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Thread: Turbo Whistle?

  
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    turboed's Avatar
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    Exclamation Turbo Whistle?

    My turbo has just recently started making a whistling noise under boost from about 2000rpm in 2nd or 3rd gears +. Is it just a split pipe, a leaking vauxall dump valve or dont tell me something wrong with me stage 4 turbo ?

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    Don't be too pessimistic, it's probably just induction noise from a turbo loving a cold charge this weather - mine certainly is!

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    Quote Originally Posted by turboed
    My turbo has just recently started making a whistling noise under boost from about 2000rpm in 2nd or 3rd gears +. Is it just a split pipe, a leaking vauxall dump valve or dont tell me something wrong with me stage 4 turbo ?
    Deffo sounds like a boost leak to me, DV's are notorious for misbehaving, so try it without the DV, check all connections etc. If you still have any standard vauxhall jubilee clips on the boost side, get em off and replace them with decent ones.

    Have you noticed any drop in performance or other symptoms???
    Astra GSi Turbo, SOLD


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    I dont have a after market dv its the original one wherever that is and yes the car is missing under heavy boost at about 16 to 18 psi the car bunny hops

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    original dump valve

    I have a whistleing noise coming from around the turbo area and wonder if the oe dump vavles fail or could it be an actuator failure?

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    Quote Originally Posted by turboed
    I have a whistleing noise coming from around the turbo area and wonder if the oe dump vavles fail or could it be an actuator failure?
    If it was the actuator, you would not be seeing normal boost figures, it may cause a hesitation, but not huge misfire at 18 PSI, IMO

    And by rights that should not explain the juddering?? have you checked all hose connections?? I think Mike Warner replaced his OE DV as a matter of course when he was chasing running problems, I dont think that was much to do with it
    Astra GSi Turbo, SOLD


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