The Opel Astra line-up is being enhanced with a new diesel spearhead of power: the four-cylinder 2.0 BiTurbo CDTI engine with 195 hp and 400 Nm maximum torque. It is available in three body styles: the five-door hatchback, the GTC coupe and the Sports Tourer station wagon. The five-door Astra BiTurbo CDTI achieves a top speed of 226 km/h, making it the fastest Astra diesel ever (Sports Tourer 222 km/h, GTC 223 km/h). While providing powerful performance and driving fun, the BiTurbo engine is also highly efficient. In combination with fuel saving Start/Stop technology which is standard across all Astra BiTurbo models, the GTC only uses 4.9l/100 km (Sports Tourer and five-door 5.1 l/100km) Emissions for the GTC are 129 g/km (134 g/m for the hatchback and station wagon).
Depending on the load range in the Astra BiTurbo four-cylinder diesel engine, two turbochargers of different sizes work either separately or together. The smaller turbocharger accelerates especially quickly at low engine speeds. This means the accelerator pedal responds well and the undesired “turbo lag” effect is prevented. Starting at 1250rpm, the driver can already draw on 320 Nm – this is 80 percent of the maximum torque of 400 Nm which is available between 1750 and 2500 rpm.
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 3,000 rpm) all the gases flow directly to the larger turbocharger, maintaining the fluid power delivery at higher speeds.
The main focus in the development of the 2.0 BiTurbo CDTI engine was to ensure a rapid build-up of charge air pressure in the low rpm range, while giving the accelerator responsiveness in the mid rpm range. The engine air is ideally adjusted according to the rpm range and the needs of the two turbochargers of different size. At low rpms an additional cooler that is exclusively linked to the small turbocharger ensures that the small volume of air passes in a direct path to the combustion chamber. In the mid rpm range, the bigger and more powerful turbocharger becomes increasingly involved. Its larger stream of air is cooled by a bigger cooler.
The new BiTurbo high performance diesel variants of the five-door, Sports Tourer and GTC have been given an even a sharper and more aggressive exterior appearance varying from body style to body style and adapted to each specific model. The front fascias of the BiTurbo Astra body versions (GTC, Sports Tourer and five-door) underscore the cars’ high performance and more aggressive nature. The upper grille has a similar shape as the one used on the Astra GTC, however the front bar is always in body color and the five-door hatchback and Sports Tourer BiTurbo models feature the new wing-shaped bar across the grille.
The lower air intake area has also been given a sporty design treatment: the area where the central grille merges into the outer grille has been sculpted in a shark-fin like shape, making the car appear more aggressive. The entire side window surround of the five-door and Sports Tourer models is in chrome., while in the case of the GTC Biturbo the lower window insert is black. In all variants, there are two exhaust tail pipes at the rear as well as a pronounced rear bumper shape that is specifically adapted to the model. These features give the car an added muscular stance.
Inside the cabin of the Astra BiTurbo variants, JetBlack colored fabrics or leather are combined with Magic Red in the edge of the seats. Magic red stitching and seams in the seats, door inserts and the gear shifter boot add to the sporty atmosphere of the interior. A new flat bottom leather steering wheel and special floor mats with red surrounds are other sporty components of the Astra BiTurbo cabin.