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J275

Class Designations: JT preceded by car number. - Updated 29/7/16

J275 will utilise a Heads Up Pro Tree start and will race using a Chicago Shootout format for field sizes of 16 and under or elimination style for fields over 16. Tyres must be stamped 275 or less on sidewalls and be of radial construction. Must have a metric stamping.  A minimum qualifying ET of 9.50 sec is required to compete. It is designed for full-bodied RWD vehicles using 4-cylinder or 5-cylinder engine or 6-cylinder engine or V8 engine or 2-rotor or 3-rotor engines. Chassis limited to back half modifications.  Maximum of 2 power adders permitted.  All vehicles must have a current relevant ANDRA or IHRA Tech Inspection and meet ANDRA or IHRA Safety requirements for the performance of the vehicle. Subject to track Sanctioning Body. ANDRA track needs ANDRA Licence and Tech. IHRA track needs IHRA Licence & Tech.

CLASS REGULATIONS

While having weight breaks is a great idea in theory, in reality it’s hard to come up with a perfect system.  So what we've decided to do is drop the weight restrictions for the moment and monitor the weights of every vehicle over the next couple of events.  That way we can develop a very clear picture of where the weights need to be. If we get at least 24 competitors in J275 we'll look at running the quickest 8 cars in a Pro class much like we do with Street 289/Pro 289.

Minimum Weights

4 Cyl, 6 Cyl (All Combos):
2200 lbs.- w/ turbo or nitrous up to 2200cc
2300 lbs.- w/ turbo or nitrous 2200cc to 2550cc
2400 lbs.- w/ turbo or nitrous 2550cc to 2850cc
2525 lbs.- w/ turbo or nitrous 2850cc to 3150cc
2625 lbs.- w/ turbo or nitrous 3150cc to 3450cc
2700 lbs.- w/ turbo or nitrous 3450cc and up

2 & 3 Rotor:                                               
2200 lbs,- 2 Rotor w/ turbo or nitrous
2250 lbs,- 3 Rotor w/ nitrous
2500 lbs,- 3 Rotor w/ turbo

V8’s
All Carbureted V8’s must run at least 1 power adder. (i.e. Nitrous, turbocharger or supercharger)

Small Blocks (NA, Nitrous & Supercharged):
2200 lbs.- Small Blocks Naturally Aspirated (EFI ONLY)
2550 lbs.- Small Blocks w/ Nitrous
2850 lbs.- Small Blocks w/ Roots or Supercharger Centrifugal
 
Big And Small Blocks (Turbocharged ):
3000 lbs.- Small Blocks  w/ Single Turbo up to 85mm
3175 lbs.- Small Blocks  w/ Single Turbo 85mm up to 105mm
3350 lbs.- Small Blocks  w/ Single Turbo 105mm up
3300 lbs.- Big Blocks w/ Single Turbo up to 85mm
3450 lbs.- Big Blocks w/ Single Turbo 85mm up to 105mm
3600 lbs.- Big Blocks w/ Single Turbo 105mm up
3000 lbs.- Small Blocks w/ Twin (up to 64.000mm) Turbos
3175 lbs.- Small Blocks w/ Twin (64.001 - 74.000mm) Turbos
3350 lbs.- Small Blocks w/ Twin (74.001 - 84.000mm) Turbos
3500 lbs.- Small Blocks w/ Twin (84.001 - 95.000mm) Turbos
3300 lbs.- Big Blocks w/ Twin Turbo (up to 64.000mm) Turbos
3450 lbs.- Big Blocks w/ Twin Turbo (64.001 - 74.000mm) Turbos
3600 lbs.- Big Blocks w/ Twin Turbo (74.001 - 84.000mm) Turbos

Big Blocks (NA, Nitrous & Supercharged):
2500 lbs.- Big Blocks Naturally Aspirated up to 650ci  (EFI ONLY)
2550 lbs.- Big Blocks Naturally Aspirated 651ci - 700ci (EFI ONLY)
2600 lbs.- Big Blocks Naturally Aspirated 701ci - 750ci  (EFI ONLY)
2650 lbs.- Big Blocks Naturally Aspirated 751ci & up  (EFI ONLY)
3350 lbs.- Big Blocks w/ Nitrous up to 650ci
3450 lbs.- Big Blocks w/ Nitrous 651ci - 700ci
3550 lbs.- Big Blocks w/ Nitrous 701ci - 750ci
3650 lbs.- Big Blocks w/ Nitrous 751ci & up
3350 lbs.- Big Blocks w/ Roots or Centrifugal Supercharger
 
Add:
100 lbs. For nitrous with a Turbo or Supercharger.
50lbs. For wheelie bars
100 lbs. For any v8 clutch assisted manual transmission
100 lbs. for non-factory rear suspension (i.e. ladder bars or non factory 4 link)

Deduct:
100 lbs. For single -4 line minimum length of on nitrous combos
50lbs. for leaf springs
100 lbs. For IRS rear suspension
 
All weights include driver, verified after the run.  ALL VEHICLES MUST BE WEIGHED AFTER EVERY RUN INCLUDING QUALIFYING. The Jamboree reserves the right to amend weights in order to maintain parity in the class.  Ballast permitted. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

PLEASE NOTE THAT THESE WEIGHTS ARE A STARTING POINT AND WE'LL BE MONITORING THEM AT EACH EVENT TO MAINTAIN PARITY.  

ENGINE

Cooling System: Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Engine: Any automotive type engine permitted.  Any engine modification permitted.  Maximum of 2 power adders allowed.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Exhaust: Open exhaust permitted except where prohibited by track rules. All exhaust outlets must comply with current track sanctioning Body General Regulations.  All turbocharged vehicles without mufflers must have two diffuser bolts through exhaust pipe outlet. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Fuel: Restricted to pump, racing petrol or methanol only.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Fuel System:  Replacement fuel cell permitted. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Intercooler:  Permitted. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Liquid Overflow: Required.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Lower Engine Containment Device: Required on all piston engine vehicles using power adders quicker than 9.00 sec on the 1/4 mile.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Nitrous Oxide: Permitted.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Turbocharger, Supercharger: Permitted.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

DRIVELINE

Auto Trans/Converters: Refer track Sanctioning Body General Regulations - ANDRA or IHRA
Clutch: Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Driveline: Drive-shaft loop required on all vehicles. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Flywheel: Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Flywheel Shield: Required on all Manual transmission equipped vehicles. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Rear Axle: Spools permitted.  All supercharged or Turbocharged vehicles quicker than 7.50 sec are required to use fully floating rear hubs.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Transmissions: Any transmission permitted. Automated, timer-type, electric, electronic, hydraulic, etc. shifting mechanism prohibited, each shift must be a function of the driver and controlled manually. (Driver must pull the lever) Trans brakes permitted. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

BRAKES AND SUSPENSION

Brakes: Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Steering:  Aftermarket steering gear permitted. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Suspension: Any type of automotive suspension is permitted.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Wheelie Bars: Permitted.  Any adjustability during run prohibited, must be fixed during run.  Hydraulics, pneumatics, electronics, etc. prohibited. Wheelie-bar wheels must spin free at the starting line before launch.  Any preload prohibited. 

BODY AND CHASSIS

Airfoils / Wings / Spoilers: Permitted.  Airfoils / Wings / Spoilers may NOT be wider than the widest part of the vehicle body.  Any movement or adjustment during a run is prohibited.

Body: Any automotive or light truck body permitted. OEM body must be used with mild customising permitted.  Must retain full-bodied size and appearance, with minimum 2 functional doors.  Notching of OEM firewall permitted for engine and bell housing clearance.  Lightweight bonnet, guards, doors, bumpers and boot permitted only.  Maximum front overhang 45 inches (1143mm) measured from front most part of vehicle to the centre of front axle.

Chassis: Limited to back half chassis replacement only from the B pillar back and full roll cage mandatory with bracing from front suspension towers to roll cage permitted.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Wheelbase: Must retain original wheelbase of vehicle plus or minus 3 inch (75mm).  Maximum wheelbase variation from left to right is 1 inch (25.4mm).

Windshield/Windows: May be replaced with lexan or plexiglass with a minimum thickness of 3mm.

WHEELS AND TYRES

Tyres: Tyres must be stamped 275 or less on sidewalls and be of radial construction. Must have a metric stamping.
 
Wheels: Must be suitable for street or racing use. Use of temporary replacement wheels or space savers are prohibited. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Interior

Interior: Optional.  Minimum of a drivers seat required. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

ELECTRICAL

Batteries: Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Computer: Aftermarket and piggy back computers permitted. Data loggers permitted.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Delay Devices: Not permitted.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Ignition: Aftermarket ignition systems permitted. Rev limiters and two steps permitted. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Light Lighting: Headlights may be painted on.  Operational taillight required.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

DRIVER AND SAFETY

Tech Inspection: ANDRA or IHRA tech inspection required. Subject to track sanctioning body.  ANDRA tracks require ANDRA tech. IHRA tracks require IHRA tech. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Arm Restraints/Window Nets: Required.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Fire Extinguisher System: Permitted.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Head Protector: Required.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Helmet: Required. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Licence Requirements: Must have ANDRA UDL as a minimum or equivalent IHRA licence. Subject to track sanction requirements. ANDRA tracks require ANDRA UDL. IHRA tracks require IHRA licence.  Refer ANDRA or IHRA General Regulations

Neck Collar: Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Parachute: Compulsory on all vehicles exceeding 140 mph (224 kph) Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Protective Clothing: As required for vehicles running 10.99 sec as a minimum.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA

Safety Belts: Minimum of four-point harness required. Refer track Sanctioning Body General Regulations - ANDRA or IHRA

GENERAL

Sponsor Decals: All racers must display the event and class sponsor decals on both sides of the race vehicle at all times during the event.  Decals must be in a prominent location above the height of the wheel arch, clearly visible as required by The Jamboree AUS Pty Ltd.  Failure to do so will forfeit any prize purse posted and may lead to disqualification.

Tow Vehicles: Permitted.  Refer track Sanctioning Body General Regulations - ANDRA or IHRA