Thread: MAF Upgrade?

Originally Posted by Scottydoggs

when you out flow the limits of the maf sensor. to do so you need a turbo, or cam ic heads, aka lots of mods done to out flow the stock maf.

In even simpler terms, you're going past the highest values on the MAF table in your PCM, which is maxed out at 11,500 hz in the sensor output and 511g/sec in the table. An AFC can be used to skew down the Hz value from the sensor (or a larger diameter MAF tube). If you're getting near or above 511 g/sec, you'll need to skew your injector flow rate down to avoid hitting that value.

I've dealt with both of these issues, either with 20+psi turbo settings, M90 pulleys in the 2.55-2.70" range, and my MP112 setup. I've been doing both the AFC and Injector skew for a while, to avoid approaching either again.