Shackle moves sideways alot. How much PSI in bump stop

[Alan2smiley]

88 GMC CC On a rough paved road. Is this normal? 52" ORD springs with poly bushing with about 3500 miles on them.

 

[Alan2smiley]

Mounted a camera today.

 

[Fastereddie]

Id say looks as I would expect. Especially with a big 'ol heavy cummins above it. Guess you'll just have to link and coil over it.

Super jelly of your bumpstops btw.

 

[nvrenuf]

I agree, it looked like I expected. Maybe install a (restrictive) panhard bar?

 

[blazinzuk]

I'd say normal

 

[Blazooki]

new bushings in the top shackle hole also? either way I would throw a FUSH kit on it and get the benefit of a larger bushing up top.

http://www.offroaddesign.com/catalog/FUSH.htm

 

[Alan2smiley]

When I started the build links were kinda unheard of and kits we're not available. If I had to do it again I would definitely link it. I haven't hit any hard bumps yet and the stops bottom out pretty easy with 40 PSI. Its a 700lb 4BT, I was going to try 80 PSI. sound about right?

 

[Alan2smiley]

Yes I have the DIY upper kit, poly slide-spacers between shackle and frame are probably unheard of ?

 

[jekquistk5]

Most the go fast guys run about 150... Usually people start at 200 and work their way down.

 

[Alan2smiley]

Most the go fast guys run about 150... Usually people start at 200 and work their way down.

I can only try to go fast and since it's little heavier I start with 200psi. Thanks

 

[diesel4me]

It does seem to flex side to side quite a bit--but who knows if that's "normal",it is only recently we have the ability to watch & record things like this...
If the shackles are longer than stock they will flex more-I am kind of surprised they are not "H" shaped with a tie bar across both plates,that would help keep them from flexing as easily..

 

[Alan2smiley]

Hydro assist would probably inpove it some.

 

[Chevy305]

Does it handle weird at all? Wandering and such?

P.S. Love the sound of that 4bt

 

[Blazooki]

It does seem to flex side to side quite a bit--but who knows if that's "normal",it is only recently we have the ability to watch & record things like this...
If the shackles are longer than stock they will flex more-I am kind of surprised they are not "H" shaped with a tie bar across both plates,that would help keep them from flexing as easily..

you can't H the front shackles cause the shackle moves so far up along the frame when the spring flexes that any tie bar would hit the bottom of the frame way before the spring was compressed. You can however get H shackles for the rear and they work very well. longer shackles also get into the front body mount. (you can see how Alans already had to cut his a bit)

I had "L" shaped shackles on my old school front with 52s. That let the shackle go around the body mount when it compressed. If you made a set of "L" shaped shackles then you could cross brace the front portion of the L...I did a CAD drawing to help explain.

 

[Alan2smiley]

Does it handle weird at all? Wandering and such?

P.S. Love the sound of that 4bt

Now that I have seen the video it's little sloppy. I have a idea that should help, will post pictures when it's done.

 

[Alan2smiley]

Springs are flat so they shouldn't travel back anymore.

 

[Fastereddie]

Test drive yet?

 

[Alan2smiley]

Test drive yet?

Yeah it's better but room for inprovement. I think hydro assist and maybe solid bushings on top it should drive like a Maserati. Can see were the bolt was hitting the shackle.

 

[Fastereddie]

I'm afraid to video what my supension is doing....