DrX
May 22nd, 2015, 05:58 AM
Why would these differ if they are both calculated based on the VE table? (Speed density tune)
GM.DYNAIR - GM's estimated airflow in grams per second based on the VE table. This value is calculated independantly of the MAF. It is used to test MAF rationality and when the PCM is in speed density mode (i.e. MAF removed or disabled).
GM.DYNCYLAIR - GM's estimated airflow in grams per cylinder based on the GM.DYNAIR value.
GM.DYNCYLAIR_DMA - internal (DMA) PID that is used by the PCM as an index to look up various tables that are indexed on grams/second(??). This values is derived from the MAP, RPM, IAT and VE tables and is independant of the MAF.
GM.DYNAIR - GM's estimated airflow in grams per second based on the VE table. This value is calculated independantly of the MAF. It is used to test MAF rationality and when the PCM is in speed density mode (i.e. MAF removed or disabled).
GM.DYNCYLAIR - GM's estimated airflow in grams per cylinder based on the GM.DYNAIR value.
GM.DYNCYLAIR_DMA - internal (DMA) PID that is used by the PCM as an index to look up various tables that are indexed on grams/second(??). This values is derived from the MAP, RPM, IAT and VE tables and is independant of the MAF.