CadVetteStang Posted May 26, 2014 Author Report Share Posted May 26, 2014 (edited) It's a good thing I scored some super beefy springs. I got a more exact measure of my rear spring motion ratio; distance from inner arm pivot point to spring center is 7 inches. Distance from inner pivot to center of outer bolt hole is 14.25 inches. I had originally thought that the spring was exactly half the distance which would have been a .25 ratio. But 14.25 divided by 7 squared is .2413... So, if I wanted a 200 lb. Wheel Rate like the stock Cobra, I would need an 829 lb. spring. But let's say I wanted a 225 lb wheel rate... 225 divided by .2143 is 1,049.9. The extra 1/4 inch length I discovered really effects the math when calculating spring rates. At a .2413 ratio, it takes a whole lot of spring rate increase to make a small increase at the wheels. I will be able to cut these springs for desired ride height and don't have to worry about it becoming too stiff. The extra firmness will be insurance against bottoming out if I go with a very low ride height. When I start working with the front suspension, it will be a very different story because small changes make a real difference. But I will worry about the front later. Edited May 26, 2014 by Cody Texas Jim 1 Quote Click here to visit the main directory for my subforum about my 2002 Eldorado build for autocross racing: http://caddyinfo.ipbhost.com/index.php?showforum=96 Link to comment Share on other sites More sharing options...
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