I have an LSX455 with a MagnaCharger in my 1998 C5 with 1999 PCM. Right now I'm using an EFILive custom OS with extended tables for high MAP values (i.e. no fuel trims available in this tune).

What I was thinking about was using a different OS that maintains the fuel trim functionality and then "program" the LC1 wideband O2's to present a voltage to the PCM at AFR 12.5 that is equivalent to stock O2 voltage at 14.63 (stoich) ... thus try to use the LC1's & the Fuel Trims to maintain 12.5 AFR instead of 14.63 (as opposed to trying to achieve this with strictly a speed density tune).

Has anyone tried this? What was your experience? Any problems or did it work well for you? Did you maintain a more consistent AFR vs. speed density?

Thanks,
Bobby