Under the Hood

The 640i is powered by a 315-horsepower, turbocharged 3.0-liter six-cylinder engine. Its peak torque rating is 332 pounds-feet. BMW cites a zero to 60 mph time of 5.5 seconds for both the coupe and convertible. The standard eight-speed automatic transmission includes steering-wheel-mounted shift paddles.

Other standard features include computer-controlled adaptive shock absorbers and Driving Dynamics Control, which allows the driver to adjust the ride quality, accelerator response, power-steering assist level and automatic transmission behavior.

Optional mechanical upgrades include active stabilizer bars and active steering, the latter of which adds rear-wheel steering to the earlier generation's variable-ratio front steering system.

    See also:

    Seat and mirror memory
    You can store and call up two different combinations of driver's seat and exterior mirror positions. Settings for the backrest width and lumbar support are not stored in memory. Storing 1.&nb ...

    Turn signal, high beams, headlamp flasher
    Turn signal Using turn signals Press the lever beyond the resistance point. To switch off manually, press the lever to the resistance point. Unusually rapid flashing of the indicator lamp indi ...

    Switching on automatically
    Select transmission position R with the engine running. The images from Top View and PDC are displayed when the system has been switched on using iDrive. ...