2019 PDRA PRO NITROUS Class Rules

DESIGNATION: Pro Nitrous or PN followed by car number. Numbers must be at least 4” tall and on both side windows, upper left of rear window and upper right of windshield.

FIELD: 16 car qualified field.

Class Sponsor Decals Required on both sides of the vehicle, front fender or hood scoop.
PDRA Logo required on both sides of the vehicle.

All rules subject to change at the sole discretion of the PDRA Technical Services Department.

Alternates receive ONLY 25 entry points.


BODY: Funny car or one piece bodies not allowed even if equipped with doors. Maximum front end overhang of 45” as measured from centerline of front spindles. An PDRA accepted extension may be used to reach 45” if the front end overhang of the body is less than 45”. All bodies must originate from a production vehicle. All new cars must be accepted by the PDRA competition department prior to construction. All vehicles must be professionally finished, painted, lettered, numbered and decaled.

DOORS: Required. Doors must be functional and able to be opened from both the inside and outside of the vehicle. Doors may be fabricated from carbon fiber, fiberglass or metal. A metal deflector between the fenders and the leading edge of the doors is required.

FIREWALL: Magnesium, aluminum or composite not allowed. All firewalls must be made of steel or titanium .024” minimum thickness.

FRAME: Chassis must meet SFI Spec 25.1. Chassis must be recertified yearly by the PDRA and have specialized sticker affixed to roll cage before participation. See General Regulations 4:4, 4:11, 10:6. A panel of .032-inch aluminum, .024-inch steel, or carbon fiber must be installed on the inside portion of the roll cage anywhere the driver's legs can come into contact with the cage. Panels must be installed in the front and lower portion of the drivers-side X brace. Panels must attach to the interior side of the tubing, or no further than the middle of the tubing, with "impact-type" padding attached to the panels. Padding must extend to be flush with X brace. Minimum padding thickness is 1/4 inch. An additional panel(s) of .032-inch aluminum, .024-inch steel or carbon fiber must be installed in the roll cage roof area. The panel(s) must, at minimum, extend from the drivers side roof bar to the centerline of the vehicle. The panel(s) in the Funny Car cage area must be removable for proper chassis certification inspection. Racecars built before 2015 has a 12 month grace period. All racecars must meet requirements listed above by 2016.

FLOORS: Replacing stock floors with .024” steel or .032” aluminum allowed. Driver’s side floor pan must be .024” steel and must be welded in place extending from firewall to back of driver’s seat. Carbon fiber or aluminum may be utilized in the passengers portion of the flooring in the driver’s compartment.

HOOD SCOOP: Allowed. One opening only. Must be finished and painted to follow the bodies paint scheme
TAIL LIGHT: Functional rear tail light is required. Tail light must be permanently mounted and controlled from the driver’s compartment.

WINDOWS AND WINDSHIELD: Required. May be replaced 1/8” inch think lexan, plexiglass or other shatterproof material. An opening with a 4” diameter minimum is required on side windows adjacent to the driver.


BATTERY: Maximum of two batteries allowed. All batteries must be securely fastened. An external master electrical shut off clearly labeled “PUSH OFF” is required.

BRAKES: Four wheel brakes with dual master cylinder mounted above frame rails required.

CHASSIS: SFI 25.1 E or 25.2 certification required.

DRIVER LOCATION: Must be in stock location, on left side of vehicle.

GROUND CLEARANCE: Minimum of 3” required from whatever portion of the vehicles body or chassis that breaks staging beam to 12” behind front axle centerline.

STEERING: SFI 42.1 steering wheel disconnect required.

SUSPENSION: Race car type suspension required. Solid suspension prohibited. Shock absorbers required for all four wheels.

TIRES: Automotive type tires designed specifically for racing required. Tires cannot be located outside of bodyline. Manufacturer, model and size information must be clearly designated.
No Radial Tires allowed.

WHEEL BASE: Minimum 100″, Maximum 115”. S-10, Ranger, Dakota Maximum 125”. Maximum variation is 2” side to side.

WHEELIE BARS: Required. Non-metallic wheels required.

WHEELS: Wheels meeting SFI spec 15.1 mandatory. Maximum width 16”. Use of a liner mandatory on all non bead lock wheels.


960 cubic inch maximum limit  (Tolerance: No more than 2 cubic inches) Minimum weight at conclusion of run, including driver 2,400 lbs.
900-910 cubic inch combinations at conclusion of run, including driver 2,375 lbs.
CYLINDER BORE SPACING: Bore Spacing is set at a maximum of 5.300”

Any engine less than 900 cu. in. can weigh 2,325 lbs.

CLUTCH AND FLYWHEEL: Clutch and flywheel meeting SFI 1.3, 1.4, or 1.5 certification required. SFI 29.1 flex plate required on all torque converter equipped cars
(SFI 29.2 recommended)

DRIVELINE: A full 360 degree driveshaft tube is required over yoke, extended a minimum of 12” required from transmission tail shaft. Minimum thickness of tube housing is .050” chromemoly or titanium. Two piece units accepted with a minimum of 6 3/8” grade 8 bolts. SFI 43.1 driveshaft required.

ENGINE CONTAINMENT SYSTEM: SFI 7.1 lower engine containment system required. If a flexible 7.1 system is utilized, it must be accompanied by a carbon fiber or aluminum belly pan with a minimum 2” vertical lip.

ENGINE SETBACK: Maximum of 10% of total vehicle wheel base as measured from the centerline of the forward front spindle to center of front spark plug hole.

EXHAUST: Automotive type system designed specifically for racing required. Exhaust gasses must be directed out of the body towards the rear of vehicle and away from the driver and fuel system.

All removable multi-piece exhaust collectors/stacks must be securely fastened with either an NHRA-accepted header tether, a minimum ½” (half-inch) stitch weld located on each primary tube or be permanently attached to the vehicle body or frame with positive fasteners (i.e. exhaust hangers, support brackets, bolts/nuts, etc.) such that they require tools for removal.

HARMONIC BALANCER: SFI 18.1 certification required.

FLYWHEEL SHIELD: SFI 6.3 certification required.

FUEL: Alcohol, gasoline and methanol allowed. The use of nitromethane is strictly prohibited.

INTAKE MANIFOLD: An PDRA accepted burst panel is required on all vehicles.


REAR END: Automotive type, Full-floater rear end required. Titanium Wheel studs prohibited.

Mark Williams EV4 axle system, or Strange STRL-5500SBB accepted.

STARTER: Required. All entries must be self starting. No push starts allowed.

SUPERCHARGER: The use of any type of supercharger is strictly prohibited.

TURBOCHARGER: The use of any type of turbocharger is strictly prohibited.

TRANSMISSION: Any type allowed.


CREDENTIALS: A valid competition license is required. A valid NHRA or IHRA competition license will be accepted and may be transferred when presented with a current physical. When an event is contest at an NHRA Member track only PDRA or NHRA competition licenses will be accepted.

COMPUTER: Allowed.



TOW VEHICLES: Allowed. A valid driver’s license is required to operate any type of tow vehicle. All passengers must be seated inside of vehicle with all doors closed. Riding in open hatchback, trunk or cargo area not allowed. ATV’s are allowed with a maximum of one passenger who must be seated at all times. Golf carts are allowed with a maximum of four passengers who must be seated at all times. Posted pit speeds must be obeyed at all times. If pit speed is not posted, maximum pit speed will be 5 mph.


DRIVER RESTRAINT SYSTEM: SFI 16.1 certification required (7 point system recommended).

FIRE SYSTEM: SFI 17.1 system required. System must contain a minimum of 20 lbs of fluid or gas fire suppression agent. One nozzle required inside driver’s compartment must be directed at driver’s feet. Two or more nozzles must be directed at front of engine and fuel cell. All fire suppression must be released with a single actuation (i.e. single handle, button or lever).

HEAD AND NECK RESTRAINT: SFI 38.1 required. An aluminum skid plate located above driver’s head is recommended.

HELMET: SN-2010 or newer, SFI 31.2 or 41.2 required. Use of open face helmet prohibited. Eject Helmet Removal System (Part # SDR 890-01-30) or equivalent required.

MASTER ELECTRICAL CUTOFF: Required. Must be clearly labeled “PUSH OFF”.

PARACHUTES: Dual parachutes required. Separate shroud-line mounting points with 1/2” sleeved grade 8 bolts required.

PROTECTIVE CLOTHING: A driver’s suit meeting SFI 3.2A/15, gloves meeting SFI 3.3/15, shoes meeting SFI 3.3/15 and a head sock meeting SFI 3.3 required. A head sock is not required when a helmet manufactured with a skirt meeting SFI 3.3 is used. 3.2A/20 fire suit recommended.

RF SHUTDOWN RECEIVER: Properly functioning Electrimotion shutoff device (part numbers SB001 and RF001) recommended.

ROLL BAR PADDING: SFI 45.1 required.

TRANSMISSION: All transmissions must be covered by a one piece SFI 4.1 restraint.

UPHOLSTERY: Driver’s seat foamed with energy absorbing material, formed for the driver and covered with flame retardant material is required. Lateral helmet supports required.

WINDOW NET: SFI 27.1 required.