Motiv E30 Rev 2.1 raised boost slightly to be right at 20 and also fixed that dip in boost target around 4-4300RPM. I also increased spool a little
Tuesday April 9th Just replaced boost solenoid. Seems to be running great. No CEL 2906 for almost a week now.
APR IS20 - E30 - JB4 Lower Targets Trying to get rid of boost oscillation by using lower than ECU boost targets. Test.