Well, I have a Procharger on a 5.4 single cab 2wd F-150 and I don't think it is performing like it should. My best 0-60 is 6.8 and my best quarter is 15.14 @ 94 mph measured by a G-tech. The truck won't spin so that isn't a factor in the times. The engine doesn't pull very hard from 4200 rpm up. I have NGK Iridium spark plugs and I know the belt isn't slipping. My boost guage reads right at 10 psi at 5000 rpm. Anyway, what kind of performance should I have? Any suggestions?

 

The engine should be kickin *** in the higher rpm. I recall an ATI owner having the same problem. It turned out one of the fuel lines to/from the inline pump had too tight of a bend in it and was causing fuel flow issues.

Try changing the fuel filter too.

What fuel pressure are you seeing at 10psi? I'm around a 100psi.

 

I checked all the fuel lines and none are kinked. I believe I had the fmu set too low. I completely closed it and it pulls harder now above 4000 rpm than it did. I will try to check the performance later today and see if it improved.

 

I went and tried it out. The truck is probably running as good it is going to now. It pulls alot better above 4000 rpm and I ran it once and the 0-60 is now at 6.4. That's better, thanks for the help.