Make of car
Allowed Replacement Parts
Updating and Backdating
"No Touch Rule"
Onboard Data Acquisition System
Spec Rx-7 racecars are intended to be dual purpose street and race
vehicles. The class was conceived with the intention that costs be
kept low while allowing close racing. To this end, these rules
will be vigorously enforced at all SCCA-sanctioned events. These
rules are absolute – they are not intended to be a guide to car
preparation. Unless specifically mentioned or approved in these
rules, no additional vehicle modifications may be made. Any
sections referring to the GCR or the IT/CS rules that has been
affected by an updating of those books, the most current versions
of the GCR & IT/CS rule books apply.
MAKE OF CAR
Mazda Rx-7, 1981-1985, equipped with 12A rotary engine. S, GS, or
GSL trim-level models are eligible.
All vehicles will remain Showroom Stock, as defined by SCCA
General Competition Rules (2000 GCR Sec. 17.1.3 and continued in
Showroom Stock Category Specifications) except for the following
specifically required and/or allowed modifications. Minimum
weight- 2530 lbs. with driver.
REPLACEMENT PARTS: Many of these items are available from
Mazda Competition Parts at 800-435-2508. All drivers should
register with them in order to purchase Mazda Original Parts
at a discount.
- 1. SHOCK ABSORBERS:
Brand: Tokico High Performance Gas
Model: Front #HZ-1069, Rear #HE-2317
Notes: Non adjustable, blue body
- 2. SWAY BARS:
Brand: Suspension Techniques
Notes: Front: 1 1/8",
fixed; Rear: 5/8", adjustable. (Note: In the rear you
may use the allowed replacement Suspension Techniques sway
bar, any 1981-1985 12A model Rx-7 stock sway bar or no sway
bar at all.)
- 3. SPRINGS:
Model: CSM-400 "Street/Race"
Notes: Blue color
- 4. AIR FILTER:
Model: Victoracer V700, 205/60R13
Notes: Must have "Kumho
Tire" designations on front and both sides
of vehicle to be
eligible for Kumho contingency. Contact Kumho at
for ordering tires, decals, and contingency
forms. When ordering
tires- mention you are part of So.Pac. Spec 7
drivers to get
special class pricing. Tires are also available at
Rack or Discount Tires (America’s Tires in L.A./O.C.
CA.) but pricing may be different.
Safety rules (seatbelts, window net, fire
extinguisher) as per SCCA GCR (sections 17, 18 and 20). All
other safety items as per I.T.C.S. rules Sect.
Roll cage: Brand: Autopower Model: 83591 RX
(1-3/4" ERW or 1-1/2" DOM material) Notes: Material
and construction defined by the SCCA GCR Sec. 18.2.
All cars must use specified roll cage which
shall not be modified, except for mounting window net and seat
belt mounting brackets, and will only be bolted in place.
Early model roll cages must be modified to
adhere to GCR 18.2.4.A, full horizontal bracing.
Outer dash vent louvers may be removed for
roll cage clearance where needed.
No gutting allowed. All interior components,
including carpeting, insulation and trim panels as installed
on the vehicle when new must remain, with the following
Driver's seat may be replaced with any
aftermarket seat. Seat back must be braced per Improved
Touring Category Specification (ITCS) 17.1.4.D.9.a. Stock
passenger seat must be retained.
Any steering wheel may be used, per ITCS
The radio/amplifier/speakers may be
The ash tray and cigarette lighter may be
The clock may be removed.
Gauges may be added, but shall only be
installed in the center console area previously occupied
by radio equipment.
Inside door handles and armrest
assembly/door pocket box may be modified/removed for roll
bar clearance. The remaining stock door trim panel must be
retained and may be recovered to hide holes or account for
wear. If the door pocket/armrest assembly is removed, the
door panel must be recovered to present a uniform
appearance. Trimming the height of / or replacement of the
door panel sub structure with alternate materials is not
The heater control panel must remain
intact and unmodified, and all controls must operate as
To facilitate seatbelt mounting, the stock
driver's side seatbelt may be removed.
The stock interior mirror may be replaced
with any aftermarket unit.
Interior trim items may be reupholstered
to account for wear
The following interior trim items may be
removed: sun visors, luggage straps, cargo box lids,
center console box lid. All other trim items must be
retained unless mentioned elsewhere in these rules.
To allow for the mounting of a fire
extinguisher on the center console, the early
"S" model coin tray assembly may be substituted
for the center console box & armrest assembly.
If ballast must be added to bring the car up
to minimum weight, it must be securely fastened to the floor
of the passenger footwell or under the passenger seat.
Cars may be repainted in non-factory colors.
Any exterior mirrors may be used, provided
they are fitted in the stock location.
Fender openings may be modified for tire
clearance per ITCS Section 17.1.4.D.8.a.
Emblems and side moldings may be removed.
Hood pins and windshield clips may be added
per ITCS Section 17.1.4.D.8.d.
The radio antenna may be removed. The
remaining hole must be covered.
All engine electrical components must remain
stock and unmodified, with the following specifically allowed
Any spark plugs may be used.
Any brand of spark plug wires may be used
of 9mm diameter or less, providing they are of the
original single-wire resistance type and do not include
external grounding wires or any means of charge or spark
Ignition coils may be replaced with any
coils that will mount in the stock location.
Ignition timing shall be stock (per
Distributor must remain unmodified.
Engine and drivetrain lubricants are free.
Cooling system must remain operable and
unmodified, with the exception of the following specifically
a. Radiator may be replaced with a larger
unit of the same type and material as the original, and must
mount in the original, unmodified location.
1983 and later cars may use the earlier
oil cooler system, providing the early radiator is used.
1981 and 1982 cars may use the later oil
cooling system, providing the later radiator is used.
Stainless steel braided oil lines may be used
for oil cooler.
A screen may be installed in front of the
radiator and oil cooler to help prevent stone damage.
Air conditioning, cold start assist system,
and cruise control components in the engine compartment may be
removed. No other modifications to the heating/cooling
ventilation system may be made.
Fuel system, including tank and filler, must
remain unmodified, with the exception of the following
specifically allowed modifications:
Fuel pumps and fuel pressure regulators
are free. Replacement fuel pumps must be mounted within
12" of the original location.
The fuel tank return line shall remain as
stock and shall not be used for fuel delivery to the
The stock fuel-return check valve and fuel
tank rollover valve may not be modified, bypassed or
Any fuel filter(s) may be used.
Carburetor must remain stock and unmodified
except for the following specifically allowed modifications:
"Grose Jet" carburetor needles
and seats may be used in place of stock carburetor needles
and seats, providing the replacements are of identical
size to stock.
The shutter-valve system may be disabled,
however the shutter-valve butterfly may not be removed or
Electrical charging system must be functional
and operating as per manufacturer's specifications.
Battery must be as stock, Group 24, 24F, or
24R, and mounted in the original location. Minimum battery
dimensions: H 7 1/4", W 6 1/2", L 9 ¾";
minimum weight: 24 lbs.
The main catalytic converter may be replaced
by any E.P.A. or C.A.R.B. approved aftermarket converter. The
converter fresh air system & pipe must be retained and
functioning as designed. The pre-converters may be removed and
replaced with 2-1/8" O.D. pipe.
To facilitate at-track inspections, a
flange must be installed at each end of the converter.
Exhaust is free after the converter, but must
exit from the stock location and extend to the rear bumper.
Maximum outside diameter for exhaust pipe is
A muffler is not required, but all vehicles
must meet sound standards per SCCA GCR Section 12.
The lower exhaust system heat shields may be
removed. All of the upper heat shields between the body and
the exhaust system must be retained.
Any stock style pressure plate and disc may be
used, provided the replacement is the same weight or greater
All vehicles not originally equipped as such
may be fitted with the entire rear-end assembly from a GSL
model (disc brakes and limited slip differential).
The differential ratio must be 3.9:1, using
stock 81-85 Mazda RX-7 factory gears.
No modifications to the stock differential are
The stock wheel lug-bolt system may be
replaced with wheel-studs and nuts.
Transmission must remain stock.
Any brake pad material or brake fluid may be
Braided steel brake lines may be used.
Adjustable brake-bias valves are allowed, but
must be installed in the engine compartment and must not be
driver adjustable from the cockpit.
If rear disc brakes are installed on a vehicle
not originally equipped with rear disc brakes, the master
cylinder and proportioning valve from a disc-brake car may be
installed. Otherwise, the brake master cylinder must remain
Front brake dust-shields may be modified or
Brake cooling is allowed per ITCS Section
17.1.4.D.6.b. A duct of 3" maximum diameter may be used
for brake cooling.
The plastic inner fender panels may be removed
Upper strut mounting holes may be slotted for
increased camber/castor. Upper center strut locating hole may
be modified to facilitate strut movement. Stock strut hat must
be used and cannot be modified for clearance.
All suspension bushings must remain stock and
unmodified, with the following exceptions:
Urethane front control arm bushings
(Energy Suspension part #11-03101) may be used.
Urethane strut rod bushings (Energy
Suspension part #11-7101) may be used.
Rear axle bump stops may be modified,
removed or replaced.
Stock rear sway-bar end links may be
replaced with Energy Suspension part #9-8123.
Front suspension rubber coil spacers may
A maximum of two spacers (Mazda part
#1011-34-013) may be added per side to the front strut
assemblies for weight balancing.
One stayrod may be added for chassis
stiffening between the front upper strut towers per ITCS
Minimum ground clearance measured at the front
cross-member shall not be less than 4 1/2".
Front wheel negative camber shall not exceed
1-1/4 degrees. No adjustments are allowed to the rear axle.
Any brand of 13" diameter wheel –
alloy, stock factory or steel – up to 7" wide may be
Wheel back spacing must be 4".
Minimum weight for wheel, tire, and lug
nuts is 26 lbs.
Wheel spacers may not be used.
UPDATING and BACKDATING
Exterior body parts, interior trim, engine,
drive shaft and rear axle may be exchanged or replaced with
another of years 1981 to 1985, 12A model vehicles.
Any component updating or backdating must be
done as an entire unit.
"NO TOUCH RULE"
The following components, or any part thereof,
may not be modified, detailed or massaged in ANY way:
Engine (including intake or exhaust ports
and all internal moving or stationary parts)
Carburetor (except as allowed in Section
Intake or exhaust manifold.
Any and all emission control devices
(except as allowed in 3.G.1).
No radio communication is allowed between driver and
crew, driver and pits, or between drivers
Onboard Data Acquisition System
No onboard electronic lap timing, lap counting or
data acquisition systems may be fitted to vehicles or used during
any official SCCA practice, qualifying, or race session. A
simple elapsed time/countdown timer (Kitchen type may be used as
long as its only function is to keep track of event duration.