Meanwhile, the five-door hatch and Sports Tourer estate will get some cosmetic changes and will feature in a revised Astra range that arrives in dealers this September. Badged 2.0 CDTi BiTurbo, the new engine is also likely to spread to the other bodystyles in the range, although Vauxhall won’t yet confirm that.
The twin-turbo-diesel for the GTC is borrowed from the Insignia, where its blend of power and fuel economy make it one of Vauxhall’s best diesels.
In the GTC it makes 192bhp and 295lb ft of torque and boasts a top speed of 139mph and a 0-60 of 7.8sec, which make it the fastest diesel in the GTC range and comparable to many rivals’ turbocharged petrol models. The other important figures are 139g/km of tailpipe carbon and 53.3mpg fuel consumption.
Badged 2.0 CDTi BiTurbo, the new diesel features sequential turbos with the smaller blower spinning-up rapidly and providing up to 258lbft of torque form 1500rpm. The second, bigger turbo starts working in the mid range, from 1750rpm to 2500rpm, adding an extra 37lbft.