You are correct, the Voltage is a non linear representation of airflow. I know nissan uses VQ maps to convert the MAF voltage to a percentage of flow. Here is a very good explanation of it: http://www.sr20forum.com/showthread.php?s=&threadid=25488
A progresive controller is your friend.
Copied pasted from http://www.sr20forum.com/showthread.php?t=59689
"...NX conservatively states that a typical stock 4 cylinder engine can handle a straight 75 shot with no problems. At 3000 rpms the torque added would be 75hp*5252rpm/3000rpm =...