How-to make your own Bump-steer bar:

[SwampDawg]

REVISED:
Panhard bar bracket location//Axle adjustment

*Note: looking over the truck, test-driving it, soforth...i have discovered a few minor glitches in my set-up, which now has been corrected here. Originally the panhard bar bracket used to be mounted using the 3mm screw/nut from the lower shock tower. But this did not secure the bracket enough, causing movement in the custom bracket. For this stage, youll need to drill a hole in the chassis as described below, along with adjustments that will have to be made to the front axle, after everything is assembled.



STEP .7.
After you have the metal bent over, install it onto the C-frame as shown below. To do this, drill a 3mm hole into the C-frame, where the custom bracket rests tight up against the shock tower for support.


STEP .8.
bring the bump-steer bar to this new bracket (mount) and adjust it, so the hole lines up to the hole in the mount. Install a 3mm screw and back it off with a nut and then adjust the axle from left to right. This needs to be adjusted properly or the axle will be offset from the rear axle. Take your time & adjust this so the front axle is "true" to the chassis.
Adjusting the panhard bar:
Look at the chassis head-on, and determine if the axle is center "True" to the chassis. You will first notice one shock may be rested up on the C-frame, because the axle is shifted over to far on one side. Adjust the panhard bar, so the axle moves in the direction whereas the shock that is touching the chassis moves away. In the image below, shows the truck at free-stance (Neutral stance).

Do the same for when you compress the suspension completely down!
make certain that nothing binds against anything, and that again, your axles sit "true" to chassis. Check for steering binding, suspension binding, etc...

If your satisfied with what you see, then your done. Just make a quick check to see if all the screws/nuts are tightened properly.
FIN.

[ruinx]

this is all very interesting I just put spacers between my pushrod at the servo and the knuckle and I have no bump steer on the other hand I have ideas about using 2 links from the servo to each knuckle while keeping the stock long bar there just in idea phase.

[metomwhou]

Great write up man. I've been having a bear of a time trying to get the chassis mounted servo set-up on my K2-3L rig. Right now its 4-linked and I'm just using a Z bend in my steering link but I'm still getting bumpsteer and it looks horrible. I'm gonna try an actual 3-link w/panhard set up like this and see how it goes. Thanks for the write up and how-to!
Tom

[elenorzx]

Came out really nice.

[SAL45]

Nice mod Did your steering one as well and its awesome Way to think outside the box!

[SwampDawg]

thanks for the comments, appreciated!
and im glad i could help.

Here is the newest pic of the front only this time i pulled the link off the steering, and used heatshrink to clean it up.

[rccrawlerguy]

cool i might have to try it

[CRAWL UGLY]

Awesome

[draper_88]

so if i am understanding this correct if i have stock links on my scx10 and do the servo on the chassis i don't need the pan hard bar? i might be mis-understanding this. thanks

[rednck21]

Originally Posted by draper_88

so if i am understanding this correct if i have stock links on my scx10 and do the servo on the chassis i don't need the pan hard bar? i might be mis-understanding this. thanks

Correct.

[draper_88]

ok thanks

[eric113]

Does the panhard bar mount on the axle have to parallel to mount on the chassis ?

[fallensk8man89]

so wat exactly is bump steer?

[2500hdon37s]

Originally Posted by fallensk8man89

so wat exactly is bump steer?

bump steer is when your suspension flexes and the upward movement of the axles causes the steering linkage to move thus steering your tires, so the bump steer bar helps elemnate that

[zrxw13]

So what length did your drag link end up being????

[revo au]

Great write up, i've used your servo mount idea fits like it was made for that position.

[cmyers1]

X2 Very good write up very informative thanks!

[SlickRockSpider]

We may be miss understanding a couple of terms.

Bump steer involves the steering linkage.

Panhard or Track is to control axle steering.



Evan

[Optiskate]

Originally Posted by SlickRockSpider

We may be miss understanding a couple of terms.

Bump steer involves the steering linkage.

Panhard or Track is to control axle steering.



Evan

Sort of.


The purpose of the pan hard has nothing to do with the steering. Its to laterally locate the axle. If it wasn't there under certain types of suspension like a 3 link (non-wishbone) or a non-triangulated 4 link, then the axle would simply walk right out from under the rig. However, it does affect the steering. If the drag link and pan hard are not parallel, then they wont follow the same arc through articulation. When this happens it forces your drag link/steering to move undesirably, hence bump steer.

[rckjeep]

Originally Posted by metomwhou

Great write up man. I've been having a bear of a time trying to get the chassis mounted servo set-up on my K2-3L rig. Right now its 4-linked and I'm just using a Z bend in my steering link but I'm still getting bumpsteer and it looks horrible. I'm gonna try an actual 3-link w/panhard set up like this and see how it goes. Thanks for the write up and how-to!
Tom

I did a 3 link with panhard on my XJ using a K2-3L chassis in the 1.9 section check it out it help you