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post #1 of 41 Old 11-13-2013, 10:37 PM Thread Starter
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Coilover questions

I got a used set of fox 14" coilovers off of a CJ-7 crawler with a V8 off the front, I bought them for $400, I do not know the spring rates on them but one, and its a 250. Will I be ok running the spring coils on the front of my JKU? Also sent the coilovers to get rebuilt, turns out all the internals r bad along with the collar locked up and bent shAfts and among some other things. The shop told me to just buy new ones the cost of the repairs equaled the price of two new ones $650. What shall I do? Also I'm running a 1.25" BL and I'll be using synergy coilover mounts up front; should I use 4.5" or 5.5" synergy rear spring to level this out?


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post #2 of 41 Old 11-13-2013, 11:59 PM
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Quote:
Originally Posted by Rexacon View Post
I got a used set of fox 14" coilovers off of a CJ-7 crawler with a V8 off the front, I bought them for $400, I do not know the spring rates on them but one, and its a 250. Will I be ok running the spring coils on the front of my JKU? Also sent the coilovers to get rebuilt, turns out all the internals r bad along with the collar locked up and bent shAfts and among some other things. The shop told me to just buy new ones the cost of the repairs equaled the price of two new ones $650. What shall I do? Also I'm running a 1.25" BL and I'll be using synergy coilover mounts up front; should I use 4.5" or 5.5" synergy rear spring to level this out?


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post #3 of 41 Old 11-14-2013, 07:22 AM
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Sounds like the actual coil overs are far beyond repair, according to your shop.

The springs might still be good, on another set of coil overs.

Now are they the correct spring rate, all depends on the weight of your rig. Thinking the CJ weighs much less than the jk, so you might need different springs as well. I have a bunch of different springs sitting around from setting up the co's on my tj.

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post #4 of 41 Old 11-14-2013, 07:48 AM
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250 over 350 is what we run on our 2 5/8 for the front. For 2.0 - 14 you are going to sit pretty tall with the Synergy Mounts. You will want to go with the tallest rear coil they have…

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post #5 of 41 Old 11-14-2013, 07:48 AM
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Do you know the sprung and unsprung weight of your JK? If yes, there are a couple spring calculators online from reputable companies that can give you an idea of what rates to go with. I also think there is an old thread on here were people share what they are running.

As for getting shafted with busted coilovers, if the money is the same, just buy new ones in my opinion...


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post #6 of 41 Old 11-14-2013, 07:57 AM
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You should start out by getting the weights of the corners on your jeep and decide how much lift you plan on running. Off road evolution typically uses 250/250 on their 12" travel shock. I did not care for the 250/250.

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post #7 of 41 Old 11-14-2013, 10:57 AM
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I just got a set of 14's for my two door. I am starting at 200 over 300 with helper coils for the front and 175 over 250 with helpers for the rear, but plan to tune more from there. What mounts you are using and ride height will make a big difference. Get ready to start reading, because there are a ton of threads on coilover setups. Check out pirate.


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post #8 of 41 Old 11-14-2013, 01:32 PM
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Quote:
Originally Posted by thedirtman View Post
You should start out by getting the weights of the corners on your jeep and decide how much lift you plan on running. Off road evolution typically uses 250/250 on their 12" travel shock. I did not care for the 250/250.
250 over 250? That would yield a straight rate with no transition. Are you sure? One of the big benefits of coil overs is that it is easy to add in a transition between rates.

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post #9 of 41 Old 11-14-2013, 02:18 PM Thread Starter
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Sounds like the actual coil overs are far beyond repair, according to your shop.

The springs might still be good, on another set of coil overs.

Now are they the correct spring rate, all depends on the weight of your rig. Thinking the CJ weighs much less than the jk, so you might need different springs as well. I have a bunch of different springs sitting around from setting up the co's on my tj.
That's what I don't know, the rate number are rubbed off. Yea I figured but I was hoping it would be close enough.
That would awsome!


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post #10 of 41 Old 11-14-2013, 02:24 PM Thread Starter
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Thanks guys great suggestions, I will run Synergy mounts up front, I talked to synergy they said I'd be about 6" of lift.
300/250 is what I'd want run from what I read. I know I have the 250 on them just not sure about that other. I'll check out Pirate just thought I'd run thing over here be4 going there.


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post #11 of 41 Old 11-14-2013, 02:27 PM Thread Starter
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Btw guys I'm at 43" of flex right now with 3" on coil springs, would I be possible to get 60ish with 14" coilovers and 6pack shocks in the rear with 5.5" springs in the rear


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post #12 of 41 Old 11-14-2013, 03:28 PM
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Quote:
Originally Posted by Rock Krawler Suspension View Post
250 over 250? That would yield a straight rate with no transition. Are you sure? One of the big benefits of coil overs is that it is easy to add in a transition between rates.

RK
Call me crazy but wouldn't that be an initial rate of 125 stepping up to 250 after the dual rate stop?
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post #13 of 41 Old 11-14-2013, 03:35 PM
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Quote:
Originally Posted by Rock Krawler Suspension View Post
250 over 250? That would yield a straight rate with no transition. Are you sure? One of the big benefits of coil overs is that it is easy to add in a transition between rates.

RK
Yes that is what they sent me for the front, I thought it was kinda strange as well and it rode to high and too rough for a daily driver/rockcrawler.

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post #14 of 41 Old 11-14-2013, 03:37 PM
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Quote:
Originally Posted by Rexacon View Post
Btw guys I'm at 43" of flex right now with 3" on coil springs, would I be possible to get 60ish with 14" coilovers and 6pack shocks in the rear with 5.5" springs in the rear



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Does this make any sense to anyone else?

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post #15 of 41 Old 11-14-2013, 03:40 PM
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Quote:
Originally Posted by thedirtman View Post
Does this make any sense to anyone else?
I am guessing he is measuring the distance under one tire when the JK is at full stuff like a fork lift flext test and he is trying to gain an additional 17" of "flex" by only raising the JK ~3" more inches...


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post #16 of 41 Old 11-14-2013, 03:41 PM
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Call me crazy but wouldn't that be an initial rate of 125 stepping up to 250 after the dual rate stop?
Dont think so. I think its like one long 250 spring. If the two springs were parallel to each other, than each one gets half the weight and they would be 125 springs. Just me though


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post #17 of 41 Old 11-14-2013, 03:41 PM
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Originally Posted by thedirtman View Post
Does this make any sense to anyone else?
Maybe he is talking one front wheel on a ramp or fork lift before any other wheel comes off the ground?

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post #18 of 41 Old 11-14-2013, 03:42 PM
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I was talking about the section that asks about running 5.5" coils, 6 pack shocks, and coil overs all on the rear. I would be curious on his definition of flex as well.

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post #19 of 41 Old 11-14-2013, 03:43 PM
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Quote:
Originally Posted by thedirtman View Post
I was talking about the section that asks about running 5.5" coils, 6 pack shocks, and coil overs all on the rear. I would be curious on his definition of flex as well.
No Poly brackets and 14" coilovers up front. 5.5" coils and six packs in the back...


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post #20 of 41 Old 11-14-2013, 03:45 PM
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Quote:
Originally Posted by thedirtman View Post
Does this make any sense to anyone else?
Not really.

I think if you were able to get every inch of travel out of the suspension you would have something like:

14x4= 56"

That would be fully bottomed out at opposite corners and fully extended at the other corners.

I think you usually want to limit the extension about an inch via limiting straps and full compression by an inch or so via bumpstops

So realistically probably something more like:

12*4=48"

I might be thinking about it wrong too, because tire size plays into this as well.


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post #21 of 41 Old 11-14-2013, 03:58 PM
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I would think it would be more then 14"*4 to determine max suspension travel. Wheel base and track will have an effect on it as well. I would really doubt 60" running 14" coil overs and 6 packs.

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post #22 of 41 Old 11-14-2013, 04:12 PM
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This chart indicates WB doesn't really have an effect on the amount you can lift one tire while others remain planted (at least in stock configuration)

2 door vs 4 door with stock suspension



Source: http://www.edmunds.com/jeep/wrangler...html.html.html


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post #23 of 41 Old 11-14-2013, 04:15 PM
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Originally Posted by ALASHA View Post
Dont think so. I think its like one long 250 spring. If the two springs were parallel to each other, than each one gets half the weight and they would be 125 springs. Just me though
But its not 1 long spring, its two springs each rated at 250lb/in. If you stack them and put 250lbs on top it will compress both springs, 1" each for a total of 2 inches or 125lb/in
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post #24 of 41 Old 11-14-2013, 04:21 PM
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Originally Posted by Hammered View Post
But its not 1 long spring, its two springs each rated at 250lb/in. If you stack them and put 250lbs on top it will compress both springs, 1" each for a total of 2 inches or 125lb/in
so if I am holding 100 pounds over my head and stand on your shoulders, you are only supporting 50 pounds (excluding my own weight)?


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post #25 of 41 Old 11-14-2013, 04:32 PM
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so if I am holding 100 pounds over my head and stand on your shoulders, you are only supporting 50 pounds (excluding my own weight)?
No. If you stack two 250lb/in coils and put 250lbs on top each coil will compress an inch. The top coils has to hold 250lbs, the bottom coil has to hold 250lbs plus the other coil. They will both compress an inch. That means your shock will compress 2". If 250lbs compresses your shock 2" your spring rate is 125lbs.

If you put the two coils side by side and put 250 pounds on top of both they would only compress .5"
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