Commanding 11 afr and getting 11.7?

Discussion in 'Mazdaspeed 3/6 ECU Tuning' started by mazdas4me, Apr 11, 2017.

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  1. AYOUSTIN

    AYOUSTIN Greenie Member

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    That doesn't make sense. You should be able to do 100 revisions and it should never get worse. You said that making changes does nothing so how does it get too far off after 6 revisions?
     
  2. mazdas4me

    mazdas4me Greenie Member

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    The maf curve gets way off in the spots I keep adjusting.
     
  3. AYOUSTIN

    AYOUSTIN Greenie Member

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    This might come off a bit stupid but are you sure you're adjusting in the right direction?

    Also, have you changed ALL of your fueling tables for the corresponding loads? The ECU might be looking up a table that you don't think it's using at that time, happens a lot. Make sure all of your WOT tables (knock and BAT tables are all right) also be sure to adjust the upper load portions of your CL table as well.
     
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  4. Jason@DizzyTuning

    Jason@DizzyTuning Approved Vendor

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    Also check your CL Max Load tables. Those can cause some wonky behavior when over 2.5 load (I didn't look at log).
     
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  5. udntknw

    udntknw Silver Member

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    He's barely over 2.0. And the logged MafV/gs seem to be consistent with a stock sized MAF. More specifically with Cobbs MAF scale. Also seem to tend pretty close to his 2007 MS3 log, which I assume to be stock sized MAF.

    @mazdas4me I hate to ask the dumb question, but you did copy the values into both MAF tables?

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    --- Double Post Merged, Apr 14, 2017 ---
    Have you checked your exhaust? prior to O2 sensor? possibly a leak?
     
    udntknw, via a mobile device, Apr 14, 2017
    #45
  6. mazdas4me

    mazdas4me Greenie Member

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    Here is my copy of my ATR, e17 map, and corresponding data log for anyone wanting to open it and take a look.

    Just unzip, and open the program file, no need to install. It runs independent.

    DO NOT update ATR or it will not open file. I am on the pre ban version of ATR. :)
    --- Double Post Merged, Apr 14, 2017 ---
    Download my ATR and take a look at my fuel tables and let me know if you see anything wrong.
    --- Double Post Merged, Apr 14, 2017 ---
    Yes, copied to maf cal b as well. No exhaust leaks.
     

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    Last edited: Apr 14, 2017
  7. mazdas4me

    mazdas4me Greenie Member

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    1st e30 log using same maf cal and commanded afr as the e15 log. Only diff is load adjusting, Timing, and e30. Looks about the same wot afr as previous. Apparently at least this way of doing it works and is consistent. :) Not bad power so far...
     

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  8. btstarcher

    btstarcher Greenie Member

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    Just a guess but I'd say it's possible you're accumulating an excess of e85 in your tank. Run pump gas for a few tanks then begin again, fresh. Are you mixing the exact ratio every time you get gas?
     
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  9. mazdas4me

    mazdas4me Greenie Member

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    I have a mix calculator so I don't get too much or too little e85.
     
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  10. btstarcher

    btstarcher Greenie Member

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    Have you tested it for ethanol content?

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    btstarcher, via a mobile device, Apr 18, 2017
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  11. mazdas4me

    mazdas4me Greenie Member

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    Yes, 5% ethanol in my 91, and 80% ethanol in the e85
     
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  12. btstarcher

    btstarcher Greenie Member

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    BPV or BOV?

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    btstarcher, via a mobile device, Apr 18, 2017
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  13. mazdas4me

    mazdas4me Greenie Member

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    OEM Bypass or recirc valve
     
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  14. btstarcher

    btstarcher Greenie Member

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    I remember having an AFR issue dealing with my BPV but for the life of me I can't recall what it was LOL.

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    btstarcher, via a mobile device, Apr 18, 2017
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  15. mazdas4me

    mazdas4me Greenie Member

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    I have 2 Speeds, so I have swapped a few things to verify they are good, and the recirc valve was one I swapped with no change. My 09 hits commanded afr almost right on. This 07 is strange. I have a workaround that works great and consistent, but just kinda driving me crazy as to why it won't hit commanded afr.
     
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  16. Fstrnyou

    Fstrnyou Greenie Member

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    Call me crazy, but I do my WOT MAF Cal right after a new flash so there is no trimming going on.

    Also, I do my calibration backwards. Instead of going thru the log line by line and plugging values in the sensor calibration, I look at the voltage value I want to change and find it in the log. If it falls between 2 logged points, I interpolate the correction, then apply it to the table. Seems to be a much quicker method for me.
     
    Fstrnyou, via a Samsung mobile device, May 10, 2017
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  17. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    I didn't read through the whole thread, so forgive me if this has already addressed, but have you already ruled out mechanical issues, such as boost leaks?
     
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  18. mazdas4me

    mazdas4me Greenie Member

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    Yes, triple checked everything. Not worrying about it anymore. I just command richer to get what I need. Strange, but it works. Very repeatable afr every log. Still would like to know why, but not really concerned about it anymore. Making good power for mods I have.
     
  19. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    That's a band-aid, man. I highly recommend getting to the bottom of it. Commanding higher or lower than you really want, AFR-wise, and relying on some unknown issue to correct it is just asking for trouble. I say this having done a lot of tuning and having seen the havoc that AFR issues can wreak on turbo cars. Catastrophic stuff.
     
  20. mazdas4me

    mazdas4me Greenie Member

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    Bandaid or not, it works flawless and I am done trying to figure it out. This is what it wants to run the afr I want, so we are both happy. :)
     
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