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overboosting problem 1.8t agu

Discussion in 'A3/S3 Forum (8L Chassis)' started by 1.8T_, Nov 29, 2012.

  1. 1.8T_
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    1.8T_ Member

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    [Nov 29, 2012]
    my car is chipped and should boost 1.4bar,for a while it boosting 1.6
    i disconnect the two electricity wires that connected to the n75 valve and went to test drive
    now instead of boosting 0.5 bar the car still boost 1.6bar!!!
    any ideas?
    #1
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  3. Lewis583
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    Lewis583 Active Member VCDS Map User

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    [Nov 29, 2012]
    Check all vac pipes on the same line as the wastegate actuator
    #2
  4. Prawn
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    Prawn My other car is a MINI!!!!

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    [Nov 29, 2012]
    sounds like the pipe from the actuator to wastegate has come off somewhere, or possible from charge pipe to N75 and causing a boost leak as well.

    that's the only explaination if you're getting above actuator pressure with the n75 disconnected
    #3
  5. s3dave
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    s3dave TFSI Hybrid

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    [Nov 29, 2012]
    Actuator damaged /semi siezed...... wastegate siezed/partially siezed .........bent actuator rod....
    #4
  6. 1.8T_
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    1.8T_ Member

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    [Nov 29, 2012]
    how to check the actuator?
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  7. 1.8T_
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    1.8T_ Member

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    [Nov 30, 2012]
    ok i just checked the hose from actuator to the n75 and was cracked , the rubber was hard like a rock o_O!
    lucky i have a tons of silicone hoses from ebay, everything works great now . :)
    #6

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