I am in the process of calculating the drive ratio that I need to run my Eaton M90 on my limited coupe.
1. I calculated te motor requires 350 CFM @ 100 % VE
2. I want to run 8psi max
3. Looking at the inlet flow on the graph, spinning the sc 8000 rpm should deliver 350cfm @ about 10 psi, so I would need to run somewhere around 7500 rpm?

Am I way off or what? It looks like the ratio needs to be very precise. Anyone have experience with this?