6395 OE BHDF .. In this tune stock even if closed loop idle was unchecked it still went into closed. I have now changed the appropriate temp parameters that I get closed loop idle and with decent idle ve's the idle is good a little richer than 14.7. Now for the question, there is a flag "open loop afr enable " that is normally unchecked. If that is checked does that activate the tables under "open loop afr tables"? If it does how does the computer do that considering it runs on NBo2. Does it take the action of the NB and do some mathematical wizardry? I could change them one at a time and data log the results but the big block likes fuel so hoping someone knows.