[urq] Speedo Accuracy
Pasqualoni, James E
james.pasqualoni at gs.com
Thu Jun 16 12:10:06 EDT 2005
Funny you bring this up now, as I have been playing with this same issue on
our 3 VAG cars. Here's what I've found:
83 UrQ-15x8 R-8's - usually around 3 mph over actual, up to a max of approx
5 mph off
03 Passat 4M Stock 16x7 rims - about the same difference as the UrQ
05 S4 Stock 18x8 AVUS rims - Always runs 10% high.
For the UrQ, I had my wife follow me in her Passat, using her trip computer
to determine actual speed. While testing both the Passat and the S4, it is
easy to look between the trip computer speed and the speedometer speed to
see the diff. What a PITA-too much math...
Why do two stay a relatively static amount above actual and one a constant
percentage above? Good question...
HTH,
Jim
-----Original Message-----
From: urq-bounces at audifans.com [mailto:urq-bounces at audifans.com] On Behalf
Of Brandon Rogers
Sent: Thursday, June 16, 2005 12:04 PM
To: Urq List
Subject: [urq] Speedo Accuracy
Guys-
Data point here - I had the chance recently to drive by ( a couple times)
one of those neighborhood radar signs - you know - that tell you how fast
you are going - an appeal to your conscience..) anyway I kept the speedo
right at 30 and got a readout of 27 on the radar sign - a couple times.
This is with new (3000 miles?) Dunlop SP 8000 225/50 15 on 8 x 15's. Now if
I can just remember to keep the speedo at about 82 when I want to go 75.
I'm assuming it won't always be 3 off - but it will be about 6 off at 60 and
so on...anyone know different?
FWIW my A4 was right on.
Brandon
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