So, I know most of the information that I would need to know is available on the net, but I figure this section could use some discussion.

We're building a 300zx, twin turbo.
The idea is for it to be a "daily driven race car" simply put.
So we're building the engine to make about 600 whp. Too much more than that and it gets rough to drive everyday and it gets much tougher to turn the boost down for rainy days.
Anyway, so at 600 whp, it'll be quick, but not as fast as we'd like.
So I threw the idea of adding nitrous to the mix.

Now, I've only done some brief research, but I'm already finding conflicting information.
some places say that you can add nitrous, but only small amounts, and not with much boost. They say there is too much heat and the cylinder pressures would be too high.
Other places say you can strap as big of a shot on it as you want, regardless of boost levels, especially if the engine has forged internals, which this engine will.

So...

Can you use nitrous with a build like this one?

If so, what kind of set up can you use?

How much power can you "strap on" ?

What are the cons of adding nitrous to the mix?

Is there a difference between what is safe for once in a while versus "daily" use?


Any other tips, advice, info?

 

i my self am fully forged internals crank rods pistons arps all the way through and cometic gaskets...ive got an eaton m90 blower witch causes alot of heat and cylinider pressure increases... i am intercooled and have water wetter running through it and also running 50/50 meth ... plans are for a 75shotwet and a dry 25 all the time when running... have done alot of reasearch and if used approp and tuned correctly there will be no issue... main thing to watch is detination and knock... might try a small shot and work your way up to what is suitable just keep and eye on afr's and knock and go from there...

 

yeah, we're not doing meth. we're not looking to build a drag car. We'd do it differently if we were.
but the fact that you're supercharged and using nitrous is assuring.

What do you mean, "all of the time when running"
so you're just spraying a small amount non stop?
I'm assuming this is a weekend, track only, one run at a time car huh...

I know it has to do with the tuning. It always comes down to the tuning.
the part that I'm curious/worried about is if we could "strap on" 200 more whp or if we would be stuck with a smaller 100 or less shot?

How does the nitrous shot effect cylinder pressures?
How would it relate to increasing the boost?

I see how the start small and work your way up would work. and if it was just me and I was just trying to squeeze some more out of it, that's how I would do it, but since it is a "we" and we are trying to build this car/engine to do what we want it to do, we're trying to figure out exactly what needs done to accomplish it. Assuming it is even "accomplishable"
There has to be a way to actually calculate it.
Know what I mean?

 

You got it all wrong.

First..
What you dont mention is "octane" you'll be running. meaning if you think you can run 600 WHP then throw some juice on it.. there better be great gas in it. Not junk 93 but 110-116.

Second..
You say 600 WHP. That will happen at X amount of boost. Lets say 28 PSI. Why not get an electronic boost controller and turn the boost down to 18. Now it runs around at 450 to the wheels. You want 600.. push a button.. your back at 28 and can get your number.

Third..
Octane is the limiter. Most do the meth so they can drive around on 93 and when the motor goes up on boost can spray the meth to stop the detonation. On a track only car, why would you use methanol when 110/116/121 octane fuel can be used for the one hit wonders.

Dont think you can run 30 PSI, high timing, make big power and do it on 87 octane. Aint gonna happen.

 

Just realized this post was from April.. way to bring up the dead