Placement of bumpstops

[dangerdog]

When setting bumpstop placement on a four link you make them bottom before the coilovers during verticle travel. But during articulation the coilovers bottom just as the bumpstops make contact. I see alot of bumpstops inboard compared to the coilover which in turn will make this happen. I am thinking that the more in line left to right with the coilover the better they will work together.

 

[badmix]

I dont know the correct answer, but I would want the bumpstops to hit 1/2 - 1" before shock bottoms out.

 

[ktmoutfront]

Mine are about 3 inches inboard of the shocks. I have never felt them bottom out. I set it up with 1/2" to bottom out at level stuff.

 

[Deuling]

When setting bumpstop placement on a four link you make them bottom before the coilovers during verticle travel. But during articulation the coilovers bottom just as the bumpstops make contact. I see alot of bumpstops inboard compared to the coilover which in turn will make this happen. I am thinking that the more in line left to right with the coilover the better they will work together.

You are correct. In a perfect world the bumps would be just in front or behind the shock mount, to allow them to bottom out correctly in every situation.

But in a flexing situation, i don't see it as a big concern. Set limit straps well and don't hammer through articulation obstacles. Static travel has always seemed more necessary to use the full bump stop travel in my mind.

 

[muddysub]

You are correct. In a perfect world the bumps would be just in front or behind the shock mount, to allow them to bottom out correctly in every situation.

But in a flexing situation, i don't see it as a big concern. Set limit straps well and don't hammer through articulation obstacles. Static travel has always seemed more necessary to use the full bump stop travel in my mind.

agreed! the only time I've felt my truck bottom out is at higher speeds on dirt roads where the whole axle is traveling up rather than articulating.

 

[dangerdog]

You are correct. In a perfect world the bumps would be just in front or behind the shock mount, to allow them to bottom out correctly in every situation.

But in a flexing situation, i don't see it as a big concern. Set limit straps well and don't hammer through articulation obstacles. Static travel has always seemed more necessary to use the full bump stop travel in my mind.

Yes but what if you hit off camber on the non articulation stuff? There goes a coilover.

 

[dangerdog]

Mine are about 3 inches inboard of the shocks. I have never felt them bottom out. I set it up with 1/2" to bottom out at level stuff.


View attachment 171669

Yes I looked at your placement. Mine are about that. Had not actually measured.

 

[Deuling]

Yes but what if you hit off camber on the non articulation stuff? There goes a coilover.

Imo leave some extra travel in the shock when the bump is bottomed out. And in those off camber situations hopefully your compression valving in the shocks slow the thing down fast enough to prevent real damage. If not then yes you get to go spend money.

Listen to Ktmoutfronts advice. His has been used and abused over a decade and he hasn't replaced shocks.

 

[miniwally]

I can bend a 5/8" Grade 8 bolt with my bypasses just from shock forces alone.

Bottoming out a 2 1/2" dia coilover in articulation isn't going to kill it. Look at it this way, the coilover is a piece of 2 1/2" .120 wall tubing. You build your rig out of smaller tubing than that.

The above is all correct with placement left to right, I like to see at least 1/2" of clearance now on a shock at full bump, pads wear, things bend etc.

I only hate bottoming things out because it hurts me, I don't worry about coilovers or shocks in those instances only my dentures.

 

[dangerdog]

I can bend a 5/8" Grade 8 bolt with my bypasses just from shock forces alone.

Bottoming out a 2 1/2" dia coilover in articulation isn't going to kill it. Look at it this way, the coilover is a piece of 2 1/2" .120 wall tubing. You build your rig out of smaller tubing than that.

The above is all correct with placement left to right, I like to see at least 1/2" of clearance now on a shock at full bump, pads wear, things bend etc.

I only hate bottoming things out because it hurts me, I don't worry about coilovers or shocks in those instances only my dentures.

Thanks for the replys. I think I may try to outboard them some. Will have to move them forward as they will contact the coilover on the droop side if I move them out where they are. I assume that you can do more damage on the droop side if your limiters are not correct length.