You add more pressure, you have to compensate for more fuel. You remove pressure, you don't have to compensate for as much because you aren't getting as much, which is not the best way to use those big injectors. It helps for fine tuning, if anything, but can't make up for the way the SAFC works.

Not a huge range on what you can do with fuel pressure, anyway. Go down to maybe 32, which is pretty damn low, get a poor spray pattern out of injectors. Go up to maybe 50, but only if you're running 20 psi or less, if you want to keep your fuel pump anywhere near the pressure range it can pump enough fuel out.

 

I just bought a datalogger and I'm getting a gm maft. Think that will be enought? My injectors will probably be 750.

 

eh, I dont care much for the SAFC myself, piggyback computers in general arent all that great, but using the SAFC in a boosted car just doesnt make any sense to me. because from what I understand it only adjust fuel in response to RPM correct? I am using MegaSquirt in the Neon and will be using it in the Talon as well, same cost as a SAFC but much more versatile