Speedo reading low?!?

[Lyle]

And it's really easy to compute the %age error if you keep the speedo right
on 100mph for exactly a half-hour.


-----Original Message-----
From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
Behalf Of Doug Yoder
Sent: Tuesday, July 19, 2005 2:04 PM
To: Michael McLaughlin
Cc: quattro at audifans.com
Subject: Re: Speedo reading low?!?


Michael McLaughlin wrote:
> Next time I
> come across a speedometer check area on the freeway I'm going to time 
> it.

Those things are at least as inaccurate as your speedo.  Get a passenger
with a stopwatch, set cruise on the freeway, and time the mile markers.
Take several (10+) measurements, and average them to account for stopwatch
error and signpost installer error.  At least measure when cruising at your
normal speed.  Preferably, take several passes at different speeds (45, 55,
65, 75?), as your speedo may be 5mph off at one speed, but only 3mph off at
another (usually it is a % error).