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Thread: Cdti boost gauge fitting help

  1. #1
    Regular Member winnie2457's Avatar
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    Default Cdti boost gauge fitting help

    Hi all I am going to be fitting a mechanical boost gauge

    Question is if I drill a small hole on the rubber boost pipe from intercooler to inlet manifold on my 150cdti and push in the barbed t peice very tight then seal it with rubber glue will this be ok to run with also where is the best place to feed the vacuum tube to the drivers side dash mount

    Any
    help greatly appreciated asap

    Also is there not a vacuum pipe I can splice it into on the turbo or does it have to be the big rubber boost pipe thhanks

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    North West Regional Organiser paulvectrac's Avatar
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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

    Default

    there will be a small vacume pipe somewhere if you put it on the large pipe if it ever pops out the car will go in to limp mode
    Vectra vxr custome remaps egr deletes dpf and diagnostic work all remaps are custome bench tuning avalible all genuine equipment PM for info

  3. #3
    Regular Member LADmachining's Avatar
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    The small pipes don't actually carry boost pressure, they are control hoses for the wastegate and carry a vacuum. If you tap into them, you won't actually measure the boost pressure.

    Ideally, the adaptor to connect the gauge hose to should be screwed into a metal part of the intake manifold. This may mean dismantling parts and meticulously cleaning out any swarf resulting from the drilling and tapping of the hole.

  4. #4
    Regular Member CristianTM's Avatar
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    I will show on my car how is fitted, but only later ...

    CristianTM.

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    Regular Member winnie2457's Avatar
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    Yes please show me thanks looking forward to seeing some pics

  6. #6
    On a Sabbatical daviek's Avatar
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    Quote Originally Posted by LADmachining View Post
    The small pipes don't actually carry boost pressure, they are control hoses for the wastegate and carry a vacuum. If you tap into them, you won't actually measure the boost pressure.
    Wrong there buddy Hence the reason why most boost gauges show you a vacuum reading too .... the minus numbers. When a turbo engine is not boosting its running vacuum.

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    Regular Member Marcosuk's Avatar
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    Quote Originally Posted by daviek View Post
    Wrong there buddy Hence the reason why most boost gauges show you a vacuum reading too .... the minus numbers. When a turbo engine is not boosting its running vacuum.
    So thats why a gauge never sits at 0 then... Learn something new everyday

  8. #8
    Regular Member LADmachining's Avatar
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    Quote Originally Posted by daviek View Post
    Wrong there buddy Hence the reason why most boost gauges show you a vacuum reading too .... the minus numbers. When a turbo engine is not boosting its running vacuum.
    Not in a diesel engine. There is no throttle valve in a diesel inlet tract as there is on a petrol engine, so a vacuum cannot be created as the whole inlet system up to the intake valves is essentially open to atmosphere.

    The only caveat to this is on modern diesel engines which feature a motor controlled throttle flap which closes when the ignition is switched off. This is to strangle the engine and reduce vibration as it comes to a stop. A vacuum would be briefly created in the intake manifold in this instance.

    My original statement is still correct in relation to the OP's question - you cannot measure manifold boost pressure by tapping the gauge into the small vacuum control pipes connecting to the turbo wastegate or boost control solenoid. You will only ever measure varying levels of vacuum.

  9. #9
    Regular Member storm's Avatar
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    Quote Originally Posted by CristianTM View Post
    I will show on my car how is fitted, but only later ...

    CristianTM.
    Do you have a piccy for us?

  10. #10
    Full Member Jay Kay 313's Avatar
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    When I fitted my gauge I dismantaled the front end of the car and removed the plastic intercooler pipe, drilled a 8th BSP tread to fit a brass take off that I got from Demon Tweaks, blow out all the swalf before refitting Have a look here think you'll need page two! HTH
    Astra Estate SRi XP 1.7 CDTi 100

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