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View Poll Results: Do you think nitrous falls under FI or NA?
FI 31 68.89%
NA 14 31.11%
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Old 05-13-2009, 07:45 PM   #1
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Nitrous: FI or NA?

The debate came up in the duratec performance chat. Do you think Nitrous Oxide falls under FI or NA?


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Old 05-13-2009, 07:56 PM   #2
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I was going to say more NA but by the definition I’m going with FI

Nitrous oxide is made up of 2 parts nitrogen and one part oxygen (36% oxygen by weight). During the combustion process in an engine, at about 572 degrees F., nitrous breaks down and releases oxygen. This extra oxygen creates additional power by allowing more fuel to be burned. Nitrogen acts to buffer, or dampen the increased cylinder pressures helping to control the combustion process. Nitrous also has a tremendous "intercooling" effect by reducing intake charge temperatures by 60 to 75 degrees F.
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Old 05-13-2009, 08:00 PM   #3
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Actually, I guess it would depend on whether it's a wet shot or dry shot. Nice definition Brian.
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Old 05-13-2009, 08:25 PM   #4
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Wet or dry doesn't matter. If it is Oxygen added to the system that the motor can not naturally pull in, it's FI.
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Old 05-13-2009, 08:25 PM   #5
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It may allow more fuel to be burned but you aren't "forcing" anything more into each cylinder. The motor is still only sucking in a max of the surrounding atmopsheric pressure whereas in a true FI setup (turbo or supercharger) you are forcing additional volume above atmospheric pressure into each cylinder. This is why its called forced induction because you are forcing more air in. NA volumetric efficiency can vary going from car to car as some heads will flow a bit better, or a set of cams will allow for a bit more valve overlap than others. This doesn't change with nitrous, you are just allowing more fuel to be burned within the cylinders which does increase cylinder pressures, but does not in eccence stuff anything more into the cylinders.
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Old 05-13-2009, 10:56 PM   #6
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nitrous falls under the FI category. it doesn't matter if you have a wet or dry kit on it, it is the same dam thing.. think of it as a bottle turbo....
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Old 05-13-2009, 11:23 PM   #7
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Nitrous is FI. Go racing in a NA class on the bottle and see what happens
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Old 05-13-2009, 11:32 PM   #8
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It may put you in another class but that doesn't mean in any way it is technically a forced induction application. With an NA application you are relying purely on the pressure differentials beween the cylinder and the outside atmosphere to fill the cylinder. Why do you think the same car will make slightly less power in the mountains of Colorado than it would in Seattle at sea level? NA with nitrous involved relys on exactly the same principle of pressure differentials. You are just adding something to the mix which allows more fuel to be burned and thus more power. You aren't "forcing" anything extra in there. The cylinder will still only accept the same amount of (for lack of a better term) stuff and you cannot change that without some sort of mechanical advantage such as a turbo or a supercharger.
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Old 05-13-2009, 11:49 PM   #9
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... or a chemical additive that contains more Oxygen that the intake air. Atmospheric pressure can only put X grams of O2 into the chamber, NO2 adds Y to the already X mixture. So anything atmospheric pressure can not put into the cylinder is forced induction IMO.
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Old 05-14-2009, 12:08 AM   #10
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I agree, when you push on that button (whether it's behind the pedal or on the wheel) you're "forcing" something other than the naturally aspirated air into the engine. Therefore, IMO it's classified as FI.
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