The disparity between the flow bench readings and the MAF Sensor conversion table, MLHFM, was larger than I was expecting to see even accounting for the rough calculation from kg/hr to CFM.
I checked the 5v output from the ATX power supply and observed that it was providing 5.138v, a good amount more than I would have liked given the sensitivity of the MAF sensor. I decided that I would try using a dedicated 5v power converter to provide the MAF sensor with its 5v supply. I had previously checked this other power supply, and due to the ability to tweak the output voltage I had been able to get 5.005v from the device.
Based on these results it’s starting to look like I’ll need to tweak the power supply to get the bench readings in-line with the stock predicted values, and then I can move on to checking an 85mm housing.