IHRA Official Rulebook
IHRA reserves the right to require a competitor to make one moderate (shake down) pass, down the quarter mile, on an untested (new) vehicle, prior to making an official qualifying attempt. Current physical records are required for all professional, TS and TD drivers. Forms must be filed with IHRA Technical Department prior to competition. A licensed driver may compete in an entry under his license limitations, but not over (this order of classification is listed below). He may also not cross over from the dragster category to the bodied cars, nor vice versa, unless specifically licensed for each. A dragster, altered or roadster is considered an “open bodied car”, not a “full bodied” car. Competitor must purchase a competition number for each class they wish to compete in, CLASS A: TF, NFC, PM, PS, FA, NH CLASS B: Top Sportsman, Top Dragster (ET 0-7.99 1/4) CLASS C: Quick Rod, Super Stock (ET 8.00 -8.99 1/4) CLASS D: Super Rod, Super Stock (ET 9.00-9.99 1/4) CLASS E: Stock, Hot Rod (ET 10.00 and slower) CLASS M: Motorcycles and Snowmobiles CLASS JR: Junior Dragsters & TCR (see Junior Dragster or TCR for details) CLASS EXHIBITION: Jets, Wheelstanders, etc. LIQUID OVERFLOW: All cars in competition must be equipped with a system that will prevent excess fluids from spilling onto the racing surface. Minimum “catch-can” capacity: 1 pint. See class specifications. MASTER CUTOFF: Mandatory if battery is relocated or is specified by class requirements. It must be located on the rear of all entries and must break the positive side battery supply to the competition vehicle. If the switch is mounted to faciltiate a push or pull activation it must be positioned in a way where off is in the push position. If the switch is mounted in any other fashion, it must be labeled in a way that is clearly identifiable as to which way off is positioned. Plastic or keyed switches are prohibited. NEUTRAL SAFETY SWITCH: Mandatory on all entries with automatic transmissions to prevent the vehicle from being started while in gear. NITROUS OXIDE INJECTION SYSTEM: Only systems meeting IHRA approval may be run. All bottle relief valves must have bulkhead fitting on tank. All bottles must be securely mounted, stamped with minimum Dot -1800 pound rating. Nitrous Oxide bottle(s) located in driver compartment must be equipped with a relief valve and vented outside of the drivers compartment. Nitrous Oxide bottles located in the trunk or rear of the entry must be equipped with a relief valve and vented outside of the drivers compartment or be completely isolated from the drivers compartment by a firewall that is properly sealed to prevent gas from entering the drivers compartment. System must be commercially available and installed per manufacturers recommendations. Nitrous Oxide is prohibited from being in any other pressurized container on any entry other than a manufacturer’s nitrous bottle. All Nitrous bottles must be recertified every 5 years and stamped to indicate the last inspection date. All systems must be activated by a wide open throttle switch and utilize all manufacturers safety products. The use of any commercially available thermostaticlly controlled bottle warmer is accepted. The use of any other method of externally heating nitrous bottles is prohibited. See class requirements. OIL SYSTEM: All tanks, accessories and related lines must be affixed in a way to prevent accidental leakage during competition. Oxygen bearing or power enhancing additives prohibited in any form. PARACHUTE: Required on all machines that exceed run of 150 mph on 1/4 mile or 125 mph on 1/8 mile. Cars running 200 mph in the 1/4 mile must have two parachutes with one release handle. Drag chutes must have their own independent mounting bracket (a grade 8 sleeved bolt must be used) and must not be the same bracket as the shoulder harness. PRESSURIZED BOTTLES: All pressurized bottles must meet and be engraved with appropriate DOT rating 1,800 Ibs. minimum. PROTECTIVE CLOTHING: See Class Requirements for type of protective clothing required for class such as SFI jacket, pants, gloves, boots, shoes, head sock or arm restraints. All above must be SFI tagged. In all classes that mandate the use of a neck collar a Head and Neck Restraint System may be used with or without the neck collar. Drivers in all open bodied front engine cars with open face helmet must wear a breather style face mask and protective goggles. Drivers in all open bodied cars must wear SFI spec 3.3 gloves and arm restraints. Any class where SFI pants are not required, short pants, tank tops, nylon or flannel pants are prohibited. All clothing worn by competitors in all classes must be free of holes and excessive wear. This includes all protective clothing as welll as pants and shoes where SFI specified equipment is not mandatory.
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