F6 + FB + SRF + FX at Buttonwillow Raceway Park

In FX, Formula Mazda, add to the notes as follows:
"Marking tires is no longer required. Car must comply with all December 2019 GCR Formula Mazda
preparation rules found here: https://www.scca.com/downloads/48184-gcr-december-
2019/download."

In FX, GCR section 9.1.1.J.B, add the following:
"5. Ex-Pro Formula Super Vee - Shall comply with notes in Table 1."
In FX Table 1, classify the Ex-Pro Formula Super Vee as follows:
Table 1
Car Engine
Wheel
Width (in)
± .060
Aero Transmission Weight Notes

A specification table follows in the original; it is not shown here.

In FX, GCR section 9.1.1.J.B, add the following:
"6. FormulaSPEED - Shall comply with notes in Table 1"
In FX Table 1, classify the FormulaSPEED as follows:
In FA Table 2, remove FormulaSpeed2.0 (FS2.0) spec line in its entirety.
Table 1
Car Engine
Wheel
Width (in)
± .060
Aero Transmission Weight Notes

A specification table follows in the original; it is not shown here.

In SRF, GCR section 9.1.8.E.1.X.h, make changes as follows:
"Shock Absorbers: Penske shock P/N 280396 with spec valving shall be used as a sealed
assembly with no modification of any kind. If shock seals are damaged in any way, the
shock must be sent to an authorized SCCA Enterprises service center for verification and
resealing at the competitor’s cost. Beginning
05/01/2020 2019, the SCCA Enterprises bump rubber stop P/N 280407 may be used as
delivered with no modification of any kind; if used, maximum of one bump rubber stop per
shock. Effective 05/01/2020, only the SCCA bump stop P/N 280407 may be used as
delivered with no modification of any kind; if used, maximum of one bump stop per
shock.”

Thank you for your letter. The Club Racing Board will consider adding a spec line to FX Table 1 for
Formula Ireland/Formula FX cars once the relevant specifications have been received. The
Formula/Sports Racing Committee will forward a list of the specifications to be supplied by the letter
writer through the CRB letter log system.
Not Recommended

In FX, GCR section 9.1.1.J.B, add the following:
"7. Formula Ireland / Formula FX - Shall comply with notes in Table 1"
In FX Table 1, classify the Formula Ireland / Formula FX as follows:

In FX Table 1, FormulaSPEED (FS2.0) line, change the notes as follows:
"Must use sealed ECU map and sealed engine, FS2.0 sealed Ohlins TTX dampers, spec three-piece FS2.0 wheels with FS2.0 logo,
and spec FS2.0 intake manifold. No part of the car may be altered from FS2.0 original parts, except for repairs that do not affect
performance. World Speed Inc. must provide complete specifications by 04/30/2020. Car must comply with specifications found
here: https://www.scca.com/pages/technical-forms-and-downloads."

In SRF, GCR section 9.1.8.E.1.I, change as follows:
"NO MODIFICATIONS ALLOWED. Only SCCA Enterprises sealed Penske shocks P/N 280396 shall be used. Only front spring P/N
280387 or P/N RO28037 shall be used. Only rear spring P/N 280390 shall be used. Effective May 1, 2020, o Only the SCCA Bump
Stop P/N 280407 may be used, with no modification of any kind. Bump stops are optional. If used, only one bump stop per shock
is permitted."
"All shock absorbers must be sealed by SCCA Enterprises. Prior to sealing, the shock absorbers will shall be rebuilt
by SCCA Enterprises or its authorized rebuilders."
In SRF, GCR section 9.1.8.E.1.X, change as follows:
"c. Rear Springs: 412-429 lbs./in Enterprises P/N 280390 or previous Enterprises supplied part (ex.RO280388 or RO280389)."
"h. Shock Absorbers: Only the Penske shock P/N 280396 with spec valving shall be used as a sealed assembly, with no
modification of any kind. If shock seals are damaged in any way, the shock must be sent to an authorized SCCA Enterprises
service center for verification and resealing at the competitor’s cost. Effective May 1, 2020, o Only the SCCA Bump Stop P/N
280407 may be used, with no modification of any kind. Bump stops are optional. If used, only one bump stop per shock is
permitted."
"i. Ground Clearance: Minimum is 2.75 inches measured at the frame on the front and rear axle lines without driver, as raced."

In FX, GCR section 9.1.1.J.B, add the following:
"8. 2010–2017 Formula Renault 2.0 – Shall comply with notes in Table 1."

A specification table follows in the original; it is not shown here.

In SRF, GCR section 9.1.8.E.2.B, change as follows:
"Mandatory identification: "SRF3" near the side car numbers,. Approved (2) “Ford Performance” on each sideof the engine cover
plus a Ford Blue Oval on the center of the Nose & (2) “Performance Electronics” on eachside of the tail. "Hoosier" logo (4) on
both sides front lower outer corners of the nose, and each side of the tail."

TB: In FX, GCR section 9.1.1.J.B, add the following:
"9. 2000-2009 Formula Renault 2.0 / Fran-Am 2000 - Shall comply with notes in Table 1."
In FX Table 1, classify the 2000-2009 Formula Renault 2.0 / Fran-Am 2000 as follows:
butterfly shaft. All intake air shall pass through the required restrictors and
the throttle body or carburetor body. Intake manifold for either
carburetion or injection shall have individual runners connecting one
throttle plate to one rotor, only. No balance tubes or other device shall
connect runners between rotors.
G.
Mazda 13B
Streetport
Rotary n/a n/a
One (1) 2-bbl auto-type carb or throttle body. Intake manifold shall have
individual runners connecting one throttle plate/butterfly to one rotor,
only. No balance tubes or other devices shall connect runners between
rotors.
44mm 1230
H. Mazda 13B
Rotary NA NA Peripheral Port 36mm SIR 1230
I. E.
Ford
Duratec/
Mazda MZR/
Ford Duratec
1615 4 2.0L engine destroked to 1615cc n/a 1175
J. F.
Ford
Duratec/
Mazda MZR/
Ford Duratec
2296 4 Maximum compression permitted 14.0:1 30mm SIR 1375

A specification table follows in the original; it is not shown here.

In SRF, GCR section 9.1.8.E.2.H.17, add the following:
"Alternator Pulley: P/N G902130 or P/N G902130A. 12oz minimum weight"

In FX Table 1, USF2000 Tube Frame spec line, change the notes as follows:
"Car must comply with FRP MAZDA MZR F2000 Technical Specifications (2018) except that any Hoosier radial tire measuring 20.5
x 7.0 x 13 (front) and 22.5.x 8.0 x 13 (rear) may be used."

In SRF, GCR section 9.1.8.E.1.X.f, make changes as follows:
"Dry:
Front – Hoosier P/N 46340 P185/60ZR13 SRF
Rear – Hoosier P/N 46350 P205/60ZR13 SRF
Wet:
Front – Hoosier P/N 46100 P185/60R13 H20
Rear – Hoosier P/N 46105 P205/60R13 H20
or
Front – Hoosier P/N 46100 P185/60R13 W2 (effective Oct. 4, 2021)
Rear – Hoosier P/N 46105 P205/60R13 W2 (effective Oct. 4, 2021)"

In SRF, GCR section 9.1.8.E.2.K, make changes to gear ratios as follows:
"Gear Ratios:
Ford/Mazda OEM 5-Speed:
1st 3.42 : 1
2nd 1.84 : 1
3rd 1.29 : 1
4th 0.97 : 1
5th 0.77 : 1
Final Drive Ratio: 3.85
OR
SADEV-SRF3 6-Speed Sequential (beginning Oct. 4, 2021):

A specification table follows in the original; it is not shown here.

In FX Table 1, USF2000 Tube Frame spec line, change the notes as follows:
"Car must comply with FRP MAZDA MZR F2000 Technical Specifications (2018) found here,
https://www.scca.com/pages/technical-forms-and-downloads, with the following exceptions. except that a Any Hoosier radial
tire measuring 20.5 x 7.0 x 13 (front) and 22.5.x 8.0 x 13 (rear) may be used. Spec sealed Dynamics 1640 shock absorbers may be
replaced with any shock absorber that complies with the current FC rules. Spec PFC brakes may be replaced with Wilwood
Calipers No. 120-13863-N (right) and No. 120-13864-N (left) and Wilwood Pad No. 150-14781K. Spec Mazda spark plugs may be
replaced with Bosch spark plug Part No. F 000 KEO P45 7ZB."

In SRF, GCR section 9.1.8.E.1.C, make changes as follows:
"If any official Enterprises seal is broken, by an Enterprises Customer Service Rep. (CSR) emergency field repair, accident, or
intent, the procedures outlined under C.20., section S shall be followed. Parts with an Enterprises part number having the prefix
"10" are considered to be unrestricted, providing provided their dimensions are comparable."
In SRF, GCR section 9.1.8.E.1.S, make changes as follows:
"SCCA Enterprises' seals on engine are required for all races must be present on driveline components in designated locations for
all SCCA sanctioned events. Any competitor who runs participates in an event without all proper engine seals in the required
locations shall have his engine removed and shipped to Enterprises for testing and sealing after that event must remove his
unsealed component and it must be inspected by a Customer Service Rep. (CSR) or Enterprises. Notation shall be made in the
vehicle logbook and seals checked prior to the next event. The competitor will be responsible for all cost incurred by this
procedure. regardless of the findings, and If the component is found to be out of specification, the competitor is subject to
penalty by the SOM if engine is found to be not as specified."
"SCCA Enterprises' seals are required on all SPEC RACER FORD engines and transmissions."

In SRF, GCR section 9.1.8.E.1.X.f, change as follows:
"Wet:
Front – Hoosier P/N 46100 P185/60R13 H20
Rear – Hoosier P/N 46105 P205/60R13 H20
Ground clearance is 2.5" with driver as raced when H20 tires are used.
or
Front – Hoosier P/N 46100 P185/60 65R13 W2 (effective Oct. 4, 2021)
Rear – Hoosier P/N 46105 P205/60R13 W2 (effective Oct. 4, 2021)"
In SRF, GCR section 9.1.8.E.2.H.24, change as follows:
"Air Box: P/N G592230 Mandatory unmodified As delivered, except as noted under body work, Air Box floor vent must remain
open and un-obstructed."
In SRF, GCR section 9.1.8.E.2.H, add a new section as follows:
"25. SRF3 Restrictor plate: P/N G301048 As delivered, installed between throttle body and intake manifold. Mandatory Jan. 1,

A specification table follows in the original; it is not shown here.

In FX, GCR section 9.1.1.J.B.1, change as follows:
"Formula Mazda – Shall comply with GCR 9.1.1.E (2019) notes in Table 1."
In FX Table 1, Formula Mazda spec line, change the notes as follows:
"Marking tires is no longer required. Car must comply with all December2019 GCR Formula Mazda preparation
rules specifications found here: https://www.scca.com/downloads/48184-gcr-december-2019/download FormulaMazda-FM-
Rules."
**Attach new document to site link.**

In FX, GCR section 9.1.1.J.B.2, add the following:
"Formula 4 – Shall comply with FIA Formula 4 Technical Regulations (2015) and all subsequent safety requirements as issued by
the FIA and/or SCCA, except that tire choice is unrestricted."
In FX Table 1, FIA Certified F4 spec line, change the notes as follows:
"Upon request, competitors must provide a copy of the rules in effect when the car was certified by the FIA. Tire choice is
unrestricted."

In FX Table 1, USF2000 Tube Frame spec line, change the notes as follows:
"Any Hoosier radial tire measuring 20.5 x 7.0 x 13 (front) and 22.5. x 8.0 x 13 or 22.0 x 8.0 x 13 (rear) may be used."

In FX Table 1, Formula Renault 2.0 (10-17) spec line, add the following:
"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."
In FX Table 1, Formula Renault 2.0 (00-09)/Fran-Am 2000 spec line, add the following:
"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."

In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Tires: must be run as delivered."

In SRF, GCR section 9.1.8.D.1.X.g, change as follows:
"Brakes: Hawk Blue 9012 pads P/N 801993 must be used. Wilwood vented rotor P/N 800065 shall be used as delivered with no
machining of any kind. Minimum thickness 13.25 12.20mm (0.522 0.481"). The 1985 Renault Alliance solid front rotor (Reference:
Bendix PRT1318 or Centrix 121.11004) may be used on front, rear, or both axles, but each axle must be paired to the same type
rotor. Rubber caliper bushings may be replaced with bronze bushings P/N 1196185 or P/N 1196185."
In SRF, GCR section 9.1.8.D.2.H, change as follows:
"No performance M modifications of any kind.
SCCA Enterprises’ seals shall be intact.
(2) on cam cover, (2) on the oil pan, (1) on the each cam shaft. Automatic Drivetrain Violation if removed."
In SRF, GCR section 9.1.8.D.2.H.23, change as follows:
"Air Filter: P/N WM301020 or K&N RC-9160"

In FX Table 1, Formula Renault 2.0 (10-17) spec line, change the notes as follows:
"The CRB may require a Flat Plate Intake Restrictor or reclassify the car at any time 45mm Flat Plate Intake Restrictor is
required. Fairings before or after the restrictor are prohibited."

In FX Table 1, USF2000 Tube Frame spec line, add to the notes as follows:
"ECU: Either the Pectel T2 ECU or the Performance Electronics PE3-8400 is required. Cars that use the Pectel T2 ECU must have an
accessible and operable communications port for a stereo jack; cars that use the PE3-8400 ECU must have an accessible and
operable communications port for an ethernet connection. The SCCA tune-file/map for the Pectel T2 and PE3-8400 on the official
SCCA website is required. The PE3-8400 tune-file/map must be loaded with PE3-8400 Monitor firmware V3.04.50. Competitors
may be required to cycle the master switch to kill the engine at the request of a steward on the grid before a qualifying session or
race."

In FX Table 1, Pro Formula F2000 Tube Frame spec line, change as follows:
"Up to 5 4 F forward G gears, L limited S slip D differential (sequential C carries a 25 lb. W weight P penalty)"

In FX Table 1, Formula Mazda spec line, add to the notes as follows:
"The following exception applies: Minimum weight is 1270 lb.”

In FX Table 1, Formula Mazda spec line, change the engine as follows:
"Six (6) port Mazda 13B or four (4) port Mazda Renesis"
In FX Table 1, Formula Mazda spec line, change the weight as follows:
"1350 with six (6) port 13B, 1400 with four (4) port Renesis See notes"

In FA Table 2, add a new spec line as follows:
Table 2
Car Engine Wheel
Width
(in)
± .060
Aero Transmission Weigh

A specification table follows in the original; it is not shown here.

In GCR section 1.4.2.D, change as follows:
"It is preferable not to combine FA, FB, F C, FE, and or FM FX with FV and/or F600."

In SRF, GCR section 9.1.8.D.X.g, change as follows:
"Brakes: Hawk Blue 9012 pads P/N 801993 must be used. Wilwood vented rotor P/N 800065 shall be used as delivered with no
machining of any kind. Minimum thickness 12.20mm (0.481"). The 1985 Renault Alliance solid front rotor (Reference: Bendix
PRT1318 or Centrix 121.11004) may be used on front, rear, or both axles, but each axle must be paired to the same type
rotor. The Renault Alliance solid front rotors may not be used. Rubber caliper bushings may be replaced with bronze bushings P/N
1196185 or P/N 1196185. Original caliper pistons may be replaced with vented caliper piston P/N 1196184; no other
modification allowed. Wilwood caliper with bracket universal fit P/N 800038 may be used as delivered with no modification of
any kind. Wilwood knock back spring (2.63 lbs.) P/N 800045 may be used as delivered with no modification of any kind;
maximum of one spring per caliper."
P2 Engine Table
Spec
Line Engine Series

A specification table follows in the original; it is not shown here.

In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Front – Hoosier P/N 46100 1 P185/65R13 W2"

In SRF, GCR section 9.1.8.D.1.X.f, change as follows:
"Wet:
Front – Hoosier P/N 46100 P185/60R13 H20 or W2
Rear – Hoosier P/N 46105 P205/60R13 H20 or W2
Ground clearance is 2.5" with driver as raced when P185/60R13 (H20 or W2) tires are used."

RM 23-07, USF2000 Van Diemen with Mazda MZR LF-DE 2.0L in FC, GCR section 9.1.1.B.1, add a new section and re-letter the
following sections accordingly:
"c. The USF2000 tube frame Van Diemen car powered by the Mazda MZR LF-DE 2 liter engine is added as a "spec line" car in
Formula Continental. Additional "spec line" cars are disfavored, and Balance of Performance (BoP) adjustments to keep "spec
line" cars competitive with cars that meet the class formula are likewise disfavored."
In FC, GCR section 9.1.1.B.11, add the following:
"The only permitted engines are:
a. The Ford 2 liter single overhead camshaft "NE" series engine or the 1971-74 Pinto/Capri 2 liter single overhead camshaft
engine. The specifications are contained in B.15.
b. The Ford Zetec ZX3 2 liter dual overhead camshaft engine. The specifications are contained in B.16.
c. The Mazda MZR LF-DE 2 liter for use only in USF2000 cars, as described in the Spec Line Cars Table below."
In FC, GCR section 9.1.1.B, add the following:
In FX, GCR section 9.1.1.J.B, change as follows and renumber the remaining lines accordingly:
"3. USF2000 (tube frame) – Shall comply with FRP F2000 Technical Specifications (2018)
4. Pro Formula F2000 (tube frame) – Engine must be prepared to current FC rules."
In FX Table 1, remove the USF2000 Tube Frame and Pro Formula F2000 Tube Frame spec lines in their entirety.
Spec Line Cars Table

A specification table follows in the original; it is not shown here.

In SRF, GCR section 9.1.8.D.1.V.j, change as follows:
"Radiator - Enterprises new style P/N 480465 (requires baffle P/N 480464) or P/N 480466 can be used. P/N 480466, may can be
replaced with Automotive P/N 1R698, CU698 or equivalent OEM manufacturer justified by one cross-reference chart equivalent,
as long as the size, shape, and material are the same as the original P/N. The capacity, core thickness, etc., cannot be changed
even if allowed under the above. The competitor is responsible for providing this documentation of the cross-reference P/N."

In FX Table 1, Formula Mazda spec line, replace the specifications referenced in the notes as follows:
***See attached***

In SRF, GCR section 9.1.8.D.1.W.l, change as follows:
"A Super Bright LEDs Inc. rain / brake light comprised of a single standard trailer oval lamp, 2-1/4 inches x 6-1/2 inches, with
incandescent or LED illumination, P/N PT-STRB-R24, is required in the original roll hoop mounting location. This rule supersedes
GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024. No changes may be made to the original 3-pin connector on the
wiring harness. The secondary filament of the brake light assembly shall must be connected to a switch enabling its use as a rain
light."

In SRF, GCR section 9.1.8.D.1.W.l, change as follows:
"A Super Bright LEDs Inc. P/N PT-STRB-R24 (SCCA Enterprises P/N 180427A) rain / brake light, P/N PT-STRB-R24, is required in the
original roll hoop mounting location. This rule supersedes GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024. No
changes may be made to the original 3-pin connector on the wiring harness. An SCCA Enterprises P/N 1190503 Strobing Brake
Light Pigtail is required. The secondary filament of the brake light assembly must be connected to a switch enabling its use as
a strobing rain light. A Strobing Brake Light Kit P/N 1168003 is available, which includes the brake light and pigtail."

In SRF, GCR section 9.1.8.D.1.H, add the following:
"NO MODIFICATIONS ALLOWED. Front brake ducts are required, attached to the openings in the lower radiator baffles, any
flexible 4" duct material allowed, installed length minimum 12" maximum 36" in length. Must be securely fastened, Bracket Part
# P/N 800368 can be used. Shall Must serve no other purpose. An extension may be welded to the side of the throttle pedal to
improve heel-and-toe braking. Master cylinder casting / location must be used as delivered on P/N 180110 Pedal Mounting
support. Aeroquip style -3 braided stainless flex lines only, must attach to all brake components without modification. Brake pad
"anti-rattle" clips must be removed."
In SRF, GCR section 9.1.8.D.1.V, add the following:
"ii. Rear SADEV shift cable aluminum two-piece style clamp may be used. The P/N WM302007A clamp must serve no other
purpose."
In SRF, GCR section 9.1.8.D.1.X.k, add the following:
"Negative camber shall must not exceed 5.0 degrees absolute maximum front and rear."
In SRF, GCR section 9.1.8.D.1.AA.b, add the following:
"2. Height of the radiator opening vertical surface 3 1/2“ +/- 1/2"."
P2 Engine Table B.1
2008 and older Stock
Suzuki, Yamaha,
Honda, BMW
38.5mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 38.5mm
Modified
Engine
950 lbs.
1005cc max
P2 Engine Table B.1
2008 and older 37mm
P2 Engine Table B.2 Not required
P2 Engine Table B.3 39mm
Stock Engine
1050 lbs.