Im assuming you have the FPCM turned up to 11? Did you upgrade the wiring? The 450 on its own should be good for 700ish on pump gas.

 

How do you turn up the fpcm?

But you did make me dig around in the fuel tab and in the tune under fuel system>general> fpcm filed it is set to no....

 

Just looked at your tune file and it doesnt look like your truck is equipped with one. I thought all of the GMT900s were, strange. Basically in the fuel tab you want to max out the duty cycle and desired pressures.

 

It may still equipped with one, the guy that owned the truck before me done some "tuning" on the truck and i don't think he knew what he was doing (PE was set to 1.0 across the board). Thanks for the heads up though

 

Well if you gonna run 15psi then you need to explore a colder plug than a 6

 

From the looks of my logs, by the time I reach 7k rpm (my goal) il be some were north of 19 lbs. So I ordered some ngk b8efs