I have not installed my vortech fmu yet but when I do I am planning on running 5 psi daily and a little more at the track. I have a 12:1 fmu with stock injectors 255 fuel pump. I am wondering if I would be able to tune the fmu if my a/f were to be too rich at lower psi's. I was thinking about running a mechanical boost cotroller in the vacuum line to the fmu. This in my opinion would be a good way to have a controlled orifice which I could adjust with my boost , cutting fuel at lower psi, if need be.
Has anyone ever tried this?
What does everyone else think?