Vauxhall have introduced the Astra BiTurbo 5-door Hatch and Sports Tourer, priced from £24,095.
Both versions are powered by a BiTurbo diesel engine producing 195PS and delivering 400Nm torque. This equates to a 0-60 mph time of sub-eight seconds and a top speed of over 135 mph.
Twin turbo technology is rare in this class and the Astra uses a sequential turbocharging system, with the smaller turbo accelerating quickly at lower speeds to eliminate ‘lag’, providing 320Nm of torque from 1,250rpm. In the mid-range of rpm, both turbochargers operate together, with the larger turbocharger pre-compressing the intake air, before it is fully compressed in the smaller one. A bypass valve is controlled continuously to pass on part of the exhaust gases to the larger turbo. As a result, the driver still enjoys smooth acceleration. At higher rpm (from around 3,000rpm) all the gases flow directly to the larger turbocharger, maintaining the fluid power delivery at higher speeds.
Available to order tomorrow, with first deliveries expected late 2012, prices start from £24,095 for the BiTurbo 5-door Hatch and from £25,110 for the Astra BiTurbo Sports Tourer
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