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This is a discussion on Boost fluxuating, data log within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; will do thanks...

  1. #31
    Supporting Member yamaha_rider619's Avatar
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    will do thanks
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  3. #32
    Moderator Donkey's Avatar
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    The 06+ WRX turbos are slightly different than the 02-05 WRX turbos. You can try swaping the wastegate actuator from your old turbo to the new one and see what happens. That is one difference,the preload in the actuator. The other main one is the wastegate ramp in the turbine section. You should have also observed that the compressor housing outlet is slightly shorter as well.
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  4. #33
    Supporting Member yamaha_rider619's Avatar
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    How hard would it be to swap the wastegate actuator?

    "The other main one is the wastegate ramp in the turbine section."
    Is this a problem?
    Josh
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  5. #34
    Master Baiter EJ257's Avatar
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    Quote Originally Posted by yamaha_rider619
    How hard would it be to swap the wastegate actuator?
    Not difficult. Probably a half hours worth of work.
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  6. #35
    UnBanned Sinister's Avatar
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    how about a pro-tune?
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  7. #36
    Admiral Ackbar mycologist's Avatar
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    The old one seems like it was having problems though.

    Why not just try tightening it a half turn at a time - just make sure it doesn't start spiking or overboosting anything.

    I'd get a 3-port BCS if going to the trouble of a protune.
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  8. #37
    Supporting Member yamaha_rider619's Avatar
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    I agree with the old one seeming bad.

    which way would i turn it, clockwise or counter? EDITI saw you said tighten)

    Also how would i know if it is spiking and over boosting? Would the overboosting be over the suggested 15psi?

    Oh and im assuming since no one said anything, is it okay to drive? As long as i dont push full boost?
    Last edited by yamaha_rider619; 08-19-2010 at 09:25 PM. Reason: realized i cant read
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  9. #38
    UnBanned Sinister's Avatar
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    Quote Originally Posted by mycologist View Post
    I'd get a 3-port BCS if going to the trouble of a protune.
    absolutely
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  10. #39
    Admiral Ackbar mycologist's Avatar
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    Quote Originally Posted by yamaha_rider619 View Post
    I agree with the old one seeming bad.

    which way would i turn it, clockwise or counter? EDITI saw you said tighten)

    Also how would i know if it is spiking and over boosting? Would the overboosting be over the suggested 15psi?

    Oh and im assuming since no one said anything, is it okay to drive? As long as i dont push full boost?
    Spiking as in it overspools up to e.g. 18 or more briefly before settling at 15 or overboosting as in exceeding the target or possibly running away (basically creeping).

    You need to read the user guide and figure out how to change what you are logging. "DAM" is the best indicator of how safe you are running, along with knock correction.

    http://www.accessecu.com/support/docs/DataLog.html

    http://www.3gwrx.com/forum/index.php?topic=8062.0;wap2

    You should be logging the following:

    RPM (RPM) [AP] or Engine Speed (RPM) [RR]

    Calculated Load (load) [AP] or Engine Load (1 byte) (g/rev) [RR]

    Dyn. Adv. Mult. (DAM) or IAM [RR]

    Knock Learning (deg)[AP] or Fine Learning Knock Correction (degrees)[RR]

    Knock Correction (deg)[AP] or Feedback Knock Correction(degrees)[RR]

    Throttle Position (%)[AP] or Throttle Opening Angle(%)[RR]

    Boost (PSI)[AP] or Manifold Relative Pressure(corrected)(PSI)[RR]

    Mass Airflow (g/s)[AP&RR]

    Wastegate Duty (%)[AP] or Primary Wastegate Duty Cycle(%)

    Turbo Dynamics (PSI)[AP]

    Target boost or boost error (only need one)

    You should also be checking for A/F corrections but I'd do that in a separate log without the WGDC, Boost error, and Turbo dynamics (to increase resolution). Add injector duty cycle for that.


    It should be safe to log that now given your boost is so low, but check to see that your DAM is up (16 is max on your car, less is not good) before doing a pull. Figure out how to do that and post it up or there is really no way to tell other than just tinkering around.
    "From a little spark may burst a mighty flame." - Dante
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  11. #40
    Moderator Donkey's Avatar
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    Who installed the turbo?
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  12. #41
    Supporting Member yamaha_rider619's Avatar
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    I installed the turbo
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  13. #42
    Supporting Member yamaha_rider619's Avatar
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    I just spoke with cobb and they told me to try a restrictor pill from a 2006 wrx and that should fix the issue.

    2003-2005 WRX WGDC Tables
    Stock restrictor pill size = ~.047
    Factory wastegate pre-tensioned to ~6psi

    2006 WRX WGDC Tables
    Stock restrictor pill size = ~.028
    Factory wastegate pre-tensioned to ~6psi.


    If it doesnt he said to get a 3 port bcs and a pro-tune.

    What do you guys think about trying the 06 restrictor pill?
    Last edited by yamaha_rider619; 08-20-2010 at 09:23 AM.
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  14. #43
    Registered User teflon_jones's Avatar
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    Quote Originally Posted by yamaha_rider619 View Post
    I just spoke with cobb and they told me to try a restrictor pill from a 2006 wrx and that should fix the issue.

    2003-2005 WRX WGDC Tables
    Stock restrictor pill size = ~.047
    Factory wastegate pre-tensioned to ~6psi

    2006 WRX WGDC Tables
    Stock restrictor pill size = ~.028
    Factory wastegate pre-tensioned to ~6psi.


    If it doesnt he said to get a 3 port bcs and a pro-tune.

    What do you guys think about trying the 06 restrictor pill?
    I think you should listen to what Cobb says. Did you talk to Chris there?
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  15. #44
    Supporting Member yamaha_rider619's Avatar
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    I don't know who i talked to, i called the location in Plano, Texas. Do you know which one Chris works at or have his number?
    Josh
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  16. #45
    Admiral Ackbar mycologist's Avatar
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    Definitely sounds worth a try. I didn't know they came with different sizes.

    The smaller restrictor pill will limit the amount the BCS sees, so it can bleed off pressure more efficiently before sending it on to the wastegate actuator. That should drop WGDC and increase boost. I'd still watch closely and the log I suggested is still a very good idea.

    If it doesn't work you could also just run the line straight from the turbo to the wastegate actuator and figure out what pressure it runs on its own. Or as we said before, just get the 3-port. XPT has a map for it so you could do an etune with them.
    "From a little spark may burst a mighty flame." - Dante
    "The stitch is lost unless the thread is knotted." - Italian proverb

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