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Thread: IAT and tuning

  1. #1

    Default IAT and tuning

    So ive got 2 questions about the IAT sensor and compensations. Im assuming for tuning you dont have the compensation enabled, why is that?

    Second question, why dont you just leave the factory iat sensor wired as is and let it do all the fuel compensation for temperature? Why do you have to fool it with a resistor and let the map ecu do the compensation?

  2. #2

    Default

    Hi, good questions.

    I'm assuming for tuning you don't have the compensation enabled, why is that?
    It is just so when you are tuning the fuel table you know there nothing else altering the values you are entering in the fuel table. It can lead to confusion but if you work knowing that the MAPECU3 is tweaking the output from the fuel table, then no problem.

    Why don't you just leave the factory iat sensor wired as is and let it do all the fuel compensation for temperature? Why do you have to fool it with a resistor and let the map ecu do the compensation?
    It depends on the vehicle. Many vehicles have the IAT sensor built into the MAF sensor so if you remove it and convert to MAP, then you don't have an IAT sensor anymore. If you run the MAF in intercept mode, then you don't need the IAT sensor or IAT compensation enabled. If your factory IAT sensor is still connected to the OEM ECU, then by all means let the OEM ECU do the compensation. It is a much easier install.
    Last edited by MAP-ECU Man; 9th-March-2017 at 09:38 AM. Reason: Incorrect statement that MAF intercept has IAT compensation
    MAP-ECU Support

  3. #3

    Default Edit question

    Quote Originally Posted by MAP-ECU Man View Post
    Hi, good questions.


    It is just so when you are tuning the fuel table you know there nothing else altering the values you are entering in the fuel table. It can lead to confusion but if you work knowing that the MAPECU3 is tweaking the output from the fuel table, then no problem.


    It depends on the vehicle. Many vehicles have the IAT sensor built into the MAF sensor so if you remove it and convert to MAP, then you don't have an IAT sensor anymore. If you run the MAF in intercept mode, then you don't need the IAT sensor or IAT compensation enabled. If your factory IAT sensor is still connected to the OEM ECU, then by all means let the OEM ECU do the compensation. It is a much easier install.
    I just read this, than saw at the bottom was an edit from mapecuman that you misspoke about the intake air compensation. Can you elaborate? Do i need to run the aftermarket iat sensor even in maf intercept mode?

  4. #4

    Default

    No,you don’t need the MAPECU IAT sensor in MAF intercept mode because the OEM one is still there and working. You don’t want double IAT compensation.
    MAP-ECU Support

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