mass airflow sensor
They typically aren't programed right.... They will show a different hz to the same airflow rate. They also don't have a screen that keeps the air flowing more evenly into the meter. unless you have at lease 3" of straight pipe before the meter the screen is a definite must have for easy tuning.
They missreport airflow to the pcm to try to lean out the overly rich factory programming. You could spend $300 on a "sensor" that lies to the pcm, or you could spend $125 and tweak the pcm and get the airfuel ratio corrected, the timing optimized, the shift points optimized and a whole lot more. This is all besides the point the Granatelli in particular is wildly unreliable. In my over 10 years on the forums I know of just one credible report of a sustained repeatable 3hp gain with a aftermarket MAF on a car with engine mods. The overwhelming majority of intelligent experience is their missreporting of airflow makes tuning very hard and then they fail completely.
