[V8] Goodyear Tires

[ur32vquattro]

"With the center diff locked, the drivetrain would have to explode in short
order. There has to be somewhere for all that stress to go.
My experiences with more traditional 4WD trucks and Jeeps says that the
drivetrain binds up quick if there is any difference at all from front to 
back."

I disagree. with the center diff locked via torsen or vaccumm, All it does 
is desrtibute front to rear. The front diff is always open period. This is 
what allows your front wheels to turn without binding. So you could use two 
differant size tires int the front whithout hurting the diff. The rear is a 
differant story.  Also, lets not forget that the 4x4 trucks you speak of 
have a locking front diff, so yes, they would explode with the tremendes 
stress
----- Original Message ----- 
From: <dsaad at icehouse.net>
To: <v8 at audifans.com>
Sent: Wednesday, October 26, 2005 6:28 PM
Subject: Re: [V8] Goodyear Tires


>I don't see how that could have lived very long at all.
> What kind of center diff did it have?
> If it was a torsen, it would have been trying to lock all the time 
> wouldn't it?
> If you had a electronic lockup, and it NEVER locked, it might work for a 
> while
> but I again would have guessed that the center diff eat itself up quickly.
> The stresses on CV joints and the whole drivetrain would be tremendous.
>
> With the center diff locked, the drivetrain would have to explode in short
> order. There has to be somewhere for all that stress to go.
> My experiences with more traditional 4WD trucks and Jeeps says that the
> drivetrain binds up quick if there is any difference at all from front to 
> back.
>
> Dave
>
>
> Quoting "Buchholz, Steven" <Steven.Buchholz at kla-tencor.com>:
>
>> .. 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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>
>
>
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