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Thread: SMEC Fuel Trim logging

  1. #1
    Garrett booster
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    SMEC Fuel Trim logging

    Is there any way to log fuel trims in a SMEC? I have read all the ram descriptions in MPScan and the ones that indicate they'd log trims are not available with the SMEC as far as I can tell.

    I have hooked my AEM into my SMEC in place of the stock O2 sensor and I would like to get my fuel dialed in. In the past with other cars / tuning software I had used trims to get things close. I would like to use this tool if it's available on the SMEC / MPScan.

    Thanks in advance for any help on this.

  2. #2
    Supporting Member Turbo Mopar Contributor
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    Re: SMEC Fuel Trim logging

    have you looked at the "autocalcellx" locations and the "ValueFromAdaptiveMemory" locations? the first locations mentioned store the modifier for a limited matrix of rpm/map(?) values. the program reads from these cells based on rpm/map(?) and stores it into the second location mentioned which is used for fuel PW. i think this is how it works............
    Last edited by wowzer; 06-06-2018 at 03:08 PM.
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  3. #3
    Garrett booster
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    Re: SMEC Fuel Trim logging

    I will load those up and give them a try. Thank you!

    On an unrelated note. AFF was working then I changed the decimals from two to zero. After that I started getting this error anytime I try to load AFR gauge even after changing it back to two decimal places.

    I reloaded MPScan and selected "repair" and it didn't help.

    Any ideas? I know i'm a pain!
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. #4
    Supporting Member Turbo Mopar Contributor
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    Re: SMEC Fuel Trim logging

    i'll take a look.
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  5. #5
    Supporting Member Turbo Mopar Contributor
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    Re: SMEC Fuel Trim logging

    Update all the layout files.
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  6. #6
    Supporting Member Turbo Mopar Contributor
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    Re: SMEC Fuel Trim logging

    posted new version. let it auto update.
    89 Voyager LE, 2.5T2 - rest in peace
    87 Charger Shelby T2 (2.4 conversion in process)

  7. #7
    Garrett booster
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    Re: SMEC Fuel Trim logging

    Quote Originally Posted by wowzer View Post
    posted new version. let it auto update.
    I loaded MPScan just now and let it sit. I did not see it update. Is there a way to force an update?

    I'm on 2.0.4.7

    Thanks.

  8. #8
    Garrett booster
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    Re: SMEC Fuel Trim logging

    *facepalm* I closed the program then it did the update!

  9. #9
    turbo addict Turbo Mopar Contributor
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    Re: SMEC Fuel Trim logging

    Quote Originally Posted by firehawk618 View Post
    *facepalm* I closed the program then it did the update!
    Hello Neighbor. I live on 88th and another member is 5 minutes away.
    Brent GREAT DEPRESSION RACING 1992 Duster 3.0T The Junkyard - MS II, OEM 10:1 -[I] Old - 11.5@125 22psi $90 [U]Stock[/U] 3.0 Junk Motor - 1 bar MAP [/I] 1994 Spirit 3.0T - 11.5@120 20 psi - Daily :eyebrows: Holset He351 -FT600 - 393whp 457ft/lb @18psi 1994 Spirit 3.0T a670 - He341, stock fuel, BEGI. Wife's into kid's project. 1990 Lebaron Coupe 2.2 TI/II non IC, a413 1990 Spirit 3.0 E.S. 41TE -- 1993 Spirit 3.0 E.S. 41TE -- 1994 Duster 3.0 A543 1981 Starlet KP61 Potential driver -- 1981 Starlet KP61 Parts -- 1983 Starlet KP61 Drag 2005 Durango Hemi Limited -- 1998 Dodge 12v 47re. AFC mods, No plate, Mack plug, Boost elbow -- 2011 Dodge 6.7 G56

  10. #10
    Garrett booster
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    Re: SMEC Fuel Trim logging

    Hello,

    I found this thread describing the same thing I am trying to figure out. I am using MPSCAN on an 89 TSMEC Cal and I cannot find any fuel trims available for the display gauges. My version is 2.0.5.5.
    I did see the TRIMS under the SBEC option but cannot find a way to export it over to SMEC.
    Is there a way to data log the Fuel Trims with a SMEC?

    Thanks

  11. #11
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: SMEC Fuel Trim logging

    Add 13 new "Vertical Bar" gauges and assign them "Cell 0" through "Cell 12"

    These are the autocal cells and will tell you your fuel trims in 6 different vacuum zones and 2 different RPM ranges.

    Cell 12 is your closed throttle or Idle cell and will tell you how far off your fuel trims are at idle.

    The breakpoints are defined in the cal in Fuel-> Adaptive Controls. RPM is DeltaRPMAtRPMBoundariesInRPMOver32 and the map breakpoints are AutoCalMapCellBoundary1 through AutoCalMapCellBoundary5.

    ; *****************************************
    ; Auto Cal Factors Table
    ; *****************************************
    ;
    ; closed throttle = cell 12, otherwise:
    ; $ff
    ; +-----+-----+-----+-----+-----+-----+
    ; | 1 | 3 | 5 | 7 | 9 | 11 |
    ; R1 +-----+-----+-----+-----+-----+-----+
    ; | 0 | 2 | 4 | 6 | 8 | 10 |
    ; rpm^ +-----+-----+-----+-----+-----+-----+
    ; map> MP1 MP2 MP3 MP4 MP5 $ff
    ;
    ; *****************************************

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  12. #12
    Garrett booster
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    Re: SMEC Fuel Trim logging

    Thank you Brian!
    I will get to it asap.
    I am still playing with MPTUNE LOL.
    Jason

  13. #13
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: SMEC Fuel Trim logging

    no problem.

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  14. #14
    Garrett booster
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    Re: SMEC Fuel Trim logging

    Hello
    I set up my layout with the 12 gauges. The 12 gauges are not reading anything. Not sure if I did it right. I added them to an existing layout that worked and created a new profile. The previous gauges are working.
    Any thoughts? Do I have to create the entire profile from scratch?
    Thanks
    Jason


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  15. #15
    Garrett booster
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    Re: SMEC Fuel Trim logging

    Update:
    I did create a new layout and profile and the same thing happened. None of the 13 Cells are reading. Hmm.
    Thanks

  16. #16
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: SMEC Fuel Trim logging

    hmmm not sure. I have only been logging them with mpscilink and mpscandroid. I will have to do a test.

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  17. #17
    Garrett booster
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    Re: SMEC Fuel Trim logging

    Brian,
    I think I got the gauges to work.. Here are what my first five cells are set at: (Did not touch them in the cal under Adaptive Memory)


    Auto cal Map cell boundary 1 = -10.32 psi
    Auto cal Map cell boundary 2 = -8.301 psi
    Auto cal Map cell boundary 3 = -6.053 psi
    Auto cal Map cell boundary 4 = -3.459 psi
    Auto cal Map cell boundary 5 = -0.865 psi


    I do not know the details for the other cells (6 through 11) are. Ex: Delta RPM at RPM Boundaries – 2.0 Out.
    I can't translate the Auto Cal Factors Table LOL
    Thanks,
    Jason

  18. #18
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: SMEC Fuel Trim logging

    i believe the other cells are the same vacuum values, but above the RPM point....

    and i dont think they are 123456, but 02468-10 below the RPM point and 13579-11 above the RPM point.

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

  19. #19
    Garrett booster
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    Re: SMEC Fuel Trim logging

    Hello,

    I finally Datalogged. Of course I am little confused LOL. Here is a link to my numbers in Excel and MPL File:

    https://drive.google.com/drive/folde...usp=drive_link

    Any help with explaining the changes I need to make would be appreciated.

    Thanks

  20. #20
    Boost, it's what's for dinner... Turbo Mopar Staff Aries_Turbo's Avatar
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    Re: SMEC Fuel Trim logging

    looking at the majority auto cal cells, the ecu is pulling ~20 percent fuel to stay around 14.7 at part throttle/vacuum. you could stand to scale for a larger injector size (10% or so) and see if the auto cal cell values drop. you are pretty rich up top so it may get that a little closer but keep an eye on the wideband like a hawk.

    after its not pulling so much fuel in vac, then you can start tuning the pumping efficiency table so that at WOT your air fuel is constant and safe (around 11.5 in boost) across the RPM range.

    Attached is a pic of what the autocal system affects and which cell is targeting which MAP/RPM range. outside of the max high and low MAP and RPM boundaries, there is no fuel correction.

    Click image for larger version. 

Name:	autocal cells.jpg 
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ID:	66402

    Brian

    Quote Originally Posted by turbovanman
    This one is easy, I have myself to blame, I rush things, don't pay attention to gauges when I should, change to much stuff at once then expect miracles, the list is endless.

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