12 February, 2003, v2.0

944-SPEC Racing Series ™

Official National Rules

1 Definition and Claim

The Porsche 944™-924S™ spec class will be a class for those individuals that wish to race a Porsche in a competitive series with limited expense and low cost of operation. The following are approved and disapproved items for the class. The spirit of the class is for all cars to be equal in weight and horsepower and be competitive with one-another. The focus will be on driver ability and not dollar ability.

The mark Porsche is recognized as registered to Porsche Cars North America with the United States Trademark and Patent Office.

2 Intent

The intent of these rules is to provide mandates to ensure that all vehicles are constructed and modified within clearly established limits, so as to ensure an even platform, in which a contest of driving skill may provide the most talented drivers with great rewards.

3 Purpose

The purpose of this series is to provide a stage to showcase driving talent.

4 Format

No modifications, addition or removal of parts is allowed, unless specified or approved in these rules. No additional modifications are permitted. These rules are not intended as guidelines; rather they shall serve as the national set of rules, and must be strictly followed. The Region is responsible for ensuring that all competitors running in the corresponding regional championship conform to these rules. All rules and regulations are subject to change and no disputes are allowed as long as they pertain to the competitiveness of the class.

5 Eligible Models

1983-1988 Porsche 944, Normally Aspirated 2479 cc

1987-1988 Porsche 924S, 2479 cc

6 Sanctioning Body

The 944-SPEC Racing Series™ is sanctioned by National Auto Sport Association (NASA). All events are governed by these rules, applicable addendums, prima fascia rules, as well as those found in the latest version of the NASA Club Codes and Regulations © (CCR). All decisions made by the series administration are final, except under certain conditions, as specified by the CCR.

7 Safety

7.1 General

All safety standards not specified herein shall conform to the NASA Club Codes and Regulations (CCR). Where conflicts between the rules found in the CCR and these rules, these rules shall supercede the conflicting rules found in the CCR. However, in the interest of safety, any participant that determines a conflict exists shall immediately report it to the series administration, for clarification.

7.2 Roll Cages

Roll Cages must mount to the chassis with no more the six points and cannot mount past the firewall. The front four mounts must be either on the floor or the doorsill of the car.

7.3 Electrical cutoff switches are highly recommended but are not required.

8 Decals

8.1 All 944-SPEC racecars are required to permanently affix specified decals and logos. This is in addition to any decals required per the NASA CCR. Series sponsor decals may also be required.

9 Measurements

9.1 Specified Measurement

Whenever the manufacturer or these rules do not specify a measurement, the common average measurement will be used. This common average measurement shall be determined by either 1) calculating a mean average of at least three measurements from the corresponding parts found on other vehicles, or 2) the series technical administrator will make a determination based on any other reasonable method, providing that the data, system, or logic that was used be made known to the public. The second option is only permitted under circumstances where option number one becomes impractical, as determined by the series Race Director.

9.2 Tolerances

All published measurements infer a tolerance of +/- one-half of the last specified decimal place. All rounding will be done to the nearest decimal place that is specified by the manufacture or these rules. In a case where a measurement falls exactly on the halfway mark, it shall be rounded up or down in favor of the competitor. This section does not apply whenever the manufacturer, or these rules, specifies a tolerance.

10 Weight

10.1 Minimum - Vehicle

All minimum weight* requirements must be met immediately following all qualifying sessions and races. 2600 pounds including the driver.

Additional Weight - Ballast

Additional weight may be added to the vehicle providing that all of the following conditions are met:

10.1.1 Additional weight shall serve no other purpose than to increase the weight of the vehicle. This additional weight shall be known as “ballast.”

10.1.2 Ballast shall be made of solid metal, and must be installed securely. All ballast must be secured using at least one 3/8-inch grade 5 bolt, two ‘fender washers’, and a locking nut system for every ten pounds of weight. Example: A seven-pound block requires at least one bolt system as described herein. A 30-pound block requires at least a three-bolt system.

10.1.3 All pieces of ballast must be bolted through the floor pan on the passenger side of the cockpit, no further rearward than the front holes of the seat bolts.

11 Engine

11.1 General

All engines, components, and parts must have been offered for sale in a Porsche 944 from model years 1983-1988 with 2.5-liter eight-valve engines only, sold by a dealer in the United States of America. All engines and their internal components must remain stock, except as provided by these rules, and within factory specified tolerances. Cars may be updated and backdated with parts from the Porsche 944 and 924S from model years 1983-1988 with 2.5-liter eight-valve engines only.

11.2 Any competitor may file a protest against another competitor’s engine by submitting a $100 protest fee. At that time the race director will tag and secure all mechanical and electronic items in question. The owner of the vehicle will then be required to make his car available for testing. If this is refused the competitor will be disqualified of all race points.

11.3 Balancing

Balancing and lightening of engine parts and engine components is not permitted except for rebuild purposes only. An example would be turning a crank to repair damage.

11.4 Cooling System

Ethylene glycol-based anti-freeze is prohibited. Use of other additives, such as Redline Water Wetter is permitted.

11.5 Radiator

Stock radiator required.

11.6 Maximum compression ratio is 11:1 for all eligible model years. Cylinder heads may be shaved to achieve an 11:1 compression ratio.

11.7 Thermostat

Thermostats are required.

11.8 Oil Cooling

The factory oil cooler may be removed and an external oil cooler installed. The intent of this rule is to fix the known problem of inadequate factory designed oil coolers which can cause an oil/water mixing problem. This can easily be done with factory parts from a 944 Turbo.

12 Induction / Exhaust / Fuel Systems/Engine Management

12.1 Throttle Body

Must remain stock with no modifications.

12.2 Air Filter

No restrictions.

12.3 Fuel Filler

Must remain stock.

12.4 Ignition System

Any spark plug, spark plug wires may be used. Any initial ignition timing may be used.

12.5 Computer Engine Management System

The stock computer engine management system must remain. No other engine management system may be added. Aftermarket tuner chips may be used.

12.6 Exhaust System

Free from head back.

13 Transmission / Differential

13.1 Clutch

Any clutch disc and clutch cover (pressure plate) may be used, providing they mount on an unmodified flywheel.

13.2 Differential

The ring and pinion must remain stock, which is 3.889 final drive ratio.

13.2.1 Welded differentials are approved. Any limited slip is approved.

13.2.2 Gearing must remain stock for the Porsche 1983-1988 944 naturally aspirated and 924S models.

14 Suspension Components

14.1 All suspension components must be mounted in factory original mounting locations and of the original factory design.

14.1.1 Shocks
All shocks may not have more then two external adjustments. Remote reservoir shocks are not permitted. Threaded body shocks similar to the factory Mo30 package are allowed on the front only. Shocks must be original factory installed shocks or the following models and part numbers:

Koni

Front: 8641-1038 Sport, 8641-1414 Sport

Rear: 26-1209 Sport, 8040-1035 Sport

Bilstein

Front P30-0104, AK1110, AK1111

Rear: B36-0161, B36-2052

14.1.2 Shock tower braces are allowed. No modification of the shock tower is allowed. The brace must bolt on.

14.1.3 Springs

Any rate is permissible in the factory original location only. Coilover systems are not allowed in the rear. Any torsion bar size approved up to 30mm.

14.1.4 Sway Bars

Any sway bars permissible as long as they are not cockpit adjustable.

14.2 Ride Height

All Models: Any ride height, providing that no metal part of the vehicle touches the ground so as to be hazardous in the opinion of the Race Director.

14.3 Suspension bushings must remain non-metallic.

14.4 Steering

Manual or power steering may be used. Power steering rack may be converted to manual. The steering lock may be removed.

14.5 Rims

15 x 7 inch ATS or Phone Dial stock wheels only. The Race Director may approve other wheels.

14.6 Tires

In the spirit of competitiveness the following size and model is the spec tire as of December 1, 2002:

225/50/15 Toyo RA1

NOTE: Competitors may still be allowed to participate on other tires but will not be awarded points or prizes. They still must affix the Toyo Tire stickers to their cars regardless.

14.7 Camber Plates

Camber plates are allowed provided they bolt into the chassis using existing shock mounting holes and when set to their center position must not change the angle of the shock from it’s factory position. No modification to the sock tower is allowed.

15 Brake System

15.1 Brake pads are unrestricted.

15.2 Steel braided brake lines may be used.

15.3 Disc brake backing plates may be removed.

15.4 The emergency brake level and/or cables and associated parts may be removed.

15.5 Any non-synthetic brake fluid is allowed.

15.6 Air may be vented through fog light area in front air dam for brake cooling.

15.7 Any stock sized rotor is permitted.

15.8 All brake calipers must remain in stock configuration.

15.9 ABS is NOT allowed on any model year, even if installed by the factory.

16 Appearance

16.1 Exterior must have a clean and neat appearance. No car can be raced in primer or with filler material exposed.

16.1.1 No air dams, wings or spoilers are allowed other than stock components. Modification of front air dam to enhance cooling is permitted.

16.1.2 Fenders and wheel openings shall remain unmodified. The front fender liners may be removed.

16.1.3 Any mirrors may be used.

16.1.4 Any paint scheme / colors may be applied

16.1.5 Body molding, antennas, license plates, license plate frames, license plate lights, and insignias and emblems may be removed.

16.1.6 Hood clips are permitted. Stock hood latches may be disabled or removed.

16.2 Interior

16.2.1 The driver’s seat may be replaced with any seat suitable for competition, including a racing-type bucket seat. If the driver’s seat is replaced, factory seat tracks may be modified, reinforced or removed to facilitate replacement mountings provided they perform no other function. All driver seats shall conform to the CCR.

16.2.2 Factory instruments must remain intact. Additional gauges may be added. It is recommended the remainder of the dashboard and instrument panel remain intact. ADVISORY: It should not be necessary to remove any part of the dashboard to meet minimum weight.

16.2.3 Any steering wheel and attachments may be used except wood rimmed type steering wheels.

16.2.4 Any shift knob may be used.

16.2.5 The air conditioning system may be removed. The heater core and blower fan assembly may be modified or removed.

16.2.6 All interior items may be removed except where otherwise noted. The driver’s side floor mat must be removed.

16.2.7 All insulating material may be removed from the interior.

16.2.8 Ducting may be added to provide fresh air to the driver/passenger compartment, providing that no modifications of the body structure are made to accommodate this addition.

16.2.9 The passenger seat, mounting hardware, and seat belts may be removed.