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:
Active seat
Active seat
The seat cushion is actively varied by alternately
raising and lowering the right and left half of the
seat cushion. This reduces muscular tension
and fatigue to help prevent lowe ...
Signal tones
When approaching an object, an intermittent
tone is sounded that indicates the position of the
object. For example, if an object is detected to
the left rear of the vehicle, a signal tone sounds ...
System limits
Sudden tire damage
Sudden serious tire damage caused by
external influences cannot be indicated in advance.
A natural, even pressure loss in all four tires cannot
be detected. Therefore, check ...