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  5. Leaning mixture altitude

Leaning mixture altitude

Scheduled Pinned Locked Moved PA-28R Turbo Arrow III/IV
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  • G Offline
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    gruizmd
    wrote on last edited by
    #1

    What altitude should I start leaning on the Turbo III?

    RetiredMan93231R 1 Reply Last reply
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    • G gruizmd

      What altitude should I start leaning on the Turbo III?

      RetiredMan93231R Offline
      RetiredMan93231R Offline
      RetiredMan93231
      wrote on last edited by RetiredMan93231
      #2

      @gruizmd In the real aircraft, you don't have to begin leaning until after you reach critical altitude and the turbo charger is no longer able to maintain sea level manifold pressure (29.92). But, unfortunately the current incorrect mixture behavior in MSFS will require you to start leaning much sooner than that. During the climb just look at the EGT gauge and occasionally lean the mixture as needed to maintain the EGT temp at about 100 degrees below peak, on the rich side of peak EGT (max power setting). After leveling off at cruise altitude, lean for peak EGT (max economy setting).

      G 1 Reply Last reply
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      • RetiredMan93231R RetiredMan93231

        @gruizmd In the real aircraft, you don't have to begin leaning until after you reach critical altitude and the turbo charger is no longer able to maintain sea level manifold pressure (29.92). But, unfortunately the current incorrect mixture behavior in MSFS will require you to start leaning much sooner than that. During the climb just look at the EGT gauge and occasionally lean the mixture as needed to maintain the EGT temp at about 100 degrees below peak, on the rich side of peak EGT (max power setting). After leveling off at cruise altitude, lean for peak EGT (max economy setting).

        G Offline
        G Offline
        gruizmd
        wrote on last edited by
        #3

        @retiredman93231

        Thanks for the explanation. I was confused because I read that in a Arrow Turbo you would not need to lean until about 11,000’. The limitations on MSFS explain why I was losing so much power on my way up.

        S 1 Reply Last reply
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        • G gruizmd

          @retiredman93231

          Thanks for the explanation. I was confused because I read that in a Arrow Turbo you would not need to lean until about 11,000’. The limitations on MSFS explain why I was losing so much power on my way up.

          S Offline
          S Offline
          Sender46
          wrote on last edited by Sender46
          #4

          @gruizmd There is a fix for this which you might want to try:
          https://forums.flightsimulator.com/t/mixture-behavior-mod-for-turbo-arrow-seneca-v-and-turbo-bonanza/465225

          Maybe JF could use this? (hint Martyn 😉 )

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          • I Offline
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            indrajitsg
            wrote on last edited by
            #5

            I am trying to lean the mixture - however even at 31% mixture at 6000 feet - I don't see any change in the EGT needle. It just stays where it is. It only changes when I open / close the throttle. Is this a bug or did I do something?

            W 1 Reply Last reply
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            • I indrajitsg

              I am trying to lean the mixture - however even at 31% mixture at 6000 feet - I don't see any change in the EGT needle. It just stays where it is. It only changes when I open / close the throttle. Is this a bug or did I do something?

              W Offline
              W Offline
              weptburrito
              wrote on last edited by
              #6

              @indrajitsg sounds like automixture may be enabled in the accessibility or assistance options.

              I 1 Reply Last reply
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              • W weptburrito

                @indrajitsg sounds like automixture may be enabled in the accessibility or assistance options.

                I Offline
                I Offline
                indrajitsg
                wrote on last edited by
                #7

                @weptburrito - Thanks a lot. The auto-mixture was switched on. I don't know how it happened - along with a few other assist options. Probably the latest update reset it.

                J 1 Reply Last reply
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                • I indrajitsg

                  @weptburrito - Thanks a lot. The auto-mixture was switched on. I don't know how it happened - along with a few other assist options. Probably the latest update reset it.

                  J Offline
                  J Offline
                  jmarkows
                  wrote on last edited by
                  #8

                  @indrajitsg Keep an eye on it, SU7 likes to continuously reset Assistance options to Easy for some people.

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                  • K Offline
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                    Kengou
                    wrote on last edited by
                    #9

                    I understand it is a sim limitation that mixture must be leaned in a turbocharged plane before critical altitude. Last night I climbed to 16,000 (leaning as I went), leveled off, leaned to peak EGT, and set my MAP/RPM per the manual. However, I did not see the expected fuel flow at all. It was higher than it ought to be. If I set MAP per the fuel flow markings for 75%, 65%, etc, the MAP would be very much lower than the performance charts.

                    Anything I'm missing?

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                    • J Offline
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                      jstnj
                      wrote on last edited by jstnj
                      #10

                      any updates here? would love to have this logic properly modeled...like the workaround which isn't ideal:

                      https://github.com/WxMarc/TurboEngineMixtureController/

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