Any heads/cam N2O users - questions.

[Mad Max]

I just finished a heads/cam/headers install. I will be adding Nitrous either this summer or in the fall after I get the drivetrain in order. My big question is, what max shot would you go with - I am going to figure I am around 400rwhp now. If I went with say a 75 shot, would I need to upgrade my injectors and fuel pump too? Or only if I went with a 125 or bigger shot?
Also which system would be best - dry/wet. I am going to guess wet for the exrta fuel.

[Bad30th]

If you have stock injectors I'd go with a wet setup to supply the extra fuel. That's what I did, and I also upgraded to a Walbro 340 intank fuel pump.

You could probably run 75-100 with a dry shot but why chance maxing the injectors and running lean if you're pushing 400rwhp N/A...

Good luck !
Bad30th

[Black02SS]

I would suggest a wet kit. IMO, it is easier to tune and keep in order. I agree with Bad30th, it is always a good idea to get a intank fuel pump just so you know for sure you have enough fuel. If you haven't already, check out the FAQ at the top of the N20 forum. You say you are only going to spray a 75 shot, :lol:, sure you are. Been there done that.

[Mad Max]

Okay Black02SS, you got me on that one :D .... so bare minimum is a upgrade fuel pump. I know I'm gonna have to get a 12 bolt before I do this though :rolleyes:

[WS6TransAm01]

I have h/c and a 75wet. Did not need to upgread anything. On the 100shot on the dyno the fuel pressure looked fine so did the A/F. So if my gearing/tire sise allowed it would spray 100.

I would go with a wet shot and keep it light. 75 or 100. You will like the resuslts!

[Mad Max]

So no for a 75 shot, yes for 100 or better. Hmmm.....well, I guess if I gonna go with it, I'll probably opt for the bigger shot :D
BTW WS6TransAm01, did you get the AF tuned along with the head/cam tune? Or did you tune for NA?

[Black02SS]

Originally posted by Mad Max
So no for a 75 shot, yes for 100 or better. Hmmm.....well, I guess if I gonna go with it, I'll probably opt for the bigger shot :D
BTW WS6TransAm01, did you get the AF tuned along with the head/cam tune? Or did you tune for NA?

On a wet kit you tune the car N/A and then can adjust the a/f ratio when you spray if needed by a larger/smaller fuel jet. So much easier then a dry kit IMO.

[X1BadWS6X]

I have a TNT F1 Kit on my car, and cam only I'm at 403/378 rwhp and tq motor. My injectors are running at 97% I have a intake pump, and run 100oct on the bottle. But I am getting new injectors. I don't want to run that high. This is on a 150 shot. I have ran a few bottles, and my car is still running good, its been tested. But I think everyone does what they feel they think is better. My car is tuned also... I guess as long as you have a fuel pump, and injectors you should be good to go as long as the car is running right motor. :)

[WS6TransAm01]

Originally posted by Mad Max
So no for a 75 shot, yes for 100 or better. Hmmm.....well, I guess if I gonna go with it, I'll probably opt for the bigger shot :D
BTW WS6TransAm01, did you get the AF tuned along with the head/cam tune? Or did you tune for NA?


My tune was done for H/C NA. The nitrous kit went on over a year after the H/C were done. I got bored running low 11's lol. There was NO tune for the juice. The only thing I have is the timing retard. As soon as I arm the nitrous system my timing goes back 4 degrees. That was all. All I changed on the car was plugs [TR55 --> TR6] and the timing retard mod.