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Thread: hunting for boost pipe leaks

  
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    Dave V6's Avatar
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    hunting for boost pipe leaks

    i was checking for split or broken vac pipes around the rear bcs and couldnt find anything but noticed a small black flattish box (maybe 4 inch x 5 inch ) with 2 pipes going in to it that look like small vac pipes, anyway one of them was not connected , i reconnected it (just push fit) expecting some improvement but it did nothing, what is this black box and what does it do ?
    Does anyone know if the rear bcs is the same component as the front bcs so that the 2 could be interchangeable .

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    Front and rear bcs are different and the box is called a vacuum box.

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    thankyou mate, what is the purpose of the vacuum box, whats it do and how will it manifest itself if its knackered?

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    the BCS are interchangeable altho they differ ever so slightly

    one of the outlets is slightly larger bore than on the other solenoid

    both should be easy to interchange to fault find etc


    a brand new one will set u back £17+VAT on trade club from Vxl iirc



    if ur in doubt about the rear vac setup id bypass it altogether


    Leave the rear BCS connected to the elec plug, in fact leave the vac hoses connected should u wish to return to this setup


    Run a fresh silicone 3mm hose from the Throttle body >> Fuel Pressure Regulator... Then 2 or 3 T-pieces depending on how many u need, and T off to the boost gauge, aftermarket DV and OE DV .. DONE!

    If you leave all the factory vac hoses in place you can revert if need be.


    HTH

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    as said thats the vac box, some people leave them connected and others bypass them when they nacker up and have no issues and other people have issues. just hit and miss tbh

    AOC top 15 car at PVS 2009 & 2010
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    and then some ppl bypass them when they are perfectly ok


    then bin the vac box when rebuilding........


    mmh maybe i need to plan my mods a little better in future

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    Dave V6's Avatar
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    aaah thats what i was wondering, i have a spare front bcs and i was thinking about fitting it to the rear to see if it helps anything....so this idea is possible then ?
    can anyone explain the purpose of the vacuum box and what happens if its broken, i would sooner leave it in there tbh as vauxhall designed it that way.

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    when they go wrong the main problem people seem to notice is they have problems with the aftermarket dump valve not working correctly.

    AOC top 15 car at PVS 2009 & 2010
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