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:

    All around the center console
    All around the center console 1. Headliner 2. Control Display 3. Hazard warning system Central locking system 4. Opening glove compartment 5. Automatic climate control with 2-zone contr ...

    Start/Stop button
    Start/Stop button Pressing the Start/Stop button switches the ignition on or off and starts the engine. The engine starts if the brake pedal is pressed when you press the Start/Stop button. ...

    Switching on/off
    Press the button. On: the LED lights up. Off: the LED goes out. The system can issue warnings at speeds above approx. 40 mph/65 km/h. The state is stored for the remote control currentl ...