Quote:
Originally Posted by MRCUR
That's typical of every BMW I've ever driven.
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....and of speedometers in general
Quote:
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Most speedometers have tolerances of some ±10%, mainly due to variations in tire diameter. Sources of error due to tire diameter variations are wear, temperature, pressure, vehicle load, and nominal tire size. Vehicle manufacturers usually calibrate speedometers to read high by an amount equal to the average error, to ensure that their speedometers never indicate a lower speed than the actual speed of the vehicle, to ensure they are not liable for drivers violating speed limits.
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http://en.wikipedia.org/wiki/Speedometer#Error
I recall a lengthy discussion on this around 9 months ago in relation to the 'true top speed' of this car (it will display higher than it is actually going....)
will see if I can find it.
edit: yeah, here:
http://f80.bimmerpost.com/forums/sho...71&postcount=6
BMWs can display up to 10% + 2.4 mph over the actual speed
(the example being at 50 mph of actual speed, the display can be as high as 57.4 ((50 mph x 10%) + 2.4 mph)
(props to
M6-Coupe coupe for the post)