The 4-cylinder engine features an all-aluminum crankcase and is lighter and more compact than a 6-cylinder engine. The turbocharger is a twin-scroll system. The exhaust streams out in two separate pairs of cylinders, flowing through the exhaust manifold and the turbocharger, then circulating to the turbine wheel.
The new Z4 sDrive28i will be offered with an eight speed automatic transmission and will offer a fuel efficiency gain of approximately 20% over the naturally aspirated engine it replaces.
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