The two-stage turbocharger housing is integrated with the exhaust manifold and contains two turbochargers of different sizes. The pair of turbine/compressor wheels is sequentially mounted and each is able to by-pass the input and output feeds of the other, while also being able to operate in tandem.

This arrangement is claimed to provide a driver with good, instant torque at low engine speeds - via the low-inertia small turbo when the exhaust pressure is light - and strong ‘top end’ power at higher revolutions, when the bigger turbo is engaged.

The Saab TTiD engine meets a growing demand from drivers unwilling to sacrifice performance in the interests of fuel economy. With power characteristics typical of a much larger engine, it is an example of Saab’s commitment to ‘right-sizing’, the achievement of ‘big’ engine performance without the usual drawbacks, such as extra weight, bulk and higher fuel consumption.

The Saab TTiD engine will be offered in Aero and Vector Sport specification levels. Available in spring 2008, it will join the current 120bhp (88 kW) and 150bhp (110 kW) 1.9 TiD engines, with a choice of six-speed manual or automatic transmissions.

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