It may be a stupid question but me and a guy at work got in an arguement about it. He says that to judge the amount of nitrous to use in a shot you take 30% of your horsepower and that it will be fine. This makes no sense to me cause you can have a block rated at 550hp and have 500hp. So a 30% shot would be a 150 shot. So that would be like pumping 650 hp through the engine and he thinks it would be just fine. I don't know if this makes any sense to anyone else but has anyone heard anything like this. I just wanted to ask before I continue to call him a dumbass.

 

I think it's too general. Put that much on the wrong motor and it won't make it very long. On other motors, you'd be able to go much further. RELIABILITY would be the key word.

 

That's what my big point was. That that could make perfect sense if your motor was built for it. Not if it was just a stock engine.

 

I've read that a general rule of thumb for stock motors is approximately 20hp per cylinder. I.E. 4cyl=80, 6cyl=120, 8cyl=160. I can't remember where I read that... I know it was in one of the N2O companies' FAQ sections. For "built" motors... Well, I guess it just depends on how "built" it really is.