This is the only downside I can think of...

 

If you are cording the inside 1" or so of your tire as in your picture, then you have too much toe. Probably lowered with stock toe arms in the back.

 

How much toe is too much toe? I have a decent amount of toe but it is still well in spec ( 0.40° toe in). How much toe does it take to really kill the inside edge of the tread like in the above pic?

 

Actually I run this setup on purpose. Prefer corners to straights. :-). However with this last set I over ran the life of the tyres.

If you guys are running aggressive setups bear in mind that from the minimum indicators on the tyre to cord is only 250 hard miles. It goes very quickly indeed.

Now I know. So, when my inside thread (first grove) indicator gets flat with the tyre I change them.

 

Less toe and more Camber is more of a track set up, or turning set up....

More toe is more stability. That is kid with an RC car suspension 101

 

+1. Porsche specs their cars with a lot of toe for stability and straight line tracking for the avg Joe. Running less toe in the rear will reduce understeer by making the back end wanna come around more but under no circumstances would you want to run 0 or negative to in the rear as that would cause snap oversteer in our tail heavy cars. -1.5 to -2.0 rear camber combined with about half of the recommended factory toe spec will give you a very nice compromise of tire wear, stability, and street performance.

 

Thanks for the sharing the good info in this thread. You helped me resolve an irritating issue.

I'm a new 996TT owner (as of July). As part of making the car "mine", I installed new rear tires and, of course, I followed the factory recommendations for pressures at 36 psi front and 44 psi rear. Why would I question them? I figured the engineers' at Porsche had a good idea what they were doing.

The car just didn't feel right. Heavy understeer evident during side street driving. Twitchy steering and an unassuring looseness in the rear end at highway speeds, worse with an extended rear spoiler.

I've been troubleshooting this since the installation and driving myself crazy. Finally, I read this thread and adjusted my pressures downward. ENORMOUS improvement.

I still need an alignment (my PPI revealed it was marginal at purchase), but the car inspires a great deal more confidence now.

Thanks.