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Can someone help me to understand JB4 Backend Flash?

Discussion in 'N54' started by ysjeon1698, Jan 30, 2017.

  1. ysjeon1698

    ysjeon1698 Specialist

    I just got JB4 G5 backend flash (MHD)

    I read about it from the bimmer post and other area that JB4 controls the boost and MHD controls the timing.

    After flashing the ECU, do I need to set up something? or does it automatically changes the timing?

    How and what does Backend flash do to my car anyway? I am on Map 5 at the moment.


    Car: 2011 N54 335IS (FBO without inlet/outlet)
  2. Terry@BMS

    [email protected] Corporal Vendor

  3. Kervio

    Kervio Private

    To utilize the BEF, you must flash a special BEF map otherwise the jb4 + MHD won't work together.
  4. ysjeon1698

    ysjeon1698 Specialist

    like... I need to download the map from website and put it in the folder ?
  5. Terry@BMS

    [email protected] Corporal Vendor

    You copy it to your phone and then use the MHD to upload it to the DME using the $79 BEF MHD license.