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  #1  
Old 05-31-2010, 04:45 PM
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Your Speedometer?

On your X5M, does the speedometer read 4 MPH faster than actual speed? Mine has and does. Got a ticket today for 88mph from an airplane!

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Old 05-31-2010, 05:12 PM
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I would be surprised if it was only 4 mph out. BMW designs speedometers to read optimistic by about 4% + a few mph, so that they will never be liable for a speedometer reading too low.

Edit: EC Regulation 39 (speedometer accuracy) states that a speedometer may never read low, and that the indicated speed must be no more than (true speed x 1.1) + 4 km/hr. Due to production tolerances, tire size variances, etc, manufacturers will use a portion of that tolerance to ensure they never read low. BMW speedometers have long been considered some of the least accurate out there, by design.
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Last edited by JCL; 05-31-2010 at 05:31 PM.
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Old 05-31-2010, 11:42 PM
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Got a 2011 X6M... Funny u mention this... I was passing one of those radar signs that tells u your going too fast and I actually though to myself that it seemed to be 4 mph lower than what my dash said.
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Old 06-01-2010, 11:56 AM
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No ///M but my 4.8 always reads 2mph faster than what radar signs and my gps linked detector says. Funny side note, I have been told lamborghinis read something like 10mph faster, which in turn runs the odometer up faster and leaves owners out of warranty 10% faster.
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Old 06-01-2010, 12:01 PM
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Mine is also 4mph fast. I figured this with both an airport radar sign and calculating a 10 mile run via the stopwatch.
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Old 06-01-2010, 08:09 PM
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Quote:
Originally Posted by CarsRmyVICE View Post
No ///M but my 4.8 always reads 2mph faster than what radar signs and my gps linked detector says. Funny side note, I have been told lamborghinis read something like 10mph faster, which in turn runs the odometer up faster and leaves owners out of warranty 10% faster.

The rules call for a % variation (on the high side) of the speedometer. Their is a built-in adjustment factor. Odometers read accurately.
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Old 06-02-2010, 10:10 PM
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The OBC shows the correct speed, which is there the odometer is calculated from. Since I've relocated my OBC to my glovebox, I use the the navi screen to show the exact speed I'm going. I just always go 5mph on the speedo, knowing I'm really only doing like 2-3 over.
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