I've been reading around looking for data on how to interpret manifold vacuum. Why? Well, my original thought was that 0.0hg meant that there was no restriction in the intake system and would mean you're getting the most potential. I soon found that this is not the case. Since there has to be a pressure difference in order for air to move, 0.0hg would mean no air is moving.
If vacuum is reading 20hg with closed throttle meaning it has massive restriction, and 0.0hg at WOT means no air is moving, what would the optimal reading be? Is 0.1 better than 1.0 or vice versa? What are the variables for determining optimal vacuum at WOT?
I have only found data from carb'd setups in which vacuum has different meanings. I'm specifically looking for fuel injection MPI and GDi setups.
Please correct any of my assumptions/statements as necessary.