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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Dec-03-2010, 05:23:26 PM   #1
BluePiranha
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Default Autox Setup - Need to choose: More tire width or More camber?

I am running in a local Autox league and have a choice to make as far as modifications go. Different mods add points to the class my car is placed in. The car is a daily driver and will likely have the following mods on it:

AST coilers 550F/650R spring rates
Camber plates
9.5" rims all around

In addition to above mods, I basically need to make a tire size choice. Going with a taller tire that is narrower will allow me to use the left over points to run more front camber. Going with a shorter tire but wider will force me to run less front camber.


1) 255/40/18 tires - square setup - with up to -2.77 degrees front camber.
2) 265/35/18 tires - square setup - with up to -1.87 degrees front camber.

Is -1.87 Front camber enough for e46 M3? Which setup would you choose?
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Old Sun, Dec-05-2010, 10:18:01 PM   #2
Zapco
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Taller or shorter tires are really not a concern for determining camber set up. I think you need to decide exactly what rim/tire combo you are going to buy before proceeding.

To answer your question with the right rim offset choice many people on the forum are running 275/285 square set ups with -2.5 to -3.5 camber.

Once you get the coilovers, camber plates, rims, and tires you may need to adjust with different size spacers in front to dial in desired camber to avoid rubbing the outer tire on the fender.

You may also need to save money for "rear adjustable camber arms" to dial in the rear camber to avoid rubbing in the rear. Hope this helps.
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Old Mon, Dec-06-2010, 01:18:32 AM   #3
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The camber, without question.
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Old Mon, Dec-06-2010, 01:19:40 AM   #4
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Quote:
Originally Posted by Zapco View Post
Taller or shorter tires are really not a concern for determining camber set up.
Did you even read his question?
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Old Mon, Dec-06-2010, 01:58:25 AM   #5
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Go with more camber for tight courses. If you have a wider tire and too little camber, then you won't be evenly wearing the tire.
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Old Mon, Dec-06-2010, 02:01:29 AM   #6
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Why does having more chamber help out for tracking n such ?
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Old Mon, Dec-06-2010, 02:14:33 AM   #7
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Thanks for your answers. I can only use tires up to 265 mainly because I want to stay in the current autox C class. If I used wider tires than the ones I listed then I would be placed in a higher points B class. Sounds like going being able to use more camber on a narrower tire allow me to get more grip on a tight course than a wider tire with less camber.
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Old Mon, Dec-06-2010, 03:21:07 AM   #8
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Quote:
Originally Posted by prematureapex View Post
Did you even read his question?
Did you even read my response? At least I attempted to answer his question. Did you?
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Old Mon, Dec-06-2010, 06:27:50 AM   #9
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You won't get much, if any gain by running a 265 over a 255. Besides, camber will go a lot further performance wise.
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Old Mon, Dec-06-2010, 02:14:14 PM   #10
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Quote:
Originally Posted by Zapco View Post
Did you even read my response? At least I attempted to answer his question. Did you?
I did, he asked which one was more advantageous: more camber or 10mm more tire.

You completely missed his question. Read the first sentence you wrote. "Tire height and camber decisions are not related." You're right, normally they're not, but in his case, they are. He can only have one or another.

You didn't even come close to answering his question. You told him he needs to pick his wheel and tire setup first. That's the whole freaking point!

He's on a points system. He can either run a wider tire, OR run more camber.

Your post completely ignored all of that, and listed the popular tire sizes of people not limited by his rules.

You recommended he run BOTH the wider tires AND the increased camber.

Again, did you even read his post?

Hint: He was looking for an answer of a. wider tires or b. more camber.

Does your response even remotely resemble one of those choices?
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Discussing Autox Setup - Need to choose: More tire width or More camber? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)