Air Fuel Ratio question

[93stang burden]

i am getting a air fuel ratio gauge this weekend. my question is that my tuners have been limiting the air f uel ratio to 12.5/1. by turning up my fuel pressure regulator from 42 psi up to around 48 can i get my air fuel down to around 12/1 or 11.5/1 at full throttle? i am hoping that this will help with my pinging under load.

 

[90stang5speed]

Im not a pro tuner or anything but, I think most N/A cars run 12.5 -12.8 AFR at WOT. You shouldnt need to go to 11.5 unless you are running a boosted car. What is your timing set at? You might want to back if off a couple degrees.