The Subaru STI WRX – Paris Motor Show


October 6, 2014 By Mike Lee
Last updated on August 5, 2015

WRX STI – Ever more efficient and exciting!

When the latest generation WRX STI was launched, it had a dual mission: embody a high-performance version of the Impreza and win the World Rally Championships. Since its launch, the WRX STI has consistently lived up to expectations. It regularly achieves the highest results in the WRC, including becoming the first Japanese car to win the world championship three times in a row.

Successive models of the WRX have always been designed to reconcile absolute performance and driving comfort, which only an authentic sports saloon can do. Launched in the spring of 2014, the WRX STI keeps the same approach, exploiting better than ever the torque and power of the turbo-boosted Boxer engine. A feeling of maximum driving precision is given by the chassis and drive trains. The body is lighter and stiffer and the chassis reinforced.

During the development of this new model, Subaru aimed at the highest level of precision and driving pleasure. Numerous, long series of tests were conducted in various situations and countries. As for previous generations of the WRX STI, some of these tests were done at the Nürburgring track, known for its demanding route. Throughout these long and rigorous trials, Subaru pushed the characteristics of the body, chassis and other parts of the vehicle to the limit, to ensure a uniform whole. The very direct steering and firmer, but comfortable suspension, offer the driver a very sharp driving sensation. The chassis makes optimal use of the potential of the Subaru AWD and of the finger-tip control. For Subaru, a sports car is not just synonymous with maximum performance or power. What is essential is that performance goes hand in hand with the driver’s trust in the car even when it is pushed to its limits. The direct and faithful reactions of the WRX STI form the basis of this trust and the pleasure experienced at the wheel.

The main modifications made to the chassis of the new WRX STI

Steering

The hydraulic power steering has a torsion bar that is 125 % more rigid.

Compared to the previous model, the steering ratio goes from 15:1 to 13:1.

Compared to the previous model, the support bearings for the gearbox are

400 % more rigid for more accurate reactions.

Front suspension

The cross-arm has been stiffened.

The lower arm bearing has been stiffened.

The diameter of the stabilizing bar has been increased from 21 to 24 mm.

Spring stiffness has been increased by 22 %.

Lateral rigidity has been increased by 14 %.

Overall roll resistance has been improved by 24 %.

With a highly elaborate all-wheel drive (front differential with Helical LSD, Torsen LSD at the rear), the STI has an exclusive combination of extremely sophisticate systems including multimode VDC (Vehicule Dynamic Control) and DCCD (Driver’s Control Center Differential). The extremely wide range of settings offers all the handling possibilities that could possibly be

dreamt of. The SI Drive allows three engine operation modes to be configured: Intelligent, Sport or Sport Sharp. Thus, drivers can ideally adapt the WRX STI to their own aspirations and driving conditions.

Specs:
Engine: 2457cc 4 cylinder DOHC 16-valve turbocharged
Power: 221 PS / 407 Nm
0-100 km/h: 5.2 seconds
Top Speed = 158 mph
Drivetrain: AWD
Kerb weight = 1500kg