B Tune Swift Front & Rear Springs

[Ivan141]

It doesnt have to, but you need to do a lot of calculating, and everytime you change one factor, all the others change with it. For example I did some shabby calculations on spring compression of a stock spring (assumed 2kg/mm) vs. 8kg/mm. The 2kg/mm one would compress about 12,5 cm's @ 250kg cornerweight. 8kg/mm would only compress 3,12 cm's at stock length, effectively raising your car 9cm's
To have it at stock height you would need to get an additional 9,4 cm's of lowering from some close windings. You need to take in account the springs wire thickness and soon you'll end up with about 18cm's of useless windings just to get it back to stock height. But this would be incorrect because the springrate of the now much shorter top part would end up a lot higher than 8kg/mm.
Hope this doesnt expose me as being crap at maths but it's just to give you an idea of what the problem is with keeping full uncompressed length with high-rate springs. In practice a few more factors should come into play (the stock springs are actually longer than the suspension stroke so they are preloaded, you can have a shorter spring but it wont have much preload.)