<VV> Discrepancies with main odo vs trip odo

[Joe West]

The gears that "turn" the numbers are physically different.  I suspect this
is a simple matter of different wear rates on the gears themselves.  The
fact that the error is a consistent percentage supports this idea.

Joe West


On 8/8/05 5:40 AM, "Rick Loving" <ral1963 at comcast.net> wrote:

> My 66 Turbo started its life as a 66 Monza and currently has the parts
> from a 65 Corsa (engine/trans 180/4speed with 3:89 diff)
>  
> The car currently has 215/60R15 tires which are around 25.14 inches in
> diameter, I had my wife pace me and 60 mph in out minivan equals 60 mph
> on the vair speedo.
>  
> The car has a Corsa dash with the trip odometer as well as the main
> odometer, but they don't seem to match up.  I have been tracking mileage
> and noticed that the numbers on my main odometer don't equal the miles
> totaled on the trip odometer when I compare them.  I thought it might be
> my math from start so I just used the most recent numbers.the trip
> odometer is reset at every fill-up...
>  
> Odometer reading 
> Main     Trip
> Start     end
> 5974
> 6108     144
> 6230     130.2
> 6277     50.8
> 6434     168.4
>  
> If you use the main odo and subtract the previous mileage you come up
> with
>  
> 134 instead of 144
> 122 instead of 130.2
> 47  instead of 50.8
> 157 instead of 168.4
>  
> The trip odometer is reading about 7% higher for every mile driven,
> when I watch the main and trip odometers the main appears to change
> different on every rev of the trip.
>  
> Anyone have any idea's why these don't equal each other and which should
> I trust when calculating my mileage?
>  
> I am perplexed as to why they would be different.as I thought they would
> both read from the same source.
>  
> Rick Loving
>  
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