Maf Transfer

see also: How and why to build a maf transfer

Definition: It is the function that allows the processor to determine how much air mass is entering the engine based on a voltage signal from the MAF meter.

Platform: ALL MAF based vehicles

X Value: A/D Counts or Voltage

Min: 0 A/D or 0 volts

Max: 1023 A/D or 4.9999 volts

Y Value: Air mass in Kg/hr or lbs/tic

Min: 0

Max: Limited to the electronics of the meter

Description: The meter compensates for temperature and density changes in the air mass. For a given air mass the voltage signal will vary for varying temperature and density. In turn the computer can compensate for these variances. Load can also be calculated based on the MAF function and Engine Displacement. (Actual airflow/Theoretical aiflow). Logically, the MAF function is probably also linked with the data from the MAP sensor.

Hints:Tuning Importance: This is one of the functions to tune if you are having driveability problems or have switched to an aftermarket meter and/or larger injectors. The MAF function has been one of the most talked about functions in regards to tuning. It plays an integral part in a vehicle's performance and driveability because this is how the computer knows what quantity of air is actually entering the engine. It is very important that the function be accurate. So what can be done from a tuning standpoint. Well, if you have a Pro-m meter that is calibrated for certain injectors you can enhance performance by entering the correct MAF function for that specific meter. This is done by taking the 9 pt. flow sheet that comes with the meterand inputing it into a special excel spreadsheet that will convert it to a 30 pt flow curve. These 30 voltage and airflow values can then be put in place of the stock values in the software. From there you can fine tune problem points. If the car is running rich at idle, you can attempt to lean it out by multiplying the airflow values at idle by a decimal number less than one. For example, 23.4462 kg/hr X 0.9 = 21.1016. Entering this new value will cause the computer to think that there is less air entering at a given voltage and initially determine that less fuel needs to be injected. However, the O2 sensors will have the final say in what occurs. Multiplying the y values by numbers greater than one will enrichen. Even if you have a stock meter, it can still be tweaked in the same way. The eec-tuner basically takes the place of an air optimizer but with an infinite adjustment range.
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You need to get the maf transfer to within +/- 3% in closed loop so the adaptive control wont correct it in open loop mode
Also, look at your fuel tables. What should it be reading at WOT?