I was just wondering if it was worth it to buy the after market mass airflow sensor.....any hp gain?
94z28a4

 

No, more than anything else they cause problems.

 

How is that?

 

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.

 

So basically you get more of a gain from tuning the stock MAF than buying an aftermarket one

 

Not the mass air you tune, it is the pcm.