Wet nitrous kits is an often used as an abbreviation for the nitrous oxide. Dry-flow intakes are designed to contain only air, which will travel through smaller pipes and tighter turns with less pressure, whereas wet-flow intakes are designed to contain a mixture of fuel and air. Also referred to as NOS.
A single-point nitrous kits introduces the fuel and nitrous together, causing the upper intake to become soaked with fuel. In carbureted applications, this is typically accomplished with a spraybar plate mounted between the carburetor base and the intake manifold, while cars fitted with electronic fuel injection often use a plate mounted between the manifold and the base of the throttle body, or a single nozzle mounted in the intake tract. However, most makes of nitrous kits combined with unsuitable intake designs, often result in distribution problems and/or intake backfires. Nitrous kits tend to produce more power than dry kits, but in some cases can be more expensive and difficult to install.
The term NOS is derived from the initials of the company name Nitrous Oxide Systems or kits, one of the pioneering companies in the development of nitrous oxide injection systems or kits for automotive performance use. The term was used prominently in the film The Fast and the Furious, and not surprisingly, shortly after the film's release, various automotive newsgroups and forums featured unprecedented numbers of inquiries about "NOS" and how to install and use it.
Newer nitrous kits on domestic cars have become increasingly easy to install by pulling fuel via the schrader valve on the fuel rail which is normally designated as a fuel test port. It makes plumbing and using a these nitrous kits much more simple.
- A nozzle differs in the way that it takes in both nitrous and fuel which are metered by jets to create a perfect or proper air-fuel ratio (AFR).
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