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RE: Wider tires on the front!
Sent: Sunday,August 03,1997 9:11 AM
To: firstname.lastname@example.org; QUATTRO@coimbra.ans.net
Subject: Re: Wider tires on the front!
> 1. Radial tires tend to deflect (bulge) alot under weight. Actual
> rolling diameter of front and rear tires will be different when all
> tires are at the same pressure, as there is more weight on the fronts.
> (measure the height of the wheel center to the ground) I think there
> will be more than 1 % difference right there.
I agree with you in principal but who said anything about running equal air
pressures front and rear? I certainly don't on my quattros, especially for
> I think the centre diff is designed to handle moderate imbalances of
> front/rear rolling diameters, I wouldn't worry about wider tires up
> front, as long as the rolling diameters are close, like Mr. Goggin's
Obviously, I agree here as well... :^)
> I don't run my Q with the diffs locked unless I am driving on a
> surface that has some "give", ie gravel.
I always lock the center diff for autocrossing (but never the rear since it
causes way too much understeer) and don't think it's a problem. Of course,
the tires are usually generating a fairly large slip angle in corners so it
doesn't cause the drivetrain to bind up too much... :^)
/ l l o l \ l o Jeffrey Goggin
/__l l l / l l l l l l / l l AudiDudi@delphi.com
/ l l_l \_l l l__/ l_l \_l l http://people.delphi.com/AudiDudi
WHat size tires do you run and what type. Just curious about whether or not that is too much force on center diff. I know Ned locks up his center diff when he races. What is the handling difference between locked and unlocked on a dry, hard, pavement autocross track. Any funky behavior? I autocross a little but havent tried that. THanks.