The pain of it all.

Discussion in 'Technical' started by beaver, May 3, 2019.

  1. THZX

    THZX Member

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    No problem
     
  2. zx299

    zx299 Well-Known Member

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    You are half right ........ cruising IS closed loop

    The zed ecu ignores O2 feedback at idle, which makes it OPEN loop.

    If idle was closed loop, adjusting latency would have little effect on idle mixture because the O2 feedback would constantly try to pull the AFR back to Stoich
     
  3. beaver

    beaver southern zeds

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    Terrific thanks...
     
  4. THZX

    THZX Member

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    Nistune 3.png

    This is standard Nistune with Feature Pack showing O2 fuel trimming commencing at 51 degrees.



    Nistune 2.png

    Map trace showing O2 voltage in Closed Loop/idle as well as Open loop. Closed loop can be deactivated which some tuners do.
     
  5. MagicMike

    MagicMike Moderator Staff Member

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    Agree, you can see long and short fuel trims moving at idle
     
  6. zx299

    zx299 Well-Known Member

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