MAP is for measuring engine load, not input air!

 

MAF: This implies that the sensor is Directly reading both the DENSITY and the VELOCITY of the air and interpolating the pressure.

MAP: This sensor reads ONLY the pressure, the computer uses this information in conjunction with the engine RPM, and then interpolates the flow by calculating the density.

 

MAF does not measure density directly. It also needs the IAT to do that. And, like I said earlier, MAP can be used in speed density mode, but when there's a MAF, the MAP is used to determine engine load by comparing the pressure in the intake to the amount of air coming into the engine (measured by the MAF and IAT).

 

alright better answer.. but does the map adjust for the difference when the air is released rather than recirc?

 

That's what could possibly be different in these cars, and I would like to know that, too. Because I've always learned that it's the O2 sensors that will compensate for bad MAF data.

 

well only thing i can say after putting custom cone intake on and the bov that the car runs exactly the same.. i feel no difference at all, just the fact that i can hear the turbo spooling up a lot better and the bov sound.

ps: budlight golden wheat is good stuff