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Speedometer Error Or ??? (archive)
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Posted by xgmmgr on October 01, 2000 at 22:02:40:

Just completed a weekend run between IL and NY. I took a stop watch, and did both Speedo and Odo checks. Also repeated in 2 states, just in case the mile markers are different.
First I set the cruise on indicated 75, and with no interruptions, covered 20 miles in 17:02. That calculates to just over 70 actual mph. I also checked the Odo, and found that over 45 miles, the total error was only 0.3 miles fast.
My question is this; If BMW can electronically get the Odo correct(0.66%), why is the Speedo so far off(6.5%)??, unless the electronics are purposely calibrated to give such a great error.
For those into top speed runs, assuming linear error, the top speed limited at 128 would indicate 136 on the speedo.
Anyone with similar results??


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