Cobb Stage 2 Data Log
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This is a discussion on Cobb Stage 2 Data Log within the Tuning: Electronic Engine Management forums, part of the Tech & Modifying & General Repairs category; Have not been around the forum for a while. Over the weekend I went to Cobb Stage 2 (Accessport Severe ...

  1. #1
    Registered User jas280z's Avatar
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    Question Cobb Stage 2 Data Log

    Have not been around the forum for a while. Over the weekend I went to Cobb Stage 2 (Accessport Severe Low Waste Gate 93 3.11 Map, SF Intake, Cobb TBE) from Stage I (Accessport Low Waste Gate 93 3.11 Map, SF Intake, stock TBE). This is on a 2012 WRX.

    I initially had the Low Waste Gate map when I did the switch to Stage 2 (was getting slight overboost on standard map at stage 1). On one of my initial test runs, I hit 20 psi with the Low Waste Gate (not logging at the time), so I switched to Severe. I always run 93 Octane, either from Sunoco or local Tops gas stations (Tops uses Reid Petroleum, I know the Reid family and trust their product).

    The included logs here are with about 100 miles on the Severe Low Waste Gate tune. The current temp is ~24 F.




    The first log is a 2nd gear pull, as I want to keep my driving mostly legal.

    https://docs.google.com/spreadsheet/...EE&usp=sharing

    This log looks pretty good to me, boost is climbing and tapering as I expect it would, there are only a couple instances of slight Feedback Knock and no Fine Knock Learn.

    Based on this video, I am happy with this pull. https://www.youtube.com/watch?v=rjEGZ-4dsDY



    The second log has me more concerned.

    https://docs.google.com/spreadsheet/...3c&usp=sharing

    This log was take directly after the first, as I drove along a 55mph highway and a 65 mph highway.

    The concerning bit is way down around row 611. I was anticipating the increase in speed limit from 55 to 65. I down shifted to 3rd from 5th and accelerated. it appears that I overshot the top limit of my boost target (19.5 psi) from 3900 to 4900 rpm.

    Everything else during the overboost looks okay based on what I know. The wastegate was only at around 50% duty cycle, so I am hoping that this is something that can be corrected with more duty cycle during these conditions.



    My plan is to get the car protuned at Innovative Tuning in a little while, once my bank account recovers a little bit, but if need be I have no problem affording the protune asap. Pretty much I am hoping that you guys can take a look at this and give me your 2 cents about these logs, as I am still a relative novice with the logs.

    For the meantime, I will avoid WOT down shifts to limit the chance of overboost.

    Thanks,

    -John
    2012 Base WRB WRX Hatch Stock
    1978 Datsun 280z Fully restored and lightly restomodded: http://www.zcar.com/members_rides/no..._890384.0.html

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  3. #2
    Registered User jas280z's Avatar
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    So I have been doing a ton of reading today, seems like my issue in the second log could be boost creep, makes sense with the freer flowing intake and exhaust plus the low temps.

    May look into an ebcs to go with that protune. Really don't want to do an ewg, this is my dd, I'd sacrifice overall power before going that route.
    2012 Base WRB WRX Hatch Stock
    1978 Datsun 280z Fully restored and lightly restomodded: http://www.zcar.com/members_rides/no..._890384.0.html

  4. #3
    Village Idiot McBill's Avatar
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    My only question to you regarding the boost creep is what downpipe are you running? If it is catless that may be what is causing your boost creep. If it is catted, then I'm not quite sure what would be causing it.
    2011 WRB WRX Sedan - Q300, Invidia Catted Downpipe, Cobb RAM Intake w/Box, Protuned buy TiC
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  5. #4
    Registered User jas280z's Avatar
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    I am running the full Cobb TBE, including the catted down pipe. I am thinking that the 20 degree temps are a catalyst for creep, if that is what I am experiencing.
    2012 Base WRB WRX Hatch Stock
    1978 Datsun 280z Fully restored and lightly restomodded: http://www.zcar.com/members_rides/no..._890384.0.html

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