2013 NRA SPRINT INVADERS CHASSIS
WINGS: Hydraulic front to back sliders are allowed. Maximum top wing size of 25 square feet with 30-inch side panels. Maximum center foil width of 60 inches. The deepest point allowed in the top surface of the wing will be 2-1/2 inches measured from top front of wing to the front edge of one-inch turn-up at the rear edge. Top surface of the wing measuring crosswise must be flat. No car will be allowed to compete without a top wing. Two stationary foils or rudders will be allowed to run the entire length of the underneath portion of the top wing. Maximum height proportions are one inch at the front and three inches at the rear. Nowhere shall the foil exceed three inches in height. One-inch turn-up on 90-degree angle allowed at rear of center foil (maximum) on flat wings only. Center foil must be one piece and fully sheathed in aluminum. Vent holes are prohibited. No split wings or bi-wings. Top wings cannot extend beyond the outside of the rear tires. Maximum front wing size to be six square feet total with a maximum width of 36 inches and 12-inch side panels. A maximum one-inch turnout will be allowed on the center foil of the nose wing with a maximum ˝ inch turnout on the bottom and top of the side panels. No wicker bills or gurney lips permitted on center foil, unless center foil is totally flat then a one inch wicker bill is allowed.
CARS: All cars must resemble a sprint car, hood, fuel tank, etc. Must be of standard upright design. Roll cage must be of a four-post design. No dirt champ cars. No oval shaped tubing allowed on or as part of the main structure. No aluminum frames allowed. The driver’s right side opening must be a minimum 10 inches vertical opening at any point and a minimum 21 inches horizontal opening at any point. Body panels or sheet metal may not extend rearward of a perpendicular vertical line drawn 10 inches from the back edge of the rear axle. No gurney lips or turnouts are allowed on any body panels. Bottom frame rails behind driver’s seat cannot be enclosed. Hoods may be a multiple piece design, but must appear to be one continuous piece. No side foils, rudders or panels are to extend beyond the roll cage on any side. No body pieces are to extend beyond or underneath the race car. No pieces may be added to the basic frame as to resemble, imitate or be specifically designed to deflect, trap or form a wind break by nature, except those used to cool or protect the motor and braking system. No part of the car can extend beyond front bumper, with bumper no more than 23.5 inches from front axle. Bumpers and nerf bars are mandatory and must be securely mounted. No aluminum frames, rear bumpers or nerf bars. Nerf bars must not be outside of tires. Front bumper only may be aluminum. Wheelbase: Minimum 83 inches, maximum 90 inches. Front axles must be steel only. 52 inches maximum width. No sway bars front or rear. No independent suspensions front or rear. Only one shock per wheel. No cockpit adjustable devices allowed. Exception: Hydraulic wing sliders. Brake rotors must be steel, aluminum or titanium. No hollow, tubular or drilled out bolts allowed. An NRA Sprint Invaders official must approve all carbon fiber on vehicle. No offset motors will be allowed; engine must be directly in front of driver. Driver must straddle driveline. All drivelines must be broken in the coupler or rear end slider, fully enclosed and contain no more than one U-joint or C-V joint. No torque arm drivelines allowed. Driveline hoop or strap is mandatory. No mirrors, two-way radios or communication equipment allowed. No on board computers, or any computer adjustable devices allowed. Protective rock screen must be installed in front of driver, with no larger than 4” square opening. Inside of rollcage must have protective padding where driver’s head can make contact with rollcage. Fuel cell securely mounted with bladder mandatory. No fuel additives. Fuel shut-off valve strongly recommended. Car numbers must be run on both sides of the fuel cell and both sides of top wing. A number on top of the top wing is recommended.
DRIVER: Flame retardant driver’s suit, gloves, and arm restraints required during competition. Helmets are mandatory and must be approved for racing. Must be full-face style. Helmet and driver’s suit must be worn anytime the car is fired off. The use of three (3) helmet restraint straps is strongly recommended! Neck collars, head rest padding, right head net or support - head net equipped with a quick release capability, knee pads or padded steering, drag link safety strap, fuel/fume detector and a five-pound fire extinguisher located in your pit area are all strongly recommended. Competition lap belts, shoulder harness, anti-sub strap, arm restraints, quick release steering wheel are all mandatory.
TIRES / WHEELS: Right rear Hoosier SC-1 stamped NRA will be mandatory at all NRA events. Procedures for co-sanctioned events will be on a per event basis. Maximum right rear wheel width is 18-inches, maximum left rear wheel width is 15 inches. No tire preps or tire softeners allowed.
ENGINE: 360 cubic inches. Plus 1% maximum displacement 360 + 1% = 363. No aluminum blocks, no titanium in engines, excluding valves, valve keepers, and valve retainers. No V-6 engines or big blocks. No down nozzle injectors. No throttle body or plenum type injectors. 2 3/16-inch maximum inside diameter of injector stack-2.187 at least 3 inches in length. Larger injectors may be used, but sleeves a minimum of 3 inches in length must be installed in stacks above the butterflies. Ford/Mopar engines may use maximum 2.1-inch injectors. No relief hole may be drilled above the butterflies on any injector. No alternation of injector manifold mounting holes will be allowed. You must be able to bolt stock intake to heads. No miscellaneous air holes in airbox or injector stacks.
Spec heads –Brodix heads part #27-211 (Chevy), #27-223 (Ford), and #27-222 (Mopar) (with ASCS stamp) may not be altered in anyway. Intake opening no larger than original opening. Intake port at no time may exceed 215 cubic centimeters.
Non-spec heads will be allowed but must have an unaltered ASCS or NRA intake-restricting gasket (#8E89208) properly installed. The gasket must protrude a minimum of .150 inches into the roofline of both the injector port and the cylinder head port. Absolutely no modification to bolt holes or port sizing. These gaskets are to be installed right side up with logo on top.
No Brodix #12 heads, no 18-degree heads, no canted valve heads, no heads other than the original 23 degree valve angle heads excluding Ford/Mopar. All aluminum heads will remain within 1 degree of the original 23-degree valve angle.
It is recommended that two head bolts be drilled 1/8” between #1 and #3 cylinder, two left front intake bolts be drilled 1/8”, in order for officials to tag and seal engine.
Penalty for altered spec head or altering gasket will be subject to suspension for one calendar year. Forfeit all points and money won during the race, which the infraction was found, and subject to a $500 fine that must be paid to NRA Sprint Invaders before reinstatement.
The NRA reserves the right to impound any questionable/suspicious engine or chassis part for up to seven days that must be verified as legal. Any driver refusing to comply will be disqualified and subject to further penalties.
No traction control devices of any kind allowed. This includes mechanical and electronic. No wheel speed sensors permitted. Violation of this rule will result in a year’s suspension.
In the event a car is found to be illegal by the inspector, the driver and car shall have all points and money forfeited that were won during the particular race program in question and may be suspended.
The preceding specifications have been prepared by the NRA Sprint Invaders as guidelines. No express, or implied warranty of safety shall result from publications of, or compliance with, these rules. They are intended as a guide, and are in no way a guarantee against injury, or death to participants, spectators or others. Anything not covered by these guidelines must be approved by the National Racing
The absence of a specific rule does not imply approval, consent, or permission regarding the subject.