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Chassis
- Name: Dallara DW12 (Original designation: Dallara IR12. 2011: IR07)
- Length: 5012.3 mm/197.3 in
- Width: 2011 mm/79.2 in
- Height: 1127.9 mm/44.4 in
- Track Width: 1940 mm/76.34 in maximum
- Wheelbase: Between 2997.2 mm and 3073.4 mm/118 and 121 in, depending on use of original or weight distribution correction a-arms
- Minimum Weight: 1565 (Originally stated weight: 1380. 2011 weight: 1565)
- Weight Distribution: 43% front/57% rear (approx.)
- Fuel Capacity: 18.5 gallons (Original amount: 19 gallons. 2011 fuel capacity: 22 gallons)
Clutch
- Type: Three-plate carbon with steel housing
- Vendor: AP Racing
- Model Number: CP8153-DE03
Transmission
- Type: Sequential
- Manufacturer: Xtrac
- Model Number: 1011
- Number of Gears: Six
- Shifting Actuation: Paddle
- Shifting Actuation System Vendor: MegaLine
Suspension
- Type (Front): Double A-Arm, pushrod, with third spring and anti-roll bar
- Type: (Rear): Double A-Arm, pushrod, with third spring and anti-roll bar
- Damper Vendors: Unrestricted, use of inerters within the damper housing permitted
Aerodynamics
- Type: Ground effects underbody used in conjunction with front and rear wings
- Front Wing Assembly: Fixed main element with second and third adjustable elements per side
- Front Second (middle) Element Range: -10° to +32°
- Front Third (top) Element Range: Three pre-set positions of 6.5°, 9.0° or 11.5°
- Rear Wing Assembly: Fixed main element with single adjustable upper element
- Wickers: 1 in maximum height
- Downforce: 4600 pounds at 200 mph (approx.)
- Drag: 1500 pounds at 200 mph (approx.)
- Strakes: One per tunnel
Brakes
- Type: Carbon discs and pads with monobloc aluminum calipers
- Supplier: Brembo
- Front/Rear Calipers: Six-piston design, with 28/30/36mm pistons
- Caliper Weight: 2.08 kg/4.58 lbs each
- Front/Rear Brake Disc Dimensions: 328 mm dia./12.9 in dia., 30 mm thickness/1.18 in thickness (minimum thickness: 19 mm/.75 in)
- Carbon Brake Pad Thickness: 24 mm/.94 in
- Carbon Pad Weight: 270 g/.59 lbs each
- Maximum Disc Operating Temperature: 900 C/1652 F
Electronics
- ECU Vendor: McLaren
- ECU Model Number: 400i
- Dash, Data Logging System and Chassis Wiring Loom Vendor: Cosworth Electronics
- Engine Loom: Vendor chosen by each manufacturer
- Drive-by-Wire System: Vendor chosen by each manufacturer
- Hand Clutch Vendor: AP Racing
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Engines
- Type: Single- or Twin-Turbocharged, four-cycle, four-valves-per-cylinder (2011: Naturally aspirated)
- Designations: Chevy IndyCar V6 (Chevrolet), HI12R (Honda), DC00 (Lotus)
- Displacement: 2200 cubic cm/134.2 cubic in (2011: 3500 cubic cm/213.6 cubic in)
- Cylinders: maximum of six (2011: eight)
- Camshafts: Maximum of four
- Crankshaft: One-piece, no lower than 100 mm above the bottom of the chassis
- Valves: Two inlet, two exhaust (mechanically-operated, only. Variable valve timing not permitted)
- RPM: 12,000 maximum
- V Angle: 60° minimum, 90° maximum
- Bore: 95 mm dia. maximum
- Stroke: Unsupplied
- Compression ratio: Unsupplied
- Turbocharger Vendor: BorgWarner
- Turbocharger Model Numbers: EFR9180 (single), EFR6758 (twin)
- Turbocharger Weights: 8 to 8.71 kgs/17.6 to 19.2 lbs (single, depending on the turbine housing used), 4.91 to 5.1 kgs/10.8 to 11.2 lbs (twin, depending on the turbine housing used)
- Turbocharger Boost Level: 22.47 psi
- Wastegate: Maximum of two, electronic or pneumatic controlled, vendor chosen by each manufacturer
- Ignition: Coil-based, vendor chosen by each manufacturer
- Exhausts: As built and homologated by each manufacturer
- Fuel injectors: Maximum of two per cylinder, vendor chosen by each manufacturer (Direct injection permitted)
- Spark plugs: One per cylinder, vendor chosen by each manufacturer
- Weight: 112.5 kgs/248 lbs (2011: 124.7 kgs/274 lbs)
- Length: 460 mm/18.1 in
- Banned Engine Materials: Alloys containing more than 3 percent/weight beryllium, iridium or rhenium, metal matrix composites, magnesium-based alloys, inter-metallic materials
- Horsepower: 550 to 700 (quoted)
- Torque: 300 lb-ft (approx.)
- Push-to-Pass: Not permitted. Future use of 100 hp (road/street course) and 50 hp (oval) boosts possible
- Fuel pump: Supplied by Dallara
- Fuel pressure: Maximum 300 bar
- Fuel: E85 Ethanol
- Fuel Mileage: 3 mpg approx. (2011 mpg: 2.5)
Wheels
- Type: Single lug
- Vendors: BBS, OZ, Avus
- Front Dimensions: 10 in wide x 15 in diameter
- Rear Dimensions: 14 in wide x 15 in diameter
- Wheel Nut Torque: 430 lbs
Tires
- Type: Slick
- Supplier: Firestone
- Front Tire Dimensions: 10.0/25.8R15 (Road and street course)
- Front Tire Weight: 18 lbs
- Rear Dimensions: 14.5/28.0R15 (Road and street course)
- Rear Tire weight: 23 lbs
- Tire Allotment: 9 sets per weekend, 5 sets primaries, 3 sets alternates, 1 set used primary (2011: 9 sets per weekend, 6 new primary, 3 sets alternate)
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