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Thread: Episode 6 - 3.5" MAF Upgrade Video

  1. #26
    Join Date
    Feb 2009
    Location
    Long Island, NY
    Posts
    8,167
    My Cars
    97 M3 & 13 Rav4
    Quote Originally Posted by jakermac View Post
    That's not the only reason for needing a tune. The sensor wire reads the air moving past and calculates a voltage based on the airflow at the sensor wire and the DIAMETER of the tube that the sensors resides in. Therefore, the wire sees x flow and based on a 3" tube tells the DME a voltage which represents how much air is coming in. If you change the diameter of the tube to 3.5" without telling the DME, suddenly the signal going to the DME is no longer correct. One of the changes in the tune when accounting for the larger MAF is telling the DME that the voltages coming from the MAF represent a different amount of air entering the engine.
    Of course. I figured this was obvious. I should've mentioned it too though.

  2. #27
    Join Date
    Jan 2013
    Location
    Plano, Texas
    Posts
    147
    My Cars
    1989 325i
    Quote Originally Posted by LockDots View Post
    Of course. I figured this was obvious. I should've mentioned it too though.
    Just seeing this now. I agree


    Sent from my iPhone using Tapatalk

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