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      02-19-2012, 12:42 AM   #32
STALKER
Brigadier General
 
Drives: 2008 E90 M3
Join Date: Feb 2009
Location: Toronto, ON

Posts: 3,651
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Quote:
Originally Posted by LateBraking View Post
Hated them when I was on wrong spring rates, The R's Tuning has been helping me out with test and tune. Now that I'm running softer rates in the rear, I'm happy. Shocks are excellent.

With the same shocks, I've run 650 front 900 rear, which was terrible on the track I run most often. I reduced the rear rate to 800 and it was much better. I'm currently on 650 front Hyperco springs, but I just ordered some Eibach springs from Ground Control this Friday, which will bring my front down to 550.

In the end, I think spring rates, like alignment, depend very, very heavily on driver preference. I know someone running like 400ish front and like 500 or 600ish rear on JRZ's and Motons? And then I know someone running like 800ish and 1100ish on Motons. Then I drove 500ish/800 on someone else's car and I was pretty happy with it, front was a tiny bit pudgy though. I wouldn't rely on my spring setup, and I certainly wouldn't rely on other forum member's advice. Short of getting multiple springs and trying different rates out, I'd take the time to speak to someone knowledgeable like R's or PF or Ground Control or PSI, etc.
My JRZ RS1s are here, and it was a challenge deciding on spring rates, even with James@Bimmerworld helping me out.
In the end we went with 500/800. I was running KW CS, and it seemed 500/800 was not a bad combo for dual purpose car, found it rough for daily use though. Expecting the JRZ shock when set up right should handle the spring rate for everyday use with no issues.

You find your car neutral??
What size RS-3s you running?
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2008 AW/FR E90 M3-SOLD
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