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Thread: 1.9 CDTi wastegate chatter???? Induction kit....

  1. #1
    Regular Member Vectra Adz's Avatar
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    Engine : 1910

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    Default 1.9 CDTi wastegate chatter???? Induction kit....

    Basically on my mk3 astra gsi turbo, it chatters when changing gear from the turbo, can this be done on my engine at all?? As eventually im gonna stick a straight through on it and get rid of the cat.

    Cheers

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    Regular Member Vectra Adz's Avatar
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    No one???

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    it should chatter abit with a cone filter. i put one on my mates tcdi mondeo 52 plate and that does it. dump the cat and let it breath better.

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    Regular Member Vectra Adz's Avatar
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    Yeh im trying to get hold of a decat pipe for it at present, just wondering about MOT for it, as it already smokes bit at the moment when i load it up as its got a tuning box on it. lol

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    It's not wastegate chatter its compressor surge. It happens when using lots of boost then let off the accelerator, the compressed air tries to go back over the turbo blades, this is why cars are fitted with dumpvalves, normally recirculating ones as standard as this dumps the excess air back into the system.
    You can make the noise more noticeable by using and induction kit getting the filter to turbo pipe as short as possible. The way of making it louder is by getting an after market recirc valve with a higher spring value which won't dump the air until more pressure is there.

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    Regular Member amand's Avatar
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    yep correct, compressor surge gives the owl hooting sound or the too too too tooh. when you give it full throttle and release before turbo kicks in.

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