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Thread: 2020 Mustang GT Large Fuel Trim Swings Stock Map

  1. #1
    Tuner
    Join Date
    Mar 2021
    Location
    Yuma. AZ
    Posts
    82

    2020 Mustang GT Large Fuel Trim Swings Stock Map

    went to tune a newer mustang today, car ran terribly before attempting tuning. Showing 30-40 percent lean on short term fuel trims without the customers mass air flow sensor hooked up, and 63-67 percent lean with mass hooked up.
    Vehicle has Aftermarket Headers, and a very large in diameter aftermarket Cold Air Intake on it.
    Weird Issues,
    1. Worked on calibrating the mass airflow sensor for the intake on the car,
    - Doubled and tripled the air volume metered between 0-1.9 volts looking for change at idol of fuel trims. change was little to none still looking for 60-62 percent in short term fuel trims.
    2. is the issue of not being able to log sensor voltage only frequency in channels. Voltage is used for airflow reference instead of frequency

    If Anyone Has A Stock 2020Gt 5.0 Mustang i can use for a compare file it would be appreciated, it is possible the car has been previously tuned though most of the tune appears normal
    Last edited by DB5249; 12-03-2021 at 08:51 PM.

  2. #2
    Tuner in Training
    Join Date
    Oct 2009
    Posts
    47
    you need to log Maf period and adjust the maf period table not the voltage table.

  3. #3
    Advanced Tuner
    Join Date
    Mar 2018
    Posts
    447
    You tune the 18 up fords using period, not voltage.

    Here is an unmolested 18 up MAF table
    Attached Files Attached Files

  4. #4
    Tuner
    Join Date
    Mar 2019
    Location
    Ogden, UT
    Posts
    98
    My 2020 Mustang GT 6spd PP1 301A

    Mig Stock.hpt

  5. #5
    Tuner
    Join Date
    Mar 2021
    Location
    Yuma. AZ
    Posts
    82
    much appreciated, Got it about sorted out this morning thank you