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Thread: 300Tdi boost pressure - how much is enough?

  1. #1
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    300Tdi boost pressure - how much is enough?

    How much boost pressure should a standard 300Tdi Discovery have when at full noise doing 2500rpm going up a hill?

    Aaron

  2. #2
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    15 psi

    Sent from my GT-S7562L using AULRO mobile app

  3. #3
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    14.3-15.2 nominal is 14.7, more is betterer...

    non standard and you can have 30....
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
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    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
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  4. #4
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    I thought my power was down a bit, so I installed a boost gauge. The maximum pressure that I saw was 3.5 ~ 4 psi. I must have a problem. Where do I start looking? Turbo connecting hoses visually look good. How common is a hole in the intercooler?

    Aaron

  5. #5
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    assuming its not a fuel restriction issue, not a throttle cable being slack...

    check the boost compensator hose and then you' need to check the boost compesnation pin.

    it could also be the waste gate actuator failed open but if you wind hard enough the boost will eventally come up with just the wastegate stuck open.
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  6. #6
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    Should I be able to move the waste gate actuator rod by hand?
    It appears to be stuck with the bellcrank angled towards the rear of the vehicle.

    Aaron

  7. #7
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    no, but you should be able to move it with a small spanner on the actuator arm.

    my first test is to put compressed air onto the wastegate hose using an air duster or a regulated air supply.

    in most cases with symptoms youve describedthat arent the throttle cable or the fuel filter its the compensator line been chafed through or disconnected
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

  8. #8
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    you will not move the rod by hand.
    with the elbow pointing to the rear, this would be the closed, making boost position.
    This is where it should be with the engine off.
    '95 Defender 130 Single Cab
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    98% of all Land Rovers built are still on the road.
    The other 2% made it home.

    Cost difference between Britpart and Genuine seals: £2.04. Knowing that your brakes won't fail at any moment: Priceless.

  9. #9
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    Sitting around the campfire thinking...
    The actuator is a pressure operated diaphragm. Therefore, the rod would be pushed forward when pressure is applied, with the rest position being to the rear. So all is normal there.
    More thinking...
    Better check the hoses one more time. Left the torch at home, so feeling around in the dark. Bottom hose is split just before it goes into the intercooler.

    Aaron

  10. #10
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    That'l do it to you, olthough a spit hose would normally have a very breezy noise associated with it...
    Dave

    "In a Landrover the other vehicle is your crumple zone."

    For spelling call Rogets, for mechanicing call me.

    Fozzy, 2.25D SIII Ex DCA Ute
    Tdi autoManual d1 (gave it to the Mupion)
    Archaeoptersix 1990 6x6 dual cab(This things staying)


    If you've benefited from one or more of my posts please remember, your taxes paid for my skill sets, I'm just trying to make sure you get your monies worth.
    If you think you're in front on the deal, pay it forwards.

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