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Old 06-04-2014, 07:57 AM   #1
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Jeep unstable

Hi
My family has gotten a jeep wrangler last year and me and my dad tried modding it we added a 2.5" suspension kit to raise the height we also swapped the wheels for much wider wheels i.e from 16x8 to 16x10.
My dad complained that the car feels on the verge of tipping whenever he tries to turn into a corner. Is this an after effect of adding the suspension kit or wheels? Also how can we correct this as the car feels unstable when he goes into the corner

Hope to hear from you guys!
Thanks

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Old 06-04-2014, 08:06 AM   #2
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confused!! you lifted your jeep but your car is not stable?

you need to share more details about the lift and post lots of pics.. for a starter I guess you have not lifted your jeep correctly and/or you got incomplete lift

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Old 06-04-2014, 08:20 AM   #3
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Find a local Jeep club.

Have someone else drive it.

It could be that your Dad is unfamiliar with how the higher center of gravity will feel. There is a reason they dont use Wranglers in those "fast and furious" drifting movies.

So it might be that the rig is right...but you dont like the feel.

On the other hand the lift might be wrong.

Only way to tell is to have someone check it out.
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Old 06-04-2014, 08:36 AM   #4
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So much of its stability is based on the kit you installed. I have the mopar stage 3, 3" lift with 17x9 wheels and 315 duratracs and id say my jeep has less body roll and handles better than stock as far as cornering goes. Likely in part due to added track width provided by wider wheels/tires.
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Old 06-04-2014, 09:03 AM   #5
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Did he put shocks on it?
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Old 06-04-2014, 09:22 AM   #6
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Sway bars connected properly?
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Old 06-04-2014, 09:38 AM   #7
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Is the sway bar disconnected? (dammit... this is what I get for not hitting post and going back to a work email)
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Old 06-04-2014, 12:50 PM   #8
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Feeling like "it's on the verge of tipping when turning" sounds like excessive roll. As Steve said, make sure the sway bars are connected.

What lift did you install?

Who installed it?
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Old 06-04-2014, 01:22 PM   #9
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It could be so many things IMO.

What lift and parts included ?
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Old 06-11-2014, 08:09 AM   #10
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I got the following kit:
Rubicon Express Coil Spring 2.5 Inch Suspension System Jeep Lift Kit
We installed by ourselves. There isn't a jeep owners club here as there are very little people who own a jeep here.
We installed the shocks on but removed it and replaced it with the original one as it felt too hard on the ride. Erm the sway bars looks fine to me but what are u guy's definition of properly?
looking forward to your replies
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Old 06-11-2014, 08:19 AM   #11
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Quote:
Originally Posted by liren92 View Post
I got the following kit: Rubicon Express Coil Spring 2.5 Inch Suspension System Jeep Lift Kit We installed by ourselves. There isn't a jeep owners club here as there are very little people who own a jeep here. We installed the shocks on but removed it and replaced it with the original one as it felt too hard on the ride. Erm the sway bars looks fine to me but what are u guy's definition of properly? looking forward to your replies
If you put the original shocks back on, they are too short unless you put shock extensions on.
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Old 06-11-2014, 08:20 AM   #12
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Quote:
Originally Posted by liren92 View Post
I got the following kit: Rubicon Express Coil Spring 2.5 Inch Suspension System Jeep Lift Kit We installed by ourselves. There isn't a jeep owners club here as there are very little people who own a jeep here. We installed the shocks on but removed it and replaced it with the original one as it felt too hard on the ride. Erm the sway bars looks fine to me but what are u guy's definition of properly? looking forward to your replies
1) the originals are way to short for that lift
2) they are soft its gonna produce more body roll (your chief complaint)
3) please make sure you did not install a 4 door system into a 2 door as that would give you a ton of lift and throw off you steering geometry
4) make sure your track bars are at a good operating angle. If not look at brackets.
5) needs to be as close to parallel as you can get them.
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Old 06-11-2014, 11:12 PM   #13
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All good advice but before you start going through the suspension looking for issues, I'd get a second opinion. You must know someone who drives a Jeep or even a four wheel drive truck like a Toyota. Jeeps are a bit different to drive than most vehicles. When I sold my long bed quad cab V-10 dodge truck and bought a 99 Jeep, it felt as if it was spinning instead of turning, the effect of having the rear wheels two feet behind me instead of 12 feet.

Maybe you do have an issue but maybe your dad isn't used to lifted vehicles. If a Jeep or truck guy, maybe even a mechanic, thinks it's squirrelly then start checking things out. However, only you can decided if it feels dangerous. We can't so use your judgement.
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Old 06-12-2014, 06:33 AM   #14
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Quote:
Originally Posted by liren92 View Post
I got the following kit: Rubicon Express Coil Spring 2.5 Inch Suspension System Jeep Lift Kit We installed by ourselves. There isn't a jeep owners club here as there are very little people who own a jeep here. We installed the shocks on but removed it and replaced it with the original one as it felt too hard on the ride. Erm the sway bars looks fine to me but what are u guy's definition of properly? looking forward to your replies
First, did you loosen all the control arm and track bar bolts, and torque at ride height? Some people won't or tighten bolts with the axles hanging down. This can cause issues. If not right away .. Down the road.
Next, I would take it in and have have the alignment checked out. There's a very good possibility ... caster is on the low side... causing the flighty unstable feeling. Does this sound like your issue here ?
Jeep Jk, Caster and lifting.

Plan on a set of front lower CA's, or drop brackets to increase caster to 4*-5*
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Old 06-16-2014, 09:19 AM   #15
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Also roll center can affect the way it handles. My 2.5 rk lift came with a track bar bracket that raised the roll center to match increased height.
have since swapped different parts in/out and now my front and rear track bars are on slightly different planes. I can feel it. So if yours are still stock (and I did not see that there were either drop or lift brackets in your link) the lift did raise the center of gravity without addressing the roll center. Also leads to a feeling of instability.
I am not an expert, have read enough to recommend you phone the tech guys at poly performance or rock krawler. Very informative and helpful for me.
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Old 06-16-2014, 11:16 AM   #16
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Quote:
Originally Posted by coilrod View Post
Also roll center can affect the way it handles. My 2.5 rk lift came with a track bar bracket that raised the roll center to match increased height. have since swapped different parts in/out and now my front and rear track bars are on slightly different planes. I can feel it. So if yours are still stock (and I did not see that there were either drop or lift brackets in your link) the lift did raise the center of gravity without addressing the roll center. Also leads to a feeling of instability. I am not an expert, have read enough to recommend you phone the tech guys at poly performance or rock krawler. Very informative and helpful for me.
Higher rear is preferred. synergy runs a higher bracket (4") when running a front steering correction kit with raised front (3")
The other rear bracket and like RK's is 3" I believe.
My Rear TB is set using TF's 2nd hole @ 4"
Front Artec bracket raises the TB 3"

I completely agree, this is from the lift sticky

Roll center/trackbar brackets adding lift height lowers the jeeps roll center. this can cause poor corner handling/steering. Raising the track bars at their mounting points will return the roll center to stock or higher. also keep the axle better centered during articulation.
oversteer/understeer Raising the rear track bar alone (front remains stock)= A positive roll axis/understeer. a little understeer is a good thing.
Raising the front trackbar alone (rear remains stock)=a negative roll axis/over steer. oversteer can cause handling to be unpredictable. you definitely don't want this.
Most kits in the 2.5+ range will address the rear. Notes:
- A shorter wheel base 2 door, oversteer/understeer will be more pronounced.
- The front track bar can not be raised without flipping the drag link or running a drop pitman arm (see steering correction kit)
- track bar drop brackets only purpose is axle positioning or axle center. usually supplied in cheaper kits.

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