if it were always 5mph over what u were actually doing, would you be really
going backwards when the speedo reads 0 mph??
this is rediculous. it has to do with the circumfrence of the stock tires.
and the difference between thatr and the tires u got on now
calculate the circumfrence(c=6.283Xradius) of the stock tirez then the
circumfrence now. divide the ones now by the stock. that will give you a
ratio. if it is 1.1 then when your speedo says 30, you r doing 33.
if it is 1.2 then you r doing 20% more than the speedo reading.
if the ratio is .9 then you r doing 10% below what the speedometer is
telling you. and so on
-Mark ChE student
----------
> From: Michael Clark <mike@snakebite.com>
> To: Dakota Mailing List <dakota@ait.fredonia.edu>
> Subject: speedo calibration
> Date: Friday, February 14, 1997 5:34 AM
>
> Just a quick question. If the tire diameter increases or decreases over
> stock, what happens to the speedometer readings. I thought that as
> vehicle speed increased the speedometer difference would increase also.
> Like real speed is 30, speedo says 33 then real speed is 70, speedo says
> 76. Does this sound right or does the difference remain the same
> regardless of what speed your going, like reading 5mph more than the
> real speed?
>
> The reason I ask is that my Dak reads 5mph more than the real speed.
> Checked it with a police radar that had been calibrated that same day.
> It was a while back, but if I remember correctly, from 30 up to 75 the
> radar was always exactly 5 less than my speedo. Didn't check any higher
> than 75 and I forgot what it did less than 30.
>
> Any ideas? My Dak has 255/60's which were installed at the factory (Mk
> III) Could the tires cause the difference?
>
>
>
> Oh yeah, it was a hand held radar I used. This was a lot of fun with
> radar detectors. Remote control tailights...
> --
> -
> Michael Clark mike@snakebite.com
> 93, LE, 2wd, reg. cab, SWB
> 5.2, Auto, Mk III
> MP SBEC, K&N FIPK
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