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