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Spitfire Spitfire swing spring rate

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spitfun

spitfun

Freshman Member
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Ok guys,I have a question. I am trying to up the spring rate on the rear of my autocross car. I am not sure on the stock spring value as I keep finding conflicting information on the web. If I move the lower free spring INTO the pivot box-in essence disabling the swing operation I believe I will stiffen the whole assembly up. My spring values are .330" leaf thickness (5 leaves all the same),1.75" wide,40.5" eye to eye. The spring is 4.25" off the ground so if I put a 1" lowering block in there I shouldn't have any tuck in problems. The calculator I found online (link below) says the spring rate should be about 394 lbs. at that point. What do you guys think?? Thanks Rich LINK: https://www.therangerstation.com/tech_library/leafspringrate.htm
 
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