Pirelli World Challenge Car Facts
Classes
Grand Touring (GT):
The allowed body styles within this class are coupe, sedan and convertible. The cars permitted in GT are typically sold in the market as “sports” cars, “sport touring” cars, or performance versions of “luxury” cars. Forced induction is permitted on cars that come equipped with forced induction stock, or on cars that SCCA Pro Racing has determined need help reaching the target horsepower range. Power output ranges from 425 – 525 hp. Weight varies depending on power output and tire size. All of the vehicles in GT are rear-wheel drive or all-wheel drive.
Grand Touring Sport (GTS):
Cars eligible in GTS are prepared to a level much closer to that of a stock vehicle. Additionally, many FIA GT4 class cars are eligible.
Touring Car (TC):
The allowed body styles in this class are 2 seat roadsters, coupes, hatchbacks, wagons, sedans. Power output ranges from 230 to 260 hp. Weight varies depending on the power output of the individual drivetrain configurations. Front-wheel, rear-wheel, and all-wheel drive configurations are permitted. Forced induction may be allowed on cars that have forced induction systems available from the manufacturer which do not void the factory warranties.
Touring Car B-Spec (TCB):
These are smaller cars with small, efficient, naturally aspirated motors. Modifications are limited to manufacturer specified performance spring and shocks to keep overall cost down. The only modifications allowed are pre-approved suspension kits, other than that no mods of any sort.
Bodywork Modifications
Stock body panels may be lightened. Body panels must maintain stock profile, unless alternate panel is approved. Non-essential trim may be removed.
GT: Hood, trunk/decklid and doors may be aftermarket composite components.Vented hoods are approved on a car-by-car basis. Additional aftermarketcomposite components may be approved if deemed necessary to make acompetitive package. Front splitter may protrude 2” from approvedfront fascia, but may be no wider than the tires at their widestpoint. Splitter may deviate vertically on the sides and bottom. Eachcar is permitted to run an approved rear wing.
GTS: Body panels are generally stock. Aftermarket wings and splittersare permitted.
TC: Body panels are generally stock. Only OEM wings as delivered onthe production car are permitted.
Chassis Modifications
Interior may be removed except dashboard. Miscellaneous unusedmounting brackets may be removed. Chassis seams may be welded. Doorsmust be capable of being opened from inside and outside. Driver’s seatmay be moved rearward as long as the seat back at the driver’sshoulders does not pass the vertical plane of the rear seat shelf.Windshield wipers may be removed, but an operational motor must remainin place.
GT: Windows may be replaced with Lexan.
Safety Modifications
A full rollcage must be used. The rollcages typically have eight mainattachment points within the cockpit/trunk. The A-pillar, B-pillar,and roof may be stitch welded to the rollcage.Fuel cells are required, unless stock fuel tank is located betweenframe rails and the axles.
The driver’s safety equipment includes a racing seat, six orseven-point harness, fullface helmet, head/neck restraint, window net,right-side head restraint net, side impact protection, driver legsupport system, multi-layer suit, fire resistant shoes, gloves andunderwear and a three-zone fire system.
Engine Modifications
Engines may be blueprinted and balanced. Full-prep engines may replacereciprocating internals. Custom intake manifolds may be allowed ifdeemed necessary. Engine management systems are free. Ignition system component may be replaced. Must maintain an operational on-board starter.
GT: Dry sump systems are permitted. Forced induction is permitted andmay be added to a car if deemed necessary to be a competitive package.Noise limit is 120 dBA. Traction control, and other commonly availableelectronic driver aids, are permitted.
GTS: Noise limit is 110 dBa. New for 2013: Any ECU/PCM may be used without penalty. Dry sump systems are permitted. Any cold air induction kit may be used without penalty..
TC: Noise limit is 110 dBA. Only electronic driver aids installed from the factory are permitted.
Drivetrain Modifications
Transmission and differential coolers may be added. Limited-slipdifferentials are permitted.
GT: Clutch and flywheel design are free, but starter ring geardiameter must be stock. Driveshafts and halfshafts may be modified or replaced, but must besame material and type as OEM. Two sets of gear ratios are permitted.Sequential transmissions are permitted on most vehicles.
Suspension Modifications
The OEM-type of suspension must be retained (i.e. McPherson Strut,double A-arm, etc.).Alternate control arms may be submitted for approval. Shocks andsprings are free, but must remain in stock location. Anti-sway barsare free. Bushings are free. Steering geometry may be modified to correct bump steer.
GT: The suspension pick-up points below the top of the tire may berelocated 25mm, and the suspension pick-up points above the tire maybe relocated 75mm.
Brake System Modifications
GT: OEM brake systems may be replaced with racing components. Themaximum rotor size in GT is 380 mm x 30 mm minimum thickness front and25 mm minimum thickness rear. The OEM caliper, any 4-piston caliper, or approved 6-piston calipersmay be used. Water may be injected into the brake ducts. ABS ispermitted. Carbon and Ceramic rotors are not permitted unless stockOEM components are being used.
GTS: Brake pads, fluid, proportioning valves and lines are unrestricted.ABS may be removed or deactivated. Some vehicles may be permitted aftermarketcalipers or rotors.
TC: Brake pads, fluid, proportioning valves and lines are unrestricted. ABS may be removed or deactivated. Some vehicles may be permitted aftermarket calipers or rotors.
Wheels
Wheel offset is free, provided the approved bodywork covers theportion of the tire that contacts the track.
GT: The wheel diameter used in the GT class is 18”. The maximum wheelwidth range from 9.5”-13” based on the tire size(s) permitted on eachcar. Magnesium wheels are permitted.
GTS: Wheel diameters range from 17” to 18”, widths from 8” to 11”.
TC: The wheel diameter used in the TC class is 17”. The maximum wheelwidth is 8”.
TCB: Required minimum wheel/rim diameter is fifteen inches (15”).Maximum wheel/rim width is seven inches (7”). Minimum wheel/rim weightis13 lbs.
Tires
Tires are Pirelli P Zero Racing Slicks, in widths ranging from 245mm to 315mm.
