TheDirtman

For some reason Icon uses a heavier coil on top.

Covalent

The coil is not hitting the stop nuts, it is a little hard to tell from this picture but it is up higher than the lower spring. I am also only running 35" tires. The goal here is to get the full use out of this suspension and not damage anything.



I did a little more research last night and have determined the following:

By spec the stock Rubicon should be 9.375" based on the measurement lcoations below:



I went to the local dealership yesterday and took some measurements at the same location on some stock vehicles:

Vehicle #1: 4 Door Rubicon: 10.0"
Vehicle #2: 4 Door JK: 9.75"
Vehicle #3: 4 Door JK: 9.75"

I then measured my Jeep as it sits and it is 10.75". So my Jeep with the Hemi, winch and Icon suspension is only sitting 0.75" higher than a stock Rubi. That is definitely not the 1.75-4" that the Icon advertises.

I took a look on Icons site and they say that you cannot adjust the stop nuts more than 3.25"

"DO NOT PRELOAD THE COIL BEYOND 3.25” OF EXPOSED THREADS BETWEEN THE BOTTOM OF THE TOP CAP AND THE COIL ADJUSTER NUT. ADJUSTING PRELOAD BEYOND THIS SETTING WILL CAUSE THE COIL TO BIND AND DAMAGE WILL OCCUR TO COILOVER AND/OR VEHICLE."

My coil adjuster nut is near 3.25" right now, with that said I believe that I definitely need to get higher spring rates for the two coils

Effective Spring rate = ( Rate 1 X Rate 2) / (Rate 1+ Rate 2)

Stock Icon Effective Spring Rate = (350 X 200) / (350 + 200) = 127.27

I then measured from the resting position to full droop and found that that travel distance is 7.27"

By calculation only and this could be a little off since there is a pre-load on the springs, the force is (7.27" X 127.27) = 925.25 lbf per side.

For example if I want to get a 3" lift out of this system, and there are infinite combinations here, then I would need something like a (375/425) combination. Am I way out here in left field?

Covalent

I am running 35" tires and with this suspension I am only getting 0.75" of lift with the nuts turned down to almost the max amount of 3.25" that Icon recommends. I believe I need higher rate coils for sure.

How high did your 4.5-6" Icon raise your rig?

TheDirtman

I would wait to figure what you need until you can set the shocks at zero preload with them charged at 150 psi and see how they sit on the jeep because preload and the pressure will have an affect on the coil rate you need. Right now the rates you are suggesting seem high but you also have a 10" shock which would have to take a larger rate to allow for up travel.

Ryan0260

I have mine set fairly low probably in the 3.5" to 4" range. ICON definitely estimates on the high end of actual lift. Many manufacturers average the amount of lift between the front and rear and figure the average in their advertised amount of lift. I am running 37's, and the max adjustment on mine is to be able to clear 40's.