ok so will start this thread with what I have so far
mafs are usually rated in kg/h so to convert some used on jtd from kg/h to mg/I
http://www.alfaowner.com/Forum/atta...ilo-jtd-16v-maf-kg-h-to-mg-inj-conversion.xls
from this you can see what the max readable airflow would be at set revs.
now the jtdm 150hp uses the 640kg/h sensor so you can see at the upper end say 5000 revs the max airflow it can read is 1066mg/I now that is no problem but eventually at the upper edge of tuning envelope this is no longer high enough to see the real airflow(which engine is breathing but maf not sensing so not fueling for?)
here is a comparison 640kg/h to 850kg/h mafs with air temp and some afr max fuelling calculations
http://www.alfaowner.com/Forum/atta...-4-maf-limits-and-max-mm3-inj-afr.xlsx-640maf
http://www.alfaowner.com/Forum/atta...16v-stilo-jtdm-644-maf-boost-max-iq-chart.xls
heres air consumption
http://www.alfaowner.com/Forum/atta...720-stilo-jtd-16v-1.9-jtd-air-consumption.xls
heres air consumption converted to velocity
http://www.alfaowner.com/Forum/atta...ir-consumption-and-velocity-70mm-maf-and-80mm
heres colour coded to usable range ,borderline and out of range
http://www.alfaowner.com/Forum/atta...ir-consumption-and-velocity-70mm-maf-and-80mm
there is nothing to be gained performance wise going to larger maf until well over 200hp id say.
will post pics up after
mafs are usually rated in kg/h so to convert some used on jtd from kg/h to mg/I
http://www.alfaowner.com/Forum/atta...ilo-jtd-16v-maf-kg-h-to-mg-inj-conversion.xls
from this you can see what the max readable airflow would be at set revs.
now the jtdm 150hp uses the 640kg/h sensor so you can see at the upper end say 5000 revs the max airflow it can read is 1066mg/I now that is no problem but eventually at the upper edge of tuning envelope this is no longer high enough to see the real airflow(which engine is breathing but maf not sensing so not fueling for?)
here is a comparison 640kg/h to 850kg/h mafs with air temp and some afr max fuelling calculations
http://www.alfaowner.com/Forum/atta...-4-maf-limits-and-max-mm3-inj-afr.xlsx-640maf
http://www.alfaowner.com/Forum/atta...16v-stilo-jtdm-644-maf-boost-max-iq-chart.xls
heres air consumption
http://www.alfaowner.com/Forum/atta...720-stilo-jtd-16v-1.9-jtd-air-consumption.xls
heres air consumption converted to velocity
http://www.alfaowner.com/Forum/atta...ir-consumption-and-velocity-70mm-maf-and-80mm
heres colour coded to usable range ,borderline and out of range
http://www.alfaowner.com/Forum/atta...ir-consumption-and-velocity-70mm-maf-and-80mm
there is nothing to be gained performance wise going to larger maf until well over 200hp id say.
will post pics up after