2012 BMW 640i Coupe Review
What we have in the 640i is a new combination of existing parts, but a combination that is in no way surprising. The BMW 6-series, freshly redesigned for 2012, shares most of its underpinnings with the 5- and 7-series sedans, both of which are available with a turbocharged inline-six. With ever-tighter fuel-economy standards looming, the 640i is as expected as someone ducking when you take a swing at his face.
The 640i represents the first regular-production increased-output application of the N55 single-turbo inline-six BMW introduced last year (a higher-output package also is available as an option on the 1- and 3-series). Making 315 hp and 330 lb-ft of torque, the 640’s engine betters other N55’s by 15 horses and 30 lb-ft. Down one hair drier on the twin-huffed N54 that preceded it, this six nonetheless is virtually lag-free. Maximum torque is available from 1400 rpm to 4500, allowing the engine to yank the car forward at any speed. The pull to the 7100-rpm redline is so satisfying you’ll have a hard time letting up on the accelerator. On the autobahn, heavy rain and traffic alternately kept us from reaching the car’s 130-mph top speed (a governor loosened to 155 is on the options sheet), but we easily cruised at triple digits when the road was dry. Zero-to-60-mph sprints should take 4.8 or so seconds