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Thread: What controls the boost?

  1. #1
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    Default What controls the boost?

    What controls the boost on my 05 cdti 150? Is it the usual setup of a boost pipe coming off the the turbo then through a solenoid then to the wastegate.
    I've never owned a turbo diesel before so don't know how they work. Although I have owned a few imprezas and got very familiar with them over the years.
    Will a diesel only generate boost while under load like a petrol, so say I just held the revs at 3k while stationary would it generate any boost.

  2. #2
    Regular Member nutron's Avatar
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    Vehicle : Vauxhall

    Trim : very

    Engine : Z19DTH

    Year : Nosey

    Default

    There is not waste gate on the Z19DTH, it is a GT1749MV turbo. That means it has VNTs, vains that move in the exhaust flow to direct the exhaust flow onto the turbine changing the angle and acceleration of the gases to optimise spool and allow the boost output to be regulated. At 3000rpm under load you would get full boost, when cruising or rolling under inertia there would be less gas flow (due to less fuel and less boost) and the vains would be in an offload possition, so you would see very little boost.

    The boost pressure it read at the inlet manifold and the vains are moved by a vacuum controlled actuator. The ECU uses a solenoid to vary the level of vacuum to the actuator.

    If you do a search online for pictures of a VNT turbo mechanisum, it would help.
    Last edited by nutron; 14th July 2012 at 17:28.

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    Regular Member lee gsi's Avatar
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    Vehicle : Signum

    Trim : Design

    Engine : 1.9 CDTi

    Year : 2005


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    Default

    Thanks for the replies folks.
    The reason I ask is if i rev my car to say 3k when stationary you can hear the turbo spool up then when it gets to 3k it totally changes in sound and does a tiny missfire. As the revs are climbing it sucks hard then reaches the desired revs and boost then the sound totally changes. Do these suffer from the vains sticking? Is there a way of freeing them off?

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