Engine help: major under boost - Page 2
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This is a discussion on Engine help: major under boost within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by ElusiveSAV I had help from turbotec ray and Zax. Couldn't have done it without the help of ...

  1. #16
    Master Baiter EJ257's Avatar
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    Quote Originally Posted by ElusiveSAV
    I had help from turbotec ray and Zax. Couldn't have done it without the help of this forum!
    Mattypants got snubbed...
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  3. #17
    Registered User ElusiveSAV's Avatar
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    Quote Originally Posted by EJ257 View Post
    Mattypants got snubbed...
    sorry buddy haha, I added " couldn't have done it without the forum"

  4. #18
    Master Baiter EJ257's Avatar
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    Quote Originally Posted by ElusiveSAV
    sorry buddy haha, I added " couldn't have done it without the forum"
    I was being facetious. I'm just glad you figured out the problem.
    2005 WRX STi (Mods | Virtual Dyno)

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  5. #19
    Registered User ElusiveSAV's Avatar
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    Quote Originally Posted by Liquid2k View Post
    Sounds like you're reading wastegate spring pressure... If you want an informative thread on how boost works on our cars, check out this link from cobb: https://cobbtuning.zendesk.com/entri...l-System-Works

    Also, here is a flow chart that you may find useful for troubleshooting your problem:

    My buddy just had the same issue with his STi, result was a missing restrictor pill in one of the lines from the BCS. I highly doubt flashing to stock will yield any helpful results.
    That's what it was. Missing restrictor pill. Parts ordered. going to Subaru weds for some other things.

  6. #20
    Registered User ElusiveSAV's Avatar
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    So that wasn't the issue. FML. Sitting in subaru's service department. Dunno what else to tell them. Still only getting 9lbs of boost. HELP

  7. #21
    Registered User ElusiveSAV's Avatar
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    So Subaru mechanic had the pill hose on the wrong side. Had to show him the diagram. Now I'm boostin around 14.9 target is 17. Ran a hwg map provided from Cobb and it produced more than the normal one. Still under boosting by 2 psi. Normal for OTC tune? Checked all my hoses to make sure they were ok. So I don't know what the issue is now. Any help?

  8. #22
    Registered User ElusiveSAV's Avatar
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    Talked to a tuner friend. He thinks I blew the ring lands. He told me to open my oil filler while the car was warm and if it smelled like exhaust fumes that that will prolly be my problem. And it smells like pure gas/ fumes. So I imagine its blown ring lands?

  9. #23
    Pro Manscaper Mikie13's Avatar
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    Blown ring lands don't affect manifold pressure, which is what your boost reading should be.

    If you suspect engine failure at that point, do a compression test.

    I didn't see if you actually checked the TMIC coupler/connection to see if that was tight or not. That's a common source of a boost leak.
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  10. #24
    Subaru Newb MainFrame's Avatar
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    Opening the oil filler isn't going to do anything .. if you suspect a cracked piston then you need to do a compression test.

  11. #25
    Registered User ElusiveSAV's Avatar
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    Which coupler should I check. All the connections to the TMIC?

  12. #26
    MAINEiac 11blackSTi's Avatar
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    Quote Originally Posted by ElusiveSAV View Post
    Which coupler should I check. All the connections to the TMIC?
    Check all of the connections.

  13. #27
    Sammich Makin' Pwincess wrxtreme06's Avatar
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    Quote Originally Posted by ElusiveSAV View Post
    Still under boosting by 2 psi. Normal for OTC tune?
    target boost for the 91 OCT stage 1 map is: 15.0 psi peak boost pressure tapering down to ~ 13.0 psi by the 7000RPM redline, +/- 1.0psi

    target for 93 OCT stage 1 map is: 16.5psi peak boost pressure tapering down to ~13.5psi by the 7000RPM redline, +/- 1.0psi

    depending on what map you're running, your numbers dont seem too off.

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  14. #28
    Registered User ElusiveSAV's Avatar
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    Quote Originally Posted by wrxtreme06 View Post
    target boost for the 91 OCT stage 1 map is: 15.0 psi peak boost pressure tapering down to ~ 13.0 psi by the 7000RPM redline, +/- 1.0psi

    target for 93 OCT stage 1 map is: 16.5psi peak boost pressure tapering down to ~13.5psi by the 7000RPM redline, +/- 1.0psi

    depending on what map you're running, your numbers dont seem too off.
    My target is fine. My actual boost is what is off.

  15. #29
    Registered User ElusiveSAV's Avatar
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    I'm running stage 1 + sf intake 93 Cobb map.

  16. #30
    Registered User ElusiveSAV's Avatar
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    Anyone know of any how to videos to do a compression tests on a 2011 wrx?

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