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:

    Multi-channel playback, surround
    Choose between stereo and multi-channel playback, surround. Setting multi-channel playback, surround 1. "CD/Multimedia", "Radio" or "Settings" 2. "Tone" ...

    Automatic deactivation of the front passenger airbags
    The system determines whether the front passenger seat is occupied by measuring the resistance of the human body. The front, knee, and side airbag on the front passenger side are activated or d ...

    Roof-mounted luggage rack
    Note Roof racks are available as special accessories. Attachment Follow the installation instructions of the roof rack. Roof drip rail with flaps The anchorage points are located in the roof ...