Subaru has at last revealed details of its hardcore new Impreza WRX STI which is substantially different to the non-turbo five-door models now being delivered to first customers.And with a heavily-revised new 296 bhp turbocharged 2.5 liter 'boxer' engine, totally new platform and suspension plus even more advanced symmetrical all-wheel drive system, the World Rally Championship look-alike is sure to satisfy Subaru traditionalists.
At the rear, four exhaust pipes twinned in pairs at either side of the body not only give a distinctive look but reduce exhaust air-flow resistance by 38 per cent, increasing power and reducing noise.
Comfort With Agility
The new Impreza WRX STI boasts a much plusher interior than before, offering leather/Alcantara-covered sports seats as standard with Recaro seats as an option. Curtain airbags are standard and the audio system has been upgraded.
The braking system has been developed in conjunction with Italian specialist, Brembo, and features four-pot calipers at the front and twin-pot at the rear - both ventilated discs.
A multi-mode Vehicle Dynamics Control System allows the driver to select the best setting for the prevalent road conditions. For example, it can be turned off altogether or set to 'Traction' which delays artificial interference.
More Power, More Driver Involvement
The award-winning 2.5 liter horizontally-opposed 'boxer' engine benefits from a thorough revision which includes a larger and more efficient intercooler which increases power.
The new STI also boasts stronger low to mid-speed torque thanks to variable-valve timing for the intake and exhaust system and a fast-warm catalytic converter for reduced emissions.
Power is now 296 bhp at 6,000 rpm with torque of 300 lb-ft at 4,000 rpm.
The much-praised six-speed manual transmission has been revised, with a shorter-throw gear-change and lighter movements, especially from neutral to 1st and 1st to 2nd gear thanks to a revised synchromesh.
A firm favorite with existing STI owners, the Driver's Control Centre Differential has been improved, giving even more choice of handling characteristics.
The DCCD is operated via a switch in the centre console, allowing the driver to manually select the torque distribution front to rear, reverting to automatic mode every time the ignition is switched off.
For example, he or she can choose between having a sharper cornering turn-in or more stable straight-line running.
In Manual Mode, the driver can adjust the front to rear torque distribution through varying degrees to suit different road conditions such as loose gravel or soft snow.
Now, for the new Impreza WRX STI, the DCCD switch also allows the selection of three different types of 'Auto' Mode.
1: Auto Mode is selected when the engine is started and covers most road conditions.
2: Auto+ Mode places the emphasis on traction for slippery roads, sharing out the torque more evenly between all four wheels and enhancing straight-line stability.
3: Auto- Mode increases agility by enhancing steering response through less torque-split interference.
Subaru Impreza 2.5 STi
Source : rsportscars.com
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