The tuning tool gives a good description of the Startup frictional airflow correction, but what is Startup airflow correction. I've logged both IAC_SUP_DMA and IAC_FRICTION_DMA during startup. IAC_FRICTION_DMA corelates closely to B4343 but IAC_SUP_DMA bears no relation to B4304. In fact, while logging today I noticed that the PID's for friction and startup airflow were giving identical figures in my logs. Is this how it is supposed to be or is something funny going on?