Air bumps installed...& shock end question

[HeavyMetal]

I seem to have toasted a rubber bushing on the axle end of my shocks in an extra quick fashion for some reason...what cons will i see going to a heimed end on the axle (if any)? I surely know the pros, just never went through a rubber end this fast before, made me think. Thanks all

Finally got my fox 2.0 bumps in..theyre 2" travelers (thanks to some advice from here for sure)

some video of em in action and pictures of the setup...

http://www.youtube.com/watch?v=1GBs6ARfBoE

 

[Ryan93]

well for one, if you lower your axle end mount down you can run a longer shock,
check this thread out for some ideas
http://www.naxja.org/forum/showthread.php?t=989252&highlight=shock

 

[HeavyMetal]

well i know that, not really lookin to run a different/longer shock here though..

 

[XJEEPER]

dig the goprohd vid.
wonder if my motor moves around that much at speed, what motor mounts are your runnning?

 

[Cache96]

do you have any pics on how you mounted the bump stops?

 

[DieselSJ]

Now it is time to start reinforcing that fenderwell area before it starts tearing itself apart. It is only a matter of time now before that spring bucket starts to collapse. Nice work though!

 

[HeavyMetal]

dig the goprohd vid.
wonder if my motor moves around that much at speed, what motor mounts are your runnning?

stock ones, one is worn out, the other is good...i gotta replace it for sure

do you have any pics on how you mounted the bump stops?

well theres the ones posted above...

then these:

i have a UHMW rod i used as the bump pad. the bumps are kept in from falling out with 2 set screws

Now it is time to start reinforcing that fenderwell area before it starts tearing itself apart. It is only a matter of time now before that spring bucket starts to collapse. Nice work though!

already have full body length front, middle, and rear stiffeners going in in the next week :greensmok

 

[GrimmJeeper]

frame stiffeners will do nothing to keep the fenderwell from collapsing. mine is pushed in so far i could barely get the airbox out. you need to brace it from the back side to keep teh top of that pad you welded in from pulling the whole inner fender area around it from being pushed up and inwards every time your bump stops collapse.

this is how bad mine have gotten:

 

[xcm]

awesome! thanks for postin the vid.

the heim joints for the front will only do good things. the rubber your running now, while easy to mount, try to do some of the shocks work at the bushing. replacing them with heims will make the shock itself do 100% of the work, only using the heim for misalignment angles. i think you can replace the shock end with a heim version??

do you have a heim top mount? looks like youve got a weird fitment. i have 'oem' front fitment with those same rubber lowers, but i have a stem top mount...

 

[HeavyMetal]

awesome! thanks for postin the vid.

the heim joints for the front will only do good things. the rubber your running now, while easy to mount, try to do some of the shocks work at the bushing. replacing them with heims will make the shock itself do 100% of the work, only using the heim for misalignment angles. i think you can replace the shock end with a heim version??

do you have a heim top mount? looks like youve got a weird fitment. i have 'oem' front fitment with those same rubber lowers, but i have a stem top mount...

i have a rubber top mount as well (just in a stem converter) ..i think ill be going heims at the bottom though for sure, thanks for the input!

anyone have any thoughts on this video below? my back end is kicking up a bit when i air it out, whether that be due to the fact i run out of uptravel back there, or because my shocks have such a high rebound valving (theyre valved 20/90), im unsure what would be a greater contributing factor there.

here is the video:

http://www.youtube.com/watch?v=CGm22juoUBE

 

[silverslk]

Do you have that video without the slow motion? It's hard to hear the engine and see if there are other contributing factors to the rear.

It doesn't look horrible........I don't know how they do their valving numbers but high rebound is usually more resistance not more pressure (make sense?). So more rebound damping would cause a slower extension of the shock.

 

[HeavyMetal]

Do you have that video without the slow motion? It's hard to hear the engine and see if there are other contributing factors to the rear.

It doesn't look horrible........I don't know how they do their valving numbers but high rebound is usually more resistance not more pressure (make sense?). So more rebound damping would cause a slower extension of the shock.

i do, here it is in normal speed

http://www.youtube.com/watch?v=WGyYQxIZ39s

it has to process to be HD, probably a few mins from now itll reach full quality

 

[vetteboy]

You're on the bumpstops when it takes off. No amount of damping is gonna help at that point.

If anything, I'd maybe add a little compression valving at first to try and absorb a little more energy before it bottoms out. High rebound valving makes the rear drop out slower so I think what you're seeing is a byproduct of it bottoming out and launching rather than springing back and pogo'ing. Once it lands and settles it looks like the rebound valving is right there to take care of the big hit...in a way you'd want a trail rig or street car set up. I think if you were to take it through a few sequential whoops you'd find the rear was 'packing' and not dropping out fast enough.

Rebound valving in the rear is tricky - you want it to drop out fast enough for the next bump, but slow enough that it absorbs the energy from the springs to prevent your ass from going over. It's really something you have to tune on the terrain you want to run.

 

[vetteboy]

-duplicate post-

 

[HeavyMetal]

Sounds good, makes sense, thanks chris.

I think for what the jeep is, i will leave it this way...itll always be a crawler/trail rider first...if anything the airbumps made a HUGE improvement otherwise...i just wanted to be able to do a decent speed and have control...airing it out isnt on my huge list of wants anyway haha

i was thinking about going 40/60 in the shocks...a trip to rausch will gimme a better idea next weekend/RCQ weekend

 

[dirtbagXJ2103]

motor mounts

 

[HeavyMetal]

motor mounts

Thank you for this extremely helpful post :greensmok

Definitely key.

 

[vetteboy]

Are your bump tubes 2.5" OD?

I wanted a little more height for a few racing events, I ended up getting some two-piece shaft collars with a 2.5" OD and clamping them around the bump tube as an adjustable coil spacer sort of thing...you can kind of see them here:

I've got no use for 'em anymore...if they'll fit your rig and you want to try them just to mess around with, let me know and I'll bring 'em to the RCQ.

 

[HeavyMetal]

i believe 2-3/8 is the OD...very close. probably not usable then?

 

[vetteboy]

Probably not, but maybe with a little bit of grinding on the flats where the bolts go through?

You're welcome to try 'em at any rate, right now they're just helping to weigh down my toolbox.