5ktq speedometer error

[Ameer Antar]

Cool, I think I might try playing with the resistance on a spare that I have. I
might try playing with the resistance as in Tony's email. How hard is it to get
in there? Do I have to take the speedo out of the cluster?
 
-Ameer 


-------------------- Original Message --------------------
From: Kurt Deschler [desch at alum.wpi.edu]
To: Ameer Antar [antar at comcast.net]
Cc: quattro at audifans.com
Date: 4/29/07 9:09:49 PM
Subject: Re: 5ktq speedometer error

 > Ameer,
> I looked at the circuit and guage internals. The circuit is pretty simple.
> It converts a pulse from the sender to an analog voltage. There is
> no adjustment on the guage but this could be added easily on the analog
> side with a potentiometer. I suspect that there is a bad capacitor or D/A
> convertor that is making the guage pulse on mine. I have an extra board
> from the junkyard to swap parts from now. I will send an update when I get
> a chance to fix my guage.
>     -Kurt
>
>  It looks like a pretty simple
> pulse counter with a D/A converter and analog
>
>
> > Message: 1
> > Date: Sun, 29 Apr 2007 12:17:58 -0400 (EDT)
> > From: Ameer Antar [antar at comcast.net]
> > Subject: Re: 5ktq speedometer error
> > To: Quattro List [quattro at audifans.com]
> > Message-ID: [31940233.121177863478126.JavaMail.SYSTEM at jeves]
> > Content-Type: text/plain; charset="us-ascii"
> >
> > I know this is a really old topic, but I just noticed that even though the
> > speedo is 4-5mph over true speed, the trip computer does register pretty
close
> > to the correct speed. I cleared the average speed on the computer, and it
> > showed 76mph while the speedo showed about 80. So it looks like the offset
is
> > in the speedo only. I wonder how that affects the odometer mileage since
it's
> > part of the speedo. Does anyone know of a VDO gauge specialist? I wonder if
it
> > can be re-calibrated...
> >
> > -Ameer
> >
> > -------------------- Original Message --------------------
> >
> >> Message: 5
> >> Date: Thu, 25 Jan 2007 17:04:51 -0500 (EST)
> >> From: Kurt Deschler [desch at alum.wpi.edu]
> >> Subject: 5ktq speedometer error
> >> To: quattro at audifans.com
> >> Message-ID: [Pine.LNX.4.63.0701251701130.24874 at cs.wpi.edu]
> >> Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
> >>
> >>
> >> The speedo on my 5ktq is around 6mph on the high side. In addition, it
> >> pulses at low RPMs. My suspicion is a bad capacitor somewhere, but I
> >> really know how these speedos work. Anyone seen this before or have a fix?
> >>
> >>   -Kurt
> >>   87 5kcstq
> >>   89 200tq
> >>   00 s4
> >>   95 s6
> >>
> >>