Make of car
Preparation Rules
     Allowed Replacement Parts
     Safety Equipment
     Updating and Backdating
     "No Touch Rule"
Radio Communication
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.

    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.

    1. ALLOWED 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.


    Brand: Tokico High Performance Gas
    Model: Front #HZ-1069, Rear #HE-2317
    Notes: Non adjustable, blue body

    2. SWAY BARS:

    Brand: Suspension Techniques
    Model: 3-054
         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:

    Brand: TMC
    Model: CSM-400 "Street/Race"
    Notes: Blue color

    4. AIR FILTER:

    Brand: K&N
    Model: E-2700

    1.  TIRES:

      1. Brand: Kumho
        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
            (888) 77-KUMHO 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 
            The Tire Rack or Discount Tires (America’s Tires in L.A./O.C.
            CA.) but pricing may be different.


      1. 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. 17.1.4.D.10.a.1-5,b, d-i

      2. 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.

      3. 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.

        1. Early model roll cages must be modified to adhere to GCR 18.2.4.A, full horizontal bracing.

        2. Outer dash vent louvers may be removed for roll cage clearance where needed.


      1. No gutting allowed. All interior components, including carpeting, insulation and trim panels as installed on the vehicle when new must remain, with the following allowed exceptions:

        1. 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.

        2. Any steering wheel may be used, per ITCS 17.1.4.D.9.b.

        3. The radio/amplifier/speakers may be removed.

        4. The ash tray and cigarette lighter may be removed.

        5. The clock may be removed.

        6. Gauges may be added, but shall only be installed in the center console area previously occupied by radio equipment.

        7. 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 allowed.

        8. The heater control panel must remain intact and unmodified, and all controls must operate as originally intended.

        9. To facilitate seatbelt mounting, the stock driver's side seatbelt may be removed.

        10. The stock interior mirror may be replaced with any aftermarket unit.

        11. Interior trim items may be reupholstered to account for wear

        12. 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.

        13. 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.

      2. 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.


      1. Cars may be repainted in non-factory colors.

      2. Any exterior mirrors may be used, provided they are fitted in the stock location.

      3. Fender openings may be modified for tire clearance per ITCS Section 17.1.4.D.8.a.

      4. Emblems and side moldings may be removed.

      5. Hood pins and windshield clips may be added per ITCS Section 17.1.4.D.8.d.

      6. The radio antenna may be removed. The remaining hole must be covered.

    2. ENGINE

      1. All engine electrical components must remain stock and unmodified, with the following specifically allowed modifications:

        1. Any spark plugs may be used.

        2. 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 boost.

        3. Ignition coils may be replaced with any coils that will mount in the stock location.

        4. Ignition timing shall be stock (per manufacturer’s specifications).

        5. Distributor must remain unmodified.

      2. Engine and drivetrain lubricants are free.

      3. Cooling system must remain operable and unmodified, with the exception of the following specifically allowed modifications:

          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.

          1. 1983 and later cars may use the earlier oil cooler system, providing the early radiator is used.

          2. 1981 and 1982 cars may use the later oil cooling system, providing the later radiator is used.

      4. Stainless steel braided oil lines may be used for oil cooler.

      5. A screen may be installed in front of the radiator and oil cooler to help prevent stone damage.

      6. 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.

      7. Fuel system, including tank and filler, must remain unmodified, with the exception of the following specifically allowed modifications:

        1. Fuel pumps and fuel pressure regulators are free. Replacement fuel pumps must be mounted within 12" of the original location.

        2. The fuel tank return line shall remain as stock and shall not be used for fuel delivery to the carburetor.

        3. The stock fuel-return check valve and fuel tank rollover valve may not be modified, bypassed or removed.

        4. Any fuel filter(s) may be used.

      8. Carburetor must remain stock and unmodified except for the following specifically allowed modifications:

        1. "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.

        2. The shutter-valve system may be disabled, however the shutter-valve butterfly may not be removed or modified.

      9. Electrical charging system must be functional and operating as per manufacturer's specifications.

      10. 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.

    3. EXHAUST

      1. 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.

        1. To facilitate at-track inspections, a flange must be installed at each end of the converter.

      2. Exhaust is free after the converter, but must exit from the stock location and extend to the rear bumper.

      3. Maximum outside diameter for exhaust pipe is 2-1/8" O.D.

      4. A muffler is not required, but all vehicles must meet sound standards per SCCA GCR Section 12.

      5. 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.


      1. Any stock style pressure plate and disc may be used, provided the replacement is the same weight or greater as original.

      2. 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).

      3. The differential ratio must be 3.9:1, using stock 81-85 Mazda RX-7 factory gears.

      4. No modifications to the stock differential are allowed.

      5. The stock wheel lug-bolt system may be replaced with wheel-studs and nuts.

      6. Transmission must remain stock.

    5. BRAKES

      1. Any brake pad material or brake fluid may be used.

      2. Braided steel brake lines may be used.

      3. Adjustable brake-bias valves are allowed, but must be installed in the engine compartment and must not be driver adjustable from the cockpit.

      4. 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 unmodified.

      5. Front brake dust-shields may be modified or removed.

      6. 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.

      7. The plastic inner fender panels may be removed or modified.


      1. 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.

      2. All suspension bushings must remain stock and unmodified, with the following exceptions:

        1. Urethane front control arm bushings (Energy Suspension part #11-03101) may be used.

        2. Urethane strut rod bushings (Energy Suspension part #11-7101) may be used.

        3. Rear axle bump stops may be modified, removed or replaced.

        4. Stock rear sway-bar end links may be replaced with Energy Suspension part #9-8123.

        5. Front suspension rubber coil spacers may be removed.

      3. A maximum of two spacers (Mazda part #1011-34-013) may be added per side to the front strut assemblies for weight balancing.

      4. One stayrod may be added for chassis stiffening between the front upper strut towers per ITCS Section 17.1.4.D.5.d.5.

      5. Minimum ground clearance measured at the front cross-member shall not be less than 4 1/2".

      6. Front wheel negative camber shall not exceed 1-1/4 degrees. No adjustments are allowed to the rear axle.

      7. Any brand of 13" diameter wheel – alloy, stock factory or steel – up to 7" wide may be used.

        1. Wheel back spacing must be 4".

        2. Minimum weight for wheel, tire, and lug nuts is 26 lbs.

      8. Wheel spacers may not be used.


      1. 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.

      2. Any component updating or backdating must be done as an entire unit.

    8. "NO TOUCH RULE"

      1. The following components, or any part thereof, may not be modified, detailed or massaged in ANY way:

        1. Engine (including intake or exhaust ports and all internal moving or stationary parts)

        2. Transmission.

        3. Carburetor (except as allowed in Section 3.F.8).

        4. Intake or exhaust manifold.

        5. Any and all emission control devices (except as allowed in 3.G.1).

        6. Vacuum lines.

        7. Drive pulleys.

  4. Radio Commnuication

    1. No radio communication is allowed between driver and crew, driver and pits, or between drivers

  5. Onboard Data Acquisition System

    1. 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.