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:

    Opening/closing the sliding visor
    You can move the sliding visor independently with the sunroof closed or tilted. ▷ Press the switch in the desired direction to the resistance point and hold it there. The sliding viso ...

    Notes
    Always make sure that safety belts are being worn by all occupants before driving away. Although airbags enhance safety by providing added protection, they are not a substitute for safety belts ...

    Brake assistant
    When you apply the brakes rapidly, this system automatically produces the maximum braking force boost. It thus helps to achieve the shortest possible braking distance during full braking. This ...