Hey,
I've just been thinking, most MAP sensor based airflow systems have manfold temperature sensors to compensate for the change in air density throughout the wide temperature range of the compressed intake air.
Most of the alltrac AFM to MAP converstions people seem to be doing these days (SMT6/7, circuit board based ones) dont have any compensation for air temperature short of the pre-intercooler airflow temperature sensor (which most people get rid of when they switch to MAP anyway). When manifold temperatures can swing 50-60 degrees on/off boost you are talking almost 20% difference in air density...?
How is this compensated for? Is it that there is a different pressure at zero degrees vs 80 degrees, and the MAP sensor can detect that? If so, what are the MAT sensors for in cars such as the ST205?
(I'm about to attempt MAP conversion using an old IFT fuel computer by PerfectPower, and i am wondering how i need to go about modifying the signal for temperature.)
Thanks guys,
Elliott
I've just been thinking, most MAP sensor based airflow systems have manfold temperature sensors to compensate for the change in air density throughout the wide temperature range of the compressed intake air.
Most of the alltrac AFM to MAP converstions people seem to be doing these days (SMT6/7, circuit board based ones) dont have any compensation for air temperature short of the pre-intercooler airflow temperature sensor (which most people get rid of when they switch to MAP anyway). When manifold temperatures can swing 50-60 degrees on/off boost you are talking almost 20% difference in air density...?
How is this compensated for? Is it that there is a different pressure at zero degrees vs 80 degrees, and the MAP sensor can detect that? If so, what are the MAT sensors for in cars such as the ST205?
(I'm about to attempt MAP conversion using an old IFT fuel computer by PerfectPower, and i am wondering how i need to go about modifying the signal for temperature.)
Thanks guys,
Elliott