So I got new tires on the 20s and im totally in alignment specs as i go there every 2 month to recheck and my front insides are still getting chopped up. I know its a ongoing problem but jesus i feel like its getting worse as the car gets older. Has anyone pin pointed the suspension issue? Maybe i can relace some bushing to tighten it up a little? Any thoughts?

 

There alignment specs have an entire degree of variability to be "within specs." So being within specs won't necessarily prevent accelerated inner tire wear.

On my sedan, I added camber kits front and rear to get the alignment as close to 0 degrees camber as possible. That may not be desirable for everyone, especially people that live in curvy, mountainous areas, but here in flat Florida, it's fine.

 

This is a very good point, something I do not see discussed much. The G35/350z in its stock ride height has a ton of negative camber. The factory specified rear camber range for a 2005-05 coupe is -.08 up to -1.8! This is more camber that many street tires are designed for!

It comes as no surprise to me how many complaints I see concerning tire wear, and road noise with G35/350z owners. Hell, I read somewhere that some owners were trying to file a class action lawsuit over these issues.

It is a shame that Nissan had to design this much negative camber into the suspension in order to make the car handle good. Before someone starts flaming me- ask yourself.... Have I ever seen a stock BMW or Porsche with -1.8 deg of negative camber?

 

You have too much toe out. Your alignment should have a little bit of toe out to make it close to 0 toe when you get in your car.