Videos: 2012 BMW Z4 sDrive28i with four-cylinder engine

Starting this fall, BMW of North America will introduce an update to the BMW Z4 sDrive28i model. The change comes from underneath the hood where BMW replaces the six-cylinder natural aspirated engine with a new four-cylinder turbocharged unit.

The replacement powerplant provides equivalent or better performance, refinement, and smoothness with two fewer cylinders. Like the Z4′s last TwinPower Turbo 3.0-liter turbo inline-6, the new 2.0-liter engine will combine high-pressure direct-injection and BMW’s VALVETRONIC intake control. With 240 horsepower and 260 lb-ft of torque, it offers more power and torque than BMW’s normally aspirated 3.0-liter inline-6 that it replaces in the Z4 sDrive30i.

The turbocharger is a twin-scroll system, a design already seen in other six-cylinder powerplants.

Average fuel consumption for the BMW Z4 sDrive28i in the EU test cycle has improved by an impressive 20 percent.

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