Yes, I had an adjustable FPR. My car runs incredibly rich all the time. When I lean out during the boost, that is my injectors pushing their limit. It does not matter on the fuel pump, because once an injector's duty cycle is maxed out...it can NOT squeeze out any more fuel. I do not know off hand honestly, but check out the specs on the z31 injectors. They are TINY. Even honda's get larger injectors...I'll race him this weekend with the same variables, fuel pump has not gotten installed and will not for a while.