[usmcdoc14]

I figure start this now for the people wanting to run coil overs
List your:
Shocks
Length
Numbr of coils (single, dual, tri, keeper, etc)
Coil (s) length
Coil rates
number of doors
And lastly valving.

Also be subjective on if you like/don't about your handling.

This will come in handy as luckily we are running similar weight/wheelbase vehicles so provides a nice starting point for those thinking of running coilovrs (myself )

For those guys running a cantilever setup if you could include the ratio of your setup so we can figure the rate 1:1

 

[desert dog]

Kings and Poly Performance mounts front and rear. Normally running 4" of lift height (will vary depending on what area I plan to wheel in) and 40s.

FRONT COILOVERS
12" Shocks
Dual springs: 14" compression, 12" rebound
Rate: 200 over 300

REAR COILOVERS
12" shocks for general use (have 14" shocks for the rear for special occasions too)
Dual springs: 14" compression, 12" rebound
Rate: 250 over 250

Shocks are custom valved and charged by off-road legend Richard "Goatman" Gauthier.

This set-up is fantastic for rock crawling and daily driving, but a little too spongy for Baja racing or jumping in the dunes. But having said that, it does run smoother at high speed on the dirt roads than my regular coil/shock set-up did - and the King air bumps work fantastic for playing in the dunes. I wanted my JK to own the rocks and drive smoothly to the trail, and I achieved that goal. If I lived in an area where most wheeling is dirt roads and mud, Id go with higher rate springs.

 

[andrelopez99]

For those guys running a cantilever setup if you could include the ratio of your setup so we can figure the rate 1:1

splain! no-nintendo?

 

[THECHAD]

4dr about 6 1/2" lift 14" fox coilovers front and rear. Front tribe mounts running 250 over 425
Rear 200 over 500 custom mounts floats on 40s rides like a cadilac. Wouldn't change anything


Sent from my iPhone using Tapatalk

 

[jkruby]

i've got almost the same rates as desert dog on the front but have not installed them yet. good to see i was in the ball park! great idea on the thread should help ppl on the tuning curve
14's
220/300
med compression
med rebound

 

[Dr.Dirty]

12 inch fox 2.0 dual rate front and rear with Tribe 4x4 mounts and Poly rear mounts.

Springs rates

Front 500lb 10inch over 450 12 inch
Rear 500lb 10 inch over 250 12 inch





Rear install write up

Front Tribe 4x4 write up


Im my opinion these are not the ideal spring rates for the rocks. Im going to be going to 350/250 and out back 300/200

On the road handling is amazing. the Jeep has great offroad manners as well but i feel like im losing some uptravel do to a heavy top spring.


I wanted to stay right around 4.5 inches of lift with the current springs im right at 4 inches of lift

 

[usmcdoc14]

splain! no-nintendo?

a cantilever setup will be a ratio that is not true 1:1, ie for each in of travel at wheel an inch travel at shock. This also applies to shocks in front of the axle centerline but still on the axle tube but not enough to be a concern for our application.

For example a shock mounted 1/2 way on a lower (middle) would see 1/2" travel for every inch of wheel travel. this would also double the force on the spring and valve. Same with a fancy cantilever setup that uses a free arm and links. So if you were using a 300lb spring on the tube it would require a 600lb spring on the halfway point of a control link. Your valves would also be working twice as hard because it would be dampening 1inch in 1/2 inch of movement.

Simple lever principle.

A similar thing also applies to shocks mounted at a severe angle, but one again not really applicable to our application.


Oh ya, mention if you are 4dr or 2dr in your specs

 

[usmcdoc14]

great idea on the thread should help ppl on the tuning curve

ya springs can get fawking pricey when you are tuning. also on pirate there is a "spring trade/swap" thread that can play out for you to save cash as well

 

[Dr.Dirty]

ya springs can get fawking pricey when you are tuning. also on pirate there is a "spring trade/swap" thread that can play out for you to save cash as well

I know that thread well.. Ive been looking at swapping mine out but just havent had 400 spare bucks to toss out and most guys there are looking for lighter springs.

 

[AReed]

Fox 16" remote Res front and rear, 2 door, 112"WB, 5300lbs
Front - Tender up top, 14" 200lb spring, 16" 300lb spring, .015 flutter with a .010 on rebound.
Rear - Tender, 14" 175lb spring, 16" 250 lb spring, .015 flutter valving with a .010 stack on the rebound side

Also doing coilovers in the front of a 4 door in about a month. It will run Fox 12" emulsion coilovers with 200/300 springs, base valving at 40/40 with 2.0 triple bypasses. I have to mess with that valving upon install but I'll let you know when it happens.

Bypass valving is 90/50

 

[redx08]

Front 14 inch travel RRD rock krawler emulsion, triple rate setup
Keeper spring, 12-250, 14-350

Ill tell you next week how it rides

 

[andrelopez99]

a cantilever setup will be a ratio that is not true 1:1, ie for each in of travel at wheel an inch travel at shock. This also applies to shocks in front of the axle centerline but still on the axle tube but not enough to be a concern for our application.

For example a shock mounted 1/2 way on a lower (middle) would see 1/2" travel for every inch of wheel travel. this would also double the force on the spring and valve. Same with a fancy cantilever setup that uses a free arm and links. So if you were using a 300lb spring on the tube it would require a 600lb spring on the halfway point of a control link. Your valves would also be working twice as hard because it would be dampening 1inch in 1/2 inch of movement.

Simple lever principle.

A similar thing also applies to shocks mounted at a severe angle, but one again not really applicable to our application.


Oh ya, mention if you are 4dr or 2dr in your specs

Got it Doc... Thanks for the clarity.. I'll post specs of my 2 dr OFE setup.. just not sure on the valving due to EVO/KING using their own specs..

 

[trooper1]

Help

I have 14" SAW coilovers w/resi. Yet to install because I have no understanding. Can someone please give me a jump start? They are set up for dual rate. What length of springs and compression? :mr-t:JKU, weighs about 4800 lbs. I dont drive it much because I have a work vehicle. I would like it to run smooth on the road and then tackle climbs and some minor to medium rocks. Any information would be a great help. Will be running Tribe 4x4 front and Rebel Offroad rear thru the tub. Thanks in advance for information to set this up.:mr-t:

 

[usmcdoc14]

I have 14" SAW coilovers w/resi. Yet to install because I have no understanding. Can someone please give me a jump start? They are set up for dual rate. What length of springs and compression? :mr-t:JKU, weighs about 4800 lbs. I dont drive it much because I have a work vehicle. I would like it to run smooth on the road and then tackle climbs and some minor to medium rocks. Any information would be a great help. Will be running Tribe 4x4 front and Rebel Offroad rear thru the tub. Thanks in advance for information to set this up.:mr-t:

lets start
1) depends on what you plan to do with it will dictate rate and valving. the dual rate is basically when the first (lighter lb) spring reaches its max compression in either LB or when touching itself then the next (higher) lb spring takes effect. it is progressive instead of linear, you just need to figure what you want your ride to be like first.
You would want a main (lower) that is 2" or so LONGER than your travel and an upper that is 2" or so less.

Then read and ask here or Pirate4x4's thread dedicated to shock tuning or contact a reputable company (Poly Performance, Fox, FOA have all been VERY helpful in assisting people with tuning shocks)

2) put your JKU on a scale, I think you are a couple hundred pounds shy of what its curb weight is

 

[BenFoo]

Springs rates

Front 500lb 10inch over 450 12 inch
Rear 500lb 10 inch over 250 12 inch

Isnt that backwards? I thought the tender spring was to be a lower rate than the main? I guess technically it doesn't have to, but that seems backwards......

 

[THECHAD]

Top is the tender which is the light one, main spring on bottom is the heavy weight spring. But it only really matters if you are using the adjuster, to limit how far the tender can compress


Sent from my iPhone using Tapatalk

 

[BenFoo]

I found an interesting formula to tell you spring rates if you dont know what yours are and they dont have any markings on them. All you need is a caliper that measures in mm and some math skills.


(wirediameter^4*80400)/(8*ccdia^3*number of active coils)

This gives you the result in N/mm

ccdia = center to center diameter. 2.0 coilover springs are 2.5" (63.49999999993142 mm)

To get lbs/in multiply your answer by 5.71014716277 (1 N/mm = 5.71014716277 lbs/in)



Anyone with known coil rates want to test this out and see how accurate the formula is?

 

[Rock Krawler Suspension]

12 inch fox 2.0 dual rate front and rear with Tribe 4x4 mounts and Poly rear mounts.

Springs rates

Front 500lb 10inch over 450 12 inch
Rear 500lb 10 inch over 250 12 inch





Rear install write up

Front Tribe 4x4 write up


Im my opinion these are not the ideal spring rates for the rocks. Im going to be going to 350/250 and out back 300/200

On the road handling is amazing. the Jeep has great offroad manners as well but i feel like im losing some uptravel do to a heavy top spring.


I wanted to stay right around 4.5 inches of lift with the current springs im right at 4 inches of lift

Holy Cow, those are some heavy rates! Where you are headed with the rates should be money! But, you might have to have a valving adjustment to compensate for the rate change...

RK

 

[BenFoo]

I found an interesting formula to tell you spring rates if you dont know what yours are and they dont have any markings on them. All you need is a caliper that measures in mm and some math skills.


(wirediameter^4*80400)/(8*ccdia^3*number of active coils)

This gives you the result in N/mm

ccdia = center to center diameter. 2.0 coilover springs are 2.5" (63.49999999993142 mm)

To get lbs/in multiply your answer by 5.71014716277 (1 N/mm = 5.71014716277 lbs/in)



Anyone with known coil rates want to test this out and see how accurate the formula is?

No one wants to do some math. No no... Its cool.


Sent via Telegraph.

 

[THECHAD]

Another thing to remember is the more angle on the Coilover the larger the spring rates will be, so when you pick your setup find someone running the same setup before you start buying the coils


Sent from my iPhone using Tapatalk