So I finally got my nitrous system working (TNT F1) and got to test it out today. I'm only hitting a 100 shot, I'm pretty good on power NA and have stock bottom end so I don't want to go to big. Good thing is, its working and I'm rich not lean which is better. But now I need to figure out how to lean it out some. I have a dynojet wideband and its pretty accurate to monitor my A/F's. Now with about 800psi bottle press I was at 10.5 average with sometimes a little lower like 10.2 and sometimes a little higher like 10.8 but averaging 10.5 or so. Could I use a smaller jet for fuel jet or perhaps a bigger jet for the spray, if so which one would be better to use. TNT uses a . I used .31 for spray and .18 for fuel. Also will the bottle psi affect my A/F a lot. I have a heater but was using a buddies bottle and the relay hook up for my switch. Anyway, I have 42lbs and a 255 pump is it possible I'm just delivering to much fuel? I see about 13.0-13.3 NA on AF at WOT. I have an elec fuel press gauge but the fitting broke for it so I donut know my psi right now. Just need some advice for what I should do and what A/F should I try to shoot for. I was thinking mid 12's are good, if not I want what is safest for my block. It felt good but I now it will fill way better with it leaned out some. Thanks for any tips or advice.

 

For starters, I would get appropriate bottle pressure. Most kits recommend around 1000-1050 for pressure. Just an increase in pressure will lean out your car. If it still rich once you have the right pressure, decrease the fuel jet size until you get it dialed in to where you want it.

For the Air Fuel, in the 12's is a little on the agressive side. I would shot for around 11.5 to 12.0. And then depending on bottle pressure and certain situations, it will fluctuate a little.

 

I agree try to shoot for mid to high 11s. You def need to get that bottle pressure up. when i was on the dyno it was so cold i had trouble getting my bottle to 800 psi too but i was too lean so get that bottle pressure up then look at your afr and work from there.

 

OK, well I just realized Im shootig a 75 shot, I had it set up for a shot before but I put it to a 75 shot since Im making pretty good NA power. I may up it to a 100 shot down the road, bitch should fly! Im on stock rod bolts so well see. Anyway so its the fuel jet I should mess with. Hmm, I dont have any lower fuel jets. Since Im prob gonna up it to a 100 shot anyway, would it be okay to just use the jet for the 100 shot. It would be pretty much like shooting a 100 shot anyway, just different fuel jet, but as long as A/F is good it should be fine. Im gonna get my bottle filled and get some good psi on it and then see what it does. So mid 11's, sounds good. Thanks for the advice.

So is it common to be as rich as I am with low bottle press?

 

no one huh...