Kelvin Posted December 8, 2009 Share Posted December 8, 2009 can any one tell me how to work out coil spring weights? my car is about 950kg and i have 200lb springs in the rear but these are way to soft. is there some kind of mathematical equation to figger it out or do i just have to gess and hope its not to hard/soft? any help would be great as i have to get spring custom made so if there rong i carnt realy take them back. what are people running in the rear of similar sized cars? cheers guys Quote Link to comment Share on other sites More sharing options...
Simon Posted December 8, 2009 Share Posted December 8, 2009 Hookes law where x is the displacement of the end of the spring from its equilibrium position; F is the restoring force exerted by the material; and k is the force constant (or spring constant). So if you make a jig so you can put say 10kg or lb pressure on the spring, measure how much it displaces from the equilibrium. I dont know how the springs in a car are measured but this is a way to do it. Heres a calculator from the tech section too... http://www.hraefn.net/projects/spring_rates.php 200lb spring means it takes to 200lb to compress the spring a certain distance. I dont know what that distance is but would bet that it is per inch considering its in pounds. Quote Link to comment Share on other sites More sharing options...
Unclejake Posted December 8, 2009 Share Posted December 8, 2009 I reckon you would be better off deciding how much stiffer you want them in a percentage over the original springs. Quote Link to comment Share on other sites More sharing options...
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