LOWnEASY

iTrader: (1)

iv been chasing my tail on this one. cant for the life of me figure out whats going on.

its a 08 5.3 with headers 222/222 cam and d1sc procharger with 3.55 pulley, has bosch 650cc injectors and walbro 450 every time I get up to around 9 psi the truck starts cutting out and the wide band goes crazy when it starts cutting out but from what I can tell in the log its pretty close before it stats its shenanigans.
I was thing maybe the gas was running to the back of the tank where the pump couldn't pick it up so I filled it up and same story, tried a power brake, no luck.

I think I'm running ngk br8 plugs, cant really recall. one thing I didn't do is gap them, just remembered I didn't do that. could I be blowing the spark out at 9 lbs?

here is a tune and log

03sierraslt

iTrader: (22)

What are the plugs gapped at? Those are pretty cold plugs for 9psi, have you pulled them to see how they are burning? I am on my phone so can't see the logs.

I know you said you didn't gap them so I would check a couple and see.

terravast4

iTrader: (25)

i would put try in tr6 in there and see what happens

LOWnEASY

iTrader: (1)

The ultimate goal is 17 lbs. I just can't get past ~4500 rpm to get there.

Atomic

iTrader: (42)

Sounds like ignition issue for sure without seeing the logs. Check for burned wires and cracked plugs? I would start with the gap around 0.028" and tighten from there as needed.

03sierraslt

iTrader: (22)

I concur with this. I would gap them there also.

GMCtrk

iTrader: (27)

I don't think br8 plugs have the proper resistors

Try 7s at 0.025

LOWnEASY

iTrader: (1)

Just gapped them to .28 and looked they are ngk tr6. Havent got to try it out yet.
My old set up I ran br7s so I thought I got br8s

03sierraslt

iTrader: (22)

What was the gap? TR6's aren't as sensitive on gap as 7's and 8's. 6's in the .032 range should work fine. I still suggest reading the plugs to see if the heat range is correct.

LOWnEASY

iTrader: (1)

The plugs looked almost new really, had a slight (very slight) Brown tint to them. They were nearly .040