4 link setup/ Axle steer problems

[TOMS97ZJ]

I have a truck that is setup with a 4 link suspension.

It has lots of articulation (maybe too much) and has really bad axle steer.

I bought all new delrin rods to redo everything but I want to do it right.

Should all 4 links be the same size? How do I setup the pinion angle?

How important is a panhard bar? Will having one stop axle steer?


Thanks


if this should be in newb tech feel free to move, but I figured gen tech would be ok.

[oldhippie]

Originally Posted by TOMS97ZJ

I have a truck that is setup with a 4 link suspension.
It has lots of articulation (maybe too much) and has really bad axle steer.
I bought all new delrin rods to redo everything but I want to do it right.
Should all 4 links be the same size? How do I setup the pinion angle?
How important is a panhard bar? Will having one stop axle steer?


Thanks


if this should be in newb tech feel free to move, but I figured gen tech would be ok.

This is a good place to start:
Torque Twist, Still not Solved.
It really is about triangulation and squat. Triangulation will limit axle steer and keep the axle centered. Ya want squat on the the front and anti-squat on the rear going forward. The lower links take more abuse than the uppers. I use larger links and rod ends (5/16-3/8 & 4mm revo ends) on the lowers than the uppers (1/4" & 3mm traxxas ends). Running the same length links (upper & lower) will keep the axle and pinion angle more constant through the suspension movement (a good thing). The pinion angle should point at the transmission output but it is more important to have some caster on the front steering than the steep pinion angle (clockable Cs help here). A panhard bar is a hindrance in a proper 4 link setup. I have found Asymmetrical rear links to be the best answer for torque twist. At least this is what I believe but it really is a black art.

[TOMS97ZJ]

How do I make it more triangulated?

Here is my setup...


Sorry for the fuzzy picture, Droid camera's suck.

[sierrajim]

Make a new skid/modify your current one to triangulate the chassis end of your lower links.