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wrong speed displaed on speedometer GTZ 1992

Posted: Thu Mar 01, 2018 5:25 am
by ranausaurus
Hi all, I bought a GTZ 1992 1 month ago and there is a huge difference between the real vehicle speed and the displayed.
when I made 120kph real by GPS it showed 135-140kph but the computer is the good one, the cluster gauge, tire size, transmission too.
can it be the VSS ?


thank you ;)

Re: wrong speed displaed on speedometer GTZ 1992

Posted: Thu Mar 01, 2018 12:21 pm
by themixer
more than likely the cluster itself, using a obd 1 scan tool you would be able to see the VSS speed

Re: wrong speed displaed on speedometer GTZ 1992

Posted: Fri Mar 02, 2018 6:53 am
by ranausaurus
ah ok I will see it, thank you

Re: wrong speed displaed on speedometer GTZ 1992

Posted: Sat Mar 03, 2018 6:50 pm
by Bapsu
20kph difference between wheels and gauge is quite normal... just get used to it. :)

Re: wrong speed displaed on speedometer GTZ 1992

Posted: Sun Mar 04, 2018 11:38 am
by woody90gtz
You can adjust it in the tune if needed.

Re: wrong speed displaed on speedometer GTZ 1992

Posted: Mon Mar 05, 2018 3:03 am
by ranausaurus
I'm planning to get parts from moates to adjust the road speed constant ;) but 13-15% of difference in stock, is quite high.

Re: wrong speed displaed on speedometer GTZ 1992

Posted: Wed Apr 11, 2018 6:31 am
by 3X00-Modified
Is it a constant % off? If so then it could be just the needle has moved and isn't pointing to real zero.

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Re: wrong speed displaed on speedometer GTZ 1992

Posted: Wed Apr 11, 2018 5:43 pm
by Rettax3
3X00-Modified wrote:Is it a constant % off? If so then it could be just the needle has moved and isn't pointing to real zero.
???
If it is a constant %, that is a ratio problem -reluctor-ring tooth count, mismatched gauge, ECM, something like that. A constant kph off would be a misaligned needle...
Moates is likely the best route to go to fix it. Although a Dakota Digital SGI-5 (I think they are up to a -5E now, I've used the -5C models before) lets you reprogram the VSS ratio (and even signal types, like sine-wave to square or vice-versa) and is a reliable, quality part. Usually costs around $50 U.S.

Re: wrong speed displaed on speedometer GTZ 1992

Posted: Thu Apr 12, 2018 11:06 am
by 3X00-Modified
That's what I meant, a constant amount, not %... I don't know why I put that in there.