phunk

The discrepancy I believe you are missing is that a MAF sensor is not "boost-smart". Once you are using the MAF sensor in a blow-through application, while you will maintain repeat-ability in the installed application (hence still allowing for a consistent and safe tune), there is no longer any direct correlation between MAF voltage and PPM of air. You are now tuning based on literally just MAF voltage VS RPM, rather than a known quantity of air vs RPM. Without outside data collection such as boost gauges and logging, while tuning the UpRev, we would be entirely blind as to have any idea how much air mass is entering the engine.

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