Here are the relevant rules for NHRA certified tracks for street cars.

NHRA Sport Compact 2007 rulebook PDF download here.
2007 Rulebook revisions here.

My summary:

1.3 Exhaust: All street stock must be equipped with functioning mufflers and may be required to meet maximum decibel levels at certain facilities.

1.12 Supercharger: Screw type supercharger prohibited.

1.15 Vent Tubes, Breathers: Tubes must terminate into a permanently attached catch tank with min capacity of 1 gallon. NHRA may introduce mandatory breather systems on all nitrous injected and/or boosted engines.

2.4 Driveline: All RWD 13.99 or quicker with slicks and 11.49 or quicker with street tyres must have a tailshaft loop.

2.5 Flywheel: Stock cast type flywheels prohibited for cars running 11.49 or quicker. Must use SFI Spec 1.1, 1.2, 1.3 or 1.4.

2.10 Flywheel shield: 11.99 or quicker require a flywheel sheild SFI 6.1, 6.2, 6.3 or 9.1.

2.14 Automatic transmission: Quicker than 10.99 or faster than 135 MPH require tranmission shield meeting SFI spec 4.1

4.4 Frames: All cars running 9.99 or quicker must have a serialized chassis sticker affixed to the frame (NHRA issued).

4.8 Parachutes: Mandatory for cars 150 MPH or faster.

4.10 Roll bars: Mandatory in cars 11.49 or quicker. Mandatory for convertibles 13.49 or quicker.

4.11 Roll cage: Mandatory in cars 10.99 or quicker or faster than 135 MPH. Cars with unaltered firewall, floor and body running between 10.00 and 10.99 roll bar permitted in place of roll cage. I do not believe that this applies to a convertible: they require a rollcage.

6.3 Window net: A ribbon type SFI Spec 27.1 mesh type window net is mandatory on any car required to have a roll cage.

8.2 Delay Boxes/ Devices: Prohibited in all vehicles.

8.4 Master Cutoff: Mandatory if battery is relocated or if car is 135 MPH or faster or 9.99 or quicker.

9.1 Computer: Traction control prohibited.

10.3 Arm Restraints: Required for any car that must have a roll cage. Convertibles require arm restraints if 11.99 or quicker.

10.4 Credentials: Each driver must have a valid unrestricted state or government issued driver's licence or NHRA competition licence. Class 3B or 4B NHRA licence required if 9.99 or quicker. A new driver who has not previously held a competition licence will be given the blindfold test and will be required to make a minimum of 6 runs under the observation of two licenced drivers and a designated NHRA official.

10.5 Driver Restraint Systems: Quick release 5 point 3 inch harness SFI Spec 16.1 mandatory in cars that are required to have a roll bar or roll cage.

10.6 Head Protector: In any car with roll bar or roll cage a padded head protector must be provided at the rear of the driver's head. Also required if car 135 MPH or faster.

10.7 Helmets: Drivers must wear an SFI or SNELL approved helmet. 13.99 or quicker require Snell 90, 95 K98, 2000, SFI 31.1A, 31.2A, 41.1A or 41.2A specs.

10.8 Neck Collar/Helmet Restraint Device: Required with helmet.

10.10 Protective Clothing: Drivers are required to have as a minimum:
- 11.49 to 10.00: Jacket meeting SFI Spec 3.2A/1. All drivers are required to wear full length pants to the ankle, shoes and socks. Nylon clothes and open toe shoes prohibited.

10.11 Seat belts: All cars not required to use 5 point 3" wide SFI Spec 16.1 harnesses must be equipped with accepted quick release driver seat belt.


Sport Compact has an engine cpacity limit of 3.5 litres, so 996 TT and the like aren't class legal for sport compact. However I included the Sport RWD class info for your edification and amusement. Note the weight breaks and maximum turbo size compared to some of our big dogs.


Class regulations: Sport RWD

+ Minimum weights: For 6 cylinder with 1 power adder (eg turbo): 3500 pounds. With 2 power adders (includes CO2 or Nitrous intercooler spray): 3750 pounds
+ Engine containment device mandatory.
+ All exhaust must flow through functioning mufflers and must exit behind rear tires.
+ Six cylinder, twin turbo applications limited to maximum 52mm turbo, where the maximum compressor housing inducer diameter is 53.50mm, measured at the point where the leaading edge of the compressor wheel meets the housing.
+ Six cylinder single turbo applications limited to maximum 76mm turbo, where the maximum compressor housing exducer diameter is 77.50 mm.
+ Transmission - automatic: Must be from same manufacturer, no crossbredding (ie no GM/BMW).
+ Transmission - manual: Must be from same manufacturer.
+ Rear end: Swaps probhibited.
+ Interior: Complete interior, including dashboard, door panels, headliner, etc mandatory. Two matching front seats mandatory. All factory controls must be retained, ie lights, signals, horn, wipers, windows.
+ Body: lightweight body panels limited to hood, fenders and deck lid.
+ Street equipment: Windsheild wipers mandatory. Complete headlight and taillight assemblies mandatory, must be operative. Complete OEM windshield and windows mandatory, Windows must be operative as per factory specifications.

 

Very interesting Kenny. Why no screw (Whipple) superchargers?

 

Because the Roots superchargers can't compete and drag racers are knuckle draggers.

 

Thanks for posting, Kenny. I just realized how out of standards my car really is.

 

thats why we will never see a 911 run better than the 9.17, no with those rules

 

Not under Sport Compact. That pass was before Sport Compact rules as you know.

However under regular NHRA there will be a class where you can run a 996TT, so you will see a 911 run quicker than 9.17 in the fullness of time.

 

I am looking very much forward to that date.

 

Wow. That's unbelievable! I figured that new 5.0L Whipple would be sitting on top of a lot of 540 c.i. drag engines. I guess not.

 

This is one of my customer's cars:



Jeff

 

You guys could go to NDRA (Nopi) building a fast 911 is half of the battle going by the rules is a complete diferent storie BUT rules or no rules I will wait for the first Porsche to go better than 9.16, 996,930,914 I dont care let me see the new king

Turbo Street Class Sport Compact FWD/AWD/RWD cars allowed. Unibody chassis, all glass, ¾ interior, 4 and 6 cyl cars allowed, race gas only, motor swaps and 2 power adders allowed

TURBO STREET: Engine Diaper or Engine Pan mandatory on all forced induction cars 9.59 and quicker. SFI approved 38.1 head and neck restraint system required for all 9.59 and quicker cars.

•SPONSOR DECALS: All racers must have series and or class sponsor decals as required by NDRA. Competitors can utilize a competing sponsor product / logo.

• CLASS: The class designation (T/S) must be on the right side and the front window in 3-inch tall letters.

• NUMBERS: Car numbers must be on the right side window in 6-inch tall numbers, and the front windshield in 3 inch tall numbers.

• BODY: Stock import or domestic compact car or truck body must be retained. Lightweight parts limited to hood, fenders and ground effects only. Fenders can’t be modified in any way, outside of trimming 1" from wheel well, to allow for a larger tires. Due to most sunroofs not being safety glass, sunroof plugs allowed. Cutting or drilling of body or chassis is limited to front bumper support to allow for installation of turbo intercooler, and rear bumper support may be removed. Removal of other components for purpose of lightening vehicle prohibited. However the fender wells maybe trimmed for tire clearance a maximum of 1 inch. Chop tops not allowed. Lexan or Plexiglas windows are prohibited. No tape can be used to join/cover body seams. Body or paint damage incurred at that event can be fixed by any means for remainder of the event.

• INTERIOR: Door panels, dash, headliner and carpet must remain in place. Passenger seat and back seat plus all interior trim from driver's seat back can be removed. Doors must work from inside and outside of vehicle. Windows and door switches must work and be located as designed by manufacturer. Cars will be re-inspected on the return road any cars found missing required
components shall be disqualified. Stock steering column and turn signals most be retained.

• ENGINE: Reserved for 4 cylinder, 2 rotor, 6 cylinder entries equipped with a turbocharger, superchargers, a nitrous oxide system for a total of up to two power adders. Engine must be the some make as vehicle racing. Bolt on modifications only. Aftermarket cams, headwork, valves, cam gears and other internal modifications allowed. Motor-swaps allowed. Approved aftermarket blocks allowed. No air-cooled entries. Wet sump oil systems allowed for competition, no vacuum pumps of any kind allowed for the oiling system.

• TURBOCHARGERS: FWD K-Series/Ecotec powered cars: 70mm (70.77max) FWD 4 Cylinder cars: 72mm (72.78¬max) FWD 6 Cylinder cars: 70mm (70.77max) AWD 4 Cylinder cars: 70mm (70.77max) RWD Rotorty cars: 70mm (70.77max) RWD 4 Cylinder cars: 70mm (70.77max)
• MINIMUM WEIGHTS: FWD K-Series/Ecotec powered cars: 2500lbs. FWD 4 Cylinder cars: 2400lbs. FWD 6 Cylinder cars: 2500lbs. AWD 4 Cylinder cars: 2700lbs. RWD Rotory cars: 2700lbs RWD 4 Cylinder cars: 2900lbs.

• INTERCOOLERS: Air to Liquid intercoolers allowed. All intercooler components must remain under hood. No components for the intercooler allowed inside of the cars.

• CYLINDER HEADS: Must be commercially available, produced in runs of 500 or more. No billet cylinder heads. Any internal modification permitted.

• INDUCTION SYSTEMS: Any commercially available induction may be used, but stock configuration must be retained. Ex: Fuel injected entries must remain fuel injected, with the same type of injection used as delivered stock. Example: if the car is delivered from the factory in a single throttle body configuration it must remain as a single throttle body.

• NITROUS: Bottles must be stamped 1800-psi minimum. Bottles must be mounted directly to the body, utilizing all mounting points. Electrical bottle heaters allowed. NOTE: no external flame heating of bottle allowed. Blow down tube is required if bottle is inside passenger compartment.

• EXHAUST SYSTEM: NDRA does not require mufflers for racing however, check with track, as some tracks have a noise ordinance, which requires a muffler for Saturday racing. Catalytic converters may be removed.

• DRIVE TRAIN: FWD, or AWD, or RWD entries. Stock drive train configuration required. Stock style rear end must be used. * Rear ends: O.E. style bolt in differential casing allowed. No aftermarket substitutes allowed. Examples (8.8", 9", or 12 bolt). If vehicle comes stock with I.R.S., vehicle must stay that way for competition.

• TRANSMISSION: Factory available OEM manual gearbox / with an H-Pattern shifter or factory available OEM automatic transmission allowed. Modifications limited to what fits completely within stock transmission and bell housing. Aftermarket H-Pattern shifters allowed, but can’t be gated. Scatter-shield required if 11.99 or quicker. See section 4.15 for additional details. No aftermarket Transmissions of any kind allowed. Absolutely no trans-Brakes allowed.

• CLUTCH/FLYWHEEL AND FLYWHEEL SHIELD: After market clutch and flywheel shield required if car is running 11.99 or quicker. See section 4:13 and 4:16

• CHASSIS: Full stock chassis (Full stock floor pan) required. A roll bar is mandatory in all cars running 11.99 or quicker and in convertibles running 13.99 or quicker. Any vehicle equipped with a roll bar must be equipped with a padded head protector to be placed behind the driver's head mounted in such a way so as to help minimize the risk of whiplash. The cage or roll bar must also be fitted with padding in any area where it may come in contact with the driver's helmet. Padding with ¼ inch compression or padding meeting SFI Spec 45.1 padding or better shall be used. No other forms of padding will be accepted.

• SUSPENSION: Must use one shock per wheel, or retain original style suspension. Coil-over

shocks allowed. No wheelie bars allowed. Stock shock towers must remain completely intact front and rear. Roll bar may be attached to shock towers. Stock pieces may be strengthened. REAR: Entire rear sub frame structure must remain intact. The entire rear portion of the strut mount must also remain intact. Lower control arm alterations limited to lengthening or strengthening. Back half conversions not permitted.

• WHEELBASE: Stock wheelbase must be retained.

• IGNITION SYSTEM: Aftermarket crank triggers, two-step rev limiters, ignition amplifiers, spark computers or dynamically adjustable engine management systems and piggyback engine management systems are allowed. Stand-alone systems allowed.

• LIGHTS/STREET EQUIPMENT: Headlights, turn signals, horn, and taillights must be retained in stock condition. One headlight can be removed for air induction.

• BRAKES: All cars must have four working hydraulic brakes, and in good working order.

• COOLING SYSTEM: No electric water pumps. Electric fans allowed. Must use overflow/catch can 1-pint minimum. NOT be mounted in front of tires or with overflow line pointed at tires.

• TIRES/WHEELS: FWD cars allowed 26" and smaller slicks. FWD 6 cyl. cars 2500lbs and over allowed 28" slicks AWD cars with 1 power adder allowed slicks (Min weight 3,000lbs) AWD cars with 2 power adders allowed DOT approved street tire(Min weight 3,150lbs) AWD max tire size allowed is 235/60, or 26" RWD 4 Cylinder/ Rotory cars allowed only DOT approved street tire. (Min weight 2,900lbs) Cars running 11.99 or quicker must have metal valve stems. Tubes permitted. NOTE: "absolutely" no mini spare tires or non-speed rated tires may be used.

• FUEL: Gasoline only. No VP 56,or VP Import allowed in class. Fuel cells allowed, fuel cells must be covered or separated from the drivers compartment, but can not be in the engine compartment.

• DRIVERS LICENSE: State, or Federal, or International drivers license mandatory.

• COMPETITION LICENSE: A valid competition license mandatory for cars running 9.99 and quicker at a NHRA track and 9.49 and quicker at a IHRA track. (no exceptions!)

• DRIVERS SAFETY EQUIPMENT: Any vehicle equipped with a roll cage or roll bar must be equipped with a padded head protector to be placed behind the driver's head mounted in such a way so as to help minimize the risk of whiplash. The cage or roll bar must also be fitted with padding in any area where it may come in contact with the driver's helmet. Padding with ¼ inch compression or padding meeting SFI Spec 45.1 padding or better shall be used. No other forms of padding will be accepted.

• FIRE SUPPRESSION SYSTEMS: Mandatory on all Pro cars, and Sportsman cars 9.59 and quicker. System must be SFI 17.1 approved for competition use.

• HELMETS: Drivers of cars 13.99 or quicker must use a helmet that is Snell 95, 2000 SFI 31.1, 31.2, 41.1 or 41.2 spec. Any helmet that is modified in any way other than paint jobs shall be deemed unsafe and not suited for competition. Drivers must be wearing their helmet prior to entering the burnout area. The NDRA requires the use of Full Face Helmets and strongly recommends the use of the proper visor as well. A 38.1 head and neck restraint system required for all 9.59 and quicker cars.

• CLOTHING: 10.00-11.99: Drivers must wear jacket meeting SFI 3.2A/1.

• SEAT BELTS: All cars that require a roll bar must use a 5-point SFI 16.1 driver restraint system equipped with a quick release system. Belts must be mounted to the frame or cross member or in a reinforced mounting point so that all connections are in a direct line with the direction of the pull. Cars requiring a SFI 16.1 drivers restraint system must have the belts updated 2 years from the dates stamped on the SFI belt tags. Cars using OEM type seats may route the crotch strap in front of the seat rather than through a hole in the base cushion.

• PARACHUTES: Required for all cars exceeding 150 mph. Tech inspectors may inspect parachute for damage or wear at our discretion. Parachutes must be solidly mounted to frame and release housing must be no more than 12" from parachute pack and must be mounted in such a way to ensure smooth operation without failure. NOTE: any car running in excess of 150 MPH must pull the chute! If the driver doesn't pull the chute the run maybe DQ'd. If you're not sure pull the chute anyway!

 

Kenny,

Can you explain what 4.4 is or entails?

 

4.4 Frames: All cars running 9.99 or quicker must have a serialized chassis sticker affixed to the frame (NHRA issued).


Chassis certification, they want to make sure the roll cage is the correct size and is welded the proper way, the side bars are of xx distance and such

Hope that helps

 

It's talking about the rollcage certifications. Anything that is over 10pt (or goes over the drivers head and includes a Halo bar) has to be inspected by a local NHRA chassis inspector in order to be certified. To run a 8.5 (or slower) with a 10-12pt cage, a 7.5 (or slower) with a 25.5 Chassis (also has some weight factors, don't remember off the top of my head) and I want to say its 6.5 (and slower) for a 25.2 Chassis (also depends on weight).

 

An NHRA official must inspect the entire frame/chassis/cage (including from underneath) and certify that it meets NHRA specs.

This is all I'm waiting for on my Dodge before I get her teched to 8.50 and go for my license passes.

 

where you guys get your license ?