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Thread: Boost Leak?? high pitched squeel!

  
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    Question Boost Leak?? high pitched squeel!

    ok, ive just noticed a sort of high pitched squeel when the turbo starts to kick in, so im guessing i have a boost leak somewhere?

    i couldnt check right now because of lack of light, but are there any air pipes that a prone to splitting that i should check first?

    also, whats an easy way if checking the pipes? just leave engine running and feel around the pipes? because you only here the noise whilst the turbo spins??

    turbo is a vxr on a z20let fitted around 6 months ago.

    thanks for any help or advice, chris
    Star Silver Astra Coupe Turbo

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    bartonz20let's Avatar
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    check all your boost pipes as it could be any however my baily squeeks at times, poor build quality probibly.

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    ive took it out this morning and noticed a sort of whine from the turbo when cold... (not been hammering it btw) then that eventually went... then i coud here the squeel and with the window down, the sound of air sucking in... and then sometimes if i sit in 2nd gear, get it up to 2,000rpm, blip the throttle a sort of ''wurring'' noise... very similar to what i used to hear when i used to switch my old 2.2 off and when i switch this coupe off???

    so bearing in mind im a turbo novice.. could there be a boost leak, causing the turbo to stall and make this noise?? only had both noises since ive heard a sort of air leak/squeel

    confuzzleed!?!?

    p.s ive not got a aftermarket dump valve on it
    Star Silver Astra Coupe Turbo

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    Gary_D's Avatar
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    Ive got similar noise when my turbo boost starts in 2nd and 3rd gear.
    Been like that for 8 weeks now as have no clue what it is. thought it was the alternator bearings so changed it. no different
    checked turbo play etc, all fine.
    is your car driving well as in no power loss etc?

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    i thought the vxr turbos and the let turbos have a slight whistle anyway??
    www.chilled-rc.net For all your RC car/boat/heli/plane needs

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    my turbo whistle's on spool and has done for 3 years

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    My k04 standard turbo also whistles and has done since i bought it 19mnths ago. Done 48k now and still boosting fine touch wood!

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    sounds like one of BCS to me

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    ive only got one BCS left now after removing the rear one. and the front one is still new.... and i still get a whistle on full boost!
    www.chilled-rc.net For all your RC car/boat/heli/plane needs

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    Things got worst today... check all boost pipes and seem ok so i drove up to LMF as there started to be a very loud wurring sound when turbo starts to spool up... and now i have no boost atall... so guess the turbo's shagged

    when i blip the throttle it sounds as if the turbine is loose as it slightly rattles...
    Star Silver Astra Coupe Turbo

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