How does NITROUS work

This may sound like a dumb question but i would like to know how nitrous works and how to use it correctly.

On a very basic level, nitrous is used because it's damn cold. When you do a basic intake setup, nitrous is sprayed directly into the intake. It instantly cools down everything it comes in contact with, be it air or the piping itself. As you should know, colder air = denser air. The colder the air getting into your engine is, the more air is getting in, the more power you make. That's a simple setup.

Several companies make an intercooler sprayer. Nitrous (or CO2 in some cases) is sprayed directly onto the intercooler fins. This works like an intercooler water sprayer on steroids and cools the air passing through the intercooler that much more.

Some systems pass CO2 through the fuel rail, cooling the fuel. I'm not as clear on this concept, but I suspect that the colder the fuel, the colder the air it mixes with, leading to the same end result. One product similar to the fuel rail cooler is what's known as a "NOSzle." The standard fuel injectors plug into these nozzles, and the nozzle plugs where the fuel injector usually would. As a result, nitrous flows directly in with the fuel, causing the same end result. These are popular due to their simple installation.

The "best" form of nitrous usage is what's called "direct port nitrous injection." In this case, holes are actually drilled into the intake manifold runners. Each runner gets its own fogger. When the nitrous is activated, nitrous is sprayed directly into the runner. I'm not as clear as I could be on this type of injection. I know it cools the air, but I believe nitrous ends up getting into the piston and explodes (in addition to the cooling effect). I very well might be mistaken here, so wait for somebody else to clarify.

The purging that you've probably seen in videos/movies (for instance, 2F2F) is exactly that. When the bottle is in the trunk, a rather long line must be installed to connect it to the engine. As a result, the liquid nitrous in the line will begin to dissipate when not used. It will collect in the lower points of the line and the rest will be a gas. Instead of firing this potentially dangerous and uneven mixture into the engine, a button is pressed which vents the compressed gas to the atmosphere, allowing the line to fill with liquid nitrous again.

Hopefully that helps a little.

Thanks alot that helped me out alot but one more question whats the difference between a wet shot and a dry shot?

I'm going to type up a really long thing about nitrous here in the next few days, I'll post a link here when I get done. It's gonna be LONG!

In that case, I apologize in advance for any mistakes I made.

Why write something new?
It's all explained really well here:
http://auto.howstuffworks.com/question259.htm

that nos naughty or nice link at the bottom of the howstuffworks page was interesting

the cooling effect that nitrous has on intake air is just a helpful byproduct. the main advantage to nitrous is that it contains alot of oxygen. it is one part oxygen for every two parts nitrogen: 1/3 oxygen to nirogen ratio, this is far more oxygen than in atmosphere. your engine will actually run hotter, way hotter, because it will run leaner.

the cooling effect that nitrous has on intake air is just a helpful byproduct. the main advantage to nitrous is that it contains alot of oxygen. it is one part oxygen for every two parts nitrogen: 1/3 oxygen to nirogen ratio, this is far more oxygen than in atmosphere. your engine will actually run hotter, way hotter, because it will run leaner.

You're close but you're missing a few key points.
First, that would be a 1:2 ratio. 1 part Oxygen for every 2 parts of Nitrogen.
Secondly if the Nitrous system is set up properly the engine won't run lean. When N2O is added to the intake Fuel must be added also. This is where the difference between wet systems and dry systems come in. Dry systems rely on the engine management (factory of aftermarket) to enrich the fuel mixture. Wet systems add their own fuel sometimes through more fuel injectors, or through a device like the "NOSzle".

Hope this helps,
-Eric

Thanks Guys