[urq] Speedo Accuracy

[Brandon Rogers]

Yeah I read in QQ I think that there are _stiff_ penalties in Germany if 
speedos read low - so they are very conservative....

Brandon
----- Original Message ----- 
From: <Louis_Alain_Richard at computerhorizons.com>
To: "Pasqualoni, James E" <james.pasqualoni at gs.com>
Cc: "'Brandon Rogers'" <brogers at terrix.com>; <urq at audifans.com>
Sent: Thursday, June 16, 2005 10:21 AM
Subject: RE: [urq] Speedo Accuracy


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> Two comments about this:
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> The easy way to verify speedo accuracy is time divided by distance (yeah,
> right !).
> Here in Quebec, on the highway, there is a km marker at each 1/2 
> kilometer.
> So I use the cruise control to keep the car at 120 km/h, and measure the
> time to cover 2 kilometers. Then, the number of seconds I am off from 1
> minute is the speedo accuracy. Last time, just before the TSD rally, I was
> off about 150 meters (over) for each 5 kilometers, that is 3%. Car was
> riding 185/65R15 winter rubber.
>
> WRT to speed accuracy, Car and Driver had a paper about this a couple 
> years
> ago and the conclusion was : car manufacturers are always optimistic (for
> liability/legal reasons) and German cars were the worst, BMW being
> constantly 10% high. However, distance from the odometer was dead right. 
> So
> they _know_ how to be accurate, they just want you to slow down...
>
> Louis-Alain in rainy Montreal
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>             "Pasqualoni,
>             James E"
>             <james.pasqualoni                                          To
>             @gs.com>                  'Brandon Rogers'
>             Sent by:                  <brogers at terrix.com>, Urq List
>             urq-bounces at audif         <urq at audifans.com>
>             ans.com                                                    cc
>
>                                                                   Subject
>             2005-06-16 12:02          RE: [urq] Speedo Accuracy
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> 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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