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ok, for this threads sake, lets talk about shooting a 170 shot of hp into a d17 stock block through nitrous. cause since i mentioned turbos its been nothing but. i keep reading about it and i wonder when the nitrous part will come in. i still say something will blow from a 170 shot into a stock block. someone please prove me wrong or right. and if i am right i will say i told you so.

 
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Bottom line, if you have the added cylinder pressure, no matter what the source, as long as you have the fuel and the timing in the right places, you can do it. There's no way that I can add 150 at the wheels and not blow it, but because "it's nitrous" it definitely will.

I remember requesting that if someone wants to make a debate about something to please post fact or reason to back it up. Just because "I think" this will happen doesn't mean a it will.

 
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Sorry, I dont have motor facts
I'll talk about d17 intake mani, wich is plastic.
When applied, NOS changes molecular characteristics of a material.
NOS is a cold gas, that will be applied to a hot surface (plastic intake mani).
Plastics cant carry that much of tempreture bounce, compare to metal.
So it can crack...
Turbo on teh other hand is just pressurised air doesn have any thermal impact on the plastic mani.
To conclude, stock mani (unlike yours Andy) wont be able to go as far with nos as with boost.
Again, this is just what I know from reading and not from doing.

 
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However, if you have a direct port nitrous set up, I don't think you'd have to worry about the plastic manifold.

I also think the instant "hit" of the nitrous would cause problems hindering how much you could use. However, with a progressive controller, you could also solve that problem.

 
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I think that's pretty accurate. A 150 shot directly into the tb is not smart. But as stated above, direct port would be a given. As far as the manifolds go, people I've seen that break their intake manifolds aren't due to the size of the shot, but backfires due to lack of timing tune and fuel.

 
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i kind of agree with this then. lets say instead of 1 170 shot, and i say 170 cause out motor is 127 stock. idk if you have other mods so ill assume you mean stock car.
127 plus 170 direct port. instead of 1 if you divide it into 4 different shots or by any number it might make a difference.
basically 2 bottles of like 80 or something, with 2 seperate triggers. thats still alot anyway though. if you split it up its more believable.
and you would think the clutch would burn as soon as you press the 170 shot

 
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you guys are also forgetting the fact that nitrous injects a specific amount of nitrous/fuel mixture at a constant rate. If it is a 150 shot, you are getting a 150 shot whether you are at 1000 RPM or 200,000 RPM. The cylinder pressure is astronomical when you squeeze it at a low RPM.

Lets say a turbo increases your horsepower by 150 whp at 10 psi. Even if you make that 10 psi at 2000 rpm, your cylinder pressure will be nowhere near that of a 150 shot of nitrous at 2000 RPM.

As your RPM increases, the amount of air required to make that 10 psi also increases. So if you were to take the amount of air needed to make 10 psi at 7000 rpm, and shove that into the motor at 2000 RPM, you would probably have close to the same cylinder pressure.

Also, nitrous is an instantaneous boost in power. It really is like hitting the tops of your pistons with a hammer. Turbos gradually increase the power. There is no shock factor when dealing with turbos.

Ever notice that cars on nitrous make waaay more low end and mid range torque that those with turbos? It is because the nitrous doesnt actually add horsepower. It adds torque. That torque is then converted into horsepower through a mathematical calculation. If you look at the dyno graph, the increase in torque is almost uniform throughout the entire dyno graph. If you take the torque graph of the car NA, then subtracted that from the torque graph of the car using nitrous, you would have an almost straight line.


Comparing nitrous to turbos is dumb. It would be like comparing neurosurgeons to endocrinologists. Sure theyre both doctors, and sure they both help cure people. but the way they do it is completely different

 
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this is why i was saying a piston would crack... or something would go out

 
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Well put!

I would not consider doing that large of a shot unless you had a quite well tuned EMS. Nitrous is so unpredictable with respect to distribution too. You may have some cylinders that run super lean and other run pig rich. I would also recommend individual EGT ports for each runner, a great tune w/ individual fuel and spark management too. I would venture to say the plastic IM on the D17 will probably burst too. It is not designed to be a 'wet manifold'. Not worth it IMO.