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Old 09-27-2010, 12:10 AM   #1
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Question N2O Flare Jetting

I'm curious to know what size flare jets you guys are running with your N20. I'm only running a 50 shot, but I want to get my jetting right. From reading the directions that came with my NOS kit, I should run a -30 (N20) and a -18 (fuel) for a fuel pressure of 60 psi to achieve my 50 shot. I have a inline NOS fuel pressure gauge installed, so that verifies my psi. I'm going to have McNews dyno my N2O in a couple weeks before I even think about spraying. Should I buy a bigger flare jet to take with me for tuning? Say a -19? This will richen me out some. I figure I can bring it with me and change it out there in case some fine tuning needs to be done.


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Old 09-27-2010, 07:17 AM   #2
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I would yes , you wont reach 60psi of fuel psi more in the 39-45 range under WOT

You also need a wide band in the car for Nitrous reguardless of the tuner

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Old 09-27-2010, 01:57 PM   #3
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ok thanks Tom, I have a AEM wideband installed. So I read through my directions for the 100th time, I called NOS, and honestly when they heard what vehicle I was installing their kit in, they weren't very helpful. I need to rate my fuel pressure with ingnition ON engine OFF, this gives me a fuel psi of ~45psi. Is this the approximate fuel pressure @ WOT? What I was doing wrong was reading fuel pressure during idle. That reading was ~60psi. Using the chart in my directions from my kit, with a fuel pressure of 45psi, I need a -30 (N2O) and a -22 (Fuel). And then I will go to the dyno with a -23 (fuel) for fine tuning. Does this sound right?
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