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2000 Boxster 2.7 Poor Front End Alignment


Vehicle Information: Year: 2000; Engine (type, size, modifications): 2.7; Total Mileage: 76000; Transmission: Manual;

I purchased my car with 28000 miles and it has never been wrecked, It has 18 inch wheels with 35's (rear), 40's (front). When I bought the car it had brand new Kumho Ecsta Supra tires that have the rain groove in the center. Although I did get 20K out of the tires the edges in/out became stepped/cupped to the point I could not stand the road noise and the inside of the rears were worn 2-1 to the outside.Thinking that the cause was the alignment, I put another set of the Kumho's on and purchased a lifetime alignment to make sure this did not happen again. 1 month/500mi later I took it in for alignment because the outsides started the same step/cupping. They use a brand new Hunter machine with a print out. I go in about once a month and the usual condition on average for the front is Toe(from -0.19 to 0.27, but usuall around +-0.08), total Toe (from 0.41 to -0.38), caster and camber is usually fine. On the rear caster and camber are usually fine and Toe is not as bad as the front(+- 0.08) usually only out on drivers rear. Thrust is always good.What could be causing this same wear from front to rear? And I know the rear has a lot of neg. camber, but is the accelerated inside wear normal? I usually don't take curves hard or drive too hard since this has reoccured. Could it be the non N rated tires cant stand the neg. camber? The road condition I drive on from 1-10, 10 being bad is about a 6.5. Why will my car not hold an alignment?Thanks

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