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Old 12-07-2011, 11:02 AM   #8
blue2000s
Porscheectomy
 
Join Date: Mar 2006
Location: Seattle Area
Posts: 3,011
Quote:
Originally Posted by thstone View Post
This is easy. Ask your alignment shop to set the camber as close to zero as possible. The shop will likely say that this is not within Porsche spec. Tell the shop that you understand that this is not within spec but that you want it set up this way. This will "stand up" the tire on the street and give you more even tire wear across the tire in day-to-day driving.

The downside is now when cornering hard, most of the cornering force will be placed onto the outside 1/3 of the tire rather than onto the center of the tire. This will reduce your cornering grip but won't otherwise affect the handling or ride - turn in will still be responsive, you just won't be able to corner as hard as with the stock alignment setup.

For anyone tracking their car, they want to do the exact opposite and set up the alignment with as much negative camber as possible. This will place the force on the inside of the tire during street driving but will keep the force on the center of the tire when cornering extrememly hard on the track. It is also important to set air pressures in conjuction to the alignment on the track to keep force on the center of the tire and not on the outisde 1/3 of the tire.

If you track a lot and get pretty good, you may find that you are still running more on the outside portion of the tire despite having max negative camber and proper tire pressures. The next step at this point is to either lower the car which will alter the suspension geometry in a way that increases the negative camber or install adjustable (GT-3) control arms which allow additional camber adjustment than the stock solid control arms.
There will be an added tendancy to snap oversteer.
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