Bump stops?

[chadschoon]

when puchasing air bump stop how do you figure out what size you need? Do you just fit what you can fit or what? Also when installing them, how early do you want the bump stop to hit the pad?

 

[STAG]

I'd PM Von@BenHanksRacing he could probably help you out... sorry I'm not help, I've never worked with those. I prefer good ol' rubber...

 

[ChestonScout]

It will kind of just depend on where you are going to mount them.

I would get the 4" and just make them work. If you dont need 4" of travel you can bump the pressure up higher so it will be hard to use it. Then if you ever need it you can let pressure out and have some adjustment

4" was perfect for my setup.

Air bumps have to be one of the coolest inventions for offroading IMO. I love them!

What brand are you going with?

 

[chadschoon]

I was thinking of trying out FOA's like yours. How do you go about setting them up? Do you want let's say 1" of coilover shaft still showing when your bump stop is compressed?

 

[spaggyroe]

I was thinking of trying out FOA's like yours. How do you go about setting them up? Do you want let's say 1" of coilover shaft still showing when your bump stop is compressed?

That's pretty much how I'm setting mine up. The beauty of the FOA's is that they have 3 adjustment points (spaced 1" apart). This gives you a lot of leeway.

The thing to keep in mind that they will never be fully compressed. It's hard to determine what the "worst case scenario" is going to be (regarding the force upon the bump stop). This makes it hard to calculate exactly how much compression the bump stop will see at a given pressure.

Somewhere I created a spreadsheet to plot the rate of the FOA's at different pressures. I'll try to find it. It may help with your setup.

 

[ChestonScout]

no real ryhme or reason. Just put some nitrogen in it, try it, if its to soft add more. Kind of just like a air shock.

I set mine at 200 psi. When flexxing at full stuff there was about 3/4" of shaft showing but when both hit at the same time, like a jump or a drop off they would only compress about 2 1/2". They are capable of 350 psi and my pig weighs double what your buggy will so they will be fine.

I would start at 150 psi and go up from there.

The FOAs are such a good product for the money.

One cool added bonus of having mine setup where they were is they acted like a sway bar for me! The Scout handled tons better around corners than it did before.

 

[Crinco]

The one thing I really don't like about mine (Bilstiens) is that they make so much noise on the trail as the buggy moves up and down over the rocks. The Bilstiens have a Aluminum "button" head that you get a metal to metal clunk every time it makes contact with the axle. It get annoying after a while!
Mine can get fully compressed when I flexed out too, it all depends on how you set them up. Make sure you leave plenty of room, the contact point moves inward as the tire on that side goes up, at least it does on mine.
I set mine up so the bumps were close to the axle at first so it acted as a sway bar, keeping the vehicle more level on turns, but that makes for a pretty bumpy ride as your always bouncing off the bumps on smoother trails. On rough trails it limits your travel and doesn't allow your suspension to work soaking up the rough stuff. I have them now set up a little higher, but higher means higher center of gravity. I can't rasie my bumps, I have to raise the buggy to get more gap between the bumps and the axle.

 

[ChestonScout]

The Foa's have a nylon pad for the contact point. I cant hear anything with them

 

[spaggyroe]

The Foa's have a nylon pad for the contact point. I cant hear anything with them

Pic of the bump pad from my build thread.
http://www.rockymountainextreme.com/showpost.php?p=570694&postcount=116

 

[Crinco]

I REALLY wish I could change mine for "softer" ones, such as nylon. I have looked endlessly into some way to quite them down without any luck. It does look like the end might be replacable, but I haven't seen anything about "softer" replacements. The kings have a nylon type end on them too, IIRC.

 

[Corban_White]

I REALLY wish I could change mine for "softer" ones, such as nylon. I have looked endlessly into some way to quite them down without any luck. It does look like the end might be replacable, but I haven't seen anything about "softer" replacements. The kings have a nylon type end on them too, IIRC.

Put some nylon or delrin or other hard plastic on the axle where the bumps hit?

 

[Crinco]

I thought about that, but could not figure out a way to make it "stick". I tryed every type of adhesive that I thought would work but none would stick to the Vinyl after hitting it with my hammer (to simulate the beating it would take by the bumpstop). Any Ideas?

 

[Bucking Bronco]

I don't know if this would be large enough but you might be able to find them in larger sizes but it is just an insert for the bottom of furniture They are strong and have a nylon base and are 1 3/4 diameter.

If you could cut down the stud and attach it to the axle so it would fit flush where the bump stop contacts the axle I would bet it would work.

These ones are for beds and have a 2 1/4 base

I don't know how well the adhesive would hold but you could try a stick these to your axle. These ones are Teflon and come in many different sizes

 

[Corban_White]

I thought about that, but could not figure out a way to make it "stick". I tryed every type of adhesive that I thought would work but none would stick to the Vinyl after hitting it with my hammer (to simulate the beating it would take by the bumpstop). Any Ideas?

Depending on what the pad looks like (pics would help ) countersunk machine screws, helicoil inserts and bolt it on from the bottom, angle iron or c-channel that captures it on the sides, etc.