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Motorsports & Track Forum
From Auto-X to Trackday to Racing and Professional Motorsports this is the place to discuss making BMWs fast

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Old 04-22-2004, 10:24 PM   #1
Chewsyluvr
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My First Autocross

I was in the AST class instead of the B class because of the PSS9s and +2 tires. I finished 8th in class ahead of several M3s and M Roadsters.

4/4/04 Event Results
http://peachtreebmwcca.org/ax2004/Re...XXFAS_0404.pdf

Classifications
http://www.dlbracing.com/permanentnumbers/classes.aspx
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Old 04-22-2004, 11:05 PM   #2
malakia12
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congrats bro just one thing, I really hope you did not autocross with 18" chrome wheels!!!next time, use your stocks if you don't have anything else. just a thought
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Old 04-22-2004, 11:37 PM   #3
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Its really no problem autoXing on 18's. I do it all the time on my GT3's and they hold up just fine. Yes, you will be able to handle more efficient with 17" wheels with the same tire as on the 18", but 18" is still okay. Now 19" on the other hand is too much!
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Old 04-23-2004, 12:06 AM   #4
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Quote:
Originally Posted by IDLOOK2
Its really no problem autoXing on 18's. I do it all the time on my GT3's and they hold up just fine. Yes, you will be able to handle more efficient with 17" wheels with the same tire as on the 18", but 18" is still okay. Now 19" on the other hand is too much!
its not the size that I was really making a point about, but rather that it is 18" CHROME, which is probably pretty heavy.
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Old 04-24-2004, 03:44 AM   #5
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ic, good point
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Old 04-26-2004, 03:20 AM   #6
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Why are 17s better than 18s for the track? Other than a negligible circumference difference, wouldn't the 18s (at the same or lower rim and tire total weight) exceed the maximum performance of 17s? Me thinks so, with the lower profile providing additional grip.
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Old 04-26-2004, 09:04 PM   #7
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Well, first off, I am talking about non M e46 only. I am not completely sure who is right and who is wrong with this, but I would think (and have heard) that 17 is the ideal size for weight and side wall on tires allowing flex but not too much.

So, the disagreement is whether a lower profile with give more or less grip. Anyone care to share?

While were on the topic, does anyone know why all the vettes have 17" front wheels and 18" rear wheels? Is that just for looks or does it make a difference?
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Old 05-12-2004, 04:02 AM   #8
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I've heard the same thing about 17s being ideal for autocross.

I'd guess that the +1 rears dial in or dial out understeer. Elise has 'em to. I love the Elise but a $47K track car is ridiculous for me right now. I'm eyeing a 325is currently.

I can't wait to drive an Elise
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Old 05-12-2004, 10:29 PM   #9
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true, the elise will have 16s in front and 17s in the rear
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