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BMW Z4 Roadster
First turbo four model will arrive this fall

Earlier this year, we reported that BMW's normally aspirated inline-6 engines will be ushered out and replaced by a new family of turbocharged four-cylinder engines. BMW today confirmed that four-cylinder power would return to U.S.-bound BMWs after a 10+ year absence. 

The first model to get BMW's new 2.0-liter TwinPower Turbo four-cylinder engine will be the Z4 sDrive28i Roadster (say that five times fast). The engine develops 240 hp and 260 lb-ft of torque (30 percent more torque at 1,500 fewer RPMs than the naturally aspirated 3.0-liter inline-6).

BMW says that the new turbo four will be 20 percent more fuel efficient than the inline-6 when paired with the 8-speed automatic transmission. We're sure that there are fuel efficiency gains to be made with the 6-speed manual transmission as well, but it's likely nowhere near 20 percent (or else BMW would have mentioned it in the press release).

The Z4 sDrive28i Roadster will arrive in showrooms this fall, and the turbo four will likely filter down to other BMW models soon after.

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By UNCjigga on 4/18/2011 3:58:11 PM , Rating: 2
So wait...that 20% fuel-efficiency gain is a result of the 4-banger paired with an 8-speed transmission? Wouldn't it be more accurate to specify the net gains from using the new engine alone? I'm sure the I6 would benefit from an 8 speed transmission too.

RE: Misleading?
By ImEmmittSmith on 4/18/2011 4:37:20 PM , Rating: 2
I would love an 8 speed in my 550i. :0)

RE: Misleading?
By PlasmaBomb on 4/19/2011 6:43:09 AM , Rating: 2
Combined with stop-start the 8 speed auto transmission should provide an 11% saving compared to a 6 speed auto.

(The saving drops to 6% without the stop start)

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