Fuel Starvation?

Discussion in 'Mustang Chit Chat' started by Mark_K, Aug 5, 2022.

  1. Mark_K

    Mark_K Junior Member

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    So I finally got out to the dragstrip with my new nitrous setup. I'm running a Nitrous Outlet plate kit with jets for a 100 wet shot with a window switch. The installation was straight forward and programming the window switch was also pretty simple. So I got the tires hot, staged and got a good launch. First gear pulled really hard, and when I shifted to second, I could feel it when the nitrous kicked in at 3,000 RPM. I could tell I was running faster than I had ever run before. I shifted into third gear and the car fell flat on it's face. It was missing and had NO power. I backed out of it and was able to get it smoothed out and finished the run. Hmmm. I thought maybe I missed a shift or something. Ran again, and the same thing happened. If I ran without the nitrous it ran like it always runs, smooth, and 14.1-ish at 103-ish MPH. Bandimere is at 5,800 feet and had a DA of 8900 feet this week. I was cutting about half a second off my 1/8th time, but kept falling flat in 3rd. So my question is, could the fuel pump just not be able to keep up? I'm running a wet shot, and was thinking that maybe it was just using enough extra gas with the wet shot to overrun the fuel pump. Does anyone have any experience with this? Could it be fuel, or is there something else I'm overlooking?

    Thanks,
    Mark
     
  2. Midlife Crises

    Midlife Crises Senior Member

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    Datalog ?
     
  3. Pentalab

    Pentalab forum member

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    What was the FPDC ? And also fuel pressure.
     
  4. MrBhp

    MrBhp Senior Member

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    After running several nitrous cars, I tell everyone the same thing. No fuel pressure gauge, no nitrous. If you can't watch fuel pressure, you are playing with the life of your pistons. And maybe more. If you don't have a way to datalog, you need to remedy that situation as well. Best thing to do is get an SCT programmer. Or something of that sort. You can do it with a laptop plugged into the obd port as well. Not as good but works. I believe there is a wireless setup so you don't have wires wrapped around your feet. As to the problem you're having, you are either running out of fuel or running out of nitrous. It's going fat or lean. Probably lean. For fuel upgrades contact @JeremyH on this forum. Your issue could be a number of things. But I wouldn't hit it again without knowing what the fuel pressure is doing.
    Edit: An added benefit to getting the SCT tuner is that you can then have Lito tune it for you. www.tudyno.com
     
    Last edited: Aug 6, 2022
    Mark_K likes this.
  5. Pentalab

    Pentalab forum member

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    What happens if you set it up for a 50 shot ?
     
  6. jewc75

    jewc75 S197 Junkie S197 Team Member

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    Assuming this is a coyote based on your pic. You need a nitrous tune or you are going to destroy your engine.
     
  7. 07 Boss

    07 Boss Senior Member

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    Yeah, at a minimum, timing needs to be backed off a few degrees and probably a richer A/F ratio at WOT.
     
  8. Mark_K

    Mark_K Junior Member

    Age:
    65
    21
    8
    Thanks all for your replies. I'll be returning to the strip tomorrow night, Wednesday. I'm going to bring my SCT so I'll be capturing the data.

    I don't think I'm running out of nitrous since the tank is basically full. I only made 3 passes before I shut it down. I did install 1 range colder plugs when I installed the nitrous. I haven't found yet anyone who will tune it. This is Denver, and everyone wants to tune LS's and imports. They all seem to be afraid to touch Coyotes.

    Can Lito create a nitrous tune for a car that runs exclusively at high altitudes? Bandimere is at 5,800 feet, and my driveway is at 5,900 feet. The air density at Bandimere is usually around 8,500 - 9,000 feet during racing season.

    Mark

    Also: Does anyone have any feedback on a DeatschWerks 415LPH DW400 In-Tank Fuel Pump?
     
  9. Laga

    Laga Senior Member

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    Lito doesn’t do Coyotes. Look to Lund, or VMP.
     
  10. jewc75

    jewc75 S197 Junkie S197 Team Member

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    I had the dw400 pump for a long time on a full bolt on car. Now i have 3 of them.
     
    Mark_K and XJCasper like this.
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