Shock oil weight

[deephis46]

I have a D90 rig that is weight about 4kg or 8.8lbs and I have installed Gmade RSD Scale shock. Noticed when running it, it bounces on rough terrain.
Is this cause from thinner shock oil (stock Gmade shock oil)? Or other?
How to determine proper shock oil on a rig?

deephis

[RCMFMaxxMan]

I haven't worked on these shocks specifically, but any shock depends on the piston design and body size to make a comparison to another shock (all other variables equal). They are about the same diameter as RC4WD King Shocks, and if the piston is similar, you'll want some pretty heavy oil. Start with 1000 CST (about 80 wt.). If that's too much, try 40 wt. If 1000 is not enough, try 2000 CST, 5000 CST, or 10k CST. I run 10k in my Kings and it works great. This is why it is called tuning!

[EeePee]

Yep, tuning. But it basically could be too much spring causing undamped bounce, or the shock is overdamped and packing up causing bounce. Got to get all up in there and watch it to see what's happening.

And, crawlers aren't supposed to go fast so you could just be expecting too much from the thing. I mean, the new Traxxas Defender does a reported 11 mph, so that'd be like 110 mph and that's just dumb.

[deephis46]

Just tried 10k diff oil lol, just for test and it works but to stiff. I will try 1000cst. The pistons I used are 2 holes on it.

RCMFMaxxMan, how heavy is your rig running with Kings with 10k oil?

EeePee, The spring on them actually little bit stiff than Kings.

[RCMFMaxxMan]

It's actually fairly light compared to yours: about 3kg. I just checked and the Kings use a 3-hole piston, and I even remember there being a bit of a gap between the piston and the body. This rig is setup to be pretty slow too, so I like the slower suspension response. If it were faster, like EeePee said, the truck would probably be bouncy on rough terrain due to over damping. Try the 1000. That will probably be much more appropriate. On another note, my rock racers generally run about 35wt. oil, but in a bigger shock, so if you are in fact running a faster rig, I may be pushing you too far in the wrong direction! Good luck!

[Teng]

My Wraith weighted around 3.8kg with my Pro-line PowerStroke shocks, I used 30wt and happy with the result. Since I was doing bashing more than serious crawling , so I think I would try 25wt oil next time( I was hoping more faster rebound with lightest spring in front of my Wraith )

[deephis46]

Originally Posted by RCMFMaxxMan

It's actually fairly light compared to yours: about 3kg. I just checked and the Kings use a 3-hole piston, and I even remember there being a bit of a gap between the piston and the body. This rig is setup to be pretty slow too, so I like the slower suspension response. If it were faster, like EeePee said, the truck would probably be bouncy on rough terrain due to over damping. Try the 1000. That will probably be much more appropriate. On another note, my rock racers generally run about 35wt. oil, but in a bigger shock, so if you are in fact running a faster rig, I may be pushing you too far in the wrong direction! Good luck!

I have tried 1000, looks still stiff on my rig. I will try change the pistons. If not enough I will down to 800.

[Dbx]

The stock springs will be way too stiff on a typical crawler. There are a couple of threads going on the rsd shocks (scx10ii section). Most people are going for the rc4wd krawler springs to get it right. I run rsd's with stock spring in my modified Twin Hammers - i needed 10,000wt dif oil to settle it down, and it still has a bit of bounce when landing jumps.

[Shinchu]

Originally Posted by Teng

My Wraith weighted around 3.8kg with my Pro-line PowerStroke shocks, I used 30wt and happy with the result. Since I was doing bashing more than serious crawling , so I think I would try 25wt oil next time( I was hoping more faster rebound with lightest spring in front of my Wraith )

I just went from 25 to 45 in my yeti powerstrokes. Still a little soft. Great articulation, but horrible for jumps. I mean, ANY airtime results in chassis slap.
Might even need stiffer springs. Stiffer is a word, right?

As for the d90 in question... man thats heavy! I would double the oil weight until its right.
I mean a bottle of oil costs less than a frappacino. Just test and tune! Feels so good when its finally dialed in.