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Old 10-29-2005, 06:53 PM
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Camber angle on IRS rear ends

Hi,

I realize this is a loaded question, but as a general rule of thumb, what is the proper camber angle that an IRS suspension should be set up at?

I mean, the top of the tyre should be angled 'into' the car right? But, what angle should this be, 1 degree? 2? maybe more?

regards,
joe

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Old 10-29-2005, 07:07 PM
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irs camber

Most irs cars have 0 camber as the factory spec. If you want a little negative camber tell the guy when he does your alignment ( if yours is adjustable) to set it the most negative while still in specs. you should still get decent tire wear and a little better handleing. Imo 2 degrees is too much in neg camber. If you have z rated tires they will most likely wear out within 10-15k miles.
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Old 10-29-2005, 07:16 PM
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Cool! Thanks for the info. Yes, I am using rather sticky Kuhmo tyres. I'll certainly keep this in mind.

thanks,
joe
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Old 10-30-2005, 07:34 PM
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Excellent answer from the young man in Oxnard!

I would only add that another consideration is the camber control as the wheel goes into jounce. In other words, if the suspension geometry causes the outside tire's camber to go positive under hard cornering, it might be necessary to have considerable negative static camber for maximum cornering performance.

If your's is a street car, set the static camber at zero or, if you like, a degree negative. This will give you the best tire wear under normal driving. But, if you're a serious autocrosser, you will want to take temperature readings across the tire after some hard cornering, or, at the very least, have a buddy snap some pictures to catch the outside tire in a corner. Camber is then adjusted accordingly, with the understanding that cornering performance has top priority.
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Old 10-30-2005, 08:17 PM
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Thank you. I have been doing some reading and indeed, a zero to 1 degree negative would be the way to go. Thanks again!

regards,
joe
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Old 11-04-2005, 02:08 AM
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If you want to get serious, and reduce tyre wear on a daily basis, then measure your ride height,set the chassis on stands and remove the springs. Reset the ride height(if the car is 8 inches off the FLAT floor then set the ride height 8 inches up)
Jack the wheel/tyre through normal suspension travel and measure the camber change. If you modify the upper arm length or pivot point you can induce negative camber during compression whilst maintaining zero camber at static ride height.
Watch your toe changes also as some IRS cars (mid 90's Holdens and W210 M/Benz) wear the middle 30% of the rear tyre - Severe toe change during extention perhaps? Anyone else dealt with this?
If this is too much work on a daily driver, just set it at 0 deg, 30min neg and spend the bux for some Mich, Cont or Avon tyres.(we pay twice as much!)
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Old 11-05-2005, 12:18 AM
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Start with ! deg. and skidpad test to get the best handling.
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