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:

    Interior motion sensor
    For the sensor to function properly, the windows and glass sunroof/panoramic glass sunroof must be closed. ...

    All around the headliner
    All around the headliner 1 Emergency Request 2 Glass sunroof 3 Indicator lamp, front passenger airbag 4 Reading lamps 5 Interior lamps ...

    Active seat ventilation
    Switching on Press the button once for each ventilation level. The highest level is active when three LEDs are lit. Switching off Press the button longer. The LEDs go out. ...