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YOUR RESEARCHCan you align the rear tires?
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If you bought the car used there may be no way to tell without examining the componets since the previous owner may have installed an upgrade.
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Looks like my rear tires are balding on the inside closest to the engine on both tires. There's a difference of 4/32 from the inner part of the tire to the outter. Seems like an alignment issue. Can the rear rims/tires be aligned or are they fixed? Is the wear due to the weight of the engine? This is my first rear engine vehicle......
Yes.
There is not a great of Toe adjustment but it can usually be adjusted to within specs. Camber on the rear is normally done also. There is no caster adjustment on the rear.
There are specs for the standard suspension and they will be different if you have M030 US Sport suspension or ROW030 Sport suspension... AND they also are different on C4.
Do the front also and make sure they measure front toe out with the wheels turned as well as straight ahead.
A good alignment shop should be able to do this. Make sure they have a John Bean Visualiner 3D Computer Assisted Wheel Alignment Machine (and know how to use it
).
Loren (99 996)
Negitive camber is a good thing. Most people go the shop (like I did) to get a little more. Yes the tires do wear a little bit more but you gain better handling. Of course you can go overboard but just look a couple race cars you can see they got some pretty wicked neg. camber going on.
JD <img src="graemlins/beerchug.gif" border="0" alt="[cheers]" />
If the you look at the sticker under the front hood there are a list of option numbers. Since this is a US car if it was ordered from the factory with the US M030 Sport Suspension the you will find an option that reads "030".
If you bought the car used there may be no way to tell without examining the componets since the previous owner may have installed an upgrade. A stock suspension (with 18" wheels and stock diameter tires) should be about 26 1/2" ground to top of wheel arch in front and about 26" in the rear. If it is less (usually about 3/4 inch) in the front it has been lowered... perhaps by a factory kit or by an aftermarket kit.
Again, a good alignment shop that is familar with Porsches should be able to tell you. Sorry, I know a couple of good ones in California but not Illinois... and that's a long drive
Loren (99 996)
You probably have too much rear camber. If you decrease it you will get better tire wear and DECREASE the amount of understeer since the back end will stick a bit less.
Greg
