okay two things...i finished up my zex install but im scared to use it...does the zex kit account for and add enough extra fuel when spraying? marcucci told me that i have to have a vafc to be able to add the extra fuel or run the mix a lot richer to make the car safe for n20 use...so can i spray without a vafc or not for my 55 shot.
second question: on my autometer A/F ratio meter...at full throttle...the meter goes up to between the R and the I where it says rich....is that rich enough to spray? or does the meter need to read rich all the way down to the bottom of the meter?
PLEASE HELP ASAP!!! I want to spray so bad but i need to make sure of these two things first!
You will be fine. The zex kit will increase the fuel pressure to account for the added nitrous. Your meter should not be pinned rich when spraying, or you are running too rich. Happy spraying.
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no what i meant was that at full throttle off the bottle the meter only goes up to between the R and I on the "RICH" side....that's what im concerned about...when i spray should the meter go down a little or should it stay at rich?
You'll be fine, your kit will up the fuel pressure for spraying. I leaned my fuel out before spraying and I still run rich. If you trust that you followed the directions, go have some fun! Make a couple runs and then check your plugs. Go on, get out there and join us on the darkside, you know you wanna!
hehehe okay....im just scared as poo right now....when i get the balls to risk any damage to my engine i'll go out there and find a safe stretch of road to let her loose =D
You need to listen to more people that are knowledgable about nitrous, I bet every person you have had tell you bad things, really has no first hand knowledge (other than watching T F & F one too many times LOL) Don't you think everyone on this board was crapping their pants on their trial run? Hell, I'm still nervous every time I make a change to my system, it is perfectly natural.
oh i know....don't get me wrong i know that everyone is scared...i'm just thinking too much...i just need to go out there and do it...i would just rather go in the morning when i have daylight. I'll post it up after i do my first run and let ya'll know
All dry kits " trick " your vehicle into adding more fuel.. so don't worry about it.. not just that but you have a A/F meter right there.. so if anything.. monitor that and if you get worried.. quit spraying..but I know you'll be fine. It's not gonna be like you think.. you're not going to get slammed back into your seat and have the world fly by at 150 mph... but you'll feel a difereence and a hell of alot more pull. If you are really that concerned.. just start off slow.. like for 5 seconds or something.. you'll see what we mean.
Good Luck!!
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I had to stand on the throttle literally(Meaning that my ass was not in the seat) just to make myself spray the first time. You'll be fine and you don't need the VAFC to add fuel. We use the VAFC to lean. Preferably, your motor would always run at 14.7 AF ratio. We want to run a bit rich with nitrous just as an added safety measure.
Originally posted by vector4 So 14.7 is the optimum ratio for on the bottle? what about off? Is there somewhere I can see the prefered AF ratio for our engines?
14.7 is always ideal, but do not tune your engine to 14.7. If your bottle pressure gets higher than when you tuned it you will run lean and go pop. Mid 13s on the bottle are good. Low 14s off are good, but every car is different. Get the car on the dyno if you want to be sure.
Originally posted by vector4 Ok looking at dynotune's suggestions. 14.7 is way past dangerously lean. That is what I am concerned about.
14.7 is stoich. It always has been it always will be. It's not lean, but it isn't safe with nitrous or FI. There are too many variables that can nudge it over to the lean side and cause problems.
Originally posted by CanadaPreludeSE Yes, but remember those autometer guages are not accurate, just a ballpark figure.
The best way to tell if you are running right is by checking the plugs.
Autometer gauges are very accurate at WOT(nitrous use) As stated, get it to a dyno if you are really concerned. I was scared the first time but all of a sudden I just hit it and it was great. running a 50 shot is joke on our engines. If you installed the kit correctly you will have no problems. From my experince with my experince with the NOS dry kit, it is tuned to add the fuel for a 70 shot. The car runs very rich with a just a 50 shot so you will have no problems.
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