Unlimited 4 wheel, single and two seat vehicles. Limited to IRS. No straight axle suspension.

Last Updated May 15, 2024

DEFINITION

Unlimited 4 wheel, single and two seat vehicles. Limited to IRS (Independent rear Suspension) No straight axle suspension.

No production bodied vehicles allowed in this class. Engines must be sealed and supplied by a Unlimited Off-Road Racing approved engine supplier.

GENERAL REGULATIONS

Entrants in this class shall comply with all applicable general regulations.

TECHNICAL REGULATIONS

This class is an open class, and all components will be considered open unless restricted herein.

NOTE: The TR abbreviations listed under this class (I.E. TR1 HELMETS) refer to TR cross reference listings in the front of this book. These TR cross-referenced listings are part of the class rules. Where a conflict occurs between the TR cross-referenced listing and a rule contained under this class, the rule contained under this class takes priority.

SAFETY EQUIPMENT

TR1 HELMETS

TR2 PROTECTIVE CLOTHING

TR3 EYE PROTECTION and DENTURES

TR4 HEAD AND NECK RESTRAINTS

TR5 FIRST AID KIT

TR6 EMERGENCY SIGNALING DEVICES

TR7 HORNS

TR8 REFLECTORS

TR9 FIRE SUPPRESSION EQUIPMENT

TR10 SURVIVAL SUPPLIES

SUSPENSION COMPONENTS

TR11 SHOCK ABSORBERS and BUMP STOPS

TR12 SECONDARY SUSPENSION

TR13 WHEELS and TIRES

Maximum tire size is thirty-seven (37) inches.

TR14 FASTENERS

STEERING and BRAKE COMPONENTS

TR15 STEERING

TR16 BRAKES

ELECTRICAL SYSTEM

TR17 IGNITION

TR18 BATTERIES

TR19 LIGHTS

TR20 STARTERS

FUEL SYSTEM

TR21 FUEL

TR22 FUEL TANKS

TR23 FUEL FILLERS LINES, VENTS, and CAPS

Fuel cell mandatory.

ENGINE, TRANSMISSION and DRIVELINES

TR24 ENGINE and ENGINE DISPLACEMENT

Engine is limited to a sealed create engine only. All engine components must remain as delivered by the manufacturer.

Only the following engines are permitted:

GM LS3 (525 HP) - Part number 19370413. Open ECU.

GM LS3 430 HP 19370416. Open ECU.

Ford 3.5 Ecoboost engine. Open ECU.

Ford 2.0L EcoBoost (turbo charged) 4-cylinder engine, part number M6007-20T. Open ECU.

Ford 2.3L EcoBoost (turbo charged) 4-cylinder engine. Open ECU.

Engines must be obtained and sealed by a Unlimited Off-Road Racing approved engine supplier. (See Unlimited Off-Road Racing approved engine builder list)

All engines restricted to wet sump oil pans. Oil pans may be modified for fit. No dry sump oil systems allowed.

All engines may use aftermarket fuel rails.

Any water pump, alternator, power steering pump may be used. (No electric water pumps)

LS3 engines may have a replacement high volume wet sump oil pump, timing chain guide may be replaced with upgraded GM chain guide and aftermarket harmonic balancer.

Oil accumulators are allowed.

Any manufacture wiring loam may be used.

TR25 ENGINE REPLACEMENT

GM LS3 engines may only be rebuilt by:

Wiks Racing Engines

Adam Wik

3265 Birtcher Dr Las Vegas NV 89118

(702) 837-2522 wiksracing@aol.com

Roush

Ron Sharp

12445 Lean Bldg. 6 Livonia, MI 48150

(734) 779-7343 ronald.sharp@roush.com

No other engine rebuilds allowed.

TR26 TRANSMISSION

TR27 THROTTLES

TR28 EXHAUST

TR29 DRIVE SHAFTS

TR30 FLYWHEEL SHIELDS

TR31 FLUID COOLERS

TR32 AUXILIARY EQUIPMENT

TR33 SUPERCHARGERS and TURBOCHARGERS

VEHICLE SAFETY EQUIPMENT

TR34 ROLL CAGES

TR35 SAFETY HARNESS

TR36 SAFETY NETS

TR37 SEATING

GENERAL VEHICLE COMPONENTS

TR38 DRIVERS COMPARTMENT

TR39 DOORS AND LATCHES

TR40 FIREWALLS

TR41 BALLAST

TR42 WEIGHT

TR43 FLOORBOARDS

TR44 BUMPERS and HAZARDOUS PROTRUSIONS

TR45 MIRRORS

TR46 SKID PLATES

TR47 STORAGE

TR48 CHASSIS and BODY

TR49 HOSES

TR50 IDENTIFICATION MARKINGS

Unlimited Off-Road Racing will assign race numbers.

TR51 ADVERTISING on VEHICLES

TR52 RADIO EQUIPMENT

TR53 WORKMANSHIP

TR54 TRACKING DEVICE