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Old 04-14-2011, 10:30 PM   #1 (permalink)
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Thumbs down Check my 3link numbers

Hey guys, Running through some numbers and from what I see it should work ok.. the only thing I'm a bit unsure of is my roll axis seems a bit high and what issues will result of such a high number not theoretical but actual experience if any.. Thoughts?

Basically my belly height is at 21"and is flat.. my LCAs are frenched so there is nothing to hang up on.. really thats what i was trying to build and work my numbers from there.

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93 YJ 4.0L
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HPD60 front
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Custom 231/D300 doubler
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Old 04-15-2011, 04:43 AM   #2 (permalink)
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There is an awesome thread in the tacoma section about roll axis angle and the effects it has on rig.
https://pirate4x4.com/forum/showthrea...ht=link+census

just from the screen shot it looks like your lowers slope downward quite a bit. with a 21" belly height i'd say your axle end link mounts are too low. Getting your lowers flatter will reduce the roll axis angle.

Other things you can do to help is get your panhard up as high as you can and triangulate the lowers more.

My trucks not done yet so i havn't had a change to drive it but i had to settle for 2.9 degrees over steer because thats all i could package. I'd say 8 is way high for anything that will be driven at speed
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Old 04-15-2011, 10:39 AM   #3 (permalink)
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Agreed- roll axis is way too steep. Ideally it would be slightly negative. If its just a crawler with no road or high speed, that won't matter though.

Your CG is WAY off, which makes your AS way off too. That setup it going to have a lot of AS just by looking at it. Your lowers need to be flatter for this reason, as well as the roll axis issue.
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Last edited by ErikB; 04-15-2011 at 10:40 AM.
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Old 04-15-2011, 10:42 AM   #4 (permalink)
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I'm I seeing that correct you have 260" as your CG height?
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Old 04-15-2011, 11:13 AM   #5 (permalink)
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tks for the input guys.. I must of hit a typo last night for the COG.. (was a late night).. I'll fix it and repost. I'll also post up my rear 4 link numbers to compare..
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93 YJ 4.0L
XJ rears leafs
Waggy fronts
HPD60 front
D60 rear
Custom 231/D300 doubler
cable shifted twin stick
37" Pitbull rockers
work in progress
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Old 04-17-2011, 10:03 PM   #6 (permalink)
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well shit.. I had to put the tub back on the new chassis so I can roll it out tomorrow.. gonna Sas a Libby and put it on 35s.. then I'll bring mine back in.. looks like I might be out for wheeling season this year.. crappy..
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93 YJ 4.0L
XJ rears leafs
Waggy fronts
HPD60 front
D60 rear
Custom 231/D300 doubler
cable shifted twin stick
37" Pitbull rockers
work in progress
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