General Vehicle Components

Official Ultra4 requirements for vehicle access, firewalls, fluid protection, doors, floorboards and other general competition vehicle components.

Section 2.5 • Common Vehicle Requirements

2.5.1

The vehicle occupants must be able to quickly and easily enter and exit unassisted with the vehicle in any position.

2.5.2

Firewalls and/or bulkheads must separate the driving compartment from any fuels, engine fluids, and acids. Exception to this rule is cars that have a rear-mounted radiator, cars with rear-mounted radiator should have a wire mesh panel to protect radiator.

2.5.3

Oil coolers, transmission coolers and radiators located in front of the vehicle occupants must have a shroud that, in the event of a rupture or leak, will prevent liquids from blowing back or leaking onto the occupants. All hoses running through the passenger compartment must be shielded. Steel braided hoses do not constitute a shield.

2.5.4

All vehicles with operational doors must have positive locking mechanisms on the doors and doors must also have a permanently attached positive secondary latching device.

2.5.5

All vehicles must have an all-metal firewall separating the occupants’ compartment from the danger of fire from the engine and fuel supply. A minimum firewall must be liquid tight and extend from body side to body side. If engine is rear-mounted, firewall must be liquid tight and extend from the driver’s shoulder height to the vehicle floor and extend from body side to body side. If rear mounted fuel cell is higher than driver’s shoulder height, a firewall between the driver and the fuel cell must extend at least 2” (50mm) above the top of the fuel cell. The hood is considered an extension of the firewall on front engine vehicles. Any hole placed in the firewall for structural members, lines, etc. must be kept to a minimum. The hole should not have more than 0.0625” (1.6mm) gap around the items passing through the firewall. Metallic tape must be used to seal the hole between the firewall and the item passing through the firewall. Rear mounted engines are not required to have a top mounted hood.

2.5.6

Floorboards are required on all vehicles and must be attached by a minimum of six 0.25” (6mm) bolts per side if not an integral part of the body or chassis. Dzus or other quick- turn or ¼-turn fasteners are not permitted. Floorboards must cover the entire area from in front of the pedal assembly to behind the seat(s), and from the outside edge to the outside edge of the vehicle. Installation must be done in such a manner as to afford maximum protection to the occupants from debris.

2.5.7

Exhaust systems shall be installed in such a manner as to direct exhaust away from the occupants, fuel tanks, and tires. Exhaust systems shall be securely mounted.

2.5.8

Vehicles with front mounted engines must have a hood that completely covers the engine compartment. Rear mounted engines are not required to have a hood.

2.5.9

All vehicles shall have a competition appearance, be neat in appearance, and be well maintained.

2.5.10

Vehicles shall not have any sharp edges or protrusions that could endanger occupants, officials, competitors or spectators.

2.5.11

Ballast is permitted, provided it is securely fastened to the vehicle with a minimum of two 0.50” (13mm) diameter Grade 8 (10.9) bolts.

← Vehicle Identification | Roll Cages →