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Thread: Open Loop BLM?????

  1. #1
    Fuel Injected! ralmo94's Avatar
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    Open Loop BLM?????

    So for some reason, after getting spark curve issues inline, when tuning ve table open loop, I get BLM? Anybody ever have that before?

    I did a quick search and I couldn't find anything.

    I'm tuning in $OD on a 94 GMC 5.7. I have a wideband installed to EGR channel to the 7427 equivalent (6395)

    closed loop enable temp is maxed, and data log shows open loop.

    BLM update min RPM maxed out.

    I don't understand why BLM's are updating in open loop?

    I went ahead and burned another chip with min BLM max BLM both to 128 and changed BLM step from 1 to 0.

    Tune log entries

    07/12/2020 20:38:36 Scalar: Minimum BLM changed from 105 BLM (0x69) to 128 BLM (0x80).
    07/12/2020 20:38:49 Scalar: Minimum BLM at Idle changed from 90 BLM (0x5A) to 128 BLM (0x80).
    07/12/2020 20:38:56 Scalar: BLM Step Value changed from 1 BLM (0x01) to 0 BLM (0x00).
    07/12/2020 20:39:06 Scalar: Maximum BLM changed from 165 BLM (0xA5) to 128 BLM (0x80).
    07/12/2020 20:39:14 Scalar: Maximum Initial BLM changed from 135 BLM (0x87) to 128 BLM (0x80).
    07/12/2020 20:39:24 Scalar: Minimum Initial BLM changed from 126 BLM (0x7E) to 128 BLM (0x80).



    I will disconect the battery to clear BLM and try tuning VE again.

    Maybe I don't understand, but I was under the impression that all qualifiers had to be met to trim fuel, Closed loop enable, INT, max RPM, TEMP. Does someone know how the code logic works? Does it look for 1 before the other?

    I have no idea. Weirdest thing to me to have open loop BLM's while INT's stay locked at 128

    I thought with a Wide Band this thing would be easy to tune. I still think if it would do what I'm trying to tell it to do, it would be.
    Attached Files Attached Files
    Last edited by ralmo94; 07-13-2020 at 07:13 AM. Reason: added log

  2. #2
    Fuel Injected! ralmo94's Avatar
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    i hope it was ok to post my bin here. I just read a thread stating that it's not cool to post modified bins on a public thread. I always thought if you had something weird going on you were suppost to post your bin, so if anyone interested in helping could see what you did that might be wrong. If I have broke the rules, I sincerely apologize. I never intended anyone to try to run a bin I posted that might have issues

  3. #3
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    It's OK to post your .bin for the sake of diagnosis.

    I'm unsure why your BLM numbers are changing. They should remain at 128. I may not have time to look at your files today. Are you seeing changes in the actual BLM or the BLM Cell#?

  4. #4
    Fuel Injected! ralmo94's Avatar
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    It's actual blm. I when I looked at wide band in the same areas blm was under 128, wide band was lean. Above 128, wide band was rich. I no longer have a narrow band on the truck. Any narrow band reading is from simulation from wide band. Thanks

  5. #5
    LT1 specialist steveo's Avatar
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    the BLM (long term trim) values can change in open loop, if you have stored trims in a cell, and you're changing cells.

    that doesn't mean they're updating (if your INT is 128, they really can't be)

  6. #6
    Fuel Injected! ralmo94's Avatar
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    Quote Originally Posted by steveo View Post
    the BLM (long term trim) values can change in open loop, if you have stored trims in a cell, and you're changing cells.

    that doesn't mean they're updating (if your INT is 128, they really can't be)
    That's what I thought also! Truck has only had open loop tune since last battery disconnect, and a long long time before that. If you look at the data log, it shows deviation range. I understand that trim cells don't exactly correspond to VE cells, but it shouldn't have any BLM, as I have not seen it go closed loop, and have not ran a closed loop chip. Disconnected the battery this morning, don't have a new data log as my laptop was dead.

  7. #7
    LT1 specialist steveo's Avatar
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    i've never used $0D but pretty sure $0D actually stores them in eeprom or something so removing battery power will not work. there should be some blm keep-alive settings in the bin you can modify to control the range of values that are stored. you can probably clear them via the datastream, doesnt your ADX have something for that?

  8. #8
    Super Moderator dave w's Avatar
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    The simulated narrow band O2 information from the WBO2 can be problematic.

    I use both the WBO2 data and the factory narrow band O2 sensor connected to the computer when I tune. I tune in closed loop. Usually open loop (choke, warm up, PE and AE) will show BLM's at 128.

    I've noticed a tendency for WBO2 data and the factory narrow band O2 data to conflict with each other. The WBO2 data is more accurate.

    dave w

    Near Idle.jpg

    Off Idle.jpg

    PE Active.jpg

    BLM - Near Idle.jpg

    BLM - Off Idle.jpg

  9. #9
    Fuel Injected! ralmo94's Avatar
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    I don't think I have any commands I can do while data stream is active. Or else I don't know how. Straight forward on hp tuners. But I paid a lot for HP tuners. Do you have to add anything to get commands?

  10. #10
    Fuel Injected! ralmo94's Avatar
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    Quote Originally Posted by dave w View Post
    The simulated narrow band O2 information from the WBO2 can be problematic.

    I use both the WBO2 data and the factory narrow band O2 sensor connected to the computer when I tune. I tune in closed loop. Usually open loop (choke, warm up, PE and AE) will show BLM's at 128.

    I've noticed a tendency for WBO2 data and the factory narrow band O2 data to conflict with each other. The WBO2 data is more accurate.

    dave w

    Near Idle.jpg

    Off Idle.jpg

    PE Active.jpg

    BLM - Near Idle.jpg

    BLM - Off Idle.jpg
    I agree. I don't want to use closed loop at all. I only have one bung in the pipe.

  11. #11
    Super Moderator dave w's Avatar
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    Quote Originally Posted by ralmo94 View Post
    I agree. I don't want to use closed loop at all. I only have one bung in the pipe.
    I wonder what a data log with the attached .adx would look like? The reason I wonder is because data captured with the attached .adx will align the exported .csv with the WBO2 spreadsheet posted here: http://www.gearhead-efi.com/Fuel-Inj...g)-Spreadsheet

    Changing the filter from closed loop to open loop will show the open loop information.

    dave w
    Attached Files Attached Files

  12. #12
    Fuel Injected! ralmo94's Avatar
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    Quote Originally Posted by dave w View Post
    I wonder what a data log with the attached .adx would look like? The reason I wonder is because data captured with the attached .adx will align the exported .csv with the WBO2 spreadsheet posted here: http://www.gearhead-efi.com/Fuel-Inj...g)-Spreadsheet

    Changing the filter from closed loop to open loop will show the open loop information.

    dave w
    That looks like the adx I started with. I changed a couple of things in it so I could get a histogram of wide band in lambda, and changed my spark, as I am 2deg at dizzy.

    I just realized you posted the xdf. Looks like what I use. Isn't it the same one as I posted at the beginning of thread?

  13. #13
    Super Moderator dave w's Avatar
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    Quote Originally Posted by ralmo94 View Post
    That looks like the adx I started with. I changed a couple of things in it so I could get a histogram of wide band in lambda, and changed my spark, as I am 2deg at dizzy.

    I just realized you posted the xdf. Looks like what I use. Isn't it the same one as I posted at the beginning of thread?
    Ooops

    dave w
    Attached Files Attached Files

  14. #14
    Fuel Injected! ralmo94's Avatar
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    I guess what I have is version 251 and you have version 250. What are the differences if any? Everything I know about TBI tunerpro, and tuning I have read what others have been kind enough to post. All assistance is greatly appreciated, and humbly read.

  15. #15
    Super Moderator dave w's Avatar
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    The 250 file in post #13 is a .adx file for data logging.

    The 251 is a .xdf file for editing the .bin file file.

    The gearhead-efi link for $OD information: http://www.gearhead-efi.com/Fuel-Inj...Information-0D

    From 1project2many:
    Corrected Advanced $0D TP5 v251 Low Async Short BPW Offset vs. BPW table to correctly use Async Short BPW Offset Bias. New version uploaded as Advanced $0D TP5 v251.xdf .

    dave w

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