BLM main, vs BLM fine in SAUJP v5
12-08-2016, 06:33 PM
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Car: BMW 735
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BLM main, vs BLM fine in SAUJP v5
Can anyone tell me the difference between these values? BLM main says it's pig rich (100-110), wideband shows 14-15, BLM fine and INT run 127-130.
12-14-2016, 11:45 AM
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Re: BLM main, vs BLM fine in SAUJP v5
It not from S_AUJP V5 but is part of the standard $8D data.
It is a sub part of the BLM main.
Fine is just an indicator of change needed, similar to the Integrator response.
There is a setup on one of my dashboards that shows all of the BLM gauges referencing each other so you can see the reaction of them all at once. (JP Experiment 2) is the dash name.
Remember the BLM reacts to where the O2 thresholds are setup to follow, not what the wideband is reading.
If WB is correct, adjust the O2 tables to obtain following at desired values to maintain your WB reading.
It is a sub part of the BLM main.
Fine is just an indicator of change needed, similar to the Integrator response.
There is a setup on one of my dashboards that shows all of the BLM gauges referencing each other so you can see the reaction of them all at once. (JP Experiment 2) is the dash name.
Remember the BLM reacts to where the O2 thresholds are setup to follow, not what the wideband is reading.
If WB is correct, adjust the O2 tables to obtain following at desired values to maintain your WB reading.
12-15-2016, 08:20 AM
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Car: BMW 735
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Re: BLM main, vs BLM fine in SAUJP v5
Thanks for the help on this. Would I be correct in thinking that the BLM main is a time based average of BLM fine? The fine seems to have a much greater refresh rate. I don't understand what you said about the O2 tables and WB readings. I'm hesitant to do anything like that, as my WB and NB are not on the same bank. It takes many sample counts,( at least a running sample count of 1000 or greater) but the BLM main and WB do agree after a while. Again, thanks for your help and wisdom.
12-15-2016, 09:19 PM
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Re: BLM main, vs BLM fine in SAUJP v5
Thanks for the help on this. Would I be correct in thinking that the BLM main is a time based average of BLM fine? The fine seems to have a much greater refresh rate. I don't understand what you said about the O2 tables and WB readings. I'm hesitant to do anything like that, as my WB and NB are not on the same bank. It takes many sample counts,( at least a running sample count of 1000 or greater) but the BLM main and WB do agree after a while. Again, thanks for your help and wisdom.
The short answer: For VE tuning, use BLM (Main). This is the true BLM. Ignore "Fine" as it's incorrectly described.
The long answer: The correct description for "BLM (Fine)" based on code usage should be: "Rough BPW Correction". The variable reported is L00E8, which in CL is the "INT +/- o2 proportional gain counts from the Calibration Table at 0x4DE" ('+' if FAST o2 voltage is going-Lean; '-' if going-Rich). Immediately after the “Rough” correction, BPW is again corrected, but in the opposite direction by ˝ of the prop gain counts. This is the “Fine” BPW correction which somewhat compensates for the Rough, but is not presently reported because this calculated "Fine correction" is not stored in a variable. Note, corrections are to BPW and not BLM.
Regarding update frequencies: If the INT deviates from 128 by more than 5 counts, the BLM is updated 2 counts, but only once per second. The Rough and Fine BPW corrections occur 80 times a second.
HTH.
12-16-2016, 12:23 PM
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Car: BMW 735
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Re: BLM main, vs BLM fine in SAUJP v5
Elaborating on what JP86SS said --
The short answer: For VE tuning, use BLM (Main). This is the true BLM. Ignore "Fine" as it's incorrectly described.
The long answer: The correct description for "BLM (Fine)" based on code usage should be: "Rough BPW Correction". The variable reported is L00E8, which in CL is the "INT +/- o2 proportional gain counts from the Calibration Table at 0x4DE" ('+' if FAST o2 voltage is going-Lean; '-' if going-Rich). Immediately after the “Rough” correction, BPW is again corrected, but in the opposite direction by ˝ of the prop gain counts. This is the “Fine” BPW correction which somewhat compensates for the Rough, but is not presently reported because this calculated "Fine correction" is not stored in a variable. Note, corrections are to BPW and not BLM.
Regarding update frequencies: If the INT deviates from 128 by more than 5 counts, the BLM is updated 2 counts, but only once per second. The Rough and Fine BPW corrections occur 80 times a second.
HTH.
The short answer: For VE tuning, use BLM (Main). This is the true BLM. Ignore "Fine" as it's incorrectly described.
The long answer: The correct description for "BLM (Fine)" based on code usage should be: "Rough BPW Correction". The variable reported is L00E8, which in CL is the "INT +/- o2 proportional gain counts from the Calibration Table at 0x4DE" ('+' if FAST o2 voltage is going-Lean; '-' if going-Rich). Immediately after the “Rough” correction, BPW is again corrected, but in the opposite direction by ˝ of the prop gain counts. This is the “Fine” BPW correction which somewhat compensates for the Rough, but is not presently reported because this calculated "Fine correction" is not stored in a variable. Note, corrections are to BPW and not BLM.
Regarding update frequencies: If the INT deviates from 128 by more than 5 counts, the BLM is updated 2 counts, but only once per second. The Rough and Fine BPW corrections occur 80 times a second.
HTH.