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No, No, and No.

Rail Pressure 52psi & Intake manifold pressure 0psi = effective fuel pressure 52psi.

Rail Pressure 52psi & Intake manifold pressure 10psi = effective fuel pressure 42psi.

Rail Pressure 62psi & Intake manifold pressure 10psi = effective fuel pressure 52psi.

Referenced regulator is to keep effective fuel pressure the same in boost, rather than it falling off. If you had more boost than rail pressure, you would inject air into the rails rather than fuel into the manifold. If you have 30psi of boost and 52psi in your rails, your effective pressure would be so low (22psi) that you couldnt get injectors large enough and your fuel atomization would suck.

Referencing the regulator in a 370z isnt usually needed until 10psi of boost or more. Unless your injectors are too small, then you might do it sooner.

Referencing a regulator in a 370z should be done to a boost only source (charge pipe), and not a boost/vacuum source like other cars. This is due to inconsistent manifold vacuum from the VVEL system.

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