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Re: Speedometer vs. OBC avg MPH (archive)

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Posted by straight up on August 13, 2001 at 22:33:08:

In Reply to: Speedometer vs. OBC avg MPH posted by Keith '88 750il on August 11, 2001 at 23:01:56:

Has anyone performed an "instantaneous" reading from the OBC for MPH. I do this by going hitting the AVG MPH button and the hitting the S/R button. I assume that the first reading that is given is an "instantaneous" reading.

Using this method at about 60 MPH, my OBC is about 7MPH different than my speedometer. I believe that the OBC is correct.

Does anyone have any experience with this? Is there a way to adjust or calibrate the speedometer?

Yeah, mine too is out a little bit. 1988 750iL UK import now in Australia. OBC is dead accurate - have tested and proven that without doubt.
Also I was told by a very reliable source that (in Australia at least) speedometer is not allowed to be 100% accurate. Must have up to 10% decrease in speed reading from actual velocity.
Brian P.

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