[V8] Goodyear Tires

[Kneale Brownson]

Here's what Mr. Bentley for the '91 200q20v has to say on Quattro with
Torsen and Tires:  All four wheels on the vehicle must always have tires of
the same size, construction and tread type.  Different tires on the front
or rear wheels may impair vehicle control and will damage the Torsen center
differential because of the constantly different wheel speeds.  

I think I ran across a similar statement in the V8 manual's section on
owner information.

At 12:22 PM 10/26/2005 -0700, Buchholz, Steven wrote:
>.. do you have any data that demonstrates what sort of increased stress
>is created on a drivetrain that has tires of different diameter?  I'm
>sorry, but it does bother me to see this sort of statement without any
>data to substantiate it.  
>
>Here is my data point ... I owned a 1987 5000 TQ which had the proper
>rear diff but the transmission from a non-turbo ... i.e. a final drive
>ratio of 4.11:1 in front and 3.89:1 in back.  I don't know how long it
>was in that configuration, but I do not expect that even this magnitude
>of a transgression did anything to the overall longevity of the
>drivetrain ... 
>
>The only things that I can think of to bear in mind ... the ABS system
>does tend to expect all four wheels rotating at the same speed ... I'd
>imagine that on the V8 the transmission controller might want to lock
>the center diff on an automatic when enough variation is seen ... that
>and the Torsen diff will tend to shift power away from the larger
>diameter wheel.
>
>Steve B
>San Jose, CA (USA)
>> 
>> My understanding is that tires need to have the same circumference in
>4
>> wheel drive applications.  Changing circumference changes the final
>drive
>> gear ratio. Tires should be *very* close to avoid strain on the
>drivetrain.
>
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