It might get you up to atmospheric, but you probably have to be going pretty darn fast. A while back I read an article analyzing the TransAm Ram-Air, and it boiled down to a couple horsepower (on that big engine) at 100+ mph. You'd probably gain just as much replacing the VAF with a MAF.
A VAF is a Vane AirFlow sensor. It is a spring loaded flag or plunger which measures how much it is pushed aside by the incoming air, and it reports this volume measurement to the ECU. The ECU must then combine this information with temperature and barometric measurements to determine the air mass that has been ingested.
Naturally aspirated means the engine is drawing air in on its own. With a compressor this obviously isn't the case. With NOS its a little fuzzier: the NOS is part of the combustion, plus it is cooling the intake air charge. This cooling effect tends to increase the density of the air charge, but the air is still being drawn in just by the engine. So I'd have to say that NOS is not forced induction, which means it is natural aspiration... unless you want to invent a new term to describe it.
i was under the impression that NOS isnt ignited, but enters the combustion chamber at a very cool temperature. the ignition of the fuel causes heat i.e. causing the NOS to expand at a high rate. im driving a built 93 MX-6 4-cyl (about 2.3L i think).
NOS (N2O) is a good carrier, by volume, of oxygen. When you spray NOS into the engine, the heat in the chamber during combustion dissociates the N2O, freeing up the oxygen. If you add more fuel, the freed oxygen oxidizes (burns) it, creating more power.
If you don't add enough fuel, you end up with a lean condition that causes very high combustion chamber temperatures and you also have free, unallocated oxygen that can oxidize things other than fuel: hot exhaust valves, spark plug electrodes etc. This is why you need to add extra fuel when the NOS turns on and why, if you don't, you can quickly wreck engine parts due to heat.
A second benefit is the very, very low boiling point of N2O. When fogged, it sucks a ton of heat from the intake tract making the charge density that much higher.
In my book, when you spray NOS, you are adding oxygen the engine wouldn't have ordinarily been able to obtain on its own. Not technically forced induction but not really normally aspirated either.
I know this is not a big deal, but unless your living someplace other than earth O2 composes 19-21% of the atmosphere, and even slightly higher very close to te ground (where our cars are "breathing"). Still the point was made 35% opposed to 20% Oxy is a great gain.
A forum community dedicated to Mazda MX-6 owners and enthusiasts. Come join the discussion about restorations, performance, upgrades, modifications, classifieds, troubleshooting, maintenance, and more!