Hey everybody,
I just have a question about why nitrous makes soo much tourque?? Why does it make so much tourque for a givin horsepower shot? For example, why would a supercharger making 375hp make aproximately the same tourque, maybe a bit more, and a nitrous shot of 150hp making 380hp make approximately 460tq???

Any insight would be great, I'm just a little curious.

 

Basically, nitrous systems make large amounts of torque by allowing an engine to burn more fuel at a lower rpm range than normal. That little extra fuel that often gets unburnt and spit out the exhaust would be more likely to ignite. Burning more fuel this way creates a longer burn period (and slightly higher cylinder pressures, if the timing is not corrected), that will push down on the pistons with greater average force. And pushing down on the pistons with greater force will give you that increase in torque.

 

That makes a little more sense to me now. Thanks alot, so we get added tourque with superchargers down low the same way, just not as much fuel is addedas withnitrous....is that acorrect statement? Or is it that we get a more efficient burn in the cylinder with the n2o oxidizing the fuel than we do just compressing more air and adding more fuel as with a supercharger??

 

Kind of.... But you won't always get a burn that's as nice or as complete with a supercharger. Especially if there's a big gap and crappy ignition system or plugs. Superchargers by nature will also heat the air resulting in higher air charge temps. That will result in a slight loss of power (hence the reason for an intercooler.) Nitrous, on the other hand, typically cools the intake charge.

To get more power, you want to burn more fuel. But you can't just add fuel. The only way to burn more fuel is to add the correct amount of oxygen as well. So the object is to add more oxygen to the cylinders so that you can add more fuel to burn, and thus create more power.

A supercharger works by forcing more "air" into the cylinders. It forces the air in by compressing it so that it can squeeze more into a limited amount of space. Then it adds the extra fuel, ignites the mixture, and gives you the power you're looking for.

With nitrous, you're not compressing outside air. But you still need to get extra oxygen to the cylinders. Nitrous contains a higher content of oxygen than air. So when it is sprayed into teh cylinders, you're actually getting more oxygen in there as some ordinary air get's displacd / replaced by the nitrous. The nitrous also cools the air slightly, which increases density and helps get a little more air into the cylinders.

Both superchargers and nitrous basically increase power by making sure there is enough oxygen to compnsate for the extra fuel that is dumped into the cylinders. They just use two different approaches to reach this goal.

 

Stop adding stuff after i start to answer [8D]

Typically, you do get a mroe efficient burn with the nitrous as opposed to a straight blower. Compressing the air and adding more fuel raises other issues that can make it lose some efficiency. Like the increased difficulty in igniting the mixture in a pressurized cylinder, the increase air charge temps, etc.

 

NOS is like a hot chick with an STD. You wanna hit it but you're afraid of the consequences.


that is the funniest **** i have read in a long time

 

Well that's how I feel everytime I re-jet my setup, LoL. I wanna hit it so bad. But I'm scared ****less that I'll regret it down the road... literally [8D]

 

How big a shot are you running now sam? Have you done any work to the engine or is it still a stock block?

 

there is always med's.(built motor).

 

Stock block until she dies. Then I have a spare short block in my basement, LoL. I just have to decide if I want to go 347 or 351 at that point. Haven't decided yet.

I'm running a two stage setup right now. And the first stage is what scared me the most, lol. The first stage is roughly a 50HP dry shot (roughly because it changes with air temp, boost, etc.) The dry stage nozzle is placed about 16 or so inches before my MAF. So when it sprays the nitrous sprays across the MAS. That "chills" the MAS making the car think that more air is coming in, therefore it adds more fuel to compensate. So in the end, nitrous is added and the extra fuel is added without spiking the fuel pressure. It works out perfectly, but you'd better believe I was scared ****less when I first sprayed it. I didn't know how long it would take for the computer to compensate for the shot of nitrous hitting the MAF.

So when I firet tested it, my eye were pratically glued to my laptop screen monitoring the A/F ratio. Much to my surprise, it never went lean at all and the AFR was right where I wanted it to be.

The second stage is just a standard wet shot mounted after the MAF. It's 100 - 110 HP depending on the conditions again.