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  1. #1
    Registered Member One Ring
    Join Date
    Apr 19 2008
    AZ Member #
    27872
    Location
    ct

    help s4 boost problem

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    i have a 2001 s4 i just bought the boost gauge goes to 5-6 pounds sometimes the car goes to 20 pounds but most of the time 5-6 i just switched the n75 valve still same problem the car has hyperboost diverter valves can someone please help if they had the same problem

  2. #2
    Active Member Four Rings RogueStatus's Avatar
    Join Date
    Nov 13 2007
    AZ Member #
    22558
    My Garage
    B5 S4 Avant
    Location
    Boston

    Re: help s4 boost problem

    pressure test for leaks. TBB mainly.

  3. #3
    Veteran Member Three Rings FlaS4's Avatar
    Join Date
    May 05 2008
    AZ Member #
    28448
    My Garage
    2000 B5 S4
    Location
    Miami, FL

    Re: help s4 boost problem

    Your boost hoses may be expanding when boost is high and you are losing pressure. Stock hoses and diverter valves on the B5 can't take the added boost produced by an ECU upgrade.

  4. #4
    Veteran Member Four Rings
    Join Date
    Dec 06 2007
    AZ Member #
    23142
    Location
    Calgary, AB, Canada

    Re: help s4 boost problem

    ^^^I highly doubt that is the reason for him going into soft limp mode.

    Are your dv's splitters or true dv's?

    Do a boost leak test. Log block 115 using VAG com.

  5. #5
    Senior Member Two Rings Luca12's Avatar
    Join Date
    Sep 16 2007
    AZ Member #
    21122
    My Garage
    00 b5 s4
    Location
    jacksonville, fl

    Re: help s4 boost problem

    I have the same problem... i think.

  6. #6
    Veteran Member Three Rings Paulyworld1432's Avatar
    Join Date
    Dec 07 2007
    AZ Member #
    23171
    Location
    Houston, TX

    Re: help s4 boost problem

    Hey Jerbel, noob question what are splitters?

  7. #7
    Veteran Member Three Rings
    Join Date
    Apr 18 2007
    AZ Member #
    17392
    My Garage
    b5 s4 nogaro , 1991 bmw 325is 5spd
    Location
    florida,wellington & hollywood

    Re: help s4 boost problem

    ^ 50% boost into atmosphere ( blow off valve) 50% into recirculation :)

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