Originally posted by anatolia
i realize this may be going out on a limb ( by the way thanks for your response ) i'm trying to rule out the pressure being higher as a result of a 900 lbs pressure tank expelling whatever it can through two .018 jets....one would think that could not be much in the traditional sense , however because it's nos it does cause the air to become more dense ....either way it's still the same thing to the engine - is that a fair assumption ?
well the manifold is not really a closed system right? you're talking about a dry setup not wet/direct port.
I would think you would have to find out how much nitrous is being expelled out of the two jets per second at a steady tank pressure of 900lbs. but with nitrous you're increasing the number of oxygen molecules chemically (in a sense), which with a a s/c, turbo you are increasing the number of oxygen molecules by increasing the pressure of the air.
I would guess that with a nitrous system the pressure of the manifold would not increase significantly if any.