What Is Nitrous (NoS), And How It Work

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Nitrous (or ‘NoS’ as most people call it) is nitrous oxide, a gas most commonly used as mild anaesthetic during dentist work and childbirth! But the car modifiers use it for making cars a lot more powerful!


On that note, many of you  might be surprised to know that nitrous is non-flammable. The reason it gives your car more power when injected   into the engine is because it contains much more oxygen than an equal amount of normal air doses. When mixed with corresponding amount of fuel it therefore results ion a considerable power boost.


So you can buy a nitrous kit from some companies and thanks to the great instructions you should be able to fit it yourself, but what the hell do all the bits do? Well let started…


Every kit includes:


  1. Arming Switch – having the nitrous on every time you put your foot down would be expensive and pretty dangerous. That’s why all kits come with this aircraft-style arming switch to install so the nitrous isn’t activated until you flip the switch and plant your foot!
  2. Activation Switch – Nitrous doesn’t just come on when  you flick the arming switch; that’d be almost impossible to drive and dangerous, too. Imagine reaching over to flick it on and having the car suddenly get a 150bhp boost in power – you’d be punted into the nearest tree. That’s why nitrous systems have a switch that’s attached to the throttle of the car, so you can activate the nitrous via the arming switch, but it isn’t until you hold tight, plant your foot to the floor, and away you go.
  3. Pulsoids – Pulsoids are basically the injectors for the fuel and nitrous. They work at the same way as traditional fuel injectors, with an electromagnet opening and shutting a plunger to regulate the fuel and nitrous levels. For ease of identification, the fuel pulsoid is anodised red, with the nitrous one anodised blue.
  4. Crossfire Injector – When the pulsoids fire, the fuel and air is injected down the hoses to this point, the crossfire injector, where they meet and are then forced into the engine as a ready-mixed fine mist to give the maximum boost for the amount of nitrous used.
  5. Jets – These are fitted into the outlets of both the pulsoids and regulate how much of the fuel and air is injected into the engine when you’ve got the nitrous system activated. They are very similar to carb jets, being small brass pieces with various size holes in them, depending on how much fuel and nitrous you want to inject. Kits generally come with 25bhp jets already installed, but once you have the system running safely you can upgrade to larger ones.
  6. Fuel-Tee – This T-piece is inserted into one of the high pressure fuel lines on the car, so that you can run a pipe from this to the fuel pulsoid. It’s vital that the T-piece is secured properly because leaking fuel is the last thing you want spraying round your engine bay.
  7. Pipes – These mega-strong nylon hoses are what carry the fuel and nitrous from the bottle to the pulsoids, and then from the pulsoids to the engine. These hoses are capable of holding nearly 1,500psi, so there are no worries about the pipe bursting, even with the huge pressures that nitrous kit run. As with the pulsoids, the red one is fuel and the blue is nitrous.
  8. Bottle – As you might guessed, the bottle is where the nitrous is stored. The construction is the same as all industrial gas bottles, meaning it’s capable of withstanding ultra-high pressures and is designed to be safe in the event of an accident. As with all gas storage bottles, there is a valve at the top of the bottle to seal it when not in use. The bottle works in a similar way to a normal household aerosol can, so works best when upright or tilted upwards at an angle, rather than laid flat.
  9. Brackets – These stainless alloy brackets are what hold the nitrous bottle securely into your car. The brackets are made at slightly different heights to each other so that the top of the bottle is always tilted upwards so that is the able to empty itself fully.

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