What tables does the ECM use to calculate fuel for different modes?
03-27-2007, 02:45 AM
#1
Staging Lane
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What tables does the ECM use to calculate fuel for different modes? I am trying to figure out which tables the ECM uses for different modes that the car could be in.
Below is what I have so far which I BELIVE to be correct, but I could be wrong. Could someone please fill out the blanks and/or fix the values I have if they are uncorrect. Thanks
CLOSED LOOP/MAF
• NORMAL DRIVING: MAF Tables
• WOT: PE Tables
CLOSED LOOP/NO MAF
• NORMAL DRIVING: VE Table
• WOT: PE Tables
OPEN LOOP/MAF
• NORMAL DRIVING: Open Loop Table
• WOT:
OPEN LOOP/NO MAF
• NORMAL DRIVING: Open Loop Table
• WOT:
Below is what I have so far which I BELIVE to be correct, but I could be wrong. Could someone please fill out the blanks and/or fix the values I have if they are uncorrect. Thanks
CLOSED LOOP/MAF
• NORMAL DRIVING: MAF Tables
• WOT: PE Tables
CLOSED LOOP/NO MAF
• NORMAL DRIVING: VE Table
• WOT: PE Tables
OPEN LOOP/MAF
• NORMAL DRIVING: Open Loop Table
• WOT:
OPEN LOOP/NO MAF
• NORMAL DRIVING: Open Loop Table
• WOT:
03-27-2007, 05:26 AM
#2
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PE tables apply in all instances where the trigger conditions are met.
Same as the other tables. MAF determines airflow for PE calculations when used and SD calc using VE table are used for mafless installs. But thats not the full story as MAF uses a blended value which progressively favours the MAF until 4000rpm when the maf airflow takes over.
Best idea is to grab yourself a tune tool and go and mess about with it. Your answers will come all at once
Same as the other tables. MAF determines airflow for PE calculations when used and SD calc using VE table are used for mafless installs. But thats not the full story as MAF uses a blended value which progressively favours the MAF until 4000rpm when the maf airflow takes over.
Best idea is to grab yourself a tune tool and go and mess about with it. Your answers will come all at once
03-27-2007, 06:39 AM
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Originally Posted by ringram
PE tables apply in all instances where the trigger conditions are met.
Same as the other tables. MAF determines airflow for PE calculations when used and SD calc using VE table are used for mafless installs. But thats not the full story as MAF uses a blended value which progressively favours the MAF until 4000rpm when the maf airflow takes over.
Best idea is to grab yourself a tune tool and go and mess about with it. Your answers will come all at once
Same as the other tables. MAF determines airflow for PE calculations when used and SD calc using VE table are used for mafless installs. But thats not the full story as MAF uses a blended value which progressively favours the MAF until 4000rpm when the maf airflow takes over.
Best idea is to grab yourself a tune tool and go and mess about with it. Your answers will come all at once
What he said. 