yj 4 link calc - JeepForum.com
 
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post #1 of 7 Old 09-07-2012, 09:14 AM Thread Starter
Ripper3494
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1994 YJ Wrangler 
 
Join Date: Jan 2010
Location: Warrenville
Posts: 5,741
yj 4 link calc

how do my numbers look? i tried to keep the AS below 100 on full compression since usually on hill climbs your compressing the rear.

any tips would be more than helpful. btw its a 7in rear stretch. my link lengths arent completely accurate since i dont have things torn down at this point and the stretch isnt in place

Attached Thumbnails
yj4link.jpg  

build thread:
http://www.jeepforum.com/forum/f22/9...-spud-1218315/
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
http://www.jeepforum.com/forum/f12/a...te-up-1301614/
my tj 1/2 doors on a yj write up
http://www.jeepforum.com/forum/f12/t...ation-1417686/
RC vs BDS
http://www.jeepforum.com/forum/f12/r...s-bds-1461555/
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post #2 of 7 Old 09-07-2012, 09:37 AM
Imped
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2004 TJ Wrangler 
 
Join Date: Feb 2008
Location: Indianapolis
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If that's @ ride height, those are some steep links......how tall is this thing?

You've got a ton of roll oversteer. You won't like that. You want that to be closer to 0. You'll need to play with the horizontal separation between the uppers and lowers, along with the lengths. My thoughts: Your lowers are too triangulated. That's contributing to the excessive roll oversteer and is also giving you a lower roll center height, which = more pronounced body roll. Flatten them out a bit and get the link lengths closer to equal.

I don't know if it'll help or not, but here's how my rear suspension is setup.

OlllllllO
Float Test Build
IndyORV
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post #3 of 7 Old 09-07-2012, 09:41 AM Thread Starter
Ripper3494
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1994 YJ Wrangler 
 
Join Date: Jan 2010
Location: Warrenville
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thank you, thats a huge help, im just messing with the calc right now to see what comes up. i was actually hoping you would post because ive heard about your setup a few times lol

build thread:
http://www.jeepforum.com/forum/f22/9...-spud-1218315/
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
http://www.jeepforum.com/forum/f12/a...te-up-1301614/
my tj 1/2 doors on a yj write up
http://www.jeepforum.com/forum/f12/t...ation-1417686/
RC vs BDS
http://www.jeepforum.com/forum/f12/r...s-bds-1461555/
Ripper3494 is offline  
post #4 of 7 Old 01-07-2013, 01:34 PM Thread Starter
Ripper3494
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1994 YJ Wrangler 
 
Join Date: Jan 2010
Location: Warrenville
Posts: 5,741
roll axis understeer is pretty low but what do you think?
Attached Thumbnails
my 4 link.JPG  

build thread:
http://www.jeepforum.com/forum/f22/9...-spud-1218315/
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
http://www.jeepforum.com/forum/f12/a...te-up-1301614/
my tj 1/2 doors on a yj write up
http://www.jeepforum.com/forum/f12/t...ation-1417686/
RC vs BDS
http://www.jeepforum.com/forum/f12/r...s-bds-1461555/
Ripper3494 is offline  
post #5 of 7 Old 01-07-2013, 01:41 PM
Bama_WJ
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Join Date: Sep 2007
Location: Owens Cross Roads
Posts: 3,809
You want your roll axis angle to be 0 or as close to 0 as possible.

Take a look at the Suspension Geometry thread.

Daniel
1 Ton WJ Build In Progress

The Daily: 2011 Chevy Cruze Eco - Trifecta tuned and 37+ MPG

Wife's Jeep: 2006 WK Overland - OME HD Lift, 265/70/17 BFG AT's, 1.25" SpiderTrax wheel spacers, 3" Gibson Cat-Back

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post #6 of 7 Old 01-07-2013, 02:34 PM Thread Starter
Ripper3494
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Join Date: Jan 2010
Location: Warrenville
Posts: 5,741
Quote:
Originally Posted by Bama_WJ View Post
You want your roll axis angle to be 0 or as close to 0 as possible.

Take a look at the Suspension Geometry thread.
I'm on my phone right now, what effect will a - roll axis have?

build thread:
http://www.jeepforum.com/forum/f22/9...-spud-1218315/
1994 yj stretched, locked and loaded - 6.0l vortec lq4, 4l60e, np231, Dana 44s 37" interco trxus m/t, 3.5" bds front leafs, double triangulated 4 link rear on xj front coils.
1997 ZJ limited - BONE stock
2003 tj - 4in skyjacker, 33" mickey thompsons
my on board alternator/welder write up
http://www.jeepforum.com/forum/f12/a...te-up-1301614/
my tj 1/2 doors on a yj write up
http://www.jeepforum.com/forum/f12/t...ation-1417686/
RC vs BDS
http://www.jeepforum.com/forum/f12/r...s-bds-1461555/
Ripper3494 is offline  
post #7 of 7 Old 01-07-2013, 03:24 PM
Bama_WJ
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2001 WJ 
 
Join Date: Sep 2007
Location: Owens Cross Roads
Posts: 3,809
Roll axis how a lot on how your axle reacts when its articulated up or down (ie flex steer). That's about all I know.

Daniel
1 Ton WJ Build In Progress

The Daily: 2011 Chevy Cruze Eco - Trifecta tuned and 37+ MPG

Wife's Jeep: 2006 WK Overland - OME HD Lift, 265/70/17 BFG AT's, 1.25" SpiderTrax wheel spacers, 3" Gibson Cat-Back

North Alabama Jeep
42RE Vent Mod - Seal your transmission!
YouTube. - My Video Channel
Facebook - Wheeling Pictures/Videos
The Jeep Wave. Bringing it back.
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