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#11
08-27-2012, 12:04 PM
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Reset the trip computer and the average speed display should now be your current actual speed. That was always 2-3mph lower than the speedo and seemed more accurate. Can't say that it's something I really worry about. I try not to exceed 10mph over the posted limit when I want to be law-abiding, and when I pass a cop I'm happy to know that I have a little bit of extra leeway from the optimistic speedometer. 
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#12
08-27-2012, 04:01 PM
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Quote:
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#13
08-28-2012, 10:25 AM
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I don't think there's a car in the world with an accurate speedo; they all overstate the actual speed, usually Japanese cars being the biggest cheaters for some reason.
However, iirc at least in VW cars it can be sort of corrected by changing some ratio/multiplier via coding.
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#14
08-29-2012, 07:00 AM
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Not sure what it's like in North America but in Australia all speedo readings are optimistic (compared to true road speed). This is simply a liability protection by manufacturers to ensure they don't get blamed for anyone caught speeding (or worse, involved in an accident). But I'm talking small numbers here (2-6 kph difference) ie. true road speed is slower than what's indicated in the speedo (or HUD). Plus the 20" staggered wheels have a smaller rolling diameter compared to the 18" or 19". The effect of this is to make the speedo read more optimistically that the true road speed.
__________________
H@mmer "Don't take life so seriously, it's not permanent" 
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#15
08-29-2012, 06:30 PM
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There are several remote radar sites that post your speed throughout Charlotte, including one in my neighborhood. I also verified with the Andriod app SpeedView. They all read 2-3 MPH below what my speedometer shows at any speed. Over the past 10 years, I have owned several GM vehicles and 2 Acuras and I have never noticed an MPH discrepancy. The speedo on my 2010 MDX seems to be exactly accurate from what I can tell. I also believe that manufacturers calibrate the speedo to reflect the factory wheel/tire package, so wheel/tire sizes should not affect speedo accuracy.
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#16
08-29-2012, 08:56 PM
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the speed factor can be programmed into the car, as noted in the post #13... the calibration factors for '06 4.8iS are given in the post #5. To obtain the calibration factors for any other specific bimmer, the programming of the odometer must be read... the police vehicles are usually calibrated to the T - so they can reasonably "clock" speedsters...
The digital speedometer is usually right on the spot, so on some newer cars, folks have programmed the digital speedo to be visible at all the times... On older bimmers that function must be invoked using the "test" sequences from the cluster... I wonder if anyone will take a chance and will reprogram their .MAN file to show the "correct" speed... I am too chicken to do so!!!! 
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#17
08-29-2012, 08:59 PM
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At a 100MPH, they've decided to arrest me. My "I wanted to check the speedo" excuse didn't work... 
__________________
2010 X5 35d Black - Full (current) 2012 X1 28i (retired, won't be missed) 2007 335i sedan (retired, and missed)
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#18
08-29-2012, 11:06 PM
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did they clock you? or was it radar? where was your V1?
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