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Thread: Low Boost Problem

  1. #11
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    Quote Originally Posted by monjarassi View Post
    the OP never specified what all he had or has done to the gate so it explains everything.
    Explains why he has boost creep problems? Or just explains how it's setup? Based on what he's said he either has a leak in the line going to the bottom port of the wastegate, a leak in the diaphragm of the wastegate, or a poorly designed manifold that is simply creeping.

  2. #12
    Newbie Brezno's Avatar
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    Wastegate is a 44mm MVR.
    Now I've welded my dumptube that it's open because I thought there could be too much backpressure between downpipe and wastegate but still boost creep. After that I made a port in the compressor housing for my wg with a shorter line but still boost creep.

    Here's a pic of my manifold. I know the position of the wg neck is not the best...
    [IMG][/IMG]

  3. #13
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    That's why you're boost creeping. Manifold design is the most common cause for boost creep.

  4. #14
    Senior Member Shanket's Avatar
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    i have same manifold no creep im on 8 psi also gt3071
    Last edited by Shanket; 07-23-2014 at 01:23 AM.

  5. #15
    Newbie Brezno's Avatar
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    Hmm, which wastegate and spring do you have installed.

  6. #16
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    Quote Originally Posted by Brezno View Post
    How could it be backwoards?
    I've a "Y" connector at the end of my intake manifold with one line which goes to bov an the other to the wg (44MVR). The one at the wg is installed at side, other sideports are closed and the upper for boostsolenoid are open.
    As a start, you should never Tee your wastegate and BOV. They should have their own vacuum sources.
    Quote Originally Posted by monjarassi View Post
    check and see if the solenoid is hooked up this way.

    Follow this diagram when you have a boost controller
    Quote Originally Posted by Brezno View Post
    Wastegate is a 44mm MVR.
    Now I've welded my dumptube that it's open because I thought there could be too much backpressure between downpipe and wastegate but still boost creep. After that I made a port in the compressor housing for my wg with a shorter line but still boost creep.

    Here's a pic of my manifold. I know the position of the wg neck is not the best...
    [IMG][/IMG]
    Definitely a creep-able manifold. Seems that this isn't the issue though. Just because it looks like it can creep doesn't mean that's why. Ensure that the vac line isn't kinked and is big enough and strong enough. There are many cases where poor vacuum lines end up collapsing, typically when things are hot. Also, as a rule of thumb, make sure to zip-tie your vacuum line connections. Slip-fit barb fittings alone don't cut it.
    Last edited by BoostedK20; 07-23-2014 at 11:22 AM.


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  7. #17
    Senior Member Shanket's Avatar
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    Quote Originally Posted by Brezno View Post
    Hmm, which wastegate and spring do you have installed.
    7 psi spring, i have turbosmart 45mm

  8. #18
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    Another thing to note, just because one setup doesn't creep for someone, doesn't mean it won't creep for someone else.

  9. #19
    Newbie Brezno's Avatar
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    I've tested without any wg spring today. The result 12psi boostcut at 7800 rpm in 5th.
    After checking the mapsensor I've seen some oxidized pins.


  10. #20
    Newbie Brezno's Avatar
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    Changed the pins but still creeping...
    After installing a second 44mm wg the problem was solved. Now i hold the boost until limiter.

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