Boost drift?
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This is a discussion on Boost drift? within the Engine Performance forums, part of the Tutorials & DIY category; I have this problem with my 02 wrx wagon. (Flex up pipe, cat back exhaust, BOV, otherwise stock, no tune) ...

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    Boost drift?

    I have this problem with my 02 wrx wagon. (Flex up pipe, cat back exhaust, BOV, otherwise stock, no tune) Even at wide open throttle, it produces very little boost (negative numbers) in most gears. In 3rd and 4th, it might get up to 5-8psi but then drifts down while I am still at WOT. I am sure this topic is discussed here but I really don't know what to call it, so I can't search for it. If anyone knows what this is called, please let me know.

    THanks

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    It's supposed to. Though you're not making full boost.

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    With a title like that i thought this was gonna be the funniest story ever

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    Sound like ur running wastegate pressure. Do u still have a restricter pill in the hose going to the wastegate.

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    Quote Originally Posted by 06wrxSRH View Post
    Sound like ur running wastegate pressure. Do u still have a restricter pill in the hose going to the wastegate.
    I'm not sure what that is, but I'm going to look it up.

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    There is a little restrictor pill inside the hose that says line 1. It help tell your wastegate how much boost to make or something like that. But if you dont have that pill in there you will only run your wastegate spring pressure. Which is right around 5 to 8lbs.
    Attached Thumbnails Attached Thumbnails 07subaruservicebulletinqv5.jpg  

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    Great picture, thanks. The pill is there. I removed the line and just felt of it, about half way there was a hard bump. I am assuming that is it. I noted something else from the picture though. My line 3 has an extra piece in it. It is right next to the "T" and is about 2 inches long. I wonder why it's there? What purpose would it serve? I do know that at some point this car had a manual boost controller, that was removed.

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    What do u mean an extra piece. Do you have the stock BPV if so you so should put that back on, it way better for the engine. Check all your vac lines for a leak, it could even be your bov that is leaking. Did this just start or did you do something to it, how did u notice it. Is your boost gauge a vac and boost or just a boost. If its a vac and boost is your vac reading normal.

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    Quote Originally Posted by 06wrxSRH View Post
    What do u mean an extra piece. Do you have the stock BPV if so you so should put that back on, it way better for the engine. Check all your vac lines for a leak, it could even be your bov that is leaking. Did this just start or did you do something to it, how did u notice it. Is your boost gauge a vac and boost or just a boost. If its a vac and boost is your vac reading normal.
    Well, there is a 2 or 3 inch section of hose attached to the wastegate solenoid on one end and to line 3 via a straight connector on the other.

    I am looking for a stock BPV, everyone says to take off the one I have but I have to replace it with something.

    How do you check for leaks? With a pressure tester of some sort? I have visually inspected them and they look fine.

    I got the car just like it is, it has been doing this all along.

    The boost gauge is vac and boost. It stays in the neg pressure range most of the time. I have wondered if it is calibrated correctly though because I hear the BOV exhaust when the gauge is reading neg pressure.

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    I would get a BPV asap if you can hear it anytime besides in between shift thats not good.

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