UPDATED D1 Rules and Regulations

Event sanctioned by D1 Grand Prix USA Safety Modifications and Guidelines:
Updated May 4th 2004

• Anything that compromises the safety of the vehicle in a collision may not be removed with the exception of air bags and or factory collision reinforcement bars. Exept for anti lock brakes, traction control, and active stability managment systems.
• Each car must be equipped with a six-point or better roll cage.
• Functional tow hooks must be installed on both front and rear of vehicle
• Roll cage must be welded or securely bolted and anchored. If roll cage is bolted then its must be securely reinforced with an anchor plate and backing plate sandwich on each side of the floor pan.
• Roll cage may be placed in front or through the dashboard.
• Roll cage tubing must be at a minimum of 1.75 inches OD tubing and no thinner than 0.118 wall mild steel or 1 .75x .083 Chrom moly tubing.
• Drivers seat must be equipped with three mounting point or better racing type safety harness of nylon web, at least 3 inches in diameter, with a metal buckle. Shoulder harness must be an H type not Y type harness. Safety Harness must be securely bolted to the frame.
• Drivers must be fitted with Snell Foundation (SA) approved safety helmets with 1995 Snell Foundation (95SA) or later safety sticker of approval displayed inside; head and neck restraints systems are optional and must also be Snell Foundation (SA) approved. Face shields are strongly recommended.
• Drivers must wear driving suits made of approved fire resistance material (Nomex, Kynol, etc.) in single or double layers. Socks and full length underwear must also be fire resistance. (Does not apply to driver search events but highly recommended for the safety of all D1 participants)
• Drivers must wear fire resistance gloves with no holes composed of Nomex or leather. Shoes must be of fire resistant materials or leather on top. Racing shoes are strongly recommended.
• Catch tanks must be securely fastened. Radiator catch tanks must have a minimum capacity of 1 qt. each. Oil catch tanks may also be installed on engine oil breathers where practical. NO FLUID LEAKS OF ANY KIND WILL BE TOLERATED.
• It is highly recommended that all cars be equipped with at least a 2 lb. 10 BC fire extinguisher securely mounted in the cockpit. An onboard halon type fire system is strongly recommended.
• Master electrical cut-off switches are highly recommended and should clearly be marked if fitted outside the vehicle.
• Fuel cells are strongly recommended. (Not required)
• Fuel filler caps must be securely fastened so as not to open on impact.
• All hoods and deck lids must be adequately and securely fastened.
• All drain plugs must be securely fastened.
• Batteries must be securely fastened down, positive terminals well insulated and if located in the cockpit must be covered or have leak proof caps.
• All cars must have working rear brake light.
• Brake systems including brakes, lines, fluid and pedals must be in good shape and working condition. Dual master cylinders are recommended.
Authorized Modifications:
• Each car must maintain the OEM unibody.
• Must maintain tempered front windshield.
• Every car must maintain a complete exhaust system with a factory or aftermarket catalytic converter. High flow catalytic converters are acceptable.
• ALL Tires must be DOT approved with a minimum tread wear rating of 160. No DOT-R Allowed
• Aftermarket body panels, bumper covers and wings are permitted
• Seam welding the unibody is permitted.
• Suspension upgrades are open.
• Factory wheels may be replaced with aftermarket wheels.
• Any grade of automotive gasoline may be used for fuel.
• Engines are open for modification.
• Other than what is listed above cars are open for modification.