I ran my old Z WITH a TT fuel pump for 2 or 3 months running 15 to 20 psi. Long story short, I damaged the motor cause I'm an idiot. Got to the dyno and found out I was running over 17:1 A/F between 3500 and 4200 RPM's for about 3 months. You've spent way too much money and come way to far to justify not spending a couple hundreds more bucks for a good tune. Don't make the same mistake i did!