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Speedo Testing?


willo

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  • Member For: 22y 2m 16d
  • Gender: Male
  • Location: South Coast NSW
Most speedos read under.  My GPS reads 92 when the speedo is at 100.

That is quite incorrect. MOST speedos read over, but usually by no more than 3%-4% if you are running the factory wheel. So when the speedo is showing 100 your true speed may be something like 96 or 97.

Even if you were to change wheels it would be a very rare occurence for a speedo to read under - you would have to use a very much larger wheel/tyre combo to have this outcome.

Did you read all of what I said or just the first bit? Maybe I should have said over, but I said that the GPS reads 92 when the speedo says 100, exactly the same as what you said. I agree on the wheels as the rolling diameter would have to change a fair bit.

Yes, I read all of what you said. But because what you said was contradictory I thought it should be corrected and then explained fully in case some others were lead into confusion. There are some REALLY OLD people on here you know ...

:tease::smilielol:

Anyhow, I trust it is all understood now ... :pinch:

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  • Lifetime Members
  • Member For: 22y 2m 16d
  • Gender: Male
  • Location: South Coast NSW
Has any one come across any problems with there Speedo on there BA, Got booked at 118km on cruise control on 100km??

What state did you get stopped in?

Secondly, my GPS reads precisely with my BF speedo. Although both are not highly accurate, they always read the same.

On a straight piece of road at a constant speed the GPS will be very accurate - if it's a good one then less than 1% error.

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  • Member For: 19y 2m

was pulled over in QLD, cunningham HWY.

I did not get re-calibrated by Ford since the rims were put on, I asked ford if it was necessary last service, they told me no which I thought was a bit strange.

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  • www.australianflag.org.au
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  • Member For: 19y 5m 9d
  • Gender: Male
  • Location: Brisbane

Mate find a way to get it tested, then you will know if it is worth contending in court. If you are anywhere close to Brissy let me know and I will put you on the radar gun and tell you if you like.

Scotty

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  • Member For: 18y 3m 22d
  • Gender: Male
  • Location: NSW
you weren't going downhill were you??? as it can speed up on its own going downhill??

If you were going downhill, in some states it isn't legal for the police to set speed traps on downhill runs.

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