2024-01 Fastrack)
In EP spec line, Porsche 944/924S 2.5L (2V) / 2.7L (2V) (83-89), change Weight as follows:
A specification table follows in the original; it is not shown here.
#35399 from Enrik Benazic · Rule change · TB 24-02 (2024-01 Fastrack)
In HP, make the following weight change:
Honda Civic 1.5 (88-91)“2245 2175
*2301 2229
**2357 2284”
#35623 from Production Committee · Rule change · TB 24-03 (2024-03 Fastrack)
In HP Spec Lines, delete the following redundant spec lines in their entirety:
Spec line #10 - VW Rabbit Cabriolet 1780
Spec line #3 - VW Scirocco 1588
Spec line #4 - VW Scirocco 1780 (8-valve) (83-88)
Spec line #5 - VW Scirocco 1588
#35830 from Murphy Nichols · Rule change · TB 24-06 (2024-06 Fastrack)
In EP Spec Lines, classify Nissan 300ZX (84-89), as follows:
A specification table follows in the original; it is not shown here.
#36031 from Edward Zabinski · Rule change · TB 24-06 (2024-06 Fastrack)
Mazda RX-7 (92-97) as follows:
A specification table follows in the original; it is not shown here.
#36156 from Production Committee · Rule change · TB 24-06 (2024-06 Fastrack)
Spec Lines, make the following changes to the two Mazda RX-8 spec lines.
Remove spec line entirely:Mazda RX-8 (04-11)
Remove the wording "alternate":
Mazda RX-8 (04-11)(alternate)
Spec Mazda (SM/SMX) None.
#36231 from Angus Crome · Rule change · TB 24-08 (2024-08 Fastrack)
In HP Spec Lines, change Track (F/R)mm/(in.) as follows:
Volkswagen Golf (GTI, GT, GL) (85-92): "2 1537/1529 (60.5/60.2)"
Volkswagen Jetta (GLI, GL) (85-92): "2 1537/1529 (60.5/60.2)"
#36518 from Darryl Saylor · Rule change · TB 24-09 (2024-09 Fastrack)
In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1275cc, change Notes as follows:
"(Effective 11/1/2024) Compression ratio limited to 11 12.0:1"
In HP Spec Lines, Austin-Healey Sprite MkI, II, III, IV MG Midget (ALL) - Level 2 - 1098cc, change Notes as follows:
"(Effective 11/1/2024) Compression ratio limited to 11 12.0:1"
#36902 from Production Committee · Rule change · TB 24-11 (2024-11 Fastrack)
In EP Spec Lines, Track (F/R) mm/(in.), change as follows:
Mazda MX-5 /Miata 1.6L (-1993) - "1478/1491 (58.2/58.7) 1516/1534 (59.7/60.4)"
Mazda MX-5 /Miata 1.8L (90-97) - "1483/1509 (58.4/59.4) 1516/1534 (59.7/60.4)"
Mazda MX-5 /Miata (94-97) - "1483/1509 (58.4/59.4) 1516/1534 (59.7/60.4)"
#37112 from Anthony Parker · Rule change · TB 24-12 (2024-12 Fastrack)
In EP Spec Lines, make the following changes in the "Triumph GT6" spec line:
Carburetor No. & Type: (2): "1.5” 1.75" Auto-type carburetor(s)"
Notes: "Two (2) 1.75” auto-type carburetors @ 1940 lbs. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990
lbs. Laycock overdrive, May use 5 speed gearbox w/o overdrive."
#37119 from Tim Schreyer · Rule change · TB 25-01 (2025-01 Fastrack)
In EP SPEC LINES, BMW 325i/is (E30) (84-91), change Weight as follows:
"2200 2150
*2255 2204
**2310 2258"
#37658 from Club Racing Board · Rule change · TB 25-02 (2025-02 Fastrack)
In FA Table 2, add the following:
Table 2 (Spec Line Cars)
Car Engine
Wheel
Width (in)
± .060
Aero Transmission Weight Notes
A specification table follows in the original; it is not shown here.
#37654 from Doug Piner · Rule change · TB 25-02 (2025-02 Fastrack)
In EP Spec Lines, add to Notes as follows:
BMW Z3 2.5LL "(Effective 2/21/2025) 52mm Flat Plate Intake Restrictor is required."
BMW Z3 2.8L (97-00): "(Effective 2/21/2025) 55mm Flat Plate Intake Restrictor is required."
BMW 328i/is E36 (96-99): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required."
BMW 328i/ci E46 (01-06): "(Effective 2/21/2025) 58mm Flat Plate Intake Restrictor is required."
BMW 325i/is E46 (01-06): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
BMW 325i/is E-36 (92-95): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
BMW 325is M-Technic (1994): "(Effective 2/21/2025) 56mm Flat Plate Intake Restrictor is required."
#37120 from Tim Schreyer · Rule change · TB 25-01 (2025-01 Fastrack)
In EP Spec Lines, change Notes as follows:
BMW Z3 2.5LL "(Effective 3/1/2025) 56mm 52mm Flat Plate Intake Restrictor is required."
BMW Z3 2.8L (97-00): "(Effective 3/1/2025) 59mm 55mm Flat Plate Intake Restrictor is required."
BMW 328i/is E36 (96-99): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required."
BMW 328i/ci E46 (01-06): "(Effective 3/1/2025) 62mm 58mm Flat Plate Intake Restrictor is required."
BMW 325i/is E46 (01-06): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
BMW 325i/is E-36 (92-95): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
BMW 325is M-Technic (1994): "(Effective 3/1/2025) 60mm 56mm Flat Plate Intake Restrictor is required."
#37235 from Lawrence Slivinski · Rule change · TB 25-03 (2025-03 Fastrack)
In GCR, add new rule as Section 9.1.5.E.10.f:
"Any interior or exterior mirror(s) that meets rule 9.3.36 may be used."
#37466 from Michael Unger · Rule change · TB 25-03 (2025-03 Fastrack)
In EP, Spec Lines make the following weight changes:
A specification table follows in the original; it is not shown here.
#37488 from Joe Carr · Rule change · TB 25-03 (2025-03 Fastrack)
In EP Spec Lines, make the following weight change:
Mazda MX-5 /Miata (99-05):
"2150 2100
*2204 2153
**2258 2205"
#37853 from Club Racing Board · Rule change · TB 25-03 (2025-03 Fastrack)
In FA Table 2, Formula Renault 2.0 (10-17) spec line, change the notes as follows:
"Engine must remain sealed. Car must comply with year-specific Formula Renault 2.0 manual, technical regulations, and all
applicable bulletins found here:. Competitors must have copies of these materials in their possession and present them upon
request.https://sites.google.com/a/renault-sport.com/formule-renault-2-0-en/bulletins-techniques/2017,https://sites.google.com/a/renault-sport.com/formule-renault-2-0-en/manuel-d-utilisateur/2017.
The following exceptions apply: Tire choice is unrestricted. No part of the car may be altered from original Formula Renault 2.0
components, except for necessary repairs that do not affect performance."
#37755 from Kristian Smith · Rule change · TB 25-04 (2025-04 Fastrack)
In HP Spec Lines, classify the Chevrolet Spark (16-22):
A specification table follows in the original; it is not shown here.
#37939 from Doug DeRonne · Rule change · TB 25-04 (2025-04 Fastrack)
In HP Spec Lines "Ford Festiva (88-93)" change as follows:
Weight:
"1700 1600
*1743 1640
**1785 1680"
Notes:
"Compression ratio limited to 10.5 11.0:1. Valve lift limited to .450”."
#38255 from Matthew Brannon · Rule change · TB 25-06 (2025-06 Fastrack)
In HP Spec Lines, change Weight as follows:
Fiat X-1/9 & Bertone1500: “1790 1740 *1835 1784 **1880 1827”
Fiat X-1/9 1300: “1650 1600 *1691 1640 **1733 1680”
Fiat X-1/9 1300: “2060 2010”
Fiat X-1/9 1500: “1950 1900”
#38434 from Rocco Magni · Rule change · TB 25-07 (2025-07 Fastrack)
In FA Table 2, FR Americas Ligier JS F3 spec line, change the notes as follows:
"Engine must be sealed in compliance with FR Americas or prior F3 Americas requirements. Car must comply with FR Americas
rules, with the following exception: front tires may be Hoosier P/N 43363, size 240/580R13 in MS compound, and rear tires may
be Hoosier P/N 43368, size 300/590R13 in MS compound. Competitors must have current copies of Formula Regional Americas
Championship Sporting Regulations, Onroak Automotive Ligier JS F3 Information Manual, and HPD engine-related specifications
and instructions in their possession and present them upon request."
#38490 from Bryce McGuire · Rule change · TB 25-07 (2025-07 Fastrack)
In EP Spec Lines, BMW Z4 (03-05), add to Notes the following:
“52mm Flat Plate Intake Restrictor.”
#38498 from John Baucom · Rule change · TB 25-07 (2025-07 Fastrack)
In EP Spec Lines, Fiat 124 Sport Spider 1600 & 124 Spider 2000, change as follows:
Weight: "2050 2000"
Carburetor No. & Type: "(2) Weber 40 IDF-40IFI, (2) Solex C40P116, 34 36mm choke(s) req’d, (2) Weber 45DCOE w/ 34 36 mm
choke(s) on I.R. manifold or fuel injection."
#38995 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
In HP Spec Lines, Plymouth Arrow (76-80), add the following wording to Trans. Speeds(max):
"4 or 5"
#39008 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
In Appendix G.2.3, change as follows:
"Rim width and diameter are is absolute maximums."
#39009 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
In GCR, Section 9.1.5.E., change as follows:
9.1.5.E.1.b.4: "The inside dimensions of the throttle body casting/housing (as measured at the throttle butterfly) must remain
stock (tolerance of +/-.25mm), but the throttle body can otherwise be ported and polished."
9.1.5.E.2.b.4: "The inside dimensions of the throttle body casting/housing and all dimensions of the throttle butterfly must
remain stock (tolerance of +/-.25mm)."
#38783 from Augie Pabst · Rule change · TB 25-09 (2025-09 Fastrack)
Effective 11/1/25 in FA Table 2, add the following:
#38871 from Matthew Miller · Rule change · TB 25-09 (2025-09 Fastrack)
In EP Spec Lines, Nissan 280Z, change Weight (lbs) as follows:
"(Effective 11/1/2025) 2560 2400
*2624 2460
**2688 2520"
#38949 from Don Tucker · Rule change · TB 25-10 (2025-10 Fastrack)
In EP Spec Lines, Mazda MX-5 / Miata 1.8L (90-97), Effective 11/1/2025 make the following weight change:
"2150 2125"
#38970 from Kendall Jones · Rule change · TB 25-10 (2025-10 Fastrack)
In HP Spec Lines, Austin-Healey Sprite/Midget 1098cc, Effective 11/1/2025make the following weight change:
"1630 1550"
#38994 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
In HP Spec Lines, Volvo 142/142E P-1800 Engine, Effective 11/1/2025 add the following wording to Notes:
"Comp. Ratio limited to 12.0:1. Valve lift limited to .425”."
#38996 from Production Committee · Rule change · TB 25-10 (2025-10 Fastrack)
In HP Spec Lines, Mini Cooper (07-13) (includes 09-15 convertible and 12-15 Coupe), Effective 11/1/2025 make the following
changes to the Notes:
"Compression ratio limited to 11.0:1, Valve lift limited to .450”.390"."
#39019 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
In FP Spec Lines, make the following spec line correction:
"Volkswagen Rabbit (Includes Convertible Cabriolet)"
In HP Spec Lines, make the following spec line correction:
"Volkswagen Rabbit 1588 (Includes Cabriolet)"
"Volkswagen Rabbit 1715 (Includes Cabriolet)"
"Volkswagen Rabbit 1780 (Includes Cabriolet)"
#39025 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
In GCR, Section 9.1.5.E.7., change as follows:
"e. Cars fitted with rear drum brakes, can convert to rear disc brakes without penalty. Note that the “Brakes Std.” and “BrakesAlt.” listings on a vehicle’s spec line do not prohibit a car that was fitted with rear drum brakes stock, from converting to reardisc brakes under this rule. When converting from rear drum brakes to rear disc brakes:
1. Rear brake rotors must be solid and can be no larger in diameter than the largest permitted front brake rotor, as defined on
the vehicle’s spec line.
2. Rear calipers and mounting brackets are unrestricted but must be made of a ferrous or aluminum material. The standard andalternate brake listings on a vehicle’s specification line, does not prohibit a car that was fitted with rear drum brakes as stock
from converting to rear disc brakes under this rule.
3. The “Brakes Std.” and “Brakes Alt.” listings on a vehicle’s spec line do not prohibit a car that was fitted with rear drum brakes
as stock from converting to rear disc brakes under this rule."
#39130 from Production Committee · Rule change · TB 25-11 (2025-11 Fastrack)
In EP Spec Lines, Ford Mustang (94-98) add the following to the Fuel Injected Equipped Throttle Body Inside Diameter column:
"60"
#39180 from Anthony Parker · Rule change · TB 25-12 (2025-12 Fastrack)
In EP Spec Lines, Triumph TR2, 3, 3A, 4, 4A, TR4, TR4A, IRS, make the following change to the Notes:
"Front apron assembly may be made of alternate material. Three (3) Weber 40 DCOE on IR manifold with 28mm chokes @ 1990lbs. Laycock overdrive, may use 5 speed gearbox without overdrive."
#39187 from Jim Simaras · Rule change · TB 25-12 (2025-12 Fastrack)
In EP Spec Lines, make the following changes to Restrictors:
BMW Z3 2.5L: "52mm 50mm Flat Plate Intake Restrictor"
BMW Z3 2.8L (97-00): "55mm 53mm Flat Plate Intake Restrictor"
BMW 328i/is E36 (96-99): "58mm 55mm Flat Plate Intake Restrictor"
BMW 328i/ci E46 (01-06): "58mm 55mm Flat Plate Intake Restrictor"
BMW 325i/is (E46) (01-06): "56mm 53mm Flat Plate Intake Restrictor"
BMW 325is M-Technic (1994): "56mm 53mm Flat Plate Intake Restrictor"
BMW 325i/is E-36 (92-95): "56mm 53mm Flat Plate Intake Restrictor"
In EP Spec Lines, BMW Z3 2.5L, change Weight as follows:
"2500 2550
*2563 2614
**2625 2678"
#38223 from Ove Olsson · Rule change · TB 26-01 (2026-01 Fastrack)
In FA, GCR section 9.1.1.2.d, modify as follows:
"9. Intake manifold must be unmodified Elan DP02-60-003 or Mazda Speed equivalent Elite USF2015AT, 1.882” maximum bore
diameter at throttle plates. Elan or Mazda Speed equivalent Elite intake manifold may be replaced with unmodified intake Noor
P/N 0088-8-00 with intake runners AT Power P/N 13624."
"10. Elan DP02-60-003 or Mazda Speed equivalent Elite USF2015AT intake manifold must use an A aluminum spacer must beused between the intake manifold and cylinder head castings; minimum spacer length is 2.200”."
#39302 from Reilly Harris · Rule change · TB 26-01 (2026-01 Fastrack)
In FA Table 2, Formula 1000 spec line, change the Engine as follows:
"Motorcycle-based 4-cycle up to 1000cc, maximum compression ratio 14.5:1;. o Otherwise, current FA engine rules apply."
#39363 from Tim Schreyer · Rule change · TB 26-01 (2026-01 Fastrack)
In EP Spec Line BMW 325i/is E30 (84-91), change Drivetrain Notes as follows:
"Fuel Injection, TB: 60mm"
#39608 from Club Racing Board · Rule change · TB 26-01 (2026-01 Fastrack)
In FA Table 2, Formula 1000 spec line, change the Notes as follows:
"Car must comply with December 2019 GCR Formula 1000 (FB) Preparation Rules, https://www.scca.com/downloads/48184-
gcr-december-2019/download, except as modified by this spec line. The prohibition of using carbon fiber in any external panels
or any panels licked by the airstream in Part 3.C of the December 2019 GCR F1000 (FB) Preparation Rules is removed, with the
exception that the car's floor pan/undertray must comply with the requirements of Part 2.D of the December 2019 GCR F1000
(FB) Preparation Rules. The prohibition of forward-facing gaps or openings in the bodywork in Part 3.I of the December 2019 GCR
F1000 (FB) Preparation Rules is removed. Part 3.D of the December 2019 GCR F1000 (FB) Preparation Rules is modified as
follows: "Between the rear of the front tire and the front of the rear tire, no point on the lower surface of the car (the surface
licked by the air stream) shall be more than 125mm above the plane determined by the reference area designated by the entrant
and on a line perpendicular to that reference plane." Part 3.D of the December 2019 GCR F1000 (FB) Preparation Rules is also
modified as follows: "A maximum of eight (8) rub blocks of maximum dimension 75mm by 125mm are allowed anywhere on the
lower surface of the chassis and may extend below the reference plane." Part 3.E of the December 2019 GCR F1000 (FB)
Preparation Rules is modified as follows: "The radius of transitions between the diffuser sides and adjacent horizontal structures
may be up to 75mm. The width of the diffuser, as measured between its sides and above any radiused transitions, may not
exceed 110cm in any lateral section." The CRB may require the use of Flat Plate Intake Restrictors at any time."
#39411 from Stephen Lamana · Rule change · TB 26-02 (2026-02 Fastrack)
In FA Table 2, Pro Formula Mazda spec line, change the notes as follows:
"All current FA rules apply to areas not covered by this spec line. Apex seals unrestricted. Street port or bridge port
allowed. Unmodified OEM l Lower intake manifold required unrestricted, upper intake manifold unrestricted. Balance tube not
permitted. Fuel injection only. Maximum 70 80mm T throttle B body. The maximum height of the wing and/or
endplates shall must not exceed 99cm (38.98 inches). The overall maximum width of the bodywork behind the front
wheels shall must not exceed 132cm (51.97 inches)."
What the rules allowed changed as listed; this does not say what any particular car ran.