Can someone explain Progressive Rate springs?

[Jb325is]

Some guy wants to sell me some Jamex progressive rate springs, he says they are "20% firmer at the low rate and 60% firmer at the high rate" Can someone explain to me the concept of progressive rate springs and what this means? Are these springs gonna be stiff enough for auto-x and such or are they basically for looks?

[Rob]

that means basically that the springs start out at a lower rate (softer) and at some point during compression, they become a higher rate (stiffer). Progressive springs are perfect for street driven cars, as they can be comfortable over bumps and such (the initial soft rate) yet get firm with extreme compression during hard driving (the higher rate)

hope this helps

[reelizmpro]

Oh yeah, my buddy was testing an Eibach Group N spring so we could see how the spring works (coil binding). It's supposed to start at like 500 or so and end up around 1200lbs/in! Upon compression, the coils at the end compress and bind together basically being inactive, then the larger spaced coils go to work increasing the overall rate of the spring. This type of spring is stiff when you need it to be (proggressive) and not all the time (linear).

[808BMW]

Re: Can someone explain Progressive Rate springs?

Are these springs gonna be stiff enough for auto-x and such or are they basically for looks?

It's been said that if you are seriously auto-x'ing, then linear springs are better than progressive springs, because the spring rate stays the same and is more predictable than a progressive spring.

[Digitalwave]

Aren't most springs such as H&R Sports and the Eibach Pro-Kits progressive, while Eibach ERS springs are linear?

[reelizmpro]

Aren't most springs such as H&R Sports and the Eibach Pro-Kits progressive, while Eibach ERS springs are linear?

Yes.