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Speedometer adjustment?

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    #16
    Originally posted by mr.vang View Post
    Some people consider 195/60/14 stock size and I have seen many with this size when it is suppose to be 195/65/14. Po mounted 195/60/14 on my basket weave and when my speedometer showed 80mph, I'm actually doing ~72mph.

    I'll double check my tire size. But when I know I'm doing 70 the speedometer reads 95

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      #17
      Originally posted by nando View Post
      the coding plug controls the tach and econogauge, it has absolutely nothing to do with the speedometer.
      You're right, of course. For whatever reason when I first read the original post I was thinking of the tach and not the speedo.

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        #18
        Was your speedometer ever swapped out? the speedo assembly must be matched to the correct speed sensor or you will be off. There is a calibration factor number printed on the face of the speedo and looks like this. k=xxxx with xxxx giving you a value.
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          #19
          There are only 1 type of toothed wheel sensors - 9 pulses/rev. it's true that some will have different K-factors calibrated in though. given how crummy the components are I wouldn't be surprised if the output of the calibration could jump to a different value due to aging components. The resistors on these boards are like +/- 25%, a modern 10% resistor will really be more like +/- 5%.
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