DATA LOG HELP
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This is a discussion on DATA LOG HELP within the New Member Hangout forums, part of the Community - Meet other Enthusiasts category; Hey folks I just installed a cobb catted downpipe and an aem CAI on my 13 wrx. After that I ...

  1. #1
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    Exclamation DATA LOG HELP

    Hey folks I just installed a cobb catted downpipe and an aem CAI on my 13 wrx. After that I upload the stage 2 AEM 91 octane map onto the car. I did a few runs and the car seems to be running decent. It has a bit of hesitation though which I'm not sure what causes that. I uploaded my data logs below if you all wouldn't mind viewing and helping tweak. The other half of the chart starts at slide 12. Much appreciated thank you!

    https://docs.google.com/file/d/0B6hx...it?usp=sharing

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  3. #2
    Registered User anpato's Avatar
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    Log these parameters instead

    A/F Learning #1 (%)
    A/F Sensor #1 (AFR)
    Engine Speed (RPM)
    Engine Load (1 byte) (g/rev)
    Fine Learning Knock Correction (degrees)
    Feedback Knock Correction (degrees)
    IAM
    Ignition Total Timing
    Injector Duty Cycle (%)
    Intake Air Temperature
    Manifold Relative Pressure (corrected) (PSI)
    Mass Airflow (g/s)
    Mass Airflow Sensor Voltage.
    Primary Wastegate Duty Cycle (%)
    Throttle Opening Angle (%)
    Vehicle Speed (mph)

    Since the car is maf based, the maf is what controls AFR, i had the same issue, just have to go in and rescale the maf, but your kinda shooting in the dark without a wideband
    2013 SWP WRX Sedan
    Hillside, NJ
    Invidia Catless Downpipe, Custom Short Ram Intake, Self Tuned Using ECU Flash, Romraider and Tactrix

  4. #3
    Master Baiter EJ257's Avatar
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    Quote Originally Posted by anpato
    Log these parameters instead

    A/F Learning #1 (%)
    A/F Sensor #1 (AFR)
    Engine Speed (RPM)
    Engine Load (1 byte) (g/rev)
    Fine Learning Knock Correction (degrees)
    Feedback Knock Correction (degrees)
    IAM
    Ignition Total Timing
    Injector Duty Cycle (%)
    Intake Air Temperature
    Manifold Relative Pressure (corrected) (PSI)
    Mass Airflow (g/s)
    Mass Airflow Sensor Voltage.
    Primary Wastegate Duty Cycle (%)
    Throttle Opening Angle (%)
    Vehicle Speed (mph)

    Since the car is maf based, the maf is what controls AFR, i had the same issue, just have to go in and rescale the maf, but your kinda shooting in the dark without a wideband
    Way too many parameters on the Cobb AP, bud...

    None of the AFR parameters should be bothered with; at WOT, AF Learning is disabled, and the front O2 sensor is meaningless.

    IAM is referred to as DAM on Cobb.

    I'd verify IATs (take a mental note) during cruise and leave it off the log.

    I wouldn't bother with either of the MAF variables; you're not doing MAF scaling without a WBO2.

    Vehicle Speed is a completely wasted parameter.

    For a general all-purpose log, select only the following parameters:
    RPM (RPM)
    Calculated Load (g/rev)
    Dyn. Adv. Mult. (DAM)
    Feedback Knock ()
    Fine Learn Knock ()
    Ignition Timing ()
    Boost (PSI)
    TD Boost Error (PSI)
    Wastegate Duty (%)
    Throttle Pos (%)

    Based on what you gather from that log, we can do a more in-depth log to help better determine the root cause of the issue.
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

    UNYSOC

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    https://docs.google.com/file/d/0B6hx...it?usp=sharing

    https://docs.google.com/file/d/0B6hx...it?usp=sharing

    Two data logs to view. I will go now and get the second list of data and log it.

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    Master Baiter EJ257's Avatar
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    To follow up with my previous post, you don't mention where the hesitation is. Is it at part-throttle or full-throttle? What we're looking for is to capture the hesitation event in the datalog.

    For WOT data logs, 2K-redline in 3rd gear. I also like to verify 4th gear on the 5M/T, so I usually ask for 4th gear pulls from 2K to 4-4.5K.

    Quote Originally Posted by 13swrx
    https://docs.google.com/file/d/0B6hx...it?usp=sharing

    https://docs.google.com/file/d/0B6hx...it?usp=sharing

    Two data logs to view. I will go now and get the second list of data and log it.
    It appears you have a bit of a boost oscillation going on, which could account for the "hesitation" you're feeling. I'd be curious to see the logs with the fewer parameters, as it'll offer a bit better resolution.
    Last edited by EJ257; 09-08-2013 at 10:13 AM.
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

    UNYSOC

  7. #6
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    EJ257 here is a 3rd gear and a 4th gear pull for you. I believe the hesitation is just the turbo lag off the hop. That may be what I'm feeling.


    https://docs.google.com/file/d/0B6hx...it?usp=sharing

    https://docs.google.com/file/d/0B6hx...it?usp=sharing

  8. #7
    Master Baiter EJ257's Avatar
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    Quote Originally Posted by 13swrx
    EJ257 here is a 3rd gear and a 4th gear pull for you. I believe the hesitation is just the turbo lag off the hop. That may be what I'm feeling.
    Not really following "off the hop". You just mean from when you hit the throttle to when boost kicks in?

    In the 3rd gear log, you can see that your car pulled a little bit of timing right after stabbing the throttle. That's not totally uncommon, and likely an issue with tip-in enrichment tables.

    The 4th gear log, you'll notice that you pulled a little bit of timing in the 2.8g/rev and 2600RPM range. Likely, there may be some work to do with the ignition timing tables, but unless you're consistently pulling timing, you shouldn't be adjusting those tables.

    Boost oscillation doesn't look as bad (only really had it in the 4th gear pull, but it was minor compared to previously).

    In the future, do not bother with the Target Boost parameter.
    2005 WRX STi (Mods | Virtual Dyno)

    Resident Tuner @ WTF Tuning, LLC

    "Never trust anything that bleeds for a week and lives ..."

    UNYSOC

  9. #8
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    Sent you a pm.

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