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I know there is a formula out there where you plug in simple #s from the buggy design and it is usually a good starting point. I lost it and would like to know again. Anyone with any knowledgeable info please share. I am also an Ebiach spring dealer.
check FOA shocks website, they have a dual rate spring calculator. http://f-o-a.com/calculator.html
Personal preference? Corner weight the car, figure out the unsprung weight, figure out ride height, buy single rate springs for zero pre-load drooped while getting the desired ride height. If you need a longer spring and must run duals, stick with the same rate springs.
Why would you not want dual rates?
Tender springs are used a lot to keep the main from rattling. Not an issue.