Completely Revised Suspension
The 2005 Impreza WRX STi also has a completely revised suspension with new geometry including a caster angle raised by 1.5 degrees and a 15 mm wider rear track and 10 mm longer wheelbase.
Spring and damper rates have been retuned and the front and rear lateral links are now made from aluminium to reduce unsprung weight. Also changed are the anti-roll bars which are now bigger, further reducing body roll and increasing handling sensitivity.
In addition, the suspension mounting points are more rigid including the support arm for the front cross-member and jack-up plate which are now a single unit.
Even the front axle hub units and housings have been redesigned to improve the capacity of the wheel bearings, while the rear differential cushion rubber has been uprated to increase handling stability.
The Impreza WRX STi’s steering has also undergone engineering refinement, making for greater precision and feedback. This is achieved by using a cannon mount-type attachment for the steering gearbox.
Meanwhile, a special damper valve has been added to the system which reduces kick-back during hard cornering or when driving on a bumpy road.
Other technical changes include the fitment of engine and floorpan underfloor covers to improve the aerodynamics.
New, High-Quality Interior
Like the rest of the ’05 Impreza range, significant changes have been made to the interior to enhance the ambience while retaining the Impreza STi’s sporty character.
Specific new features for the STi include a new design of gear lever and three-spoke steering wheel.
Even the seat trim has come in for re-examination, and while the popular blue suede-effect centre section with red STi logos continues, the black cloth covering the side supports is now of a richer, more grippy material.