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Thread: NOT a happy stu!

  
  1. #1
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    Glasgow_Stu's Avatar
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    NOT a happy stu!

    Well i think i might have found why my RR figures are down 30bhp



    A bloody crack along the inside of the manafold housing next to wastegate

    Guess i will be on the lookout for another bloody manafold then.
    The coupe...ITS ALIVE & back from the dead....again!
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    y dnt u go for a better on this time?
    vxr turbo, FMIC, TX tophat and powerpipe and remap from noblemotersport. 271.5 bhp and 331 lbft. http://www.astraownersclub.com/vb/sh...d.php?t=332537

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    would that cause a loss of -30 bhp? reason i ask is i had a big crack on my old let turbo and it still made the correct power
    Astra T9 estate for sale, see my ebay link!

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    Yeah ditto what adam said i had a crack in mine and it still pulled 270

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    crack on my manifold goes other way from wastgate,longways,but as said stu,made no difference in my performance,didnt even know had turbo problem til turbo was off

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    it depends if its leaking or not
    if the crack leaks under boost then exhaust gas will be lost creating a wastegate effect so boost will not be preduced
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    if its a small crack will it not seal upon the manifold heating up and expanding??

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    it might not be this that is causing the issue tho

    seems oit could have been there for a while..

    I have BIGGER problems right now tho..

    stem seals are sorted thats fine.. but i have a rather annoying issue with the rest o the car that i will explane in a new thread ...
    The coupe...ITS ALIVE & back from the dead....again!
    The internet: where everybody knows everything about **** all.

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  9. #9
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    Rave Master's Avatar
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    Every zlet turbo I have seen has that crack, including mine.
    As jackdaxter said, when heated up such cracks seal because of material expansion.

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    Daz coupe's Avatar
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    the wifes act had a crack the same as that, and made 253 on stage one...
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