NAIAS Highlights: Production
Subaru rallies around the Impreza
Drawing upon its extensive experience in rally car racing, Subaru developed the 2002 Impreza WRX sedan and Sport Wagon. Both all-wheel-drive WRX models are powered by a 169-kW (227-hp), turbocharged and intercooled 2.0-L engine that, according to Subaru, gives a better power-to-weight ratio than any Audi A4 Quattro model or all-wheel-drive BMW 3-Series. The horizontally opposed WRX engine uses aluminum-alloy construction for the cylinder block and heads. The turbocharger provides up to 102 kPa (14.8 psi) maximum boost, and the functional hood scoop supplies cool airflow for the intercooler. The standard five-speed transmission is teamed with full-time, viscous-coupling all-wheel drive. An optional four-speed electronic automatic transmission comes teamed with variable torque distribution, the most advanced all-wheel-drive system Subaru offers in the U.S.
Both models have a sport-tuned, four-wheel independent suspension for sharp handling response. The front suspension features a Subaru-optimized MacPherson strut layout, and the rear uses a redesigned, dual-link strut arrangement. The rear roll center was raised by 33 mm (1.3 in) on both models (to about the same level as the World Championship Rally Impreza) to improve stability and cornering performance. The sedan and Sport Wagon also include a viscous limited-slip rear differential that ensures that the rear tire with the best traction receives the most power, four-wheel disc brakes with twin-piston front calipers and 289.5-mm (11.4-in) front rotors, and engine-speed sensitive power rack-and-pinion steering with a load-sensitive power steering pump.
Both Impreza body types are based on a robust platform using the ring-shaped reinforcement frame body structure for added safety. A hydroformed front subframe along with tailor-welded blank B-pillars and side sills provide a strong structure that is stiffer in bending and twisting strength than the previous Impreza. The increased rigidity improves handling response and ride quality while helping to reduce interior noise.
The WRX sedan has a wide-tread, blister-fender design that was inspired by the Impreza World Championship Rally car. The Sport Wagon's body design is characterized by pronounced fender flares, instead of fender blisters, and a rear-gate spoiler. The rear quarter side glass overlaps the D-pillars, which gives the appearance of wraparound rear glass. Both models feature oval headlights, angled taillights, and a "turbo" front bumper cover with an air intake.
- Ryan Gehm
