Speed density uses manifold absolute pressure and an ambient air temp sensor and calculates the density of the air along with throttle position...and gives that value to the computer for fuel and ignition timing/delivery.

Mass air takes a direct value of the incoming air charge and the most common method is the hot wire a wire is set inside the MAF and put into the airflow the wire is then energized..the more air that flows through..the colder the wire gets...and resistance of electricity is directly proportional to the wires temp so the computer knows how much air is flowing based ont he resistance of the wire.

Not so common is the flapper door where the more air that goes through pushes open a flap.

Mitsu..karman vortex in the dsm...some kind of techno voodoo shit that measures the vortices produced by incoming air...black magic.

 

Ok got it. Thanks for the explanation. I already knew how MAF worked but I didnt know how speed density worked and I had never heard of the vortex thing youre right it does sound like black magic.

 

speed density also useds manifold pressure to sense the engine load

 

speed density sucks for turboes
stick with your MAF you wont spend 99.9999999% of your time tuning your ride and you car wont run good one day and then run like ass the next

 

I siad that manno....thats why we have map sensors..manifold absolute pressure.

 

oh shit i am the suck

i totally didnt see that my bad


for the record

sds is speed density and it pwns you