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Old 02-11-2010, 02:47 PM   #1 (permalink)
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Air bumps. Inboard or Outboard

I see a ton of builds with the bumps mounted less than 12" apart, and the more I think about it, as I'm setting up the plans for mine, I'd think they would be better off farther outboard than the coilovers. I realize at slow speeds, that it shouldn't be an issue, but hitting something at a decent speed twisted up, or with a heavy rig flexing against the coilovers bottoming out, most of these rigs aren't touching the airbumps unless it is a straight jump.

With a heavy rig, and a heavier foot, would I not be better off figuring out how to mount my airbumps virtually against the knuckle?
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Old 02-11-2010, 02:53 PM   #2 (permalink)
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I have wondered about this as well. I see some rigs that when fully articulated the CO will bottom out long before the bump even gets touched. If you bottom out the CO from a jump and land fully articulated the bump will probably be the last thing on your mind at that point.

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Old 02-11-2010, 05:16 PM   #3 (permalink)
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I think it's done because often there are more limits to uptravel in the center. With more room for the tire to go up on each side during single wheel "flex" than just full on whole axle bump. Keeping them in alows the axle to articulate farther than the bumpstop would limit the travel to....this does require it to be setup with some shock still available when you are sitting on the air bumps though. A little scary in that a hard enough landing on just 1 tire might miss the bumps altogether and transfer the force only into the shock as it bottoms out. That's why I didn't go too far in with my bumps.

I've wondered it also though. Be interesting to see others takes and reasoning. I set mine up like stated above. Sitting on the airbumps there's still an 1 1/2" or so of shaft showing. But I use all the shock uptravel on articulation. Don't know how it works yet though....stupid $%#$%%$$#^$^ rig
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Old 02-11-2010, 05:24 PM   #4 (permalink)
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So what about using one in the middle, dead center, and 2 outboarded?
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Old 02-11-2010, 05:30 PM   #5 (permalink)
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So what about using one in the middle, dead center, and 2 outboarded?

That's kinda neat. 1 center then 2 outboard at a different a height to allow the uptravel on articulation? hmmmmm.....only thing is body roll when coming down anything less than perfectly straight on the single center (it might pich you over to the side you are already leaning towards) plus the added costs...top of my head thoughts anyway.
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Old 02-11-2010, 05:59 PM   #6 (permalink)
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You guys are way over thinking it.

What do you want the bump stop to do? For crawling I'd put them inboard of the lower shock mounts so they dont come into play much while crawling but when the axle is moving up and down while going fast they will control it as needed. Put them too far in and you lose effectiveness if the axle isnt perfectly square going up and down.Put them as far apart as you can realistically get them without limiting your low speed suspension travel too much.

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Old 02-11-2010, 06:12 PM   #7 (permalink)
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QUOTE=95geo;11014791]You guys are way over thinking it.

What do you want the bump stop to do? For crawling I'd put them inboard of the lower shock mounts so they dont come into play much while crawling but when the axle is moving up and down while going fast they will control it as needed. Put them too far in and you lose effectiveness if the axle isnt perfectly square going up and down.Put them as far apart as you can realistically get them without limiting your low speed suspension travel too much.

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Thought that's what I said in my first pos, maybe not in the exact same way I guess. But it's what I was getting at [

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Old 02-18-2010, 03:50 PM   #8 (permalink)
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Any input from the guys that where KOH?
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Old 02-18-2010, 04:01 PM   #9 (permalink)
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You want them as far out as you can get them but not outside the coilovers.
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Old 02-18-2010, 05:51 PM   #10 (permalink)
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Right on the outside of the "frame" is a good spot. You don't want them hanging too far off because of how much load goes through them. Be sure you still have some bump travel left in the shocks once the air-bumps are bottomed.
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Old 02-18-2010, 06:32 PM   #11 (permalink)
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I mounted mine outboard of my coilovers. My uptravel is limited by my tire to tube clearance and I wanted to do everything I could to protect my little Toyota axles from bending. For my clearance issues (tire to chassis not axle to frame) mounting the bumps outboard/even with the coilovers actually maximized my up uptravel and articulation travel. On a rig that the up travel is limited by clearance issues at/between the frame you would be better off mouting the bumps further inboard
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Old 02-18-2010, 06:35 PM   #12 (permalink)
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here is my setup. criteque if you have ideas.
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Old 11-27-2012, 10:36 AM   #13 (permalink)
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here is my setup. criteque if you have ideas.
A rear drive shaft would be a starting point.

On a side note. Mine (just got some ordered from profender) are going in the rear.

My rear suspension articulates way before my front, but the rates are just about right so I am outboarding them.

If I outboard them then the rear suspension will have to deal with them when it articulates and the front will start to move more and balance the whole thing out.

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Old 11-27-2012, 10:44 AM   #14 (permalink)
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def going to see what everyone is doing with these as i need to makeup my mind where they are going on my truck.
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Old 11-27-2012, 11:01 AM   #15 (permalink)
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I would do outboard or even with shocks so they hit at same time in vertical travel or flex travel.
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Old 11-27-2012, 11:36 AM   #16 (permalink)
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Mine are chassis width, to control bottoming when hitting jumps etc, and they are set up to bottom out with the shock showing 3" of shaft at full compression (18" coilover). I am then running a 3" TJ bumpstop on the shock shaft itself. This way I get bottoming protection for jumping, as well as slow crawling.
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Old 11-27-2012, 11:45 AM   #17 (permalink)
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A rear drive shaft would be a starting point.

On a side note. Mine (just got some ordered from profender) are going in the rear.

My rear suspension articulates way before my front, but the rates are just about right so I am outboarding them.

If I outboard them then the rear suspension will have to deal with them when it articulates and the front will start to move more and balance the whole thing out.
Responding to a nearly 3 year old thread is almost as retarded as your comment
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Old 11-27-2012, 11:47 AM   #18 (permalink)
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Mine are set even with the shocks and hit the links, they make contact during straight uptravel and slight articulation but clear and don't hit at all during extreme flex. This works great to soften the hits during go fast and not limit flex while crawling.
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Old 11-27-2012, 11:50 AM   #19 (permalink)
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On pure articulation, why would you want the air bump to hit at all?
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Old 11-27-2012, 12:23 PM   #20 (permalink)
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I had mine slightly inboard...set it up so everything would just about max out at the same time when articulated, and leave about 1" showing on the shock shaft at full bump.

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Old 11-27-2012, 12:59 PM   #21 (permalink)
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an ideal setup is mounting them just far enough from center of the axle to where they are just about to touch the bump pad at full articulation. unless you have no choice due to space or setup, its not ideal to be working your bumps from articulation, it momentarily interferes with the design/tuning/spring rate of the coilover.

they are their for hard uptravel hits.

even a non high end coilover is designed to support a rigs weight from articulation. and i would think its almost impossible to get a hard enough hit to where it articulates your axle so much to where it rips your shock off.

heres an example of my rear being setup how i described. this is almost full articulation. 3" bumps. and not that you can see it in the pic but if i were to be at full bump i would still have just slightly over an inch of shock shaft showing.


edit just realized this thread is 3 years old . FML
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Old 11-27-2012, 11:12 PM   #22 (permalink)
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Responding to a nearly 3 year old thread is almost as retarded as your comment
You're right, we should start new threads anytime we someone wants to discuss the same shit over again.

I didn't read the date cause I used the search function and found what I wanted so go fuck yourself.

My bad on making a joke to a three year old post; I will still sleep fine tonight.
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