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Old 11-18-2009   #7
Aurora40
 
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Join Date: May 2005
Location: Leesburg, VA
Posts: 2,704
Default Re: Coilover Spring rates

Quote:
Originally Posted by -=Jeff=- View Post
I did not want too hard or too soft, to mee it feels like 425 is harder then my OEM 90 spring..
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?
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