How much triangulation needed on lowers? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 03-23-2019, 09:33 PM   #1 (permalink)
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How much triangulation needed on lowers?

It's time to fix my rear 4 link with panhard. Currently it's running parallel lowers and slightly triangulated uppers with a panhard. Plan is to fully triangulate the uppers and get rid of the panhard. I won't be able to get much angle on the lowers though. Maybe 10 degrees on each. I'll inboard the brackets on the frame on some outriggers but won't be able to do a full crossmember. Is 10 degrees on each lower with good angle on the uppers still going to give me a ton of rear steer? Lowers are around 44" iirc and uppers will be around 30"

Here's a super old pic showing how bad the rear steer is with the current setup

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Old 03-23-2019, 10:12 PM   #2 (permalink)
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Because you are triangulating the uppers, technically you can run parallel lowers. It will rear steer though. Put what you can in the lowers and run it. Anything is better than nothing.
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Old 03-23-2019, 10:42 PM   #3 (permalink)
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Originally Posted by Beat95YJ View Post
Because you are triangulating the uppers, technically you can run parallel lowers. It will rear steer though. Put what you can in the lowers and run it. Anything is better than nothing.
Yea. I know that much. Don't know how much angle it takes on the lowers to really get the rear steer under control.
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Old 03-24-2019, 03:08 AM   #4 (permalink)
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Yea. I know that much. Don't know how much angle it takes on the lowers to really get the rear steer under control.
Few ways. Widen the arc that the rear wheels have to follow through there droop with longer control arms.
Or, the closer you can get the lower arms together on the frame end, the better.
Then you can do a triangulated (A frame) radias arm setup with panhard bar. Flatter or less angle from frame to axle, the less your steer
Like this.




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Old 03-24-2019, 10:31 AM   #5 (permalink)
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If I were to do that or bring the lowers in, I would have to make the lowers like 60" long so the crossmember will clear the driveshaft under droop.
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Old 04-14-2019, 08:27 PM   #6 (permalink)
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Just a suggestion but the TRIAGED 4-link calculator does have link tension and compression values based on a variable loading condition that can be set via the "Acceleration" value from the 'materials" tab (Cell C2).
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