Thread: vacuum under boost help

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  1. #1 vacuum under boost help 
    SE Level Member Loftus1995's Avatar
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    I am trying to finish up my build, a few more parts but I am stumped on how vacuum works with turbo boost. I have seen online that a few builds have one or two vacuum blocks. I currently only have one but I may have been unprepared when trying to figure all of this out. I am following a diagram on Autozone website, obviously this doesn't include the turbo vacuum lines I will need to run.... Just looking for a little assistance on how I need to run these lines to one/two blocks.

    https://www.autozone.com/repairinfo/...00c15280217d39

    Attached are photos as well, as what I believe will need to be hooked up to the block.

    First photo: Throttle body
    Second photo: Intake manifold
    third photo: I believe this is supposed to be a breather but am not 100%
    fourth photo: Master Cylinder, also can this be to the block or will this have to get it's vacuum directly from the engine?
    fifth photo: Lower intake manifold, again not sure if this can be blocked off or if i will need it
    sixth photo: fuel pressure regulator
    final photo: This is on the exhaust side of the turbo, now does this go to the vacuum block or how do these connect?









    Again thanks for any help, I just want to make sure I am doing this correct before I go and screw up everything I have tried to do.

    ~Daniel
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  2. #2 Re: vacuum under boost help 
    GXP Level Member GTPpower's Avatar
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    The throttle body is for evap. I would leave it plugged and delete evap.

    The intake manifold will be your main source of vacuum. You should feed your brake booster and vac block with this.

    I think the little nipple on the intake is used if you want a functional pcv. If you blocked the pcv and are using a valve cover breather, you can just leave that nipple plugged.

    You lower intake nipple is used to feed a map and the fuel pressure regulator, so you can use it for that, or plug it and use your vac block for those.

    The bottom port of your wastegate connects to the nipple on your compressor. The top is vented to atmosphere, unless you are using a boost controller. The top line connects to the boost controller if you have it.


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