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Thread: Two Level Boost

  1. #61
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    So what else could cause the turbo to suddenly spike 0.3+ bar like I'd just pressed a 'TURBO' button on the dash? Literally. It happens so quick that the controller and actuator haven't got time to compensate...

  2. #62
    Meddy Guest
    Quote Originally Posted by Nicely
    So what else could cause the turbo to suddenly spike 0.3+ bar like I'd just pressed a 'TURBO' button on the dash? Literally. It happens so quick that the controller and actuator haven't got time to compensate...
    Im not saying it couldnt be boost creep only that when the wastegate is disconnected you will still see boost.

    I do find it a bit hard to believe that the addition of a tubular manifold would give you such an issue as compared to my setup without. I would imagine if it was the manifold at fault you would expect to see dozens of 14 owners with the same issue.

    Is it possible for you to get hold of a different EBC and give that a go?

    Thinking as Im writing this but is the T28BB a twin scroll housing and the non BB unit isnt? Next question does the wastegate vent from only one scroll or from both?

  3. #63
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    The T28BB looks virtually identical to the T28. The only differences that I can tell, apart from the obvious, are the oil feed located slightly differently and the wastegate being separated from the turbine by a curved metal wall. There is no wall on the T28.

    Most of the SXOC people running a tubular mani are running a T28.

  4. #64
    Meddy Guest
    Quote Originally Posted by Nicely
    The T28BB looks virtually identical to the T28. The only differences that I can tell, apart from the obvious, are the oil feed located slightly differently and the wastegate being separated from the turbine by a curved metal wall. There is no wall on the T28.

    Most of the SXOC people running a tubular mani are running a T28.
    You mean there is a dividing wall down the middle of the turbine housing? i.e. twin scroll

  5. #65
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    If that's 'twin scroll', yes As to whether it vents from both -

  6. #66
    Meddy Guest
    Quote Originally Posted by Nicely
    If that's 'twin scroll', yes As to whether it vents from both -
    Usually not, which is what I was thinking. Now please stop me here if any point you think Im talking b@:locks.

    Ok on the standard mani from memory all 4 exhaust branches feed into the turbo mount so the gasses will mix before entering the turbo. On the tubular manifold the branches are split and feed in in pairs. So on the tubular manifold the wastegate is only venting 30-40% of two cylinders flow and not 30-40% of the overall flow. I am no aero expert so will check my thinking with them, but it could be an explanation as to why I never had issues and you do.

  7. #67
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    i.e. you where running a standard mani whilst I have tubular...

  8. #68
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    Hmm. This is the turbo mount of the tubular mani. Looks as though it does mix before entering the turbo...


  9. #69
    Meddy Guest
    Quote Originally Posted by Nicely
    Hmm. This is the turbo mount of the tubular mani. Looks as though it does mix before entering the turbo...

    Still looks like there may be two distinct seperated flows there. It would be interesting to see the same view of the stock manifold if you have it kicking around.

    Other than this I cant really see any reason it would behave any differently than with an OEM manifold.

  10. #70
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    From memory i think the stock manifold has a dividing wall in the outlet. so there is 2 outlets so to speak.
    Not 100% on this, but about 90%.
    Nissan GTR -09 Now with Cobb accessport stage 2

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