boulderbobo

So I'm putting my car back together from the last project, and I noticed a 1" wear pattern on the inside of all 4 tires. It's pretty minor now, but guessing it will get bad quickly if I don't change something. Recently (my last diy) I installed PSS10s. I know that lowering the car changes the camber....but I did not lower the car that much. Maybe 1.25 - 1.5 inches. I had a 4 wheel alignment done at a pretty reputable shop.

Lots of you folks have lowered your cars way lower than mine. How do you guys keep your car from eating tires?


Since I need to get the car aligned again, are there any suggestions to mitigate this issue?



Bob-

flatsixforme

I'll let the experts chime in on the alignment settings but I think it's the nature of the beast to get inner tire wear (at least on the rear). Camber and toe will impact the tire wear the most. Too much toe-in really can eat things up.

One thing I do on my rears to maximize tire life is to swap the tires halfway through their life.

jungleboy

How many miles on this particular set?

boulderbobo

Probably <500 miles



Bob-

jungleboy

Any chance you have pics of the wear at all? If there is a lot of wear, that seems extreme for 500 miles. How aggressive was the camber set? Wear is expected, but how much is the question...

Ed Burdell

My tires did the same thing. My car has the ROW M030 w/Bilstein HD's.

I went back for a 2nd realignment, and my shop told me that while they were able to improve the alignment, they could not get it fully into spec, citing the lowered stance as the reason.

Can someone who knows for sure call BS on this? I find it strange that the car cannot be aligned to accommodate what is, after all, an official Porsche option.

boulderbobo

Thanks JB.

I can post a pic tonight.

I'll see if I can find the spec's on the alignment and post tonight.

I agree some where is expected. Mine seems excessive.



Bob-

jungleboy

Meanwhile, you should get out on some high speed twisties and even out that wear

pcar964

One thing I won't miss from the 993 was inside tire wear. Unbelievable how quickly you can go through a set of rears on a 993, even if properly aligned. Overly complex and finnicky rear suspension design, maybe someone will come out with a kit to backdate to the simple 964 design for the 993 cars

JM993

Respectfully disagree. I get 15K miles conistently out of my rears (my car is lowered). The key is a good alignment. One of the major improvements of the 993 is the rear suspension. Trailing arms are much less adept at keeping the rear of the car on the road - especially if it's wet or bumpy. That's why the trailing arm cars are set up to understeer much more the the 993. Oh, and the trailing arm suspension is noisier too.

Joe

95 C4 993

I had that issue a few years ago but since I had MO30's and HDs installed with an aligment, even wear on the tires---over the past 8000 miles.

My guesses are:

1. Bad Alignment
2. Good alignment gone bad---hit something, took a speed bump wrong, ect

I get about 8k out of my rear tires---thats consistent over the past 7 years and I dont know how many sets. 8k on rears, easily 16k on the fronts. 2 to 1 ratio is clock work with tires......for me that is.

AOW162435

13k out of my last set of Continental SportContact II tires...


Andreas

race911

Toe issue. I can post pics of the 22K+ set of rears from the C4S, albeit with 100% stock suspension and height, that I removed the first of the year. Still just worn over 50%.

Even with the PSS9/lowering, the set of 2/3 worn tires that came with the 996 hollow spokes show hardly any further wear with the 2-3K I've put on the car so far this year.

fast_freddy

Too much negative camber+too much toe=Insane tire wear especially on the inside edge. I went through a set of PS2's in less than 500 miles with a bad alignment which had way too much toe.

black ice

Like the others said - camber and toe. If you installed the shocks, lowered and reassembled without an alignment, you are way off. Especially in front. I did this.

fwiw, I was running pretty agressive camber in the past with minimal toe (about -2.3 deg in rear; stock is about -1.3 deg) and was getting about 8K out of a set of rears. I am at ROW sport height now and run basically stock camber and toe all around; get about 20K out of a set of rears. But I do quite a bit of highway miles.

I have had that problem where I can't get less camber - beyond ROW sport on the left side of my car only in the rear, I can't keep it at -1.3 deg.

dave