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Thread: 1972 911T MFI adjustment to lean full throttle circuit

  1. 04-28-2025, 05:57 PM #1
    Perry911
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    1972 911T MFI adjustment to lean full throttle circuit

    I wanted to see if I can confirm that clockwise adjustment of the MFI full throttle circuit is the correct movement in order to lean the fuel air mixture at full throttle on a 1972 911T.

    In other words. Clockwise would lean full throttle and counter clockwise would richen the high end circuit.

    We have confirmed over 4000 rpms to read 9.5 to 9.7. We believe we should be reading 11.5.

    Car flattens out in the 4 to 5,000 rpm range when full throttle.

    Please correct me if I am wrong.
    1969 911T Coupe Blood Orange (Vivy)
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  2. 04-28-2025, 07:57 PM #2
    edmayo
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    If you're speaking of the adjustment under the allen bolt, then yes, that is the load circuit and clockwise leans it.
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  3. 04-29-2025, 01:48 AM #3
    Perry911
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    Quote Originally Posted by edmayo View Post
    If you're speaking of the adjustment under the allen bolt, then yes, that is the load circuit and clockwise leans it.
    Correct umundo. Under the allen bolt Sir.
    I have the tool. A long yet small flat headed screwdriver. I am headed that way.
    1969 911T Coupe Blood Orange (Vivy)
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  4. 04-29-2025, 04:03 AM #4
    edmayo
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    Have you set all your linkage lengths, such as the the pump rod length to 114mm. And then set all other rod lengths to not have any pretension.
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