I'm getting ready to cut my front springs, hoping to get about a 2" drop in ride height along with a stiffer front spring:
Front springs: 8 coils, 4.0 diameter, 0.515 diameter wire, 13.5 inches long
Spring rate = (Gd^4)/(8ND^3) = (11.25 x 10^6 x 0.515^4) / (8 x 8 x 4.0^3)
= 193 lbs
Assume the car weighs 2500 lbs, 50:50 weight distribution; each wheel then carries 2500/4 = 625 lbs.
625 / 193 = 3.238, so the compressed height of the spring is 13.5 – 3.238 = 10.26 inches; this results in a ride height (at the front cross member under the
oil cooler) of 7 inches.
Cut 1.5 coils from the spring…
Spring rate is now 238 lbs., 625/238 = 2.63”, new compressed height is 8.34 inches … which should result in a new ride height of 5.08 inches … right where I want it.
1.5 coils is also the amount (if I remember correctly) that CRL says to cut from the stock springs.
Sound right?
THANKS!