<VV> GPS error> Tires & Speedometers

Rick Norris ricknorris at suddenlink.net
Wed Sep 23 18:42:31 EDT 2009


Get out that 5280 foot tape and make your own markers!
TLH

> Which is well within the error range of commercial GPS'.  Frank, you could
> drive several measured miles and compare your GPS to see how accurate it
> really is. Keep in mind the mile markers are not necessarily accurate as 
> one
> would like, so one needs to find a measured mile, etc.
> Chuck S
> ----- Original Message ----- 
> From: "FrankCB" <frankcb at aol.com>
> To: "Chris & Bill Strickland" <lechevrier at earthlink.net>;
> <virtualvairs at corvair.org>
> Sent: Wednesday, September 23, 2009 3:46 PM
> Subject: Re: <VV> Tires & Speedometers
>
>
>> Bill,
>>     Why not just hook up your GPS unit, drive the car on a straight road
>> at steady speed with little traffic and read the GPS speed?  My Garmin
>> 255W (thanks Jim) tells me my speedo is about 2 mph FAST at 65 mph.  So
>> it's a little optimistic, just like me.<GGGG>
>>     Frank "looking for easy way out" Burkhard
>>
>> In a message dated 09/23/09 15:35:54 Eastern Daylight Time,
>> lechevrier at earthlink.net writes:
>> [SNIP]*IF* it is important to you, you could probably do better by
>> figuring
>> out what tire circumference gives your particular speedometer head the
>> greatest accuracy, and/or by sending your speedo head out to a shop and
>> get it "Certified" (used to need the whole car to do this - $$$) or at
>> least calibrated, and/or by having a speedo shop build you up a  "ratio
>> adapter" to give you a correct speed  for your speedo and the tires and
>> gearing that you choose, rather than making tire size choices based on
>> someone else's idea of how your speedo should read and what your car
>> should look like.  Then when you put on your "winter tires" (for those
>> that drive year round), you just change the ratio adapter, too.
>>
>> There are many shops that provide these services -- just one example is
>> http://www.speedometerservice.com/services.php
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