Small turbo (in green) spins up at low revs to counteract lag
When both turbos work in unison, the maximum torque of 295lb ft arrives
The larger turbo works on its own above 3000rpm to maintain performance
The Vauxhall Insignia is now available with the Luton marque’s most powerful diesel engine, a twin-turbo unit that produces 198bhp and 295lb ft.
The car, known as the Vauxhall Insignia BiTurbo, comes in either a five-door hatch or sports tourer body and will be available with either four-wheel drive or front-drive only.
Under the bonnet, the twin-sequential turbocharged diesel is based on the existing 1956cc unit that powers models in the Insignia, Astra and Zafira Tourer range.
In BiTurbo form – where a smaller turbo accelerates more quickly at lower revs to elminate lag and a larger turbo kicks in at higher engine speeds – the engine produces up to 35bhp more power and a 37lb ft. The maximum 295lb ft of torque arrives between 1750-2500rpm, when both turbos are working together.
In five-door hatch, front-wheel drive configuration, the Insignia BiTurbo will cover 0-60mph in 8.2sec. That variant of the car, which features standard start-stop, returns a claimed 57.6mpg and CO2 emissions of 129g/km.
Vauxhall’s FlexRide adaptive damping is standard on all Insignia BiTurbos. The system is normally a £790 option on front-wheel drive Insignias.
The Insignia BiTurbo will be available in SRi, SRi Vx-line and Elite trims, priced from £27,120 on the road for the SRi 2.0CDTi S/S version. The lowest-priced 4x4 variant will cost £29,725.