Unable to hit commanded load

Discussion in 'VersaTune' started by Enki, Aug 7, 2019.

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  1. Enki

    Enki Motorhead Platinum Member

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    @steve@versatune
    I really hate to bug you directly and publicly like this, but I've been trying to figure this out for months and even @mituc hasn't been able to help me figure it out.

    2009 (08.5) MS3 big turbo, stock fueling.

    Currently commanding 2.0 load in the low bat by gear tables from 3k to 5k RPM (2.5 or 3.0 literally everywhere else) tapering off. I'm hitting full boost by 4k, but only hitting 1.8 load (1.9 peak) and it's pulling WGDC. In order to hit my WGDC targets and/or load targets, I'm having to add between 0.15 and 0.2 load across the board and it's proving to be super annoying to get dialed in, as the number seems to increase with more requested load.

    Oh, and I have IDC and boost limits well above what I'm actually hitting, and boost compensation is wholly disabled.

    Is there some hidden checkbox somewhere I need to flip to get this to work properly? If I had any hair I'd already have pulled it all out by now.

    If needed, I'll pull a new log with a new map, but I've sent a few to Mituc already and can just forward those to you if you want.

    Thanks!
     
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  2. Enki

    Enki Motorhead Platinum Member

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  3. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    JohnnyTightlips, via a mobile device, Aug 10, 2019
    #3
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  4. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    I added a post to the Versatune forum but @steve@versatune I believe I am also seeing this issue.
     
  5. steve@versatune

    steve@versatune Approved Vendor

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    Does MAP correlate to Load? I'm wondering if it's a reported load issue, not an actual load issue.
     
  6. steve@versatune

    steve@versatune Approved Vendor

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    Both of you are gen one platforms?
     
  7. Enki

    Enki Motorhead Platinum Member

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    09 for me. I'll get fresh logs and a map and PM it to you later today.
     
  8. steve@versatune

    steve@versatune Approved Vendor

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    please send them to steve @ versatune . net
     
  9. Enki

    Enki Motorhead Platinum Member

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    Will do.
     
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  10. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    My issue as of now has been resolved. It seemed like I was hitting some sort of load safety stuff even though it was set higher then I was actually seeing on the logs. I ended up bumping them to 3 and then I no longer saw strange afr's like the car was trying to adjust based on some limit I was hitting but not seeing. I changed the below tables and it worked so I left it. Eventually I plan to go back through and bring them down but I still have other limits in place so I am not super worried. Right now tuning is at a hault as I am out of fuel and it is too cold to do anything decent.

    Load Limit Force Spark
    Operating Load Limit 1
    Operating Load Limit 2
    Overload Protection Fuel Cut
    APP Requested Load Normal Extended
    APP Requested Load Overload Extended
     
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  11. Enki

    Enki Motorhead Platinum Member

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    Logs and tune sent.
     
  12. Enki

    Enki Motorhead Platinum Member

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    Update: Tested suggestion, it did not work. Since it didn't work (and had slightly negative effect) I won't be posting what was suggested, to keep people from dicking around with the tables involved.
     
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  13. Enki

    Enki Motorhead Platinum Member

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    Minor update:

    Tried another thing yesterday, but no dice. Work's been kicking my ass so I've been slower to test things for Steve (I drive maybe twice a week or so).

    Pending next test instructions.
     
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  14. Enki

    Enki Motorhead Platinum Member

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    Almost month 9, still not fixed.
     
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  15. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    BOOOOO , sorry man , what a mess. MazdaEdit time?
     
  16. Enki

    Enki Motorhead Platinum Member

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    I've heard that's a nightmare in and of itself.

    I finally broke down and did the math (note that this is as of yet untested); I'd attach the spreadsheet but it's not an allowed extension.

    upload_2020-4-27_11-44-54.png

    Formula is as follows:
    New Target Load = Target Load / (100 / (Target Load / Logged Load)) / 100
    Scale = Target Load / Logged Load

    Edit: For any numbers way outside of bounds (pre spool, etc) just use the target load value to avoid potential explodey issues.

    Edit 2: Fixed math. Sorry!
     
    Last edited: Apr 27, 2020
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  17. Enki

    Enki Motorhead Platinum Member

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    Fucked up on the math; post updated.
     
  18. Enki

    Enki Motorhead Platinum Member

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    First pull on first flash with new load values:

    upload_2020-4-27_14-25-11.png

    Compared to old map with straight up targets:
    upload_2020-4-27_14-26-42.png

    I didn't adjust *ANYTHING* else (tune wise, only changed the load by gears tables) so the initial load overrun (caused by high WGDC targets) is probably holding the curve down a bit further than normal; this might even out with successive pulls, but so far looks promising as a workaround until this is ultimately fixed.

    Now that it's warmer out, I'm likely running into temp issues top of the curve (128 deg @ 1.5 load vs 146 deg @ 1.65 load).
     
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  19. Eroler1

    Eroler1 NPC Greenie Member

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    PS: Im not bashing on my wonderful tuner @Atvfreek . just a little bit of butthurt on my side since cant see the full potential of my setup with VT
     
    Last edited: Jun 4, 2020
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  20. JohnnyTightlips

    JohnnyTightlips Platinum Member

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    Hmmm, makes me less excited to start tuning mine for power on VT although I am not going for crazy power "5862"so maybe it will be ok and it is free to self tune so I got that going, really wish AP was not charging for their tuning software just adds even more to the cost.
     
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