Plugged exhaust ? please look at log

[metalmanimal]

Recently built 5.3 swap in a 07 sierra Gen3 DBW with TSP stage 1 cam and valve springs. trying to figure out why it has absolutely no power and wont even break the tires loose. TM removed and runs the same, back to stock even worse. I noticed that my KPA readings go to 100KPA under heavy load which I dont think is normal for a NA motor. Thought maybe a cam tooth off but thats good. Now wondering about if the exhaust possibly plugged or restricted. blew the tires off it when it the 4.8 in it with the same exhaust hard to believe an extra.5 liter slowing it down. Running out of ideas any help would be very appreciated.

[dhoagland]

One thing I notice is that your are not commanded any Power Enrichment, even at 85% throttle your commanding 14.xx. I'm not familiar with this OS, but I'm thinking the table: Engine>Fuel>Power Enrichment> Throttle> Hot select Needs changed. It is set to 285. The way I read this is the engine must be at 285 to enter PE (maybe I'm backwards). Your wideband is showing AFR 15 so you are lean. I would get this figured out first

[5FDP]

Yep, it's going lean under heavy throttle.

Brake torque mngt in the systems tab is still on, that could prevent you doing a burnout.

[TheMechanic]

Pull the O2 sensors and start it. You can hear the exhaust pulse will be very noticeable with a plugged exhaust. I have an exhuast pressure tester I use that screws into the existing O2 bung. Works great. Should be able to get a cheap Chinese throw away that will help

[metalmanimal]

On my old 0411 DBC truck I could light the tires easily even with brake torque management on but the P59 DBW is a whole different animal I guess. I have several licensed 0411 PCMs and considering re pining it for DBC but worried it will light up my message center like a Christmas tree. loosened the muffler flange bolts and drove it around the block and it only made more noise no power. 150lbs compression cam is only 208/214 .550/.550 lift cam.

[dhoagland]

Pull the O2 sensors and start it. You can hear the exhaust pulse will be very noticeable with a plugged exhaust. I have an exhuast pressure tester I use that screws into the existing O2 bung. Works great. Should be able to get a cheap Chinese throw away that will help

What kind of back pressure is normal? Is it PSI or Inches of Water?

[metalmanimal]

Think I found my problem. Trying to VE log this whole time with dynamic air RPM disable set to 100 instead of 10000 RPM. Kind of hard to run right and get any accurate data that way.