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Thread: Boost with actuator vacuum removed

  1. #1

    Boost with actuator vacuum removed

    Can anyone answer/try this for me?

    I unplugged the vacuum at the n75 ( the pipe going to actuator) and get underboost as expected....till about 2/2.5k revs....

    Then all hell breaks loose. I managed to overboost and get up to 2500 mbar of boost.

    Working as intended or sticky vnt/actuator? Maybe the increase in exhaust is enough to push the turbo??


  2. #2
    Golf mk4 tdi 130 mickstoke's Avatar
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    Re: Boost with actuator vacuum removed

    I'll let neil explain!


  3. #3
    2nd Gear old_n07's Avatar
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    Re: Boost with actuator vacuum removed

    When the vacuum is disconnected the vanes will be stuck in the open position so you will get lack of boost at low revs

    If your actuator is not adjusted correctly or the vanes are sticking and not reaching the fully open stage you can still get overboost with the vac lines disconnected.



    Neil

  4. #4

    Re: Boost with actuator vacuum removed

    So working as intended then ? Low boost at low revs but high revs provides enough pressure to spool the turbo? So if my vnt lever is fre enough to wiggle and also makes an audible change to turbo noise. Hmmmm

    How springy does the actuator have to be to return

  5. #5
    2nd Gear old_n07's Avatar
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    Re: Boost with actuator vacuum removed

    Sounds like it is working as intended, as long as the spring moves the rod on the actuator to the fully extended position when the vacuum is release then it should be OK.

    Does the acuator hold vacuum?

    Does it pull the arm back all the way?

    If yes to the above then it could just need setting up properly or there may be some crud in the VNT mech that is stopping the vanes opening fully.

  6. #6

    Re: Boost with actuator vacuum removed

    It does go to what seems to be the top.
    It holds vacuum
    It pulls down to the stop

    Actuator adjustment doesn't seem to make any difference however it could indeed not be opening fully, just appears to be

    I have been advised it may be retarded injector timings causing massive boost?

  7. #7
    4th Gear georgevw's Avatar
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    Re: Boost with actuator vacuum removed

    it shouldnt be to bad as most people tend to do the n75 or n249 bypass which does make some engines run better

  8. #8
    2nd Gear old_n07's Avatar
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    Re: Boost with actuator vacuum removed

    Isn't the n249 bypass for the petrol engine though?

    My guide to removing the N249 valve, with pictures - uk-mkivs

    There is an N239 on the PD 130 and 150 smokers that opperates the anti shudder, N18 for the EGR, and the N75 for the turbo VNT mech

  9. #9
    4th Gear georgevw's Avatar
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    Re: Boost with actuator vacuum removed

    Quote Originally Posted by old_n07 View Post
    Isn't the n249 bypass for the petrol engine though?

    My guide to removing the N249 valve, with pictures - uk-mkivs

    There is an N239 on the PD 130 and 150 smokers that opperates the anti shudder, N18 for the EGR, and the N75 for the turbo VNT mech
    yes mate sorry thought you had a petrol my bad
    and yeh on the pd engines most people tend to do an egr block off and n75 removal

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