Speed checks with a display along the side of the road are notoriously
inaccurate. Use a navigation system like TomTom or Garmin. On the
display you can read the exact speed you are travelling, they are very
accurate as long as you drive a constant speed.
You can have the speedo recalibrated using these readings or calculate
the gear you need in the transmission.
Kees Oudesluijs
NL
Bruce Griffin wrote:
> Gentlemen,
>
> This a very basic question, but I am hoping for some insight to see if there
> is a common Healey reason for this.
>
> I know my speedo has been bouncing, so I want to replace the cable to see if
> that helps. My main question is how to estimate my speed based on my
> obviously incorrect speedo reading. I checked my speed with another car and
> knew it was off. Today, I passed a PD temp. speed camera that displays your
> speed. It indicated I was going 40mph, while my speedo showed my speed at
> 55mph. If I remember my engineering training from college, this is related to
> the gear in the transmission and I should be able to adjust my speed by using
> the fraction 40/55. This assumes a portion for correction as opposed to a
> simple add 15mph because the gearing of the speedo drive gear is adjusted by a
> percentage, not a fixed number. Any advice appreciated.
>
> This is also a good math problem for my 11yo son.
>
> Regards,
> Bruce D. Griffin
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