Wierd suspension issues. (Video inside) I need help!

[turbotron]

FB09E9CE-E152-4ACA-AF84-244425D78B82_zpsuayuh7o6.mp4 Video by nickprorokovic | Photobucket

Not sure if these links will work but hopefully you guys can see the videos

[turbotron]

I'm sorry for the horrible video quality

[robertjpjr]

It looks to me that your upper links are too long. The suspension can't articulate in its intended range of motion. Essentially, when you push your axle up, you are binding on the triangle you create with your upper links. This is one time I wish I paid more attention in geometry class.

I would try to relocate / shorten the uppers. OR relocate your shocks higher up.

Do the axles move when the uppers are disconnected? I assume yes.
4 Links are meant to be more horizontal. The steep angle, reduces the effectiveness and obviously creates binding issues.

[turbotron]

Originally Posted by robertjpjr

It looks to me that your upper links are too long. The suspension can't articulate in its intended range of motion. Essentially, when you push your axle up, you are binding on the triangle you create with your upper links. This is one time I wish I paid more attention in geometry class.

I would try to relocate / shorten the uppers. OR relocate your shocks higher up.

Do the axles move when the uppers are disconnected? I assume yes.
4 Links are meant to be more horizontal. The steep angle, reduces the effectiveness and obviously creates binding issues.

When the shocks are mounted back to the vertical position, and upper links unhooked it compresses fine. Tonight i will try and relocate them

[robertjpjr]

I built a 6x6 from scratch. Took me some trial and error. Lots of error...

[turbotron]

Originally Posted by robertjpjr

I built a 6x6 from scratch. Took me some trial and error. Lots of error...

Yeah, thats what im running into..

[K.O.M.]

The upper links are too long, and mounted too high. You have essentially triangulated-out any vertical motion out of the suspension with your current setup.

The three holes between where you currently have your upper links mounted on the chassis and the lower link mounts are the stock upper link mount locations--best to try those spots first with the appropriate length links.

[C*H*U*D]

Originally Posted by K.O.M.

The upper links are too long, and mounted too high. You have essentially triangulated-out any vertical motion out of the suspension with your current setup.

The three holes between where you currently have your upper links mounted on the chassis and the lower link mounts are the stock upper link mount locations--best to try those spots first with the appropriate length links.

Agreed.

I assume you are doing a monster truck build? What I would do is use the AX chassis for your link geometry, and the SCX chassis as the upper shock mounts. Don't try to combine the two.

Even with using the AX chassis for your link geometry, it looks like you are asking for too much height out of your setup...those lower link and drive shaft angles are pretty steep.

Good luck, and I'd like to see this once you get it worked out.

[Dostradamas]

Why are you combining the scorpion chassis with the scx10?
I have a scorpion based sporty.
This is how mine are in the rear.

I also am working on a 6 x 6 based on a scx10 chassis & I cannot see an advantage.
KOM is right, the uppers are connected way high.

Ahhh CHUD Monster truck, I guess I could see that.

[C*H*U*D]

Originally Posted by Dostradamas

Ahhh CHUD Monster truck, I guess I could see that.

I thought he might be going after something like this, and also the monster truck tire he's using as a stand was a bit of an indication:

[turbotron]

Originally Posted by C*H*U*D

Agreed.

I assume you are doing a monster truck build? What I would do is use the AX chassis for your link geometry, and the SCX chassis as the upper shock mounts. Don't try to combine the two.

Even with using the AX chassis for your link geometry, it looks like you are asking for too much height out of your setup...those lower link and drive shaft angles are pretty steep.

Good luck, and I'd like to see this once you get it worked out.

Yep, nailed it on the head. Im doing a axial clod (body and wheels) Im excited for the built, Its going to be fairly simple. Just something for the sun and i to play with in the mud/water. I figured that was my problem! and i see what your saying by focus on the ax10 portion to run my links.
Ill post a mini build thread here soon.

Originally Posted by Dostradamas

Why are you combining the scorpion chassis with the scx10?
I have a scorpion based sporty.
This is how mine are in the rear.

I also am working on a 6 x 6 based on a scx10 chassis & I cannot see an advantage.
KOM is right, the uppers are connected way high.

Ahhh CHUD Monster truck, I guess I could see that.

Yes sir, it sorta gives it that old retro looking monster truck style. Plus, the transmission sitting in the ax10 portion will allow me to lift the truck more, utilizing a significantly less harsh drive shaft angle. Plus a tad bit lower COG being lifted so high. I will post up some pictures, it sounds crazy, but ive seen it done before and it looks pretty cool IMO

[Dad,Canyoufix?]

I agree. Shorten the top links and mount them lower.

[TSK]

First of all the axle should not roll like that.

Second, the there is far too much vertical link separation between the upps and lowers at the chassis end. The uppers being too long shouldn't be much of a factor unless the driveshaft is at a bad angle.

Speaking of driveshafts, make sure the collapsed length is short enough to compensate for the WB change during suspension cycle. To me, I bet that's actally what is preventing the suspension from compressing as it's probably bottomed out.

[turbotron]

Originally Posted by TheSCorpionKing

First of all the axle should not roll like that.

Second, the there is far too much vertical link separation between the upps and lowers at the chassis end. The uppers being too long shouldn't be much of a factor unless the driveshaft is at a bad angle.

Speaking of driveshafts, make sure the collapsed length is short enough to compensate for the WB change during suspension cycle. To me, I bet that's actally what is preventing the suspension from compressing as it's probably bottomed out.

Wow I didn't think of that. Yeah I realized today I need to mount the lower links underneath the shocks just as the wraith is mounted. I guess I can just cut the drive shafts male ends if this is the case.

[Dostradamas]

The axle rotation is not because of the lower shock mounting position.
The uppers are holding solid, not rising.
SCX10 shocks are mounted as you have yours in the vid.
I still say move the upper mount down & shorten it until you get the pinion angle you want & it should cycle fine.
Try it without the shocks & you can feel more of whats happening.

[turbotron]

Thanks a million guys!! Lowering and shortening the upper links fixed the issue!!

[Nicolasmj]

from the 1:1 world uppers should be 70% of the lower length and the separation at the frame should be half of what it is at the axle.