Something is off.
you should be making more than 4 llbs, your track time of 12.3 is proof you are making more power than 4lbs would warrant.
The 43lb injectors are good to about 450hp without meth.

 

TWO 340s...

 

Do you know what the fuel pressure is? You could have a clogged fuel filter and you are not getting the correct fuel pressure to the fuel rails.

 

Dual intank setup with a hobbs switch

 

two Bosch 420L pumps and some 96lbrs

 

That works to haha

 

for real?

 

Check the fuel pressure as well, be sure it's more than 50psi at wot and top of gear. Since yours is an 01, you probably have just one inline pump and your stock intank pump. Maybe your stock intank pump can't keep up and is a little weak. With the times in your sig and the boost level, the addition of an intank should be enough. I know it'll support around 580hp to the wheels.

If the a/f ratio is still lean and the fuel pressure is good, check the tune.


good luck,
allen

 

Y??? Not enough???

 

With one intank 255 I made 581 uncorrected to the wheels on a stingy AWD dyno. I was running a 30%E85 mix, with no meth. One 255 set up right in the tank, with meth should be good for 600+RWHP on an efficient setup, and trap well over 120MPH in a 2wd truck. Sounds like you are making decent power for only 4psi. What size is the engine?