Speedo tweaking

[Cody Forbes]

Actually I did swap wheel sets a short time ago (right after the Ohio trip) 
because the set that belongs on the white car needs tires. Both sets are OE 
5ktq wheels, with either OE or maybe one size off sized tires. No change, or 
at least no discernable change, when wheels were swapped. Plus if wheel 
sizes were the issue the average speed counter in the trip display would 
still match the reading on the speedo. I don't recall the exact size on


Al I know what you mean about running the speedo 5mph fast, but heres 
something I wasn't very clear on. The speedo is reading 10% faster then the 
trip display, AND going by those roadside "Slow the F down" radar speed 
displays the trip is a few MPH/% fast. So not only is the speedo reading 10% 
faster then the trip, it's maybe 15% faster then road speed. At 70mph real 
speed the speedo shows maybe 83. That much is rather annoying. My heart 
almost stopped a few times when I was in FL last week just hanging with 
traffic and I look down to see the speedo indicating over 110mph, when of 
course traffic was doing maybe 95.


-Cody Forbes
http://www.5000tq.com
'87 5ktq - Fast.
'87 5ktq QLCC'd plus some
'86 5ktqCD
'86 5k
'86 5k


Mark J. Besso wrote:
> Does the white car have the OE-sized tires or have they got a
> slightly lower profile?
>
> Also, tires from different manufacturers aren't consistent.  A Dunlop
> may be slightly taller than a B.F.Goodrich, for instance.
>
> Try swapping tires from your black car and measuring the accuracy
> again.
>
> ~Mark
>
>
>
> -----Original Message-----
> From: Cody Forbes
> Subject: Speedo tweaking
>
> Anybody have experiance calibrating thier electric speedo (5ktq
> specifically, but I bet most are simmilar enough)? My white '87 5ktq
> is reading about 10% fast when compared to the average speed display
> (reset then see what the first valve displayed is and compare to
> current speed). I don't want to end up pulling the cluster 10 times
> while randomly screwing with the DIP switches, so hopefully somebody
> out there knows the configuration.
>
> TIA,
> -Cody Forbes
> http://www.5000tq.com
> '87 5ktq - Fast.
> '87 5ktq QLCC'd plus some
> '86 5ktqCD
> '86 5k
> '86 5k
>
>
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