Death Wobble???

[JKRockStomper]

Ok, let me say that it has been years since I have taken an engineering course or even practiced as an engineer. I am currently working in the IT industry so I might not have all terms correct.

I recently lifted a stock 2007 Jeep Wrangler 3" (actually lift is about 5"). I know that the caster has been changed due to the lift but have gone with the recommended adjustable control arm lengths and have not been able to get rid of this wobble.

I provided a video of what the Jeep is doing (

http://www.youtube.com/watch?v=vwiv23dLhMY).

I would love to find out if this could be caster, toe, camber, or something else. I have tried the Jeep forums and got no where.

Thanks

 

[GregLocock]

Can you describe the front suspension architecture, and what you have changed?

It certainly could be castor and/or castor trail.


Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[evelrod]

It could also be tires, dynamic balance, play in the steering linkage/box, toe settings, etc.

Need more info.

Rod

 

[TCAir]

GregLocock is right, you have changed the architecture completely. If you did a block-under-spring style lift you are completely out of luck. That style of Jeep does not do well over 1.5" without complete suspension re-work.

Simplest solution would be to drop it back to 1.5" over factory and use a little taller tire or invest in a well designed system that takes in the vehicles dynamics.

You are going down a road that is well traveled, but not traveled well.

Good Luck

Engineering has always been my love, but it ended up being my second career...

 

[Tmoose]

Your U_tube's first link led to Tricktuner's video. He had a pretty impressive wobble that looks to even have involved tossing the engine back and forth. Looks to have a steering damper fitted, although I'm suspicious the mounting points may cause too little damper travel.

http://www.youtube.com/watch?v=aXN8YtSRm6k&NR=1

He said correcting excessive toe-in fixed most of it.

Looks like even nearly stock Jeeps are not immune.

http://www.youtube.com/watch?v=kng-Tt8H4po&NR=1

No wonder the move to IFS was embraced with gusto in the 1930s.