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Originally Posted by Apexfreak
They are. I don't know why these types of rates are so often mis-quoted, but we tested them and put stock shocks (off of a stock Spec V) on a shock dyno and the rates were the other way around. I'll try to find the data sheet.
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OK found it. Its a good data sheet with all the stock sprung, unsprung and corner weights motion ratios, tire rates, wheel rates etc.
Stock spring rates for a Nissan Sentra Spec V are 175# front 160# rear. There is no way an aftermarket company selling springs for the street would change the rates that dramatically, only increase it as nessassary to prevent bottoming out after lowering the car.
Interestingly enough the theoretical ideal weights for the springs listed are 163# front 140# rear (averaged between corners, by natural frequency) or (by wheel rate % or corner weight) 520# front 350# rear.
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