I am going from a stock 346 to something around 396 to a 408...Will the Hp my current shot puts down change with the increase in cubes?

 

I really dont know the answer to that. I know I picked up alot of HP on the exact same shot when I went for a medoicre heads and cam, stock bottom to a purpose built 383. But I feel that was more a function of cam and heads.

So...I think that if everything else stayed exactly the same (cam and heads and headers) and all you did was increase ci...I would say things would probably stay about the same, or depending on the exhaust capabilty...even decrease the gains.

Id like to hear more discussion on this.

 

excellent questions . . .I hope the big dogs chime in . . .

 

Just out of curiosity.....does a 4cly take the same amount of juice to make 100hp as a v8?

 

No matter what the engine size the jetting will stay the same, a 4 cylinder will use the same nitrous jet as a 8 cylinder to make a given horsepower. Changing heads, cam, or even motor size may use the nitrous more efficently giving you more power, but will still be around the same.

For example check out this NX Jetting Chart and notice how the nitrous jets stay the same
http://www.nitrousexpress.com/Instru.../gmjetting.pdf

 

where are you nitrous dave? What do you have to say about this?

 

Although jetting will stay the same for a given "shot" of nitrous each engine will differ in how effeciently it uses the nitrous. For example, with my old heads and cam setup (cam and portwork specifically setup for nitrous) the car picked up 225rwhp from what should have been a 150 shot according to the jet pattern from NX. When the car was bolt-on only it picked up about 95rwhp from a 100 shot.

As for engine displacement, I don't think that has as much to do with jetting vs. hp levels as how the heads and cam are setup.

 

Ok,
Lets start by talking about what makes HP.
The more Hp you make is determend by how much more fuel your motor can burn.Every mod you do such as heads, cam, intake, throttle bodys etc is done so you can flow more air.The more air you flow the more fuel you can burn.The same thing with nitrous.All nitrous is for is so you can burn more fuel.On a better flowing motor you will see a better out come with the same size jets that you will use on a stock motor.If you take one motor that is stock and take another motor that has heads, cam, headers etc.More than likely the nitrous will make more power with the same size jets that you used on the stock motor.Thats why most heavily modded cars need a little tweeking on the tune up of the nitrous set up.
So the answer is you are building a larger cubic inch motor so you can move more air flow,So you can burn more fuel..Yes your nitrous tune up may change.
I hope I explaned this the way I ment for it to sound.
Dave