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      06-27-2010, 03:11 PM   #18
jbh
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Drives: 2007 Z4M
Join Date: Aug 2009
Location: Fort Worth

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Holy understeer!!
I just got back from my first AutoX with my local PCA club. Car is totally stock with stock tires as well.

Next event I am putting on my 4 245/45 R18 2/3 used up star specs on my second set of M wheels and then try that out. I could definately tell the stock tires are not as sticky as the star specs. I really thought my braking sucked but I think it was just the low grip of the tires. I am probably going to go from understeer to oversteer but thats ok, I already own the tires so its not like its costing me anything to try it out. I then need to get some negative camber by pullin the pins and getting an alignment, maybe using the washer kit.

I did feel like the back end stuck pretty good coming out of corners with throttle. I guess the M differential is a good one.

If I had to guage it I would say I was 1.5 to 2 seconds slower on a 45 second course vs the 350Z with the square star specs setup. Hopefully the different tires will bring my times down.

Anyone else had a chance to try out any of their changes?
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