Something doesn't seem right..
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This is a discussion on Something doesn't seem right.. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So I recently bought an '04 WRX, all stock with 85k miles. First off, I've never owned a turbo car ...

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    Something doesn't seem right..

    So I recently bought an '04 WRX, all stock with 85k miles. First off, I've never owned a turbo car myself, I've driven a few STIs and a few other boosted cars, but this is my first personal ride. Anyway, I'm curious if my car is spooling properly of if I have a boost issue.. it just feels like my boost falls off sooner than it should and doesn't spool enough in certain gears such as 2nd. Am I just not used to having a turbo, meaning this is normal for these cars, or is there anything I should be concerned with and need to start checking things? The highest numbers I've seen is 7lbs at 5000rpm in 3rd gear..

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    He simply abides. SD_GR's Avatar
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    That's waste gate pressure. Something sounds wrong.
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    Yep. My bet is the ECU has pulled boost.
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    So what would be my best plan of action?

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    zax
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    Take it to someone who can troubleshoot the problem. These things are usually due to:

    1. Incorrect fuel/timing map for modifications
    2. Failure to use Premium fuel
    3. Gross vacuum leak
    4. Failure of primary sensors or knock sensor
    5. Dirty MAF or incorrect O2 sensor

    You say the car is unmodified. Are you certain? Are you sure the ECU has not been reflashed with an improper map?
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    Registered User nsibanez's Avatar
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    To add in the car may now be unmodified but was at one point with the old map still flashed
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    I'd check the boost control lines for cracks. At that age I wouldn't be surprised.

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    zax
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    Ah true. Or a missing restrictor pill
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    I can't speak for the previous owner but I only use 93 octane fuel and I actually just cleaned the MAF so those 2 are out, but it sounds like I need to take it to someone who can check the map and the boost control lines . Thanks guys.

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    My bet: Vac lines or BCS.
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    I talked to a buddy that works on turbos and actually used to own a bug eye WRX and he thinks it may be vacuum related also. Just curious but what kind of boost numbers should I be expecting out of a stock setup?

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    Admiral Ackbar the 1st mycologist's Avatar
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    Quote Originally Posted by mikestripes View Post
    I talked to a buddy that works on turbos and actually used to own a bug eye WRX and he thinks it may be vacuum related also. Just curious but what kind of boost numbers should I be expecting out of a stock setup?
    12-14 psi.

    These are the lines that matter. Check the line with the restrictor pill (feel for one) as well. Otherwise the boost control solenoid usually sticks closed.

    "From a little spark may burst a mighty flame." - Dante
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