That's what the spring does, not the damper. The damper just controls the oscillations. This is incorrect buddy. The oil viscosity will alter the compression speed and how fast the spring can 're extend the damper.
There is rebound on the Spring and there is also a rebound on the shock itself the viscosity of the oil controls how fast the rebound of the shock moves in and out. Shock oil helps keep the tires from bouncing around uncontrollably over bumps. Im sure you've seen car driving down the road with blown shocks.
@@NsousaFX I race a real car. 😂😂👌 is called rebound dampening but the damper is not nitrogen charged. Spring up with no springs you have trapped air in the oil lol. I'm sorry but your are all wrong. Use the oil and valving to dampen and the spring to do the rest.
I have one question that's been on my head for a while. On a side note: I have always set my 1/8 nitro buggy shocks to 3 quarter rebound front and half in the back as standard every single time regardless of condition. I am using the shock weight and piston head ( hole diameter and number ) to control the reaction of the dampening of the shock according to track conditions ( occasionally compensating thinner fluid in cold weather and thicker in hot respectively ). This way i never had any issues with my shocks and have always had consistent runs. Now my question is: after you set your rebounds and carefully check they are symmetric left and right, you set your spring on the shock. Doesn't the prolonged extended state of the shock extend your rebound to maximum anyway ? i mean after the shock sits its maximum travel position for more than 20 seconds doesn't this simply displace the fluid under the piston head, trough the piston head holes, to its top ? i hope this make sense to someone :)) thank you
The shock oil is not supposed to put pressure down on the tires, that is what the springs are for. The shock oil is simply used to adjust dampening. The objective to building a shock is to make it "dead" or have no rebound. When a shock is built with rebound, it will be very inconsistent when dampening bumps and jumps.
+Nuno Sousa Sorry for that, I owe an apology. You are right, I should have researched rebounding a little more before commenting. Years ago the people at my local race track taught me to build shocks with no rebound, and I have been doing it that way ever since. Didn't mean to be rude, I'm just stubborn lol
This isn't what damper rebound is. You are correct that there is such a thing, and indeed it is a very important part of shock absorber physics. The damper has a rate at which it dampens motions, compression/extension(rebound). In a siple standard piston shock absorber like almost every RC shock absorber it's just a piston with holes. This makes a 50/50 compression/rebound absorption. That's it. To have anything like say... 60/40 compression vs rebound you need a valve which constricts oil flow one way but opens up on the oher. In life size shocks these are sometimes adjustable which adjusts valves using a knob. But obviously, filling in more oil in your RC shocks causes the shaft to come out and "rebound" right? Well sure you can call that "rebound" if you want, because you pushed it in and then it's coming out again, but that has nothing to do with actual motion damping. So then why does it come out after you push it in? And why does it come out more when you put more oil in? Your shock shaft has a volume. When you fully extend the shock, it does not have the shock shaft taking up space within the cylinder. When you fully compress the shock, the shaft takes up space inside which displaces oil, basically making it want to spill. Because liquid is practically incompressible it would mean that it would be impossible to compress a shock without something that gives. This is why the top on the shock is sealed by a rubber diaphragm. This piece of rubber not only seals, but also stretches as the shock shaft takes up space and pushes oil up. What pushes the shock out again is actually the diaphragm pushing back on the oil as it tries to return to it's original shape, in the process making the shaft slowly come out. If you're interested in getting real rebound tuning, Traxxas sells a "Variable Damper Kit" for their GTR shocks which does exactly what we're talking about. The pistons have a small valve that let's oil easier one way than the other. It's also possible to custom make piston valves using a thin flexible material and drilling extra holes in the piston under the valve material. Btw don't worry. It's all part of the learning process, we all came from somewhere and heading somewhere else. Most people dont even know theres such things as rebound rates so you still had a head start on most of us. Keep doing your thing! :)
Ahh yes, I had learned and then forgot the part about the volume of the shaft. I was repairing a shock last week and wondered again why that happened. Symptom of growing old I reckon. Cheers!
Ya! I bought the Traxxas Nitro Slash 2wd, with the TRX 3.3 Racing Engine. My Stock Shocks had No Rebound. But, all 4 Shocks did have Shock Oil in them. My Nitro Slash had 50 Weight Shock Oil in all 4 Shocks. That's what my Owners Manual said anyway. I am Changing Up my Shock Oil. I am Putting 60 Weight Shock Oil in the Front 2 Shocks, and i am Putting 80 Weight Shock Oil in the Rear 2 Shocks. I am goona do a few other things, to My Nitro Slash. I am also putting a New Chrome Traxxas Tuned Exhaust Pipe on My Nitro Slash. I Bought the Mid-High Tuned Exhaust Pipe, and i can't wait to put, My New Traxxas Chrome, Mid-Too-High Range Exhaust Pipe AND Freshly Oiled Shocks. Lets do this and WIPE-OUT ALL THE E-WORDS.... Braaaaaap!!!
That's what the spring does, not the damper. The damper just controls the oscillations. This is incorrect buddy. The oil viscosity will alter the compression speed and how fast the spring can 're extend the damper.
There is rebound on the Spring and there is also a rebound on the shock itself the viscosity of the oil controls how fast the rebound of the shock moves in and out. Shock oil helps keep the tires from bouncing around uncontrollably over bumps. Im sure you've seen car driving down the road with blown shocks.
@@NsousaFX I race a real car. 😂😂👌 is called rebound dampening but the damper is not nitrogen charged. Spring up with no springs you have trapped air in the oil lol. I'm sorry but your are all wrong. Use the oil and valving to dampen and the spring to do the rest.
I have one question that's been on my head for a while. On a side note: I have always set my 1/8 nitro buggy shocks to 3 quarter rebound front and half in the back as standard every single time regardless of condition. I am using the shock weight and piston head ( hole diameter and number ) to control the reaction of the dampening of the shock according to track conditions ( occasionally compensating thinner fluid in cold weather and thicker in hot respectively ). This way i never had any issues with my shocks and have always had consistent runs. Now my question is: after you set your rebounds and carefully check they are symmetric left and right, you set your spring on the shock. Doesn't the prolonged extended state of the shock extend your rebound to maximum anyway ? i mean after the shock sits its maximum travel position for more than 20 seconds doesn't this simply displace the fluid under the piston head, trough the piston head holes, to its top ? i hope this make sense to someone :)) thank you
Doesn’t the spring do that
No..when all 4 are set to zero rebound u can push the car down and it will stay down..try.
@@sheniquemedina5685 that means shock oil is too thick or valving too small lol
@@sheniquemedina5685 then you have no springs
The shock oil is not supposed to put pressure down on the tires, that is what the springs are for. The shock oil is simply used to adjust dampening. The objective to building a shock is to make it "dead" or have no rebound. When a shock is built with rebound, it will be very inconsistent when dampening bumps and jumps.
all shocks should have some sort of rebound. to much isn't good and have none also isn't good. look up team Losi shock video
+Nuno Sousa Sorry for that, I owe an apology. You are right, I should have researched rebounding a little more before commenting. Years ago the people at my local race track taught me to build shocks with no rebound, and I have been doing it that way ever since. Didn't mean to be rude, I'm just stubborn lol
+RC Grid no worries we are all here to help each other :)
Nuno Sousa when I push my e Revo down. It doesn’t rebound back to its normal position. It just stays there. Is this normal?
@@andresvillagomez75 put some spacer/ pre load clips on the shocks
I use that same shock fluid weight in my slash 4x4 ultimate
This isn't what damper rebound is. You are correct that there is such a thing, and indeed it is a very important part of shock absorber physics.
The damper has a rate at which it dampens motions, compression/extension(rebound). In a siple standard piston shock absorber like almost every RC shock absorber it's just a piston with holes. This makes a 50/50 compression/rebound absorption. That's it.
To have anything like say... 60/40 compression vs rebound you need a valve which constricts oil flow one way but opens up on the oher. In life size shocks these are sometimes adjustable which adjusts valves using a knob.
But obviously, filling in more oil in your RC shocks causes the shaft to come out and "rebound" right? Well sure you can call that "rebound" if you want, because you pushed it in and then it's coming out again, but that has nothing to do with actual motion damping.
So then why does it come out after you push it in? And why does it come out more when you put more oil in?
Your shock shaft has a volume. When you fully extend the shock, it does not have the shock shaft taking up space within the cylinder. When you fully compress the shock, the shaft takes up space inside which displaces oil, basically making it want to spill. Because liquid is practically incompressible it would mean that it would be impossible to compress a shock without something that gives. This is why the top on the shock is sealed by a rubber diaphragm. This piece of rubber not only seals, but also stretches as the shock shaft takes up space and pushes oil up. What pushes the shock out again is actually the diaphragm pushing back on the oil as it tries to return to it's original shape, in the process making the shaft slowly come out.
If you're interested in getting real rebound tuning, Traxxas sells a "Variable Damper Kit" for their GTR shocks which does exactly what we're talking about. The pistons have a small valve that let's oil easier one way than the other. It's also possible to custom make piston valves using a thin flexible material and drilling extra holes in the piston under the valve material.
Btw don't worry. It's all part of the learning process, we all came from somewhere and heading somewhere else. Most people dont even know theres such things as rebound rates so you still had a head start on most of us. Keep doing your thing! :)
Ahh yes, I had learned and then forgot the part about the volume of the shaft. I was repairing a shock last week and wondered again why that happened. Symptom of growing old I reckon. Cheers!
You seem to know your stuff do you mind if I pick yiur brains??
@@dualtrondreamteam6811 go for it :)
Ya! I bought the Traxxas Nitro Slash 2wd, with the TRX 3.3 Racing Engine. My Stock Shocks had No Rebound. But, all 4 Shocks did have Shock Oil in them. My Nitro Slash had 50 Weight Shock Oil in all 4 Shocks. That's what my Owners Manual said anyway. I am Changing Up my Shock Oil. I am Putting 60 Weight Shock Oil in the Front 2 Shocks, and i am Putting 80 Weight Shock Oil in the Rear 2 Shocks. I am goona do a few other things, to My Nitro Slash. I am also putting a New Chrome Traxxas Tuned Exhaust Pipe on My Nitro Slash. I Bought the Mid-High Tuned Exhaust Pipe, and i can't wait to put, My New Traxxas Chrome, Mid-Too-High Range Exhaust Pipe AND Freshly Oiled Shocks. Lets do this and WIPE-OUT ALL THE E-WORDS.... Braaaaaap!!!
Old comment, but I discovered the exact same thing on my nitro slash' shocks. So, how did the weight oil work out for you that you put?
what happen when ur 4 shock no rebound?wht should I do?i forgot to change my shock oil...the oil is very dirty...now i hv losi 60 wt.
matt edet mE Nop udrsan u
there is nothing wrong if all 4 shocks have 0 rebound. Infact this is a good thing because they will perform similarly when you drive.
You never mention "how" to adjust rebound😮
Weight of the oil gives you different rebound
Good video, i was able to properly adjust my shocks. Thanks!
50 is a good all around I use it on my maxx and my wifes rusler 4x4
I love Losi shock oil.
The spring helps it stay reboned