[patkeefe]

Yes, some of the tire wear is due to the negative rear camber which I evidently have in the rear suspension. One can look at my avatar and see how much body roll exists in this cab, which is why I have the poor man's solution of increased camber. I will have to get the camber back to whatever the factory said, as that car may never see the track again.



Boxster eats rear street tires at the rate of 3:1 versus front tires. 911 is surprisingly not as bad as the Boxster. My DOT-R track tires wear about the same F-R, and I have run those tires on both the Boxster and the 911

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[flash]

a lot of the camber change and rear roll in the cab is due to chassis flex. do you have the 3 braces in there?

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[patkeefe]

I think I have zero braces. I do have a cheap Autopower roll bar, but I don't count on that too much for stiffening.

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[Cloud9...68]

Does this imply that cabs (unbraced, anyway) would have more of a tendency to wear out their rear tires faster than coupes?

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[flash]

they will wear out all of their tires faster, assuming the driving is the same

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[patkeefe]

Update:

I put new Yokohama "S-Drive" tires on the rear, 275/40-17. The fronts were good. It fixed the ride a bit. The car is much quieter mow, but still somewhat skittish. I did notice yesterday that it does indeed have some of that drag racer F-R/R-F quick weight transfer, so maybe my shocks are worn some. This is really noticeable when at speed and throttle steering, very touchy and quick to understeer.

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[flash]

shocks won't make any real difference on squatting. they only slow down the spring. if they were shot enough to allow faster squatting, you would also have a very bouncy pogo ride. to reduce squatting you need stiffer torsion bars or additional spring.

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[patkeefe]

New Bilstein HD shocks in the rear have really helped with ride quality, and cut out a lot of the rattling noises. Next is to examine the front components and see what they look like, and to get the rear ride height down a bit. The car has about a 1" difference rear to front, which I guess is due to the bumper regulations at the time.

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