Speedometer Adjustment for 5KTQ?
Swann, Benjamin R. (BSWANN)
BSWANN at arinc.com
Wed May 9 10:35:09 EDT 2001
I did some more checking archives and then checked my car.
1. Speedo reads about 10%faster than the computer speed eg. reads 50 at 45.
2. I looked at spare Instrument cluster. There is a resistor on the ic
directly behind the speedometer. 2 orange bands, one black no
tolerance=33ohm? Don't know what value is on the one in the car. I'm
thinking about putting a variable resistor that I can control without
pulling the ic out. Then once I find the correct value, I can put in a
fixed value. Is this the correct resistor or is there another one I should
Here is some clippage from the archives that may jog some memories:
[Tony Lum wrote:
> I remember the post but I can't find it. I do remember that the circuit
> uses a 54 ohm resistor and if you change it to 51 ohms the speedo gets
> nearly dead on. I was going to try this trick myself next time I had to
> pull the speedo cluster.
Hmm...yhea, I remember that too.
We have about 3 boxes lying around full of milspec-grade resistors and
other components and I'll check to see if I can find some 51 ohm milspec
resistors. If I do, you and other folks on the list are more than welcome
to 'em(I'll post if/when I find them, no "send me one" emails, please! :)
brett at pdikeman.ne.mediaone.net
Is there anyone else out there with the 10v motor that goes 90mph
>at 3000 rpm's ? 215/60/15's on the car.
>(4) How fast are you going at 3k rpm's in 5th gear on flat land?
>I have driven a 89.5 200 Q and at 3k rpm's I'm doing 80 mph and a
>friend on the list who has a '87 5ktq says he is doing 80 mph at 3k rpm's.
From: Pcarselle <pcarselle at worldnet.att.net>
I improved the accuracy of my speedo by replacing an aot resistor and
repositioning mechanical zero. It's now spot on at 30mph and 60mph.]
'87 5kcstqw - going 5-10mph slower than the speedo says.
From: Nate Stuart [mailto:nathan.stuart at maine.edu]
Sent: Tuesday, May 08, 2001 11:39 PM
To: Swann, Benjamin R. (BSWANN); quattro at audifans.com
Subject: Re: Speedometer Adjustment for 5KTQ?
There once was a fellow on the 200q20v list that found out what/where the
resistors were on the back of the IC to change the speedo calibration. A
search through the 200q20v archives might reveal something. I know they are
different IC's, but I'm sure the circuitry is close enough to at least point
you in the right direction. Don't see how changing that gear could affect
----- Original Message -----
From: "Swann, Benjamin R. (BSWANN)" <BSWANN at arinc.com>
To: <quattro at audifans.com>
Sent: Tuesday, May 08, 2001 5:10 PM
Subject: Speedometer Adjustment for 5KTQ?
> Is there anyway to adjust the speed reading of the speedometer. Mine
> to be reading a little fast after I replaced a gear(from spare unit) that
> had caused the Odometer to stop working.
> I did not see anything in the Bently.
> I will be doing some long cruises and comparing with mile markers and
> and would like to know if there is a way to adjust the speedometer so it
> dead on. I have the feeling it isn't even close right now.
> Or maybe I really have been cruising at 85-95 even though it feels like
> '87 5000cstqw - probably not going as fast as as speedo says.
> '85 4000csq - Sounds and feels like it is going faster than the speedo
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