Nitrous Oxide (NOS)

Why would you want to put nitrous oxide injection in your car?

Because it's the easiest, most powerful and cheapest way to produce horsepower!
I get a lot of emails with questions about nitrous, "what's nitrous?", "how does it work?", "will it blow up my engine?", "how much does it cost?". The purpose of these pages is to answer questions like this, my goal is to have something here for everyone, from complete beginners to experienced nitrous heads.
The main reason that people want to put nitrous in their Miatas is that they want some extra power now and then. They don't want the high cost and complicated installation of a turbo or supercharger kit. Or they are complete power junkies like me and want the nitrous on top of the turbo!
These are all very good reasons to get a nitrous system!

"Is it complicated to install?"
A nitrous system is easy to install, you mount a bottle in the trunk, you route a small tube from the bottle to the engine compartment, you mount a few small things under the hood, you install an injector in the intake, you make a few electrical connections and you're done! That's all there's to it.

"How can this stuff make hp?"
Simplified you can see nitrous oxide as "Super air", it's just like air but with more oxygen in it. Engines produce horsepower by burning fuel, that means that the fuel (usually gasoline) reacts with the oxygen in the air. Nitrous oxide by it self doesn't give you any more hp, just more oxygen. The trick is that with more oxygen you can burn more fuel and thereby produce more hp!

"How do you use it?"
Some people think that you flip a switch and then the nitrous (and extra fuel) is flowing and you just hold on for dear life. That is not how a modern nitrous system works (or should work). The system actually contains three controls, the first one is that you have to open the valve on the bottle (usually in the morning and then you close it at night), the second one is an arming switch mounted somewhere in the cockpit. Unless that switch is on, nothing will happen under any condition. The third switch is usually mounted under the hood, next to the throttle. It's a small micro switch that closes (meaning it's on) when you push the gas pedal to the floor, it only activates when you have wide open throttle (WOT). When all these three controls/switches are "on", the nitrous and the extra fuel is injected into the engine. This makes a modern nitrous system very safe, if something isn't right (engine doesn't sound right, tires are spinning too much, the cops are approaching, ...), just release the gas pedal as you normally would and the nitrous will instantly be turned off. It can't be much simpler than that, every condition except WOT and the car will behave as if it has never even heard of nitrous, but push the load pedal to the floor and you'll have the ride of your life!

"Can the engine really handle it?"
Mazda GTX 1.8L engines are very tough, it was originally designed as a turbo charged engine and can handle a lot of hp. "But nitrous isn't the same as turbo?", No it isn't, but most of the things that makes a good turbo engine also makes it a good nitrous engine. If you want to make a career at the drag strip, you will have to make some serious engine modifications (just as if you would use a turbo), but if you want an extra kick in the back when that pesky Wira Turbo's is pestering you, the stock engine is just fine.

"Can I abuse the engine as much as I want to?"
No you can't. There are certain rules you have to follow if you want to live a happy nitrous life. The first thing you have to think about is, NEVER EVER let it run lean. A lean condition (meaning that there is not enough fuel for the available oxygen) is very destructive to an engine and especially when you're running nitrous. The temperature in the cylinder gets very high and the fuel detonates instead of burns. The probable outcome is melted pistons, burnt valves, blown head gasket, cracked head or other unpleasant things.
The next thing is, don't try to force your engine to do things it doesn't like. If you have a turbo or a supercharger or even nothing at all, it will not make much power at low rpms. Put in 5'th gear and slow down to 1000 rpm, now push the pedal to the metal and the car will start to accelerate, very slowly, because the engine doesn't produce much hp at that speed. Nitrous is completely different, as soon as you hit WOT (with the system armed) it will inject a fixed amount of nitrous and fuel. It doesn't care if the engine is at 1000 rpm or 7000 rpm, it will do the same thing. If you have the nitrous system set for 50 hp, it will add 50 hp even if the engine is at 1000 rpm. Since the system injects a fixed amount regardless of rpm, the lower the rpm, the more nitrous will burn per power stroke. At low rpm's that creates a very high cylinder pressure and can cause problems. The solution is simple, don't engage the nitrous (i.e. no WOT) at too low rpm. "How low is too low?". It depends on how much hp the nitrous is set for and which gear you are in. If you have a 50 hp setting, don't engage under 2000 rpm in 1-3 gear and not under 2500 rpm in 4-5. For a 75 hp setting increase each with 500 rpm. "This sounds dangerous!". No it isn't if you keep it in mind. If you feel that you want some extra security, it's easy to put in an rpm-switch that will block the nitrous until a certain rpm is reached.
The third thing you should think about is, don't hit it too long. It's the same thing as with turbo or supercharger systems, when they produce this wonderful power they also generate a lot of heat. Don't push the pedal to the floor and keep it there until you reach the rev limiter in 5'th. Long hard pulls generate a lot of heat and pistons and valves are sensitive to that. If you want to see how fast it goes, push it 99% (just before the nitrous engages) until it doesn't go any faster and then engage the nitrous.
One last thing, DON'T EVER engage the nitrous unless you are in gear with your foot OFF the clutch. Don't even try just to see if I'm right, your engine will reach 10000 rpm before your next heart beat and the result it NOT pleasant.
And related to that, if you are tinkering under the hood, keep the nitrous unarmed. If the engine is running and you accidentally engage it, see above. If the engine isn't running and you accidentally engage it, don't even think about starting it, even if you "hit" just for a millisecond. Unscrew your spark plugs and crank it for a long time.

APT do a lot of installation and tuning on Dyno for Turbo and NA engine,Pls contact for more information.

Price for NOS

Basic Dry Set,Toggle switch,Bottle 10 lb,Jet spray,Solenoid,Fitting and Nozzle  RM2500

Basic Wet Set,Toggle switch,Bottle 10 lb,Jet spray,Solenoid,Fitting and Nozzle  RM2900

Basic Dry Set,Toggle switch,Bottle 2 lb,Jet spray,Solenoid,Fitting and Nozzle  RM2350

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