That 51 has to be a random glitch in the data. That is well outside the limit of the BLM adjustment possible in the ECM.Originally Posted by dave w
The trend I do see is overall it is lean.
I datalogged these old ECMs with WinALDL back in the day. I really like the spreadsheet approach to the gathered data and the filtering options that could be toggled through. When I ran 7747 and 299 ecm back 2 decades ago, I datalogged for a 100 mile trip each way nearly every weekend for a whole summer to get things right. I made adjustments after each trip. After 3-4 trips I had it running pretty good. After 15 trips it ran pretty flawlessly. The EBL Classic came out not long after. I got one as a Beta tester before they were released to everyone. The file that RBob ran has 305 LG4 on ran better than the tuning I had been working on out of the box. I will say our engines were almost identical and we both had 350 injectors though. I threw the EBL into it, flashed the base LG4 file, my engine fired right up, started a datalog and threw it right on the highway. Engine ran smooth as silk and managed 19 mpg on that trip running 70-75 mph. Did not realize until later that lean cruise was enabled and because of that got very little in the way of BLM data that run. The EBL code just ran the engine better than the GM code. I noticed the same thing with the later 7427 type PCM as well. They just run better out of the box and the data stream from both gathers much more data in a shorter drive.
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