NOS and its effectiveness

[johneroberts]

Please discuss, as im not sure how it really works, and how iy can be adapted for the RS4
Cheers
jr

[jeffw]

As I understand it (!) NOS increases the amount of oxygen in the cylinder and allows more fuel to be burnt and therefore more power....and more heat ...

Like turbo/superchargers really.

[Andiroo]

Spot on Jeff [img]images/graemlins/grin.gif[/img]

Andiroo

[jeffw]

Thinking about it the NOS will increase the percentage of Oxygen in the cylinder and therefore burn the fuel more efficently rather than increasing the density of air which is what turbos do. Liquid oxygen would have the same effect [img]images/graemlins/wink.gif[/img] but is a little unsafe to have in a car (!)

[Andiroo]

To quote a well known expert;
"A simple characteristic of engine dynamics that is frequently overlooked is the fact that an engines power is limited by the amount of fuel you can burn efficiently in the combustion chamber, and this is limited by the amount of oxygen that the engine can draw into its cylinders, which in turn is limited by the size and efficiency of the engine. Thankfully power output from Nitrous oxide injection is not much affected by these limitations, and consequently disproportionate increases can be achieved if so desired. The amount of oxygen that a Nitrous system can flow is only limited by the various holes in the system (i.e. bottle valve seat size, nitrous pipe bore size, solenoid seat size, etc.)and consequently must be restricted by the jet hole size to a level that when mixed with the correct amount of extra fuel from the system will allow a sensible amount of power to be generated by the engine.

A none nitrous engine produces a smooth power curve which is a function of rpm, because the faster the piston moves the better the cylinders fill and the more frequently the cylinders fire, however add a basic Nitrous system and it‘s a different story. Nitrous oxide is delivered to the engine at a constant rate (e.g. 2 lbs/min) therefore at low rpm (e.g. 2,000 rpm) each induction cycle will inhale 2 lbs divided by 1,000 (the number of induction strokes), whilst at higher rpm (e.g. 10,000 rpm) each induction cycle will inhale 2 lbs divided by 5,000 which is only 1/5th of the amount at 2,000 rpm. The effect this feature has on the power curve can be quite dramatic (depending on how much power is being added), the power curve suddenly becomes a vertical line rising by the amount of extra power being added by the Nitrous system, and only returns to the normal curve (although at an elevated level equal to the power increase) once it reaches the desired increased level."

So basically to sum it up, it has an even more extreme effect than Steve's racing mods (Digitech post), but there again you wouldn't be using it all the time - so there is a definite benefit to be had.

The only problem you have is trusting someone to design the right system, and then fit it correctly [img]images/graemlins/shocked.gif[/img] (see my other post)

Injectors here [img]images/graemlins/shocked.gif[/img] [img]images/graemlins/shocked.gif[/img]

web page


Compared to where they should be ie. as close to the throttle body as poss.

web page

BTW still cant link the piccy into the post directly - try and add image, copy/paste shortcut, doesnt seem to work for me guys (help)

Andiroo

[johneroberts]

Seen this Andy http://www.geocities.com/Heartland/7756/rs4.html
Cheers [img]images/graemlins/grin.gif[/img] [img]images/graemlins/grin.gif[/img] [img]images/graemlins/grin.gif[/img] [img]images/graemlins/grin.gif[/img]
jr

[Andiroo]

[img]images/graemlins/smile.gif[/img] [img]images/graemlins/smile.gif[/img] [img]images/graemlins/smile.gif[/img] [img]images/graemlins/smile.gif[/img] [img]images/graemlins/smile.gif[/img]

Andiroo

[Thorney]

I don't think you can use it on trackdays though [img]images/graemlins/crazy.gif[/img]