long travel shocks, who makes em (13"+travel)

Chris_Keziah said:
Partially from the generic driveway flex test
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as retarted as this may sound, if you only knew how many times I flexed my rig out on stumps and all kinds of stuff in my yard to study my suspension, figure out weak points and binding and whatnot...past 6 months I've redone my rear spring hangers twice, my limiting chains twice, and shock mounts twice to get to where it flexes now with no issues but I'm maxed out till I can get longer shocks/coilovers whatever comes. I have a 46" stump and a 54" stump in my yard currently that makes great ramp...neighbors get a kick out of it, especially now that I'm a little higher in lift as of yesterday (went from 3" up to 5.5"ish), it got tipsy on top of the 54" stump since now it carries tire, before it didn't. I swear I could've pushed it over on it's side if I tried hard enough. Makes good neighborly chit chat and beer talk lol
 
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this is what @Van-go is talking about, I've thought of and done some ghetto fabulous stuff but dang, I've not once thought of this. LMAO
 
marty79 said:
holy shishkabobs bro, LMBO. I came across a picture of what you're talking about and wow, can't believe someone actually did it...so you're saying that actually works. I mean I know I'm ghetto, and my rig is pretty much all ghetto but I really didn't want to go "that" ghetto LOL but jokes aside, you're saying it works? let me guess, you could have "dual rate" too!!!! :lol::lol::lol::lol::lol::lol:
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No, it doesn't work, and (just for giggles) I'll tell you why: Assuming the shocks are the same (or roughly the same), the shaft velocity goes down by a factor of two, so your damping curve is completely wrong. You would need shocks that have twice the damping that you need for a given shaft velocity, because it will be divided in half. That assumes you can keep the velocity matched between both shocks too, which wouldn't actually happen in the real world without some extra gizmos. If the shocks aren't the same, shit becomes a lot worse. None of that matters though, because you're not actually going to do that.
Now that's enough of that, I have a beer to finish.
 
Fabrik8 said:
Assuming the shocks are roughly the same,
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well just for giggles, wouldn't you want the shocks to be different rates like in coilovers? stiffer shock on bottom, softer and shorter up top would be the ideal IF you were to attempt to build a contraption like that? obviously 2 shocks of the same wouldn't be the smart choice but a heavy hydro shock on bottom and light gas charged up top would appear to "make it work" lol...I'm still sticking with finding some 16" regular shocks but I've not had good luck yet..true 14s is all I can find, but all 4 of my shocks are band new and not spending another 160 just to go from 13.25 to 14", not worth it.
 
marty79 said:
bootiefab_shocks-jpg.1077786

this is what @Van-go is talking about, I've thought of and done some ghetto fabulous stuff but dang, I've not once thought of this. LMAO
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Not quite what I’m saying... lol you gotta weld the gas containers together. Like this. Makes it more compact. And yes you get dual shock rates. For those hard hits run your super duty shocks, and for Baja stuff weld some softer ones to the super duty.
 

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marty79 said:
well just for giggles, wouldn't you want the shocks to be different rates like in coilovers? stiffer shock on bottom, softer and shorter up top would be the ideal IF you were to attempt to build a contraption like that? obviously 2 shocks of the same wouldn't be the smart choice but a heavy hydro shock on bottom and light gas charged up top would appear to "make it work" lol...I'm still sticking with finding some 16" regular shocks but I've not had good luck yet..true 14s is all I can find, but all 4 of my shocks are band new and not spending another 160 just to go from 13.25 to 14", not worth it.
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This would work fine, but you'd need springs or something to help the shaft return to some steady-state position (home position) with a spring perch welded in the middle of the shaft somewhere. The shaft would be floating between two different dampers, so you need something to control the motion of the shaft so it doesn't move to the end of one shock (and stay there until pulled out by a lot of travel) if they're mismatched (that's one of the gizmos I was referring to). That's just the beginning, to solve a minor mechanical problem.

If you mix springs like you're talking about for coilovers, you have a combination of the two spring rates, but each spring has a force that's based on displacement. Pretty straightforward.

But with shocks, you have a damping force that's based on velocity, and displacement, and direction, and then (if the two shocks are different) the shaft velocity into one shock will be changed by the damping force from the other shock. That would lead to fun things; the shock with more damping for a given velocity would exert more damping force on the shaft, which then increases velocity into the shaft with less damping force, which then increases the damping force from that shock because of the higher velocity, which then affects the first shock because it's shaft velocity is now lower. So you could end up with some really interesting S-shaped response curves or other weird ass non-linear shapes. You're starting with two things, each with a different non-linear force vs velocity response, connecting them together, and then letting the force and velocity from one of them affect the force and velocity of the other one.

It's fun to think about, but no.
 
Fabrik8 said:
But with shocks, you have a damping force that's based on velocity, and displacement, and direction, and then (if the two shocks are different) the shaft velocity into one shock will be changed by the damping force from the other shock. That would lead to fun things; the shock with more damping for a given velocity would exert more damping force on the shaft, which then increases velocity into the shaft with less damping force, which then increases the damping force from that shock because of the higher velocity, which then affects the first shock because it's shaft velocity is now lower. So you could end up with some really interesting S-shaped response curves or other weird ass non-linear shit. You're starting with two things, each with a different non-linear force vs velocity response, connecting them together, and then letting the force and velocity from one of them affect the force and velocity of the other one.
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Wow I actually understood all this, good tech. Thanks for the great clarity.
Van-go said:
Like this. Makes it more compact. And yes you get dual shock rates. For those hard hits run your super duty shocks, and for Baja stuff weld some softer ones to the super duty.
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Well dang, that's not as bad lol, now I see why you said still compact lol, my picture I was like "this ain't very compact, lol that's long as hell" lmbo
 
Van-go said:
Baja stuff weld some softer
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...bro there ain't no baha driving in my pile of metal lol my top speed is like 12mph in OD :D:driver::rockon::beer:
 
So yeah I made my own 19" travel shocks for the rear, work awesome all day today on its test run, fronts are maxing out with 13.75" travel shocks, 6" lift now (previous 3") and well I'm pretty impressed. It's ready for some real wheeling now. Front left tire on that hill is 7ft off ground, second time I tried it made up on the ledge and about lsyed it over lol. That foundation wall is 57" off the ground so I'm pretty happy with that all tires are planted still at my height.
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Hell yeah...now show us the shocks
 
No way I was welding shock bodies together so I did it that way since I have the room. Works great so far
 
Van-go said:
Weld two short travel shock bodies together. One upside down of course. That way to have the shaft on top and bottom. Then you can pack a lot of travel in a tight space.
seriously though. Post up in the wanted section for some 14in shocks. I’ve gotten a few sets for cheap over the years used. Good luck buddy

edit: I think I have some 14 inch rough country shocks you can have if you want them
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You did it.. You silly sonbitch you really did it. Well done.
 
braxton357 said:
You did it.. You silly sonbitch you really did it. Well done.
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Did anyone expect him NOT to do it? I'm not surprised by this at all :D
 
jeepinmatt said:
Did anyone expect him NOT to do it? I'm not surprised by this at all :D
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Good point, lol. I mean it's me after all, ghetto fabulousness is my jam!! But honestly if it works it works, why not. Just like my doubler setup, it's weird, ghetto but dang it gets the job done perfectly and reliably too so no complaints here. I love my rig, $2300 of scrap metal and it's a pretty bad ass crawler! Now that's a real deal budget lol
 
Mac5005 said:
Is it too late to say just put the shocks on the links?
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Dang it now you speak up lol, no it's not too late, I'll run this for a little but now you gave me the backup plan lol:beer:
 
Mac5005 said:
Is it too late to say just put the shocks on the links?
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Plus I'm sure many were thinking "let's see what contraption he comes up with" :lol::lol:
 
Fabrik8 said:
Well, he just cut his damping by a factor of two, so that may be a good plan.


If you cut the velocity in half, and everything is still gravy, damping probably doesn't matter at this point... :p
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it actually rides better than ever for what it's worth lol, maybe doesn't say much since it's a cobbled together budget build, lol, but nonetheless it rides well compared to before so that's gotta account for something. Yesterday was the first time since i built it that I could drive it a descent speed over bumps and through the woods without it beating me all to hell lol
 
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