I figured out my motion ratio by plugging my front suspension numbers into the calculator on the Hypercoils website.
http://www.hypercoils.com/spring-calculator Then I put my numbers into the frequency calculator here.
http://www.racingaspirations.com/mods/kuhe8zbuAnd here.
http://www.racingaspirations.com/mods/7qvvjb1nFrom what I have read about suspension setup, I should shoot for a frequency of about 2.2Hz front and 2.5Hz rear for an autocross car. I am currently at 1.96 front and 2.38 rear, which feels like it rides pretty soft to me. I have also read that when people start at 2.2/2.5 they end up going stiffer a lot of the time. 400lb/in front and 200lb/in rear will give me 2.26/2.51Hz. 450lb/in front, 225lb/in rear will give me 2.4/2.66 Hz, which still doesn't see like a huge jump from where I am now.
I wonder if I should order both or just go straight to the stiffest set? I'm kind of leaning towards the stiffer setup. It should still ride softer than my pickup, which I put about 75000 kms a year on. It's an F-250 with rear springs that have 3 times the payload capacity of the stock ones, so I'm used to feeling every imperfection in the road. I've found with work trucks that a stiffer suspension might ride rough when going slow, but it really does work better when you crank up the speed on rough roads.
Kristian
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V6 in a book frame build. Now registered.
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