Thanks Dave. Starting to make sense. But what happens when the NBO2/BLM doesn't agree with what the WBO2 is saying? I'll explain with an example. I took my last data log and copied the BLM (off idle) and WBO2 output tables from TP into a spreadsheet. I then normalized both: BLM I divided by 128, WBO2 I divided by 14.7. Then I combined those ratio values into a single table so I could easily see where they differ. In the attached, the first number is the BLM ratio, second number is WB. It actually looks better than I thought it was going to, but there are still a number of cells where one is slightly lean and the other slightly rich. If I tune based on one of the values, won't it make the other one worse? BLM vs WBO2.jpg
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