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No n2 increase after 18.1% rotation

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    No n2 increase after 18.1% rotation

    I have installed a fresh p3d v4.5 and now the 737 can’t go above 18.1% n2 rotation. Eng ignition is on grd and fuel is off. Apu is powering the aircraft with all fuel pumps on. Using external ground air provides enough air to reach 24%n2. This is with packs off as well on the first try the were on auto and the apu bleed was on as well.
    Last edited by ph-cxz; 11Apr2019, 14:18. Reason: added info regarding second start.
    Koen Meier

    I have flown the NGX yet with P3Dv4.5 so I gave this a look and I had a normal engine start.
    This in the B736 on APU no ground connections and one pack high and bleed crossfeed open. I noted duct pressure was about 20 psi during start before ignition, which occurred at 25%N2 as normal.

    You didn't mention your duct pressure.
    Dan Downs KCRP


    • ph-cxz
      ph-cxz commented
      Editing a comment
      crossfeed was set to auto.

    What about the isolation valve?
    James Ward


      Originally posted by ph-cxz View Post
      This is with packs off as well on the first try the were on auto and the apu bleed was on as well.
      If a pack was in auto, that was your problem.

      Normal start configuration is: eng bleeds on or off, APU bleed on, packs off, isolation valve auto.

      The only switchology problem I can think of that would give you any rotation at all, but not enough, is trying to power a pack and starter off the same bleed source.

      It is possible to start #2, then "isolate and ventilate" for pax comfort while starting number one... but in the virtual world, probably not worth it.
      Andrew Crowley


      • ph-cxz
        ph-cxz commented
        Editing a comment
        That might be it.