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Thread: How To: Boost Pressure Tester

  1. #1
    Super Moderator LinuxRacr's Avatar
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    How To: Boost Pressure Tester

    This is a small how-to that is designed to show you how to make a basic boost pressure tester.

    1. Depending on what the size of your compressor inlet on your turbo is, you will need to get about a 2-3 inch section of silicon or rubber coupler hose. I was able to source a 3 inch diameter coupler at AutoZone picutred below. Notice that there is a black reducer ring in there so that one is enabled to connect to a 2.5 inch pipe as well. It comes with worm clamps as well.

    $4.00




    Next, I went to Home Depot and souced a 3 inch knock-out cap from the plumbing/PVC section.

    30 Cents. Ea.





    The next thing to do is to drill a 5/16 inch whole in the 3 inch knock-out cap so that the valve stem below can go thru the whole. A multi-step drill bit is perfect for this, but not that cheap.

    $3.00



    Since the knock-out cap isn't that thick, you may want to wrap a "few" turns of teflon tape around the base of the valve stem to get a better seal. (I couldn't source a deeper cap that fit)

    The next thing I did was put the cap with the stem installed on one end of the coupler, and clamp it down tight enough so that it won't pop off:





    For ease of use, I decided to install the tester on the 2.5 inch intake pipe, instead of directly on the 3 inch inlet of the GT-28RS. The black reducer ring that came with the coupler was key:






    BE AWARE THAT IF YOU DO THIS, IT IS AT YOUR OWN RISK!!! I WILL NOT BE HELD LIABLE FOR ANY DAMAGES! DO NOT TURN ON YOUR CAR'S ENGINE WHILE DOING THIS!!!
    Last edited by LinuxRacr; 11-28-2006 at 03:59 PM.
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  2. #2
    Super Moderator LinuxRacr's Avatar
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    Using an air comressor, and the tire inflator attachment, pressurize with about 10-15 PSI into your intake trac. Listen all around for leaks. They will be very audible, and a hisssing sound. Listen around your intercooler, your intake pipes and couplers, and your intake manifold, and throttle body gaskets.
    Last edited by LinuxRacr; 11-14-2006 at 12:57 PM.
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  3. #3
    ZOOM ZOOM BOOM BOOM CLUB mazdaspeed75's Avatar

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    good write up
    Bossier city, la

  4. #4
    ZOOM ZOOM BOOM BOOM CLUB mazdaspeed75's Avatar

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    or put in soem seafoam and watch fro all th esmoke that comes out around things ,
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  5. #5
    25ish_psi shane02pro5's Avatar


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    Spray bottle with soapy water helps pinpoint.

    I did two sizes one for my throttle body which helped my find a large leak at my injectors and intake manifold at the top to bottom seam. Then I checked my intake system separately and found one at my HKS SSQV at the adjustment screw.

  6. #6
    Super Moderator LinuxRacr's Avatar
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    Two other excellent methods.
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    Registered Member yashart@work's Avatar


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    Or, if you are extremely lazy and dont want to make your own, you can just buy this:



    $30 from www.siliconeintakes.com
    yashart@work = yashart_mp3 at work

  8. #8
    Super Moderator LinuxRacr's Avatar
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    Quote Originally Posted by yashart@work
    Or, if you are extremely lazy and dont want to make your own, you can just buy this:



    $30 from www.siliconeintakes.com
    This is what I wanted to avoid. It is also why I posted the prices of the parts for mine..lol!
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    AFCed Since 8/25/07 Alejo_NIN's Avatar

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    I AHVE A QUETSION...
    it might be stupid..but...the throttle body is the only one closing the other side right??
    and the throttle body is shut tightly enough to prevent leaks form that side?
    it looks like a good idea to check for leaks when yo suspect a kit of having badly welded pipes or just tro make shure everything is in top working condition...BOV leaks come to mind as stated by the how-to writer..

  10. #10
    25ish_psi shane02pro5's Avatar


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    The throttle plate does not close completely and beyond that the intake and exhaust valves are never closed all the way all at once. But this is enough to be able to find leaks. I cap my intake piping at the throttlebody end to separate and make it a little easier to pinpoint. I also swapped the valve stem for a barb and hose attached to a regulator.

  11. #11
    Boostd & it feels so good Moeed's Avatar

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    Nice write up man!
    http://dfwmazdas.com



    MSP Swap with MPNick upgrade , ION FMIC, ION CAI, MPI TUNER and extra injectors , AWR Competition Radiator with custom fan shroud, J&S safeguard , zeitronix w/b with all the extras, blitz DSBC at stock and 9 pounds, Front and rear mount 90 durameter, Intake manifold clean up, and 3" mandrel bent exhaust with ghl d/p. Custom carputer (thanks elemental)

  12. #12
    One Trick Pony atticus1398's Avatar
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    Quote Originally Posted by yashart@work
    Or, if you are extremely lazy and dont want to make your own, you can just buy this:

    $30 from www.siliconeintakes.com
    LOL, thats great, I may have to order this when I order new t-bolts, they keep loosening.

    Great write up Linux. Perrin told me that they test theirs to 40psi. (I think intercooler only). So I wont be worried about 15psi.
    Last edited by atticus1398; 11-14-2006 at 10:12 PM.

  13. #13
    Banned Brian MP5T's Avatar
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    Nice Read..

  14. #14
    One Trick Pony atticus1398's Avatar
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    it's ok to pressurize before the turbo? I was thinking of starting at the turbo side of the hot pipe.

  15. #15
    Super Moderator LinuxRacr's Avatar
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    It doesn't matter.
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