So as I was driving to work today, I got to thinking how much easier it would be if I could force the ECU into open loop when I'm under boost, as it would ignore the O2 sensor and I could just tune for boost zones. Then I remembered the ECU I'm using has the ability to output a 0-5(12?)v signal at a certain boost value. So, is this possible without triggering a CEL? I know some of you on these forums understand the way this stuff works a lot better than I do. I was thinking of maybe tricking the ECU into thinking the TPS is at 100, which is doable, however that would probably make part throttle boost awful as the ECU would be applying fuel/timing tables that are only supposed to be used at WOT, at part throttle. But other than that I really don't know.