The wideband is a great tool for any boosted application. It has shown that open loop is triggered by more than just a high throttle angle via the TPS. I can climb a high elevation pass at 25% throttle and yet as the boost climbs past about 8 psi the airflow alone through the MAF will trigger open loop. It's great, the ECU is far smarter than what I could have programmed into a standalone EFI.

Jeff--if it's pinging at 3 psi you might check the gap on the sparkplugs. I wonder if the gap is too loose and causing spark blowout under boost.

Keep it rich man, don't ever let it see that much boost without a 12.5:1 or richer A/F.