So far my SF reads lower. I have always used the SF formula for my calibration plates. It is DIA x DIA x 13.29 x SQ RT of test pressure. As an example, my 2.500, 450cfm plate, flows 442.8 cfm on my SF. The reason I do this is because the rotating disc in the SF is a nasty hole saw square edge, and not a sharp edge design.I have the Saenz d680 and superflow 750. The superflow 750 reads higher on the intake and slightly lower on exhaust. The saenz gets to 28 inch almost instantly not so with superflow.
An orifice style bench doesn't need temp for correction. An pitot or LFE does. Audie software is built pretty universial. You can also add leakage that would be deducted if you have any.How come the actual and corrected are the same on the first test? never seen that before.