RCD shock and mount numbers.

[chad551]

You should go with 800lb springs. I have them on my ST now.Looks like I was mistaken Hypercoils website is not showing a 800lb 14" spring, sorry about that.

Chad

 

[carlover]

You should go with 800lb springs. I have them on my ST now and I am considering going to 900lb.

Chad

Where did you get your springs?? Are you running a 14 or a 16" spring?? They are hard to find with those lenghts and spring rates.

 

[chad551]

I have 12" springs. But I also have not tightened them up very much either. I still have about 3-4" of thread left. But I was concerned about the springs compressing to much and not allowing the full 6.5" of travel. Plus I need to get a coilspring tool.

 

[carlover]

Yeah i need a 14" spring and those dont seem to be made in a heavy enough spring rate. Ohh well im guessing its a two spring setup for me..

 

[cmax13007]

Yeah i need a 14" spring and those dont seem to be made in a heavy enough spring rate. Ohh well im guessing its a two spring setup for me..

I am currently using the 14" 650lb/in spring rate and its not enough. I am working on specin out dual springs. I'll let you all know what I find out.

CMAX~

 

[cmax13007]

I have 12" springs. But I also have not tightened them up very much either. I still have about 3-4" of thread left. But I was concerned about the springs compressing to much and not allowing the full 6.5" of travel. Plus I need to get a coilspring tool.

Why the coilspring tool??

CMAX~

 

[cmax13007]

Dual Spring Rate Info:

Just finished talking with Sonny at downsouthmotorsports and he cleared up alot of our questions about this setup. The following are the question and answers per our conversation:

Question 1: Can I run a 8” main with a 6” tender on the 8.5” Fox Coil-over (part# 980-99-003A)?? I am currently limiting the travel to about 6” with limit straps.

Answer 1: It is possible, but a 6" tender spring is non-standard from hypercoil ($$$$$-he is checking on pricing), therefore the 10" main and 4" tender setup is recommended.

Question 2: Dual Spring Rate Calculation???

After doing some research I came up with this equation for dual rate spring setups:

SRi=initial spring rate
SRm= spring rate of main spring
SRt= spring rate of tender spring
Dual Spring Rate Equation: SRi=(SRm x SRt)/(SRm + SRt)

After doing a few calculations I find that with SRm=800 and a SRt=800, I get SRi=400lbs. Now correct me if I am wrong, this means my initial spring rate would be 400lb/in and once the tender compressed completely my final spring rate would be 800lb/in=SRm.

Answer 2: Yes, the calculations are correct. Unfortunatly, a 4" tender is not made in a 800lb/in spring rate. Therefore, the tender spring is reduced to 600lb/in. Re-calculating gives us a 342lb/in initial spring rate.

Questions 3: Considering my setup now will that 400lb/in initial spring rate be obsolete. How I understand it is that this initial spring rate (400lb/in) is much less that the 650lb/in I use now. I am guessing the weight of the vehicle will just compress the tender right away and not even be effective. Is this the correct thinking???

Answer 3: Correct. The tender may have little or no effect because the vehicle weight is so high.

Conclusions:

Option A: (Recommended)
10" main at 800lb/in
4" tender at 600lb/in
SRm=800lb/in - final spring rate
SRi=342lb/in - initial spring rate
-Tender is most likely to be compressed by the vehicle weight. Obsolete?? Probably only going to act as a spacer.

Option B:
8" main at 800lb/in
6" tender at 1300lb/in (non-standard part)
SRm=800lb/in - final spring rate
SRi=495lb/in - initial spring rate
-Tender is less likely to be compressed by the vehicle weight. Therefore, it may be effective (again, $$$$). Additionaly, I have added another 100lbs of nitrogen to the shock reservoir. I am told it like adding another 100lbs of spring rate to the main spring giving a SRm of approximately 900lb/in. Recalculating would give a SRi of approximately 531lb/in. The question is are these valuable tradeoffs???

Once I get some solid pricing I will be sure to post it.

CMAX~

 

[CDW6212R]

That's good information, bookmark or save that.

 

[cmax13007]

How are the pictures guys?? Any Questions.....

CMAX~

 

[chad551]

I need the coilspring tool so I can tighten my springs without removing the shocks. I dont want to use a screwdriver any more because it is messing up the spring nuts.

I looked at the pics, what did you modify on the brackets? They look exactly like mine do?

 

[cmax13007]

I need the coilspring tool so I can tighten my springs without removing the shocks. I dont want to use a screwdriver any more because it is messing up the spring nuts.

I looked at the pics, what did you modify on the brackets? They look exactly like mine do?

I just take the weight of the shock and tighten the springs down with the spaner wrenches and once it got hard I just used a bar for more leverage. If you do not have them call up sonny and he will ship them for like 16 bucks.

The upper brackets I had to grind underneeth the shock mounting holes to gain clearence for the shock. You did not need to do this since you used the 6.5" C/O. It was a clearence issue when installing the longer 8.5" C/O. If you would like I can upload a picture showing where I made my changes. The only other modification was drilling out the shock eyelets to 5/8". I then press fitted 5/8"OD spacers into the shock eyelets (spacer ID was 1/2"). I picked the spacers up at the local hardware.

CMAX~

 

[cmax13007]

My 12" 600# ones did that. I now run 12" 750# springs

The bilstien shock that comes with the RCD kit self limits way before CV angles get severe.

Is it the shock that is self limiting your travel or is it your ball joints???

CMAX~

 

[William Schumacher]

Is it the shock that is self limiting your travel or is it your ball joints???

CMAX~

I'm also running the eibach 12" 750 lb springs on the rcd lift kit.
my springs are cranked all the way on the drivers side,the passenger side isn't too far behind.
I have them cranked to match the lift in the rear,4 dr leaf pack {SOA} on my 2 dr.

they have really softened up in the front,I have that body roll feeling that the 600lb springs originally had.

Something else I've noticed is,nobody is using the full RCD lift kit up front.
{Except Boomin},the RCD was 5" lift,and I thought you guys had mentioned
the superlift kit being only 4" ?

what type of lift {spring /shock setup} are you guys running in the rear ?

again :
I have the 2dr so my SOA maybe too high with the 4dr leaf pack ?
and I'm worried it COULD cause problems trying to level out the truck to the rear ?

 

[MountaineerGreen]

I SOA'd mine, even with 4" superlift, maxed TT, I couldn't get it even close to level. I tried softer, flatter springs, finally gave up and put it back like it was.

 

[cmax13007]

I'm also running the eibach 12" 750 lb springs on the rcd lift kit.
my springs are cranked all the way on the drivers side,the passenger side isn't too far behind.
I have them cranked to match the lift in the rear,4 dr leaf pack {SOA} on my 2 dr.

they have really softened up in the front,I have that body roll feeling that the 600lb springs originally had.

Something else I've noticed is,nobody is using the full RCD lift kit up front.
{Except Boomin},the RCD was 5" lift,and I thought you guys had mentioned
the superlift kit being only 4" ?

what type of lift {spring /shock setup} are you guys running in the rear ?

again :
I have the 2dr so my SOA maybe too high with the 4dr leaf pack ?
and I'm worried it COULD cause problems trying to level out the truck to the rear ?

I have the entire superlift kit, which included the rear springs. After installing the superlift the rear was sagging compared to the front. I then added the warrior shackles. That then put the front lower that the rear. I tried the torsion bar twist and still did not get my X sitting level. Looks just like mountaingreens picture above.

Since my new install with the coil-overs I have been trying to find the right spring rate. My first try is a 14" 650lbs spring up front. At the beginning my X sat close to level. I then took sonny's (downsouthmotorsports) recommendation to add a nother 100lbs of nitrogen into my shock reservior. This helped until after 2-3 weeks my springs broke in and started sagging. Back to square one.

The solution is a higher spring rate. I am looking at 850lb spring rate which probably will result in a true 800lb spring rate after break in (says sonny). My only issue is weather or not a 12in spring will work with my 8.5" C/O's and/or I have yet to find a 14" spring with 850 lb spring rate. If anyone has seen one, please let me know.

Progress is going slow. I just have not yet had the time to work on my X. This past weekend I helped a buddy put a 2" BDS system on his WJ. Its not a horible system or install, but it is a jeep and definately no explorer!!!!! I am going to measure this week to see if the 12" spring will work. I will keep you all informed.

CMAX

 

[cmax13007]

I SOA'd mine, even with 4" superlift, maxed TT, I couldn't get it even close to level. I tried softer, flatter springs, finally gave up and put it back like it was.

Did you post this photo via explorerforum's gallary??

CMAX

 

[William Schumacher]

whatever happened to the dualrate setup ?,
would there have been a problem with this type of a setup ?

I called Eibach and the guy we need to speak with {Adam} should be back from Daytona on Tuesday sometime.

he IS supposed to be an expert with this stuff !

 

[MountaineerGreen]

Did you post this photo via explorerforum's gallary??

CMAX

Yup.

I am now wondering if I can find a spring rate that will work with my considerably heavier 5.0 Mounty??

 

[cmax13007]

whatever happened to the dualrate setup ?,
would there have been a problem with this type of a setup ?

I called Eibach and the guy we need to speak with {Adam} should be back from Daytona on Tuesday sometime.

he IS supposed to be an expert with this stuff !

This is going to confuse some of you. I technically can run a dual spring setup, but given our application it will not be a "true" dual rate setup. Meaning, I can setup the C/O's to use two springs that in combination with eachother the total length would be 14", but the second spring would compress and not be useful. Therefore, it would not be a "true" dual rate setup. A huge waste of money in my opinion.

Spring Info:

This particular application is extreme when using the 2.5" O.D. springs. If a 3.0" O.D. spring would fit, it would only take 300-400lb spring rate to support the front end. This is because the larger diameter displaces the weight differently. I was told a ton of other factors also play apart in this setup and the only way to find what works best is to experiment. That is what I am trying to do. Hopefully I get it right soon because its getting priceeeeeeee.

CMAX

 

[cmax13007]

Yup.

I am now wondering if I can find a spring rate that will work with my considerably heavier 5.0 Mounty??

If you could figure out how to modify the top shock mount to give clearence for a 3.0 O.D. Spring you could get a much lower spring rate 250-400 lbs I'm told. Anyways, just an idea.

CMAX