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Unread 11-07-2015, 03:34 PM   #1
79cj7amc304auto
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Reduce Bumpstops or no?

Has anyone cut their fenders flat and reduced their factory bump stop for stock Rubi M/T 32's? Looking for some temporary added flex. I plan on running 35's as soon as I blow a tire, but till then are there any cons to doing this? Will the coils over compress or will the shocks bottom out? I'd like to know if anyone busted anything before I become a Guinea pig.

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Unread 11-07-2015, 03:38 PM   #2
79cj7amc304auto
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I just cut my fenders and there's a ton more room in the fender well so I'm thinking... Why not?
image-4227113038.jpg

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Unread 11-07-2015, 05:31 PM   #3
Maertz
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Youll need to measure to be sure. Id bet you can remove some and gain some travel as most kits limit as they are sold by lift height not fenders and tire size and such. At full bump see how much shock you have showing and how far your tires can go before getting into anything. Coils should be fine but you can also see at your current fill bump.
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Unread 11-07-2015, 07:38 PM   #4
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You can't remove much because your shocks will become your new limiting factor. You can cut all you want, but your still limited by your shock.

You would pick up more travel by replacing your factory 8.5"+- travel shocks with a set of 9.5"-11" travel shocks and adding maybe 1"+- of bump stop.

Bump stops are set pretty tight from the factory for the stock suspension component clearance.

I'm all for limiting bump stop to increase travel but you need to get into a shock with a little more stroke first.

You plan on going to 35's anyhow, so cutting the factory bump stops down is a step in the wrong direction.
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Unread 11-07-2015, 07:47 PM   #5
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No, that crushes about flat if you ever flexed it that hard like in a cross flex or high wheeling up a wall or huge rock.
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Unread 11-07-2015, 08:53 PM   #6
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The jounce bumper doesn't really factor into determining full bump. You can remove it, but there really isn't any travel gained. Full bump is metal on metal. Removing the jounce bumper will just set you up for a harder hit if you do hit full bump.

To reduce the factory bump stop, you would have to remove the jounce bumper and cut the metal cup down that the jounce bumper slides into.
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Unread 11-07-2015, 09:29 PM   #7
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I used to run 3" bumpstops all around with 37's, and Fox 2.0 Shocks (with the RK 2.5" /3.5" on a 2-door) and flat fenders.

After flexing it many times, I realized that I did not need that much.

Now I am using Rancho 9000XL's and reduced the bumpstops to 2". Seems perfect to me.

Point it is, flex it to the limits, get out and take a look. That is the simplest way to determine how much bumpstop you need.

BTW, to save some $$$, use hockey pucks and a long bolt (available at your local hardware store) instead of pre-fabbed bumpstops. You can always remove/add a hockey puck to adjust your bumpstops. Total cost: about $20.
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Unread 11-08-2015, 07:18 AM   #8
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Originally Posted by SLADE View Post
You would pick up more travel by replacing your factory 8.5"+- travel shocks with a set of 9.5"-11" travel shocks and adding maybe 1"+- of bump stop.
How does adding bump stop increase travel?
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Unread 11-08-2015, 07:24 AM   #9
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Originally Posted by sportcoupe View Post

How does adding bump stop increase travel?
It acts as a fulcrum causing the opposite side to droop more. This is as my experience in my xj.
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Unread 11-08-2015, 07:54 AM   #10
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It acts as a fulcrum causing the opposite side to droop more. This is as my experience in my xj.
Oh, so what it's really doing is shifting the percentage of up and down travel. Adding bump stop reduces up travel but increases down travel. The amount of actual travel is probably the same?
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Unread 11-08-2015, 07:55 AM   #11
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Originally Posted by sportcoupe View Post
How does adding bump stop increase travel?
An 8.5" travel shock has 8.5" of travel.
A 10" travel shock has 10" of travel.

The 10" travel shock has 1.5" more travel, so travel will be increased.


Your increasing the shock stroke, but to run the longer shock you may have to extend the bump stop slightly. It takes some thought and choosing your shocks accordingly.

The stock shocks have a little room left at full bump, so depending on the shock you choose you may not have to extend the bump stop I just said 1"+- to make note that bump stops may need extended.

running the longer stroke shock also allows the stuffed tire to travel upward farther because of the fulcrum that Luke95 mentioned. You dont have to extend the bump stop to increase the amount the axle will pivot on a bump stop, you just have to extend the shock stroke.
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Unread 11-08-2015, 08:30 AM   #12
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Its hard to say, you need to measure. Id bet you could easily get a 10 shock and not add bump stop but you need to measure. I had 35s and a 12" shock before with 2.5 bump if i recall and i cut fenders. When getting a longer shock make sure it doesnt allow your coil to fall out
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Unread 11-08-2015, 08:35 AM   #13
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Quote:
Originally Posted by 79cj7amc304auto
Has anyone cut their fenders flat and reduced their factory bump stop for stock Rubi M/T 32's? Looking for some temporary added flex. I plan on running 35's as soon as I blow a tire, but till then are there any cons to doing this? Will the coils over compress or will the shocks bottom out? I'd like to know if anyone busted anything before I become a Guinea pig.
Not with out cutting and welding. Factory bumps are "ground zero".
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Unread 11-08-2015, 08:44 AM   #14
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Originally Posted by Maertz View Post
Its hard to say, you need to measure. Id bet you could easily get a 10 shock and not add bump stop but you need to measure. I had 35s and a 12" shock before with 2.5 bump if i recall and i cut fenders. When getting a longer shock make sure it doesnt allow your coil to fall out

Im pretty sure also but it's going to depend on the shock. Like you said though, its going to take a tape measure and looking at the shocks collapsed lengths and not just the amount of lift a shock is advertised for.
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Unread 11-08-2015, 08:51 AM   #15
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Originally Posted by ncb View Post
Not with out cutting and welding. Factory bumps are "ground zero".
Yep, exactly.

colouxj made a good thread showing just how tight everything gets at full stuff on factory bump stops.

http://www.jeepforum.com/forum/f96/j...arned-1513528/
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