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Thread: Low Boost

  1. #1

    Default Low Boost

    I know this will be hard to diagnose via text, but Im all out of ideas, Quick description, Was supercharged and made 15lbs with the D1 procharger setup, then went turbo, Turbonetics 76mm, .96 AR, T4 flange, front mount intercooler, 50mm turbosmart waste gate and 50mm tial blow out valve, cam changed from supercharger, problem is no matter what I try, be it run 20lb spring, or 15 I only can get 10lbs of boost, one guy said my vacuum lines were routed wrong so I changed to his diagram, no change, installed a boost controller, no change, so Im listening to you all, Thanks

  2. #2

    Default

    The wastegate fire ring is installed?

    Cold side sealed up and no leaks?

    Does it do the same with no filter on the turbo?

    Any damage to the turbo?

    Downpipe size?

    How is the boost controller plumbed now?
    Correlation does not imply causation.

    Una salus victis nullam sperare salutem

  3. #3
    Pr0jekt Turb0?


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    Name
    Ryan
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    1993 Camaro Z28
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    Utica, NY + Jacksonville, FL
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    Default

    In addition to those questions:

    Do you get any compressor surge?

    Blow off valve weak or not sealed?

    TB gasket and intake manifold gaskets in good shape?
    -Ryan
    93 Z28 M28

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  4. #4
    Long Live the Opti


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    Sean
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    1999 Twin Turbo Corvette
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    Default

    So even on a 15 or 20lb spring you can't make it past 10lbs? Wastegate fire ring missing? Have you checked backpressure between the turbo and heads? Could be you're building enough to force the gate open too.

    Two ports on the gate. Assuming backpressure is NOT an issue: Pressure side line (could be intake or cold side) to LOWER port by the base will give you spring pressure. NO vacuum line connected to the wastegate should give you roughly double the spring pressure in terms of boost. If you don't make spring pressure with the lower port hooked to the intake manifold, there's a problem there.
    Quote Originally Posted by Ryan Stout View Post
    I would try to work my neck muscles but I'm not invited to the LS guy parties.

  5. #5

    Default

    Kinda off the wall, but, any chance your MAP sensor went bad and is just not reading correct?
    Correlation does not imply causation.

    Una salus victis nullam sperare salutem

  6. #6

    Default

    Quote Originally Posted by shownomercy View Post
    The wastegate fire ring is installed?

    Cold side sealed up and no leaks? Yup

    Does it do the same with no filter on the turbo? Yes

    Any damage to the turbo? Nope, Brand new

    Downpipe size? 3"

    How is the boost controller plumbed now?
    No boost controller anymore

    Do you get any compressor surge? None

    Blow off valve weak or not sealed? All brand new, smoked the entire system, no leaks

    TB gasket and intake manifold gaskets in good shape? New motor

  7. #7

    Default

    Tested fire ring, no leaks

  8. #8

    Default

    Quote Originally Posted by Fastbird View Post
    So even on a 15 or 20lb spring you can't make it past 10lbs? Correct
    Have you checked backpressure between the turbo and heads? No have not
    Could be you're building enough to force the gate open too. That's a possibility, boost is all in by 3600 RPM

    Two ports on the gate. Assuming backpressure is NOT an issue: Pressure side line (could be intake or cold side) to LOWER port by the base will give you spring pressure. NO vacuum line connected to the wastegate should give you roughly double the spring pressure in terms of boost. If you don't make spring pressure with the lower port hooked to the intake manifold, there's a problem there.
    ok, possible diagram for this? I don't remember where and what the lines are plumbed to anymore

  9. #9

    Default

    Bottom port of the wastegate goes to compressor housing, leave top port with with nothing if you want to just run spring pressure sans controller.
    Correlation does not imply causation.

    Una salus victis nullam sperare salutem

  10. #10

    Default

    OK, Ill give that a try and report back, Thanks

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