F5 + FB + SRF + F500 at Buttonwillow Raceway Park

In SRF, GCR section 9.1.8.E.1.V, add the following:
"ii. Dash Windscreen Kit, P/N 1180103 or P/N 180102, is allowed."

In the F500 engine table, change the weight as follows:
Honda CBR600RR (03-13): "875 900"
In the F500 engine table, change the weight as follows:
Suzuki GSXR600 (03-13): "875 900"
In the F500 engine table, change the weight as follows:
Yamaha R6 (03-13): "875 900"

In SRF, GCR section 9.1.8.E.1.V.s delete section in its entirety as follows and re-letter as follows:
"It is forbidden to regroove tires."
In SRF, GCR section 9.1.8.E.1.X.f, add new sections as follows:
"Tires:
Dry:
Front – Hoosier P/N 46340 P185/60ZR13
Rear – Hoosier P/N 46350 P205/60ZR13 SRF
Wet:
Front – Hoosier P/N 46100 P185/60R13 H20
Rear – Hoosier P/N 46105 205/60R13 H20
1. It is forbidden to regroove tires.
2. The use of tire warmers or cooling methods other than natural air convection or conduction is
prohibited. The penalty for violation will be the loss of qualifying times and/or the disqualification of race
results."

In SRF, GCR section 9.1.8.E.1.E.a, change the minimum weight as follows:
"Front 35 32 lbs."

In SRF, GCR section 9.1.8.E, make changes as follows:
"SPEC RACER FORD 3 (SRF/SRF3)"
In SRF, GCR section 9.1.8.E.1, make changes as follows:
"SPEC RACER FORD 2 (SRF) Regional Only Class"
In SRF, GCR section 9.1.8.E.2, make changes as follows:
"SPEC RACER FORD 3 (SRF3)"
In SRF, GCR section 9.1.8.E.2.A, make changes as follows:
"It is the intent of the SRF3, GEN3 a Ford 1.6L conversion, to update the current 1.9L SRF drivetrain for
class longevity. SRF and SRF3 shall compete side by side, for respective points and championships."

In SRF, GCR section 9.1.8.D.1.W.l, change as follows as approved by BoD on 9/12/2023:
"This rule supersedes GCR section 9.3.32.B.2 effective 1/1/2024 through 12/31/2024."

In the F500 engine table, change the restrictor as follows:
Honda CBR600RR (03-13): "29 28mm Flat Plate Intake Restrictor"
In the F500 engine table, change the restrictor as follows:
Suzuki GSXR600 (03-13): "29 28mm Flat Plate Intake Restrictor"
In the F500 engine table, change the restrictor as follows:
Yamaha R6 (03-13): "29 28mm Flat Plate Intake Restrictor"
Table 1
Car Engine Wheel
Width (in)
± .060
Aero Transmission Weight Notes
USF2000
Tube
Frame
2.0 Liter
Mazda MZR
See notes See notes See notes See
notes
Car must comply with the 2012
Pro USF2000 rules. Competitors
must have the current rules in their
possession and present them upon
request. The following sections of
the 2012 Pro rules do not apply:
14.1.1 thru 14.1.4; 14.12.2 thru
14.12.13; 14.13.1; 14.13.2; 14.13.5;
14.18 in its entirety; 14.19 in its
entirety; 14.27 in its entirety; 13.34 in
its entirety

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. After reviewing the response to the WDYT published in the May 2020 Fastrack
Minutes, the Club Racing Board does not recommend this change.

Thank you for your letter. Please see the response to letter #28359 in this Fastrack.

Thank you for your letter. Please see the response to letter #28359 in this Fastrack.

In the F500 engine table, update as follows:
"Suzuki GSXR600 (03-13 19)"

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 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."

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 F500, GCR section 9.1.1.D.14, Snowmobile Derived Engines, add the following:
"Rotax 593 in a carbureted, non-HO or HO version;"
In F500, GCR section 9.1.1.D.14.A, add the following:
"38mm intake boots, BPP 420867860 (last 6 digits 867860 are embossed on the boot), BPP 420867862 (last 6 digits 867862 are
embossed on the boot), or Kimpex 07-100-33, shall be used for the 493 and 593 non-HO engines. 38mm intake boots, BPP
420867882 (last 6 digits 867882 are embossed on the boot) shall be used for the 2003 593 HO engine, and BPP 420867879 (last 6
digits 867879 are embossed on the boot) shall be used for the 2004-2007 593 HO engines."
In F500, GCR section 9.1.1.D.14.I.3, add the following:
"Rotax 593 non-HO (0.010" overbore): Rotax P/N 420889171"
In F500, GCR section 9.1.1.D.14.J.3, add the following:
"Rotax 593 non-HO engine only: Rotax OEM 0.010" overbore piston (P/N 420889171)."
In F500, GCR section 9.1.1.D.14.K, add the following:
"Rotax 593 non-HO engine only:"
In F500 Engine Table, add the following:
F500 Version/Model Weight
(lbs) Inlet Restrictor Outlet Restriction Notes
Rotax
593*
Carbureted HO
version (03-07) 875 MA0242SP1020A
or
MA0242SP1063A
Y-pipe exhaust
manifold and single
expansion chamber (ref
9.1.1.D.14.B)
Note 1 and 4. Restrictor size and
type is to be displayed by the
following designation: 593 RSTR

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 F5, GCR section 9.1.1.D.6.B.4, make changes as follows:
"All gear changes must be initiated and made completed by the driver. Only mechanical gear shifting mechanisms are permitted.
This may include cables, rods, or other mechanical linkage systems. All other shifting mechanisms are not permitted. This
prohibition shall include electric solenoid shifters, air-shifters, etc. and other devices not mechanically actuated and controlled
completely by the driver. Devices that allow pre-selected gear changes and closed-loop systems that use feedback from sensors
to vary the timing of the gear selection process are also prohibited.
Devices that interact with the throttle, ignition, or fuel system during a shift operation (for example: ignitions cuts, flat shifters,
blippers) are permitted, but no such devices shall remove the driver's control of the gear change initiation, gear selection or
completion. The burden of proving that a device is in compliance with this rule shall be upon the competitor."

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 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 F5, GCR section 9.1.1.D.1, change as follows:
"A class for single seat, open wheel, rigid limited suspension race cars using either a snowmobile-derived engine and drive
components or a 600cc motorcycle engine."

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 F5, GCR section 9.1.1.D, add a new section as follows:
"19. All F5 cars competing in Majors Races and the Runoffs must have the AIM part #X47KPFSOLO2R0 data box mount installed
on the vehicle to provide the necessary mounting of the AIM Solo or Solo 2 data box. The mounting surface is to be approximately
oriented either horizontally or vertically either parallel or perpendicular to the longitudinal axis of the car and must be accessible
from the exterior of the car with the driver on board -- it should have a view of the sky and not be located under carbon fiber or
metallic bodywork. Sufficient space should be left between the mounting plate and the surface to which it is attached to permit
the use of zip ties/tie straps to restrain the data box to the mounting plate. The purpose of this requirement is to allow the
random placement of data boxes on cars on pre-grid by SCCA assigned personal and the collection of the box when the car exits
the race track. Contact AIM and their distributors for direct purchase."