2006 Subaru Impreza WRX STi spec C


2006 Subaru Impreza WRX STi spec C

The spec C is Subaru’s homologation model which features slight improvements over the standard spec model for racing in the Production World Rally (PWRC) and Group N rally. A minimum number of 1000 cars were needed to satisfy the requirements, so Subaru Technical Institute offered them to the Japanese market.

The big difference between a spec C and other WRXs is a substantial (90 kg) reduction in weight thanks to lighter glass, thinner roof construction and an aluminum trunk lid.

Benefiting the race cars, are new suspension pickups and beefier McPherson strut arrangements with braces to improve rigidity.

Other small details include, power window delete on the rear windows, manual control center of the center differential, larger disc brakes, ball bearing turbochargers, 12L tank for intercooler, transmission oil cooler, Fuel pump with rotating chamber, Air-cooled engine oil cooler, spec C exclusive front/rear stabilizer and a Roof ventilator.

To help increase sales of the spec C, a special RA-R version with a 320 bhp version was released in Nov of 2006.

In Detail

submitted byRichard Owen
engineEJ20 Boxer-4
aspirationTwin IHI, Ball Bearing Turbochargers
valvetrainDOHC, 4 Valves per Cyl w/AVCS VVT
fuel feedMultipoint Fuel Injection
displacement1994 cc / 121.7 in³
bore92 mm / 3.62 in
stroke75 mm / 2.95 in
compression8.0:1
power205.8 kw / 276 bhp @ 6400 rpm
specific output138.42 bhp per litre
bhp/weight165.77 bhp per tonne
torque422 nm / 311.3 ft lbs @ 4400 rpm
body / frameGH-GDB Unit Steel
driven wheelsAWD w/Driver Control Center Diff (DCCD), Front and Rear LSD
wheel typeBBS Forged Alloys
front tires235/45ZR17 POTENZA RE070
rear tires235/45ZR17 POTENZA RE070
front brakesDiscs w/ABS, EBD
f brake sizex 323 mm / x 12.7 in
rear brakesDiscs w/ABS, EBD
r brake sizex 312 mm / x 12.3 in
front wheelsF 43.2 x 20.3 cm / 17 x 8 in
rear wheelsR 43.2 x 20.3 cm / 17 x 8 in
steeringQuick Ratio Rack & Pinion
f suspensionMacPherson Struts w/Lower L Arms
r suspensionMacPherson Struts w/Trailing Arms
curb weight1665 kg / 3671 lbs
wheelbase2540 mm / 100 in
front track1491 mm / 58.7 in
rear track1496 mm / 58.9 in
length4465 mm / 175.8 in
width1740 mm / 68.5 in
height56.3 mm / 1425 in
transmission6-Speed Manual
gear ratios3.636:1, 2.375:1, 1.761:1, 1.346:1, 0.971:1, 0.756:1, :1
final drive3.900:1