Ok so being a noob I need a little help. I understand there are tons of threads of what oil, shocks, tires, ect people use for jumping. My problem is I don't understand said options to make my own decision in different circumstances.

So my setup right now is blue springs in back silver in front with 50 weight oil and LT arms installed. (LT arms come out for juming I used for forck crawling)

What I don't understand is the WHY.

Let's say that jumps are in the 7 ft of air range.

Questions:
1. What is the difference in changing weights. ie going to 65 instead of 50 or even 30?

2. Why would I put certain springs on? Why blue/silver and what is the difference between lighter and heaver springs in jumping or anything.

I understand that the thicker weight provides a stiffer response and the heaver springs are harder to compress. But why do I want that versus a more plush feel.

3. finally the biggest confusion is pre load. with said settings (50 weight oil, blue/silver springs)

Why would I put the pre load to the top, why would I lower a little or why would I make it tight?

I don't understand the mechanics of this.

Answers to these questions would help me understand the "theory" of the setups and thus could make my own decisions.

also interseted in racing so I think understanding these mechanics would help me make choices for the track.

again thanks you guys are great I searched for this kind of thing and al I have found is I jump so much feet and these are my settings I race and these are mine but I don't know why people choose those settings.

I did post somewhere else and haven't got any responses plus I would like to hear more views.

the weight of the oil is thickness of the oil. the higher the number the thicker oil.thicker oil will absorb harder landing but can make handling less responsive. preload spacers are for rebound they will make your car spring back up to its ride height. thicker springs will help with absorbing the landing but this makes your truck sit higher subjecting you to rolling easier. the same applies goes with preload spacers. setting up for a track is trying diffrent set ups and finding what works best for your driving style.start exploring! hope this helps.

yes it does thanks alot
pre load vs spacers I am refering the the threaded shock part on e revo that is black and screws up and down the shock not sure which of you said items that is.

But this does help tremendously, thanks

if you screw those down it creates more preload which will be stiffer ride. beware of what is called pogoing which is when your shocks dont absorb the terrain and causes your truck to bounce around instead of being plush. the screw down is your preload adjuster for your shocks. good luck!

think of it this way:

1. the shock oil handles/absorbs the landing, NOT the springs. compression of the springs does not absorb much energy compared to the oil in the shock. actually it's the air bubbles in the oil which are compressed.

2. the springs do the opposite, open the shock back up (out). so if you have 2 sets of shocks (lets say heavy in the front and light in the back), the heavy set in the front will open with more force than the backs. if you are in mid air, that will cause the the nose to point down as there is more force pushing downward on the front axle compared to the back axle.

3. if a shock is preloaded, it doesnt need to be compressed before it begins to push back out, so it rebounds sooner.

that's basically how a shock works on r/c cars, once you master that, it's pretty easy to figure out how your car will handle.