Are the new BMW using waste heat from exhaust gases and regenerative braking to deviate from the traditonal naturally aspirated engines?
2012 BMW 528i to Get Higher MPGs with New Turbo Four-Cylinder Engine
Continuing BMW’s trend of making the numerical badges on the back of its cars correlate less and less with what’s actually under the hood, the German automaker announced that for 2012 the 528i sedan is abandoning the well-known naturally aspirated 3.0-liter inline six-cylinder engine for a small-displacement turbocharged four-cylinder engine.Following the same move BMW made with the Z4 roadster and perhaps not surprising, the 2.0-liter direct-injected TwinPower turbocharged engine supplants the six-cylinder as the base engine for the 5 Series range. The new engine is expected to deliver 240 horsepower, just like the outgoing I-6, but is expected to bump torque up by 30 lb-ft to 260 available from just 1250 RPM. Paired with BMW’s eight-speed automatic, the automaker expects fuel economy to improve up to 15 percent from its current EPA-rated 22/32 mpg city/highway while hitting 60 mph in 6.2 seconds — 0.4 second quicker than the outgoing six-cylinder 528i. Also assisting in the 528i’s higher fuel economy will be regenerative braking, start-stop technology, and an Eco Pro mode that will adjust air conditioning and throttle mapping to optimize fuel economy. For the first time since 2010, the 528i will again be available with BMW’s xDrive all-wheel drive system. Newly updated, the 528i’s xDrive will be the first in BMW’s sedan lineup to feature individual rear braking for more neutral handling, hill descent control, and the ability to shift up to 80 percent of its torque to the rear wheels. The 2012 528i arrives at dealers this fall. Source: BMW
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