Trouble with boost.
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This is a discussion on Trouble with boost. within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So I have been working with an anonymous etuner to tune and now diagnose my car. The problem I've been ...

  1. #1
    Registered User Random2006's Avatar
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    Trouble with boost.

    So I have been working with an anonymous etuner to tune and now diagnose my car. The problem I've been having is I'm not getting close to hitting target boost. My current tune is set to just under 19 psi. I've only been hitting around 8 or so. I replaced boost control with another Oem one and nothing changed. I have tried with and without restricor pill which my tuner told me he tuned it for the removal of it and the psi changes by a couple when I add it back but still well under target and it cuts out. Without it it's smooth but I stay under 8. My tuner thinks I have a bad wastegate but I'm getting conflicting stories from other forums. My tuner tried to tune it for use without the wastegate vacuum connected but it was unstable and resulted in overboosting. Now he is advising me to purchase a manual boost control so I can run stable without a wastegate. Just wanting some thoughts from the forum here. No vacuum leaks and adjusting wastegate actuator arm only had minimal results.
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

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  3. #2
    Good news, everyone! xxxxxxxAnub1s's Avatar
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    You need a new tuner.
    Cody
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  4. #3
    Registered User Random2006's Avatar
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    At this point I'm still kinda wondering what to do. Going to try flashing back to stock to see what results I can come up with. Other forums say if you overboost with the we disconnected then its ok. So I have a hard time believing that's it. Yet with it disconnected he was able to tune it where I was hitting just over target and getting cut. So it seems I would be able to hit target with a Mbc tuned for lower boost. Just really wanting to straighten out which is true.
    Last edited by Random2006; 09-02-2013 at 06:21 AM.
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

  5. #4
    Moderator Donkey's Avatar
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    If you understood how the wastegate system works you would see very clearly that it is impossible to tune boost if you have completely removed the vacuum source from the wastegate actuator. The boost will be completely unpredictable and uncontrollable. The ECU has the ability to disable the boost controller and run wastegate boost if the IAM drops bellow a certain point. I would check the IAM. If everything is fine then I would test the boost control solenoid and then test the harness for power. Also check for a boost leak. If there was an issue with the boost control I would not have even tuned the car without fixing that issue first.
    Resident Adviser @ WTF Tuning, LLC
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  6. #5
    Registered User Random2006's Avatar
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    Thanks for the input. It could just be me making assumptions because what my tuner advised me to do was to completely disconnect the vacuum lines from the boost controller. Just from what I've read I couldn't wrap my head around the process of running without the boost controller. And I had swapped out the boost controller with another stock one but that maybe where my issue still is. I think maybe I've had some miscommunication with my tuner and I should try the mbc
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

  7. #6
    Registered User Random2006's Avatar
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    Problem ended up being the Bosch spark plugs I had. Replaced with NGK and now I'm running full boost.

    Sent from my SCH-I535 using Tapatalk
    Stephen
    http://forums.nasioc.com/forums/showthread.php?t=533787 <--- Good Info
    2002 Impreza WRX "BugEye"

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