I am trying to figure out how much nitrous that you can spray on an engine that makes xxx horsepower. I have heard that you can only spray 75% of what your engine makes. For instance if I had an engine that made 400 hp at the crank I could only spray a 300 shot on it. From what I understand the engine just cannot ingest any more nitrous than that. I was curious what everyone else's view on this is. Thanks for any input.

 

I have always been told you can spray up to 50% of your N/A horse power on a built/forged internal motor.

 

There is no such formula.
I have been spraying a 450 shot into a motor that only makes 289.

 

Robert, Dave? Any input on this?

 

Holy crap!!!

 

Anyone else????

 

Nobody? C'mon, someone has to know the truth about this. Can I spray a 600 shot on a 500 horsepower motor or not?

Not that I would really do that, I just wanna know if there is a certain formula for nitrous per HP.

 

There are way to many factors like:

If its an LS1 head lift becomes an issue regardless if its all motor or motor/N20. What type of head gasket is used, stock or forged pistons, size of ring land, cyl wall thickness, etc, etc, etc. And the obvious stuff like, fuel supply, correct plugs and timing, tune and so-on.

Small blocks blow-out main caps. Put billet splayed caps in and you can run more.

If its a ford, your pretty much screwed from the start...j/k

So yes, you can definetly spray 600hp into a motor that makes 500hp, as long as its built for it.

Trust me there is no rule-of-thumb that works for all motors.

 

Vinny, Answered it best.
There are to many factors in every application to come up with a set HP.
THe build quality on the motor etc all play a roll.
Dave

 

I realize that the motor has to be built well enough to witstand it. I was mainly wondering if there was any limit to the amount of nitrous an engine can ingest.

 

Yes there is going to be a limit to how much nitrous you can physically fit into any given engine. But like others have said there are far too many factors to say that x engine can only fit y amount of nitrous in to it. The type of nitrous kit can play a part as well; a direct port will usually be able to get more into the engine than a plate. Location of the nozzle and type of nozzle as well can affect the amount that can go in. When NOS was working with TRD to get one of Craig Paisley's engines set up they managed to make an 800hp V8 make 1600HP on nitrous. The reason this was possible was due to where the nozzles were placed. Due to where they were placed the bigger the nitrous jet they put in the more air was actually being pulled in to the engine.

So as you can see there are many things that can effect just how much nitrous you can stuff into an engine. It seems that in my experience that small blocks tend to start hitting a wall around 40-43 jets in foggers which is about 400-550hp and big blocks around 44-46 jets which 600-800 of nitrous. Now once they get into the 45+ jet range it is hard to say if they are using all of the nitrous or not. Like I said these are just the averages of what I have run into there will be some setups that will do more and some will do less.

 

Thank you, that is the kind of answer I was looking for. From what I was told you can only squeeze so much into an engine. I realize every engine is different and it would have to be setup properly.