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Old 07-09-2013, 01:10 PM   #1
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Do I have the correct bumpstop length?

I've been reading and reading trying to do all I can before I leave for deployment in a few weeks but I can't grasp on whether I have enough bumpstop length.

2005 wrangler sport 3" teraflex suspension lift/1.25" BL

Just bought a set of bilstein 5100's Rears are installed, fronts are being shipped in on Thursday.

Rears (bilsteins currently installed):

Attachment 270702

BILSTEIN REAR MEASUREMENT:
Extended: 22.44"
Collapsed: 13.98



Fronts (rancho 5652 installed currently):
Attachment 270703


BILSTEIN FRONT MEASUREMENT:
Extended: 24.00"
Collapsed: 14.88"

Unsure what bumpstop I'm suppose to measure, I was hoping you guys could tell me if I have it right.

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Old 07-09-2013, 01:15 PM   #2
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You want your bumpstop to hit right before your shock bottoms out. Bottoming out shocks...BAD

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Old 07-09-2013, 01:40 PM   #3
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Put the frame up on jack stands. Pull the springs, unbolt the sway bar links, pull the foam bump stops and leave yourself with just the axle, tires and shocks. Jack the axle up straight until the bump stops bottom out. If the upper and lower cups stop hard before the shocks fully compress, before the tire hits anything or anything else hits anything else, your bump stops are at least good enough. If you want to maximize your up travel before your first instance of contact occurs, go for it as long as you're not reaching the limits of travel for any one component.

Also, articulate the axle both directions and verify that the bump stops are the first thing to stop hard there as well. It's really just common sense.....you want the bump stops to be the first things to make contact but you also don't want them to be so long that you're losing out on available up travel. That's it.
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Old 07-09-2013, 02:18 PM   #4
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I don't have access to any of my tools till later but i measured from the top of the bumpstop were it meets the (coil spring isolator?) to the bottom of the cup, fronts was 5 3/4" and the rears were 3"

Does that do any justice?
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Old 07-09-2013, 02:24 PM   #5
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So you have 5 3/4" of space from the bump to the cup. Now you need to know the distance you have before the front shock bottoms out. To maximize, I try to have no more than 1/4" more bumpstop than shock travel.
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Old 07-09-2013, 03:13 PM   #6
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I have almost the exact same problem. Subscribed. Probably just gunna get daystar's extended bump stops.
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Old 07-09-2013, 03:56 PM   #7
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Quote:
Originally Posted by Lotek View Post
Does that do any justice?
there's a thread titled "correct bumpstop length" on this forum. search for it. explains how to do all this stuff.

Quote:
Originally Posted by CountryBoyJeep View Post
Probably just gunna get daystar's extended bump stops.
why don't you just fix the main problem instead of making new ones to compound the issue?
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Old 07-09-2013, 03:59 PM   #8
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The bilstein rear shaft measured 5" I don't have the new bilsteins to measure but it has a collapsed length of 14.88" with 5 3/4" bumpstop length.

The ranchos I have on have 3 1/2" shaft visible.
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Old 07-09-2013, 04:39 PM   #9
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Quote:
Originally Posted by Lotek View Post
The bilstein rear shaft measured 5" I don't have the new bilsteins to measure but it has a collapsed length of 14.88" with 5 3/4" bumpstop length.

The ranchos I have on have 3 1/2" shaft visible.
there are more things to consider than exposed shaft, and your shocks probably bottom out before the entire shaft can go into the shock body.

I would imagine that you will have other things bind before your front bumpstops hit if you have 5 3/4" available uptravel. thats why imped pointed you towards cycling your suspension. you have to look at what hits first. trackbar, tie-rod, drag link, tires, etc. all of this is explained in detail in the thread unlimited04 mentioned. its a good read and will help set up your suspension the right way

the only true way to get your proper bumpstop length is to cycle your suspension. there is no simple answer based on shock lengths. every jeep is different and you have to find out what your limitations are and set up your bump stops accordingly
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Old 07-09-2013, 08:56 PM   #10
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Quote:
Originally Posted by UnlimitedLJ04 View Post

why don't you just fix the main problem instead of making new ones to compound the issue?
How is buying a longer bumpstop then I need compounding the issue? It's just a safer bet in my opinion.
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Old 07-10-2013, 05:55 PM   #11
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Originally Posted by CountryBoyJeep View Post
How is buying a longer bumpstop then I need compounding the issue? It's just a safer bet in my opinion.
those aren't longer bumpstops. they're longer jounce bumpers

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