As expected, the engine replaces the normally aspirated 3.0-liter inline-6 that it replaces in the Z4 sDrive30i. The new engine delivers normally aspirated 3.0-liter inline-6 that it replaces in the Z4 sDrive30i and it also peaks 1,500 rpm earlier. Regarding the fuel consumption, Bmw expects a fuel efficiency gain of approximately 20% over the naturally aspirated engine when mated to the 8-speed automatic transmission.

“The 4-cylinder engine with its all-aluminum crankcase is lighter and more compact than a 6-cylinder engine of equivalent power. The turbocharger is a twin-scroll system. The exhaust streams leaving the two pairs of cylinders are kept completely separate as they flow through the exhaust manifold and the turbocharger, taking a spiral path to the turbine wheel. This configuration results in very low exhaust back pressure at low engine rpm, and allows the energy of the exhaust gas pulses to be optimally managed and translated into powerful rotation of the turbine blades, without a delay in throttle response.” says Bmw about its engine.