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Old 11-18-2009   #8
-=Jeff=-
 
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Join Date: Jul 2007
Location: Bartlett, IL
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Default Re: Coilover Spring rates

Quote:
Originally Posted by Aurora40 View Post
That's interesting. I wonder if something is missing from the equation. Presumably a coil spring of the same rate would be softer, because the coil is not straight up and down. So the spring compresses less than the suspension travel.

A stock '90 ZR-1 has a 96.2 N/mm spring, which is ~550 lbs/in.

The Z51 rate was 660 lbs/in.

The '92+ Z was 430 lbs/in.

So I'd think a 425 coil spring would be softer than the later cars. People who install coil-overs though do not seem to go to those sort of extreme rates in the 550+ range. Which is why it seems like the math must be more complex than that or something?
I don't know, but I remember talk of the calculations like this on CF.. about a year ago and I made note then that the 425 was my best choice for me to try..

I will see if I can find it again
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