ST Coilover spring rates/sizes

[e36addict]

I've got some cheapo coilovers on the 1er, and I feel that the ride is too soft. I was thinking of changing the springs out for some Swift units.. I was just curious if anyone has done anything like this before? I know the ST springs are progressive, so the rates are pretty much unknown. Just curious what ID/length springs I would need, and what would be a nice aggressive spring rate for the 1er.

I'm fairly new to this chassis so unsure of what spring rates make it happy. I like a firm ride.. for example my E36 has TCK 450/500 and E36/7 has GC 440/650 rates and I love the way both of them ride. The 1 is just too squishy for me.. Thanks for looking, thanks for any help, thanks for telling me to search, thanks for pointing me in the right direction!

[slonik]

http://docs.kwsuspension.de/ga-STXTA...39_1138-14.pdf
on xta model ST used linear springs. you can check specs in pdf.

same springs kw used on their clubsport kit.

[Freon]

Just keep in mind due to the motion ratio of the rear suspension, the front spring rate should be considerably lower than the rear to balance the car. With a near 50/50 weight distribution I'd suggest targeting at least *roughly* the same wheel rate which leads to a considerably higher rear spring rate.

I've seen many coilovers offer a closer to equal spring rate, which seems like a horrible idea with this chassis which is already hampered by understeer from the factory (for various reasons, like lack of front camber, soft front control arm bushings, and staggered tires).