2nd Gen R56 Cooper S Most liked posts in thread: Manual Boost Controller FAIL

  1. DneprDave

    DneprDave Well-Known Member
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    #2 DneprDave, Apr 10, 2014
    Reprogramming the Engine Control Unit is the only way. Just changing the boost without changing the fuel map will cause the engine to run lean and possibly melt holes in your piston crowns.

    Dave
     
  2. RedMamie

    RedMamie New Member

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    #3 RedMamie, Apr 10, 2014
    I'm assuming you're talking about getting a tune done on the car. I don't really have the funds for that.

    I saw some mentions of a fuel control or boost control defender. Any experience with that? Will it work for me?
     
  3. oldbrokenwind

    oldbrokenwind Active Member

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    #4 oldbrokenwind, Apr 16, 2014
    My Manual Boost Controller is used in conjunction with a Garrett turbo. MBC's control the waste gate opening, and OEM turbo's waste gates are operated by a vacuum. Garrett waste gates are operated at positive pressure --- my default was 11 - 12PSI. With the MBC, I've been running about 25PSI.

    The Boost Cut Defender, aka Fuel Cut Defender, allows the 22PSI ECU limit to be "cheated". It will not create boost, it just prevents the ECU from activating the waste gate at 22PSI. They (two are req'd) will work for you, but you don't need them until you start producing over 22PSI.

    Any changes to the boost control devices should be followed ASAP with a new ECU map --- a tune.