NOS FAQ

What is NOS?

NOS or Nitrous Oxide (N2O) is a non-combustible chemical compound that was discovered by the British chemist, Joseph Priestly, in 1772. It consists of two Nitrogen atoms and one Oxygen atom. It does not occur naturally but is a manufactured compound.

No. NOS is not flammable but it releases oxygen that allows you to increase the amount for fuel burnt in the combustion process.

NOS is not combustible but allows for more fuel to be burnt during the combustion process. When NOS is in a canister or bottle, it is in a pressurized liquid form. When it is released into the combustion chamber the pressure is removed and it becomes gaseous. Then, when the NOS reaches temperatures of about 572° F (302° C) it breaks down into oxygen and hydrogen, releasing extra oxygen that allows your engine to burn more fuel and create more power. In addition, the chemical process of converting from a liquid form into a gaseous form absorbs heat from inside the combustion chamber, creating even more power while reducing the chances of detonation and pre-ignition. Finally, the nitrogen that is also released acts as a "buffer" during the combustion process and allows a more controlled flame front during the combustion process.

The major advantage of NOS is that it offers the best returns in terms of horse power (hp) per dollar spent when compared to any other forms of performance modification. In addition, there is relatively little work involved in installing a NOS injection system while the installation process is fairly straight forward. Furthermore, NOS systems can be applied to any car and can easily be removed and transferred from one car to another.

The disadvantage of NOS is that you must refill your NOS tank. Unfortunately, NOS refills are not as freely unavailable as gasoline and can only be purchased from an authorized dealer. Furthermore, NOS is not street legal in some states any might only be used in sanctioned motorsport events.

Yes. Any increase in power results in increased load on engine components which will lead to greater wear. Bolt-on NOS kits are usually calibrated for specific applications with lower hp systems for stock engine application while higher hp systems will require additional engine modification work.

No. The NOS system has its own fuel injectors that operate independently of your existing fuel injection or carburetor fueling system.

No. Most current ignition systems are suitable for the use of NOS injection. However, in high hp applications it may be advisable to replace your stock ignition system with a high quality high output ignition system.

Not really. Detonation is caused by too little fuel in the air/fuel mixture or too low an octane level for the level compression pressure resulting from your engine of modifications. Having said that, NOS does lead to higher combustion pressures but the Nitrogen that gets released into the combustion chamber acts as a buffer and results on a more controlled combustion process. This however, does not mean you can advance your ignition timing when using NOS.

No. NOS systems are designed to supply the optimal air/fuel mixture and exhaust temperatures are usually well within acceptable tolerance of the catalyst. Thus NOS should not affect the converter.

Yes, you can get a NOS kit for almost any stock engine application. However, you need to choose a kit calibrated for your engine. Generally speaking, a stock 4 cylinder engine can handle an extra 40 to 60 hp, stock 6 cylinder engine can handle and extra 75 to 100 hp, a stock small block V8 for up to 400cid can handle up to 140 extra hp, while a big block V8 can handle between 125 and 200 extra hp without requiring additional modification work to the engine. However, these are just general ranges and differ from engine to engine. It is thus best to speak to your supplier about your specific needs.

Most NOS kits can be installed in approximately 3 to 5 hours. The NOS kit should come with an instruction manual with installation drawings, wiring diagrams, and bottle mounting instructions, as well as a trouble shooting guide. If not you could follow our installation guide.

You can hold the button down until the bottle is empty but it is recommended that you only hold it down for a maximum of 15 seconds at a time.

It is best to use NOS only at full throttle or wide open throttle unless you are using a progressive controller. Due to the tremendous increased in torque, you will generally find best results with early activation at full throttle in second gear from above 2,500 RPM.

A 125 hp NOS kit with a single 10lb canister should last for 7 to 10 quarter mile runs while a 250 hp kit will halve the number of runs to 3 to 5.

Generally, when there is about less than 20% of NOS left in the canister. When there is less the 20% NOS left in the canister you will experience a surging effect as there is too little pressure left in the canister for effective delivery.

The best way of determining how much NOS is left in your canister is to weigh the canister. Generally, an empty canister weighs about 14 lb but there should be a stamp or label on the canister that displays the empty canister weight. Determining how much pounds of NOS are left is thus just a matter of subtracting the empty canister weight from your reading on the scale.

For optimal running conditions, approximately 800 to 900 psi is the best canister pressure. This pressure is usually reached with ambient temperatures of between 70° F (22° C) and 90° F (32° C). The NOS canister should also have a pressure gauge that will allow you to monitor its pressure.

No. Cooling the canister will lower the NOS pressure and will result in a lower NOS flow rate causing a fuel rich condition and reducing power output. Generally, an ambient temperature of 70° F (22° C) to 90 ° F (32° C) results in the optimal canister pressure.

To ensure that the siphon tubes maintain a proper NOS pickup, it is important to mount the canister at a 15 degree angle with the valve end being elevated. The canister should be installed with the valve end facing the front of the vehicle and the valve knob and label should face straight up.

You can refill your canister at any authorized NOS distributors. Most performance shops are authorized distributors. When refilling your canister you should not overfill the canister. If you have a 10 lb canister you should not fill it with more than 10 lb of NOS by weight.

If you have a 10 lb canister you should not fill it with more than 10 lb of NOS as the pressure in the canister will be too high. This will cause the blow off valve to break open and release all of the NOS in the canister. The NOS canister has a pressure gauge that allows you to monitor the NOS pressure in the canister.

The blow-off safety valve is a pressure release valve that will prevent the canister from exploding when the pressure in the canister is too high. This can occur when the canister is overfilled or when the canister becomes too warm. When this happens the blow off valve will open and release the contents of the canister. Fortunately, the NOS canister has pressure gauge that allows you to monitor its pressure.