Show me the contrary proof that ram air can give positive pressure

As I said in an earlier post:
Depending on scoop inlet area, as soon as the vehicle sees a specific velocity that creates a flow volume greater than the engines need at its specific RPM you will, from that point and accelerating further, have a positive pressure situation.

This theory you have with those graphs are for clean flow situations like air passing over an aircrafts wing. They have no bearing here.
Now for the above:
Lets take an engine with an air consumption rate of 1000cfm.
Now the vehicle has a scoop with an inlet area of 30in^ or .21ft^
We know Q=VA, where Q is volume fluid flow in this case in CFM.
V= the vehicle velocity.
A= the area of the scoop.
Simple algebra V=Q/A
1000/.21=4761.9 FT/Min or 54.1MPH
At that velocity and above pressure will start to increase. More air entering than the engine normally consumes so the unused air compresses and builds pressure within the scoop. How much is hard to calculate as there are turbulence issues in the scoop. We actually had a scoop on the Comp car that created enough reversion above the carb that it sucked fuel out of the vent tubes at a certain speed. Took a while to figure that one out. I am now out on this subject.