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Thread: Turbo fluctuations

  1. #1
    Snail1699 Guest

    Turbo fluctuations

    I have a TD5 with a turbo pressure fluctuation between 2200- 2800rpm. At quarter to half throttle the turbo pressure goes from about 10 pound pressure to about 5 pound vacuum. This all happens about 10 times a second.
    How I got to this, the car was vibrating in the rpm range so I put the vacuum gauge on the wastegate line.
    I have searched the forum but found nothing similar to this issue.

  2. #2
    discorevy is offline ChatterBox Silver Subscriber
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    You will need to fit a damper in the line to stop the needle fluctuating, also hook up the t piece in the tube between the intercooler pipe and the boost modulator , with your vibration when it does it gently pull up your hand brake and see if it goes away

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  3. #3
    Snail1699 Guest
    Thanks for the reply.
    The boost gauge was taken at the boost modulator via a tee piece. With the boost damper, is it as simple as fitting a restrictor in the line. If so, would a 1.5mm hole be small enough. I think that's my smallest drill bit.

    For the use of the hand brake, is this to reduce the backlash movement in the drivetrain ?

  4. #4
    Tombie Guest
    You need to take the boost from the line for the hard pipe to the modulator not after as it won't be reading actual boost

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