Fuel Trims? Options

[BudmannG]

What Fuel trim do you guys usualy run on your logger? I read some where to try and get them as close to 100% as I could.
Right now my fuel trims are L=139.5 M=127.9 H=134.2

On saturday when I went to Nates, My knock was off the wall 42 was the highest and I think we got it down to 21. Did we do something wrong, or is this right. Not that I don't trust Nates tuning, I just want a second opinion on this. Because I still have knock and my fuel trims are all showing I'm running lean. Unless I'm reading it wrong.

[natedogg]

Your fuel trims are closed loop controlled and dependent on the 02 sensor output. The tuning we were doing was WOT open loop and is independent of the fuel trims. The appropriate feedback for WOT open loop is knock and timing. If you want to bring your trims down you'll want to pay attention to what RPM's you cruise and idle at and adjust accordingly. I tune mostly for WOT, because the ECU takes care of the cruising trims for me. Of course, I'm not as concerned about fuel mileage, whereas you probably are.

Starting from a knock count of 43 and bringing her down to 20 is a good start, but if you want to try richening her up more in your mids you may be able to bring that count down more. If your boost is spiking at all it can bring that count up and then it will slowly come down during the run. Also keep in mind that knock can come from warm air just as well as a lean condition. I'd try richening her up some more and see what happens. Its not always easy for me to tell how it feels vs. what the numbers tell me if I'm not in the driver's seat.