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 by Richard Owen
engine EJ20 Boxer-4
aspiration Twin IHI, Ball Bearing Turbochargers
valvetrain DOHC, 4 Valves per Cyl w/AVCS VVT
fuel feed Multipoint Fuel Injection
displacement 1994 cc / 121.7 in³
bore 92 mm / 3.62 in
stroke 75 mm / 2.95 in
compression 8.0:1
power 205.8 kw / 276 bhp @ 6400 rpm
specific output 138.42 bhp per litre
bhp/weight 165.77 bhp per tonne
torque 422 nm / 311.3 ft lbs @ 4400 rpm
body / frame GH-GDB Unit Steel
driven wheels AWD w/Driver Control Center Diff (DCCD), Front and Rear LSD
wheel type BBS Forged Alloys
front tires 235/45ZR17 POTENZA RE070
rear tires 235/45ZR17 POTENZA RE070
front brakes Discs w/ABS, EBD
f brake size x 323 mm / x 12.7 in
rear brakes Discs w/ABS, EBD
r brake size x 312 mm / x 12.3 in
front wheels F 43.2 x 20.3 cm / 17 x 8 in
rear wheels R 43.2 x 20.3 cm / 17 x 8 in
steering Quick Ratio Rack & Pinion
f suspension MacPherson Struts w/Lower L Arms
r suspension MacPherson Struts w/Trailing Arms
curb weight 1665 kg / 3671 lbs
wheelbase 2540 mm / 100 in
front track 1491 mm / 58.7 in
rear track 1496 mm / 58.9 in
length 4465 mm / 175.8 in
width 1740 mm / 68.5 in
height 56.3 mm / 1425 in
transmission 6-Speed Manual
gear ratios 3.636:1, 2.375:1, 1.761:1, 1.346:1, 0.971:1, 0.756:1, :1
final drive 3.900:1