Stacked LR Spring

[cbrb1]

Has anyone tried with success or failure to use a stacked spring on the LR shock? And also how does it change the handling in and off the corners? Thank you

[billetbirdcage]

If your talking just stacking 2 springs without a lock out nut or stop nut, then it's no different then a single spring of the same rate. Example: 250/400 = 153# so that's the same as running a single 153# spring.

[mb18]

Has anybody tried running as a progressive combo?

[billetbirdcage]

You taking an actual progressive spring or just a 2 step coilover?

[mb18]

I was meaning a 2 step coilover.

[billetbirdcage]

Yes, I pretty sure I was the first person to ever do this (clear back in 2002).


It will just have a stiffer spring rate when the car gets down to ride hieght (if it ever gets there while racing), this can help loosen entry if you have to set the car completely down (like a slow car in front of you). Just think of it as 2 different rates the soft on on rebound (HIKE UP) and the stiff one only once the car gets to ride hieght and compresses some from there.

Course this depends on how you set the thing up, you can have it on the stiffer rate at heights above the ride height. What I have described above is with it setting the stop nut just against the floater plate at ride height.

[mb18]

How do you think the car would react if it was setup so that you had it soft to a point on hike up for tighter entry but stiffer in the last few inches of rebound for tighter exit

[billetbirdcage]

Didn't understand what you said there?

Say your using a 250/400 with a lock nut, the thing will have a 153# rate anytime it is at ride hieght or higher (chassis up on LR) and it would have a 250 rate any time the car is all the way down to ride hieght or lower (LR of car down from ride height).

The question is how often does the car get to ride height out on the track? For some people and/or some tracks this might NEVER happen or others happen regularly or at times. You need to know the exact attitude of YOUR car to know if this could possibly help.

If you where referring to setting it up a little different like I said at the end, remember it is still only 2 rates just you can make it adjust between the 2 at a different place (instead of ride hieght). However you can only move this a very small amount or if trying a larger amount the soft rate becomes not as soft. This means that with the 250/400: It will be the 250 at ride height and lower, but could be more like a 200ish rate in compression and rebound from about ride height to 1" up, then go to the 153# rate from then on out.

Typically a stiffer rate will loosen entry, now exit is a different animal it can go either way depending on how the car is driven. One guy may get more traction off the corner with a softer spring and another lose traction and vice-versa. I have tested this so many times and get different results depending on drivers and tracks, so this is not set in stone by any means. You will have to try it and see what works which way for you and you tracks.