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

All vehicles must start event with a functional: generator or alternator, fan, water pump (water-cooled vehicles), and a complete functional electrical system. Air cooled vehicles are permitted.

2.5.8

Safe front and rear bumpers are required on all vehicles. No hazardous front or rear bumpers, nerf bars, frame heads or other protruding objects from vehicles are permitted. Ends must be capped and rounded to prevent any sharp edges. Bumpers and nerf bars must be designed in a way that reasonably minimizes the chance of two vehicles becoming locked together.

2.5.9

Bumpers must be constructed in a manner that would prevent tire to tire contact in a front or rear impact with another vehicle.

2.5.10

A rear-view mirror is required on all vehicles. Mirrors must have at least six square inches of mirror surface. Mirror must have a reasonably unobstructed view of area behind vehicle.

2.5.11

Skid plates designed to afford a reasonable degree of protection to the front suspension, steering, and brake components are recommended on all vehicles. Skid plates must be securely attached.

2.5.12

All spare parts and extra equipment carried on or in a vehicle must be securely attached or stowed to prevent movement during competition. All spare parts and extra equipment must be carried in a manner that minimizes the risk of injury to the vehicle occupants.

2.5.13

All vehicle body parts must remain on the vehicle (accidental damage excluded) during the entire event.

2.5.14

For all events, unless specified in advance by the race director, all vehicles must have a functioning winch affixed to the vehicle. A winch is defined as a rotating spool, driven by a motor, electric, hydraulic, or PTO that can tighten or loosen a cable. The cable must be made of synthetic material with a rating that is equal to or greater than the winch, no metal cables are allowed. Winch rating by class are as follows:

1) 4400, 4500, 4600, 4800 require an 8000lb or above rated winch.

2) 4900 requires a 5000lb or above winch.

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