scx10 Chassis Mounted Servo CMS mod detailed write up

[Devil Inc]

To the passenger side...

You've got the upper link running from the passenger side of the chassis to the top-center of the diff. Panhard runs from where the servo is mounted down to the top-passenger side of the axle.

Reverse the procedure for you euro/right hand drive folks.

 

[Big Tex]

To the passenger side...

You've got the upper link running from the passenger side of the chassis to the top-center of the diff. Panhard runs from where the servo is mounted down to the top-passenger side of the axle.

Reverse the procedure for you euro/right hand drive folks.

Ohh shazzam there it is literally waited 3 days just for that answer, thanks a bunch bro "thumbsup"

 

[SinCity]

I just did this on my SCX-10. Looks 100% better, however the steering linkages seem to be hitting. The servo appears to be sitting to low with how I mounted mine (same as the OP, just different servo). I am going to try to use some 2-3mm spacers to bump the servo up a little higher. I'll post some pictures later when I get back home, and I'm able to sit down and look at it closely to see what I can change. I didn't need to drill anything, I actually made a bracket to lift my bumpers, and surprisingly the holes I drilled for the bumper mount/bracket lined up PERFECTLY with the servo mount. Despite the added scale look, it seems like I created quite a bit of play in the steering. I foresee some hefty bump steer coming.

(1) EDIT: I may flip the servo mount thing. I saw somebody do that on the 2nd page of this thread, looks like it may fix my linkage contact.

 

[Meatwad]

Without a panhard setup you will have major bumpsteer unless your suspension is mostly droop.

 

[SinCity]

Without a panhard setup you will have major bumpsteer unless your suspension is mostly droop.

:roll: kind of figured this. I have wanted to do a panhard. But the links on the steering aren't exactly scale diameter. Any idea where I can get thinner rods, but still have them strong? If this was a scale truck, these steering linkages/panhards would be 6" in diameter. Doesn't look to hard to make a panhard. All the kits I see have brackets running everywhere and kind of don't look too good. I don't see why something going from the axle to the chassis will reduce bumper steer. But then again, I have IFS on my 1:1.

Thanks for the reply.

Any thoughts on this product? Seems to knock out both birds with one stone.
http://www.rpphobby.com/product_p/levscx-09.htm

 

[Perkolator]

panhard bar reduces bump steer because it helps keep the horizontal movement of the axle in check, when the axle's traveling in the vertical plane. if the axle moves horizontally while you're trying to move it vertically, it's gonna change the steering slightly = bump steer.

as for your link diameters, they'd actually only be 2.5" diameter if using 1/4" rods. you can get thinner rods, but you'd typically have to make them from stronger material to withstand the forces put on them - which is why some people go for solid titanium links. around 1/4" OD is pretty standard since brakeline is one of the more common supplies readily available on the shelf.

 

[SinCity]

panhard bar reduces bump steer because it helps keep the horizontal movement of the axle in check, when the axle's traveling in the vertical plane. if the axle moves horizontally while you're trying to move it vertically, it's gonna change the steering slightly = bump steer.

as for your link diameters, they'd actually only be 2.5" diameter if using 1/4" rods. you can get thinner rods, but you'd typically have to make them from stronger material to withstand the forces put on them - which is why some people go for solid titanium links. around 1/4" OD is pretty standard since brakeline is one of the more common supplies readily available on the shelf.

Thanks for the information. I have read a lot about the panhards on the scalers and I like the idea. I plan on going by my LHS and see if I can't find a short link and some servo mounts to make a panhard. I'll post some pictures in a bit.


Thanks again!

 

[Gregorius]

I have almost the exact setup. The bump steer was so bad that I decided to mount the servo back onto the axle.

 

[Meatwad]

Get this:
http://www.tcscrawlers.com/Hand-Brothers-Off-Road-Axle-Bracket-for-Axial-AX10-Scorpion-p-17697.html

And fab the rest. Done.

 

[winnerone23]

I just did this mod myself, as I had to do some repairing.. I seem to have everything worked out. I'll post up once I get to run my rig.. 4link setup with the cms.. can't wait to see the diff with what everyone is saying.. pros an cons..

 

[joshjunior]

Nice write up....Super easy to understand!"thumbsup"

Bill: You will most likely need a custom length drag link it all depends on the rig and suspension set up.
CMS itself pretty much for looks, it performs no better than axle mounted steering....It can actually be worse, because it moves the servo up higher, and without a panhard bar you will have bump-steer when the axle articulates.

I was thinking about doing something similar on mine. When I had it on the table I noticed the servo actually hits the frame up inside. So I actually lose some flex there.

 

[Abomb1982]

Is there function for this mod or just for scale look?

 

[Lentsnh2012]

Is there function for this mod or just for scale look?

Mostly just a scale look. It ruins your steering throw and servo strength.

 

[maxxdrive]

If set up properly it does not affect your steering throw or servo strength. I have my steering end points backed down to 85% to keep from breaking my CVDS. Now I am running a Savox 500oz servo a Robitronics aluminum clamping horn, VP zero Ackerman high steer knuckles, Axial chubs and axial CVDS.

Sent from my SCH-I605 using Xparent BlueTapatalk 2

 

[Lentsnh2012]

If set up properly it does not affect your steering throw or servo strength. I have my steering end points backed down to 85% to keep from breaking my CVDS. Now I am running a Savox 500oz servo a Robitronics aluminum clamping horn, VP zero Ackerman high steer knuckles, Axial chubs and axial CVDS.

Sent from my SCH-I605 using Xparent BlueTapatalk 2

No, it does. I can't think of many guys who run a CMS in comps for that reason. "thumbsup"

 

[Meatwad]

Mostly just a scale look. It ruins your steering throw and servo strength.

Gotta disagree with this. While it does nothing performance-wise and is harder to set up than axle mounted... when properly set up, the performance is the same.

 

[Meatwad]

No, it does. I can't think of many guys who run a CMS in comps for that reason. "thumbsup"

I run cms in comps.

 

[Richterat83]

Just finished doing this on mine, but ran into some issues with the vanquish stage 1 and currie links. Had to swap back to the kit aluminum steering link (currie is way too long) and also swapped the end links on the larger steering rod to the angled one to drop the lower bar to stop from hitting the servo arm. Also had to mount the serv 180 degrees,from the op.

But seems to work . Swapping the front end to 4 link tomorrow

Sitting normal

Full droop

And compressed (still slightly hits the servo horn)

 

[Nelanzor]

Used this to mount my CMS on my stock Dingo, but this is how it steers after mounting everything.
https://www.youtube.com/watch?v=Y_OymhpON0U

did I do something wrong or is something else needed?

 

[Meatwad]

Panhard.