Hello All,
I noticed that there were some questions on our springs, so I thought I would chime in. To keep a long story short, our DF210 springs are linear rate springs, thus providing stable characteristics when cornering. But to get the whole story, please read on.
These pictures were taken a few minutes ago, and pls excuse the brightness - it's a very sunny day today in SoCal
What you'll notice from the 2nd picture is the tighter grouping of coils (the area within my finger tips). These are known as "dead coils." The benefit of having this set of coils in our spring is that it prevents the spring from dangling while allowing an aggressive drop. Compare this to a spring which is simply shorter in length with higher stiffness. A shorter spring will dangle when the suspension is expanded, in situations such as driving over a sharp bumpy area.
If you've ever seen these springs mounted on the car, with the car standing on the ground, you'll notice that the dead coils will be touching each other, and cornering will be affected primarily by the main coils. But when driving over a sharp bump, the dead coils expand, keeping the spring positioned properly within the strut perches, which is good for the strut, and good for your comfort.
Sorry for the lengthy reply, but I hope you have a better understanding of our springs now. If there are any questions, feel free to reply, pm, or call in.
Thanks!