rrfpr fmu am i right ???????????????????????????????????????

[e30turboed]

if my fpr runs 43.5 psi fuel pressure and i use a 10:1 fmu rrfpr in conjuction with original fpr does that mean the fmu wont take effect until i get to 4.35 psi of boost ? then 50 psi for 5 psi boost, 60 psi for 6 psi boost and so on ? if anyone can just clarify or tell me im wrong

thanks