[200q20v] Re: Speedo help

[Cordeiro, Alan]

Richard,

I don't see how it has anything to do with the final gear ratio.
Both the speedometer as well as the average speed counter use the
same hall effect sender that runs off the transmission. So the same
electrical pulses go to each "unit" that reads speed. There is
no other way to see "ground speed" unless someone can tap
into the pulses coming off the ABS wheel sensors. 

Alan

***********************************
Message: 2
Reply-To: <rberlin at feltonberlin.com>
From: "Richard E. Berlin, Jr." <rberlin at feltonberlin.com>
To: <200q20v at audifans.com>
Date: Tue, 15 May 2001 12:41:42 -0400
Subject: [200q20v] Speedo help.

 My last '91 Avant,(oem rims and 215/60 tires) always
measured 72mph when the rev counter  was at 3000 rpm's in
fifth gear. In addition, when I would reset the average
speed button on the computer, the initial reading always
corresponded to the reading on the analog speedo gauge.

The newer '91TQA  (identical rims and tires) measures 77mph
on the speedo gauge at 3000rpm's in 5th gear. But when I do
the average speed reset on the computer, it reads73mph--4
mph lower.

Could it be that Audi put 2 different rear ends in these
cars?? I remember reading an ongoing thread several months
ago where Chris Miller and another lister were contending
3.89 vs 4.11 ratios as OEM??

Would you guys run the 300rpm 5th gear test and let me know
what speedo and avg speed reset readings you get? In the
mean time, I'll hit the Mass Pike with a stop watch over
some measured miles.

Richard E. Berlin, Jr.
'91 200q20v Avant
Email: <rberlin at feltonberlin.com>
(978) 548-3737