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Thread: What is this pipe coming off throttle body & why is it expanding

  1. #1
    Regular Member damers2000's Avatar
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    Default What is this pipe coming off throttle body & why is it expanding

    Hi all,

    Can someone tell me what this pipe is, it's the one shown in the picture below to the right of the engine, between battery. It's about 2" across.

    The reason I want to know is because it expands when I put my foot on the gas, is this normal??


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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

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    Er boost pipe
    Vectra vxr custome remaps egr deletes dpf and diagnostic work all remaps are custome bench tuning avalible all genuine equipment PM for info

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    Regular Member Innes's Avatar
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    When you rev your engine air is forced into the inlet manifold by the turbo. Its under highpressure so thats why the pipe expands. its perfectly normal to expand so theres nothing to worry about.

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    If it expands, does that mean some of the boost is lost trying to deform the pipe?
    Just thinking along the same lines as rubber brake pipes vs braided hoses.

    Can you get a silicon pipe to replace this?

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    Regular Member damers2000's Avatar
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    Quote Originally Posted by Innes View Post
    When you rev your engine air is forced into the inlet manifold by the turbo. Its under highpressure so thats why the pipe expands. its perfectly normal to expand so theres nothing to worry about.
    cheers mate, I could just see it throbbing when i pushed pedal down and was like

    turns out i'm a noob lol

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    Regular Member Innes's Avatar
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    Quote Originally Posted by DHobbs View Post
    If it expands, does that mean some of the boost is lost trying to deform the pipe?
    Just thinking along the same lines as rubber brake pipes vs braided hoses.

    Can you get a silicon pipe to replace this?
    it expands because its just under alot of pressure.


    I replaced my old hose because it had split. I thought i'd make my own by buying some proper metal tubing and silicone joiners (see my signature) but the downside was that the pressure was on the small pieces of silicone and I kept blowing the pipe off even with decent T-Bolts. In the end I went for a full silicone replacement so the pressure was evenly spread throughout the hose. It balloons a bit more than the rubber ones but its doing its job and it hasnt be blown off!




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    Full Member Big Sig's Avatar
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    Quote Originally Posted by damers2000 View Post
    cheers mate, I could just see it throbbing when i pushed pedal down and was like

    turns out i'm a noob lol
    What I find more amazing is the fact you can see it from the drivers seat!
    Now I need a turbo to keep up!

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    Regular Member damers2000's Avatar
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    Quote Originally Posted by Big Sig View Post
    What I find more amazing is the fact you can see it from the drivers seat!
    lol I had the bonnet open and top engine cover off as I was cleaning the throttle body

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