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And the buggy begins!! (some suspension pics and q's)

T

tealcherokee

NAXJA Forum User
Location
CT
http://www.tehbaron.com/r_images/buggy.jpg

my LCA is in my pumpkin, but thats just for refrence, i just started the cad file, its just for the suspension design basically

im not sure how the front will work, with the straight lowers and triangulated uppers and no panhard

im thinking front coils, rear 1/4 elips, but again, not sure

any advise welcome.... pickin up the axles tmrw, so this is starting soon
 
yeah, as far as bumpsteer, i dont care, its going to be hydrosteer.

im trying to keep the uppers and lowers mounted on the same plane, and its messing things up a little......
 
well its not going to be under a xj really, i mean, narrowed front clip and hood....

my xj has a 3 link w/ pan hard now, its been working really well for me, i just figured if i were dumping the drag link, might as well not have a track bar and have my axle droop straight down, i like the clean look of a 4 link. if im going to take the time to do this right (unlike my xj) i supose i should decide on the front suspension type :\

i want to start on the rear on monday, do you have a link to a decent anti squat calclator, the one i used was coming up with 125%, but i dont know if i beleive it
 
tealcherokee said:
well its not going to be under a xj really, i mean, narrowed front clip and hood....

my xj has a 3 link w/ pan hard now, its been working really well for me, i just figured if i were dumping the drag link, might as well not have a track bar and have my axle droop straight down, i like the clean look of a 4 link. if im going to take the time to do this right (unlike my xj) i supose i should decide on the front suspension type :\

i want to start on the rear on monday, do you have a link to a decent anti squat calclator, the one i used was coming up with 125%, but i dont know if i beleive it
Click to expand...
the 4 link calculator in Triaged's sig on Pirate is great. it will be hard to get an accurate number when you don't have an accurate CG number yet. I've heard many people very pleased with the results of using uppers 75% the length of the lowers, and verticle seperation 75% as much on the frame as on the axle, and keep the links as long and flat as reasonable.
 
Track bars work great. Nothing wrong with triangulated suspensions, and there's nothing wrong with track bars. Go for the performance you want, or work with the amount of room you have, and make sure whatever you use is designed well.

Have fun with the project,
 
How much vertical separation do you need on a dual triangulated 4 link rear?
I know it's something like the 75% that Brettm said but how do I work all that out when I dont have a frame? COG will be the same as an 4.0/aw4/231 XJ with 4" of lift, thats what 32" or so?
I have a clean slate MJ cab and no rear frame rails, so the sky is the limit with a 105" wb.

I have spent many hours searching with results that have frames or 2.5 ton axles...Thanks andy
 
Last edited:
what axles are you running now? no more spooled 44's?

even if you narrow the front clip and stuff won't the oil pan and exhaust still get in the way? i saw pics of a triangulated upper and straight lowers with a mildy modded exhaust, for some reason i think he ran the tj down tube that comes forward and wraps around, but there was still too much bumpsteer, so he had to add a trackbar. it would seem as though it would be possible if you modded the oil pan. defenitely keep us updated!!! and for the record i am way out of my league when talking about this stuff so feel free to correct me at any point, i am willing to learn and can handle sarcasm!!!!


Mike


btw ryan this is justin's friend mike, greetings....
 
well, this was originally going to be a tube frame buggy, but now im just going to build the xj some more.....

i still have the spooled 44's soon to be spooled something bigger either 44/60 or 60/60 on 38's or so

either way, by keeping the vertical seperation 0 (all the mounts on the same horizonal axis) ill never come close to the oil pan, or exhaust...
 
tealcherokee said:
either way, by keeping the vertical seperation 0 (all the mounts on the same horizonal axis) ill never come close to the oil pan, or exhaust...
Click to expand...

Just to reiterate, If you took a 4 foot solid rod and drilled straight throung both framerails, then all links would mount on the line of this rod? (this is all in theory; not withstanding drivetrain interference. just trying to make sure i understand you)

If that is the case:

That should net you Crazy high anti-squat numbers.

And I believe if it were a triangulated four link you'd have significant binding issues as well.

Brett M or one of the other Link gurus back me up here????
 
tealcherokee said:
well, this was originally going to be a tube frame buggy, but now im just going to build the xj some more.....

i still have the spooled 44's soon to be spooled something bigger either 44/60 or 60/60 on 38's or so

either way, by keeping the vertical seperation 0 (all the mounts on the same horizonal axis) ill never come close to the oil pan, or exhaust...
Click to expand...

I don't think you'll ever be happy with your suspension either. Why go through the extra effort of a custom suspension if you're not at least going to "try" to engineer it to some degree? What does the stock suspension setup not do that you're trying to overcome with the new suspension? The stock front link & rear leaf combo sounds like a better performing & easier way to go than what you're proposing. I guess the real question is, "What are your goals for this rig?"

Matt
 
Have you run any numbers yet? Your anti-dive will be a problem with the uppers in the same plane. A 4 link can fit, but it's really tight.

Axle.sized.jpg


Pass_Frame.sized.jpg


Flop.sized.jpg


-Jon
 
tealcherokee said:
well puttin them on the same plane gets me antisquat values of about 120% antisquat
Click to expand...

Deffinitely not questioning you, but what values are you using to arrive at that? I can't manipulate numbers to get lower than 190% anti dive with all links converging at the same horizonttal plane.
 
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