PRO FWD Class (72mm max. turbo size)

Ladder Type: Pro

Field Size:       Up to 32 qualifying cars

Qualifying:     3 scheduled rounds for 1-day events, 4 rounds for 2-day events

Light Type:     0.400 Pro

Staging:          Courtesy Staging Encouraged, Deep Staging Allowed

Min. Qualifying Time:           10.99 seconds (11.99s at Bandimere Raceway)


Class Summary

Arguably the most popular heads-up category in import drag racing today, the Turbo by Garrett IDRC PRO FWD Class showcases the epitome of turbocharged FWD unibody racecars. The IDRC fosters the growth of this class by providing a 32-car field size. In addition, the IDRC allows for a wide variety of competitive platforms by providing a minimum vehicle competition weight based on turbocharger size. This also increases the safety of vehicles by limiting the amount of ballast required for lighter chassis vehicles. Wheelie bars, one-piece front ends or polycarbonate windows (i.e. Lexan®) are not allowed in the class. Top-running vehicles in this class will deliver mid-8-second blasts at trap speeds approaching 180mph.

Eligible Platforms

Any import or domestic sport FWD compact platform is allowed with a transverse-mounted, inline-4 or V6 engine. Single or twin-turbochargers are allowed, pending the vehicle weight-to-turbo inducer size is maintained (see “Turbo Sizing / Minimum Competition Weight” subheading for additional information). Nitrous oxide systems are also permitted, but a weight penalty of 150 pounds will be assessed when bottle or solenoid components from a nitrous oxide system are present on the vehicle (nozzles may remain in place if lines to nozzles are removed).


All vehicles must have functional taillights and at least one functional headlight. Fiberglass, fiber-reinforced plastic (FRP) and carbon- or aramid- (Kevlar®) fiber body panel replacements are allowed. One-piece front ends and polycarbonate windows (i.e. Lexan®) are not allowed in the class. Both doors must be functional, with the ability to open the doors from the inside and outside of the vehicle.

Chassis and Suspension

“Full tube chassis,” “3/4 chassis” and “1/2 chassis” conversions are not permitted. Vehicle must remain unibody with all factory shock towers functional in the OEM location. Rear suspension must remain the same design as OEM. If the rear suspension was originally Independent Rear Suspension (IRS), it must remain IRS. Driver position must be in OEM location (i.e. no center-driver conversion permitted). Wheelie bars are not permitted.


OEM and IDRC approved 4- and 6-cylinder OHC engines are allowed. Currently the DART B-series engine is the only approved non-OEM engine. Racers wishing to certify other non-OEM engine platforms must submit a request for approval to the IDRC technical department. Engine “swaps” are allowed, as long as the swap is from the same manufacturing group (i.e. Honda/Acura, Toyota/Scion/Lexus, Nissan/Infiniti, etc.). Billet engine blocks or cylinder heads are not permitted. Cast aftermarket cylinder heads are permitted. Engine location may be setback up to six inches from the original location. Engines MAY NOT run an aftermarket dry sump oil system in this class. Engines may run only distilled water for coolant. Up to 16 ounces of surface-tension reducer (i.e. Royal Purple Purple Ice additive) per cooling system is permitted. No ethylene glycol or propylene glycol coolants are allowed.

Intercooler Systems

Either an air-to-air or air-to-liquid intercooler system may be used.

Approved Fuels

Pump E85, E98, VP Racing C16, VP Racing Pro Import, VP Racing Q16, VP Racing C85. No propylene oxide or nitromethane is permitted. IDRC will perform random fuel tests and fuel tests upon protest (charges apply).

Transmission and Axles

Open to OEM manual or OEM automatic transmissions only. Case may be upgraded to a billet version. Gearsets and internals can be upgraded to straight-cut and/or dog engagement H-pattern. No sequential conversions allowed. Aftermarket axles are highly encouraged with hub upgrades permitted.

Fuel Cells

Permitted when properly mounted per NHRA/IHRA safety regulations.


Any exit location that doesn’t interfere with the staging lights is permitted.

Nitrous Oxide Systems

Allowed with a 150-pound minimum vehicle weight penalty. Nitrous solenoid must be a cross-flow design (no bottom dump) with a maximum orifice size less than 0.080”. This includes Nitrous Supply #26020 Powerstar, Nitrous Express NX Mainline, NOS #18020 Powershot, ZEX NMU (#82007 or #82008).

Wheelie Bars

Not permitted.


Slicks limited to 25.0-inch in height and 9.5-inch in width.

Turbo Sizing / Minimum Competition Weight

All inline-4-cylinder engines must run single turbochargers. V6 engines may run twin turbocharger configurations. No compound turbo systems allowed on twin-turbo setups. Turbocharger inducer must be within 0.5mm (0.020”) of the set limit on single turbo applications and within 0.25mm (0.010”) on twin-turbo applications. For example, a vehicle not using a nitrous-oxide system and weighing 2,450 pounds could have a turbo with an inducer that measures 72.49mm or less. Upon a protest, a turbocharger will be measured by an IDRC tech official.

Minimum       Single              Twin

Weight*          Turbo             Turbo (V6)

2,390 lbs.       72.0mm          51.0mm x 2

2,325 lbs.       71.0mm          50.0mm x 2

2,260 lbs.       70.0mm          49.5mm x 2

2,195 lbs.       69.0mm          49.0mm x 2

2,135 lbs.       68.0mm          48.0mm x 2

2,070 lbs.       67.0mm          47.5mm x 2

2,010 lbs.       66.0mm          46.5mm x 2

1,950 lbs.       65.0mm          46.0mm x 2

*Add 150 pounds to minimum weight when a nitrous oxide system is fitted to the vehicle.

All vehicles in the class are subject to inspection to ensure that the team is correctly reporting the turbocharger sizing. Use of a larger-than-specified turbocharger will result in a disqualification and forfeiture of all winnings from the event upon the first violation.

All vehicles must weigh-in after a qualifying run to ensure that the minimum weight was not violated during the run. The vehicle must make its way to the scales under its own power or with an IDRC supervised tow. This eliminates the possibility of teams adding weight between the end of the run and the scales.


All crewmembers accompanying the vehicle on track (up to three) must be in like uniforms. Uniforms can be as simple as matched t-shirts and jeans. All crewmembers must also sign the additional liability release waiver.


Class payouts will vary based on each event. However, larger fields will receive larger payouts. Fields smaller than eight vehicles will receive a pro-rated payout based on the number of qualified entries. Eight-vehicle fields will only payout winner and runner-up. Fields with 16 and 32 cars will also payout semifinalists.

IDRC West Coast Nationals & International Finals (1day event)

32-Car Field16-Car Field8-Car Field