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NOS, Just Like The Movies? | Nitrous Injection [TECH NUGGET]


– For anyone who's watched The Fast and the Furious movies, it may seem that nitrous is some kind of silver bullet to fix all of your power requirements However like any type of power adder, nitrous has its pros and its cons, and it's got its own set of complexities that go along with setting up a reliable system that's going to work well and deliver the kind of power that you need

While nitrous is a popular choice to add on top of a naturally aspirated engine, we're going to be talking about how nitrous can be used to help with a small capacity forced induction engine One of the key areas that nitrous is used is when an automatic transmission is coupled with a small capacity engine running a large turbocharger With the automatic transmission, at the start line it's important for the driver to be able to get the car up onto the two step limiter and this requires a certain amount of power to get the engine RPM up high enough in the rev range Often with a small engine and a large turbocharger there's physically not enough exhaust gas energy to spool the turbocharger at low RPM and produce boost and hence the engine will just sit there at low RPM, not reaching the two step limiter and not making nearly enough power to launch In these circumstances a realtively small shot of nitrous can be used just for the purposes of spooling that turbo

In this case we may be using a 50 to 100 horsepower shot of nitrous and it's only sprayed momentarily As soon as that nitrous is active, it increases the engine power, in turn it increases the exhaust flow into the turbocharger and this helps start producing boost from the turbocharger As soon as the turbo starts producing boost, it tends to continue So the shot of nitrous is generally only needed for a very short amount of time, perhaps a second or so Alternatively the nitrous spray can be used the entire way down the drag strip and here it's really adding to the power being supplied by the turbochargers

Now this is where it gets a little bit tricky though If we've got a turbocharger system on a turbo engine and that turbocharger system is really maxed out and working as hard as possible, you may think that if we wanna add another 200 horsepower it's as simple as just adding a 200 shot of nitrous to the engine It isn't however that easy because all of that additional oxygen that's being supplied to the combustion chamber, via the nitrous system still needs to make its way out through the exhaust system And when we've got a turbocharger system that's running at its absolute maximum, what we tend to find is that the exhaust pressure starts to build up between the exhaust valves and the turbine inlet for the turbo By adding nitrous, this simply means we get more back pressure and often if we add a 200 horsepower shot of nitrous, ultimately we may not see anything quite like that sort of gain in terms of engine power

That 200 horsepower shot of nitrous, on a turbo system that's absolutely maxed out, may for example only give us 50 to maybe 100 horsepower of additional engine power So as you can see, it isn't a silver bullet to fix your power woes We also need to consider how the nitrous system physically works And there are a mutlitude of ways that nitrous can be supplied to the engine First of all we break these down into what's referred to as a wet system and a dry system

When that nitrous is sprayed into the engine, we're essentially providing more oxygen straight into the combustion chamber However to achieve a safe air fuel ratio and also achieve the power that that nitrous system can provide, we also need to deliver additional fuel Now this can be delivered with a wet system where the nitrous jet provides both the fuel and the nitrous together Alternatively we can also have a dry system where the jet only supplies the nitrous and in this case we need to provide additional fuel via the fuel injectors This is a technique that's becoming more common with electronically fuel injected engines as we have a lot of control through the ECU and we can very finely tailor the fuel supply to make sure we get exactly the correct air fuel ratio

Beyond this, the nitrous can also be delivered via a direct port system, where we have an individual nitrous nozzle for each of the intake runners on the engine or a simpler system where we only have a single nitrous nozzle that's generally located in the intake system, somewhere before the throttle body Lastly we need to talk about nitrous purge systems You've probably all seen cars pull up to the start line in a drag meet and a spray of white nitrous comes up generally at the base of the windscreen Now this isn't all for show That nitrous purge system gives two functions

First of all it gives a visual indication to the driver that the nitrous system is active and it's ready to go More importantly though it purges gaseous nitrous out of the lines so that when the car actually leaves the line for the first time, a constant supply of liquid nitrous is available to the engine, improving the system's performance So there's a quick introduction to nitrous systems, and hopefully as you can now see, it's a little bit more complex than just fitting a 200 horsepower nitrous kit to your vehicle and expecting that that's the last you'll ever have to worry about it Just like a turbocharger, or a supercharger, it requires the correct system to be fitted, a good understanding of how that system will work and the correct tuning to make the most of it and ensure reliable engine performance If you liked that video, make sure you give it a thumbs up and if you're not already a subscriber, make sure you're subscribed

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Source: Youtube

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