Upgrades For 2005 Subaru Impreza Range - Type UK Special Features | Part Four

‘Type-UK’ Special Features

The STi is designated and badged ‘Type-UK’ to distinguish it from unofficial imports which do not have the additional features standard on the British versions.

These include a Category One alarm/immobiliser, a special satellite tracking system, enhanced rust proofing to cope with the harsh UK weather, locking wheel nuts and window etching.

Visual differences to the regular WRX include special gold-coloured spoked alloy wheels, colour-keyed sill spoilers and an interior featuring blue suede-effect seats with STi logos.

Also inside is a switch to spray the intercooler with water to retain power during high-temperature/altitude driving. Another device allows the driver to preset a warning buzzer and light to guard against over-revving the engine.

On opening the bonnet, the engine compartment greets owners with a dramatic mixture of colours and detailing. The intake manifold, for example, is painted in red and the enlarged aluminium intercooler emblazoned with ‘STi’ lettering.

The STi has a top speed of 151.5 mph and 0-60 time of 5.2 seconds from an engine which has been specially developed to meet European Community Whole Vehicle Type Approval standards - unlike the Japanese home-market STi.

Tuned by Subaru Tecnica International Inc, up to 80 per cent of the STi’s all-alloy engine is new compared to the standard turbocharged 2.0 litre four-cam ‘boxer’ unit as fitted to the regular Impreza WRX.

Engine strength and rigidity are boosted by using semi-closed-deck cylinder blocks, reshaping the piston head, fitting screw-in type connecting rods and using forged pistons and shimless valve lifters. Also aimed at high-rev durability are sodium-filled exhaust valves and hollow intake valves.

A larger intercooler and air intake provide better cooling and a special intercooler water spray is fitted, operated by the driver with the water tank fitted in the boot.

Also specially fitted to the STi is Subaru’s Active Valve Control System - variable valve timing – which ensures maximum engine response over a wide rev-range.

The result is a maximum power output of 265 PS (261.5 bhp/195 kW) at an accessible 6,000 rpm and 253 lb ft (343 Nm) torque at an equally usable 4,000 rpm.

continues... | Part Five
Published 17 September 2004 Melanie Carter

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