March 23, 2012  |   By Marshall Pruett - SPEED

Dallara DW12 Specifications

Courtesy of Speed.com

With the first race for the new Dallara DW12 package and turbocharged engine formula this weekend, get up to speed with the various technical changes and updated specifications in a SPEED.com exclusive:

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)

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)

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
Rear Upper Element Range: 10° to 46°
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

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)