View Full Version : coilovers for a xj

12-05-2008, 03:16 PM
as some of ya know, im going to be tearing down the xj in a few months, once im done gathering part for it and be rebuilding it i was planning on running coils on my xj again, but thats since gone out the window, i wanna run coilovers on the front and then have coils in the back, the back will be no problem to link, but what i am kinda stumped about is what size/spring rates i should use for the front, i want to be able to fit 38`s on it comtforbly, i have no problem at all with doing some body chopping, i want to run either king or fox coilovers but i dont know what size/spring rate, as such to use, just for the front, would a 14" coilover be a good choice?

any info would be awsome, that way i dont order the wrong shit then have to send it back,


12-05-2008, 08:30 PM
Talk to B, he will hook you up, It all depends on the weight of yer jeep and what your plannin on doin with it, Im runnin 175 uppers and 250 lowers and its nice and comfy, just talk to me on sunday at davis, you cant miss my jeep, it'll be the only one on 40's

12-06-2008, 02:17 AM
Talk to B, he will hook you up, It all depends on the weight of yer jeep and what your plannin on doin with it, Im runnin 175 uppers and 250 lowers and its nice and comfy, just talk to me on sunday at davis, you cant miss my jeep, it'll be the only one on 40's

unless mikey makes it ;)

then you will see were 1 ton and v8 gets ya ...[36][36][36][36][36][36]


nick .... 14's will be plenty once the rear is coils ;)

12-06-2008, 02:52 AM
B are you heading up with mikey sunday? make sure your on channel 4 if you do, i`ll come give ya a hand and shit and thanks for the info, once i get a fucking job and start making some scrilla again ill be over at JTC picking your brain B,

12-09-2008, 01:17 PM
the front of that thing should weight abotu 700LB per corner. plus or minus a bit.

Spring rates are relative. on a CO the main purpose is to hold ride height. the valving and oil and nitorgen does the rest. 175 is prity soft for that kind of weight depending on your length. Really any spring will do because of the adjusting collar. But if you run to soft of a spring it will compress alot and then when you flex the spring will un seat, you can use tenders for this but we'll stay away from that for now.

To much and you can't adjust the weight down enought.

the spring rate of a CO is a average of both springs.

(spring rate top x spring rate bottom) / (spring rate top + spring rate bottom)

so in extremeYJ's case its about 100lb over all. the YJ shoudl be around 500 lb per corner of spring weight resulting in his coils compressing abotu 5" or so.

your spring rate will depend on how much up travel you want.
now that you know the weights go from there and find otu how you want the rig to be set-up.

Mudding = more lift
Crawling =low

for bombign down loggin roads i'd say 5" up travel is plenty. and thats right in the sweet spot for a 14" travel CO.

i've always found i like my rigs flexy up front and stiff in the the back. This is one of the claim to fames for the XJ with leafs in the rear and coils in the front. so if you go 14's in the rear then do 16's in the front.

personally i woudl go 12's in the rear and 16's in the front.

everyone thinks flex is key. but its NOT.

12-09-2008, 03:17 PM
Thats dead on dude, I get 5" compression out of my springs with that rate, I set it up for 3" up travel and 13 down, works great for me as I try to stay out of mud and like runnin rocks better.

12-10-2008, 03:14 PM
thats exactly the info i was looking for, thanks kraqa! and yea i perfer the rocks more to the mud but sometimes the mud is in the way of the rocks lol

12-12-2008, 05:53 PM
this is the kinda height im looking to go, roughly the same height im at now, this ones on 37`s, running a 250/300 uppers and lowers, just to give ya a rough idea,


12-12-2008, 07:42 PM
Fuck thats a cool lookin rig.( fer a station wagon) [f]

12-12-2008, 09:23 PM
I like the rear quarter panel gaurds.

12-13-2008, 06:26 AM
im also going to be doing that as well, and im gonna make some steel covers for my fucking tail lights cause ive gone through 10 of them lol

12-13-2008, 03:12 PM
the rear gaurds look liek the peak empire UHMW ones.

with the XJ i woudl keep it as low as you can.

the magic number for ZJ's is 3-4.5" lift with 38's.

the fenders need a bit of workign but it is hella stable. and wheels liek a viking.

12-13-2008, 04:51 PM
oh ya, lol i got NO problem cutting up the body at all, would like to keep it the same height, mabey a little lower but definitly not any higher, supprisingly its pretty stable with the lift thats in it right now and its really nice and smooth to drive,

01-02-2009, 03:22 PM
Rides better without that custom shock you had on it.:D