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Originally Posted by Fastbird
Unless........
Should I even be concerned with what fuel trim cell it's operating in and worry more so about the overall MAP vs. RPM scope??? Arent' the fuel trim (BLM) cells just used for a "history" or learn of sorts???
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Dont' concern yourself with the BLM cell, that'll just give you a good overall idea of where the tune needs work. Example, in cell 1 you might be idle for 90% of the dataloging. So look at where the car idles (which rpm and map) and adjust the cells accordingly.
As for split BLMs, you need to ignore the huge splits although it would be interesting if you noticed the splits in only one condition like deceleration or high load acceleration. In general though just use the datalog, run it through excel and get an average. How many miles are on your engine? You could have deposits on the injector pintels that are causing the split BLMs, this isn't uncommon for older port injection. The newer delphi injectors are a lot better at resisting deposits! A pressure leak down test will tell you know about the injectors and everything about the fuel pump, so don't even bother with that kind of a test. Just grab the LS1 injectors for $100 brand new take-offs, it's cheaper than cleaning your used injectors
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If you need any help tuning let me know. I've been known to dable with these kinds of things from time to time
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__________________
, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue
