Help with 6.o Tune in 1500 Silverado

[Kris.]

Hello all, I am hoping someone can read my tune and log and give me some ideas on performance and fuel mileage. The engine is a rebuilt 6.0 bored .20, with a Comp Cam part #32227133. Intake 222 Exhaust 227 lobe separation 113. Deleted cats. Everything else is stock. Truck is a crew cab Z71, it's not a race truck obviously, but I was wanting something better than stock on performance. The tune is an email order from a tune shop, I personally know very little about tuning. Questions to those smarter than me, does anything in this tune stand out as incorrect or needing some additional tweaking. I've never been impressed with the build from day one, and wonder if it's just a minor change needed. Also my fuel mileage has dropped from 16ish to 12 recently, it's never been that bad and I hope I can get it fixed. Thank you.

[5FDP]

Check for vacuum leaks and check your fuel pressure. I know it's a cammed engine but your fuel trims are maxing out lean most of the time so that's a pretty big issue. Seeing +25% is pretty bad will be a cause for the fuel mileage drop.

I will also say this, you don't have big enough injectors for this engine either. You need larger injectors once you get into full throttle tuning and you'll need a wideband oxygen sensor for tuning.

If you have zero vacuum leaks, zero exhaust leaks around the front o2 sensors and your fuel pressure is good, then this thing needs a ton of work to the airflow model to get it corrected. The MAF curve and the VE table need a ton of work.

Also you have a knock sensor code you need to fix, that is always going to pull timing on you if that code is present.

[GHuggins]

Knock sensor code will cause it to pull all of the timing out when going into PE. Will make it feel like a slug. Doesn't look like VE was dialed in anywhere other than "maybe" idle area, so do as suggested above and figure out those two items and she'll be a new truck.

[Kris.]

Checked for vacuum leak, I couldn't find one, but I found a small exhaust leak and cleared the knock sensor code. It is running better, but I think the tune could still be better. I'll move on to the wide band next. Thx

[Kris.]

This is the post repair log.

[Kris.]

Also, what injectors do you recommend?

[Jakeallred]

i have had great luck with deatschwerks !

[SiriusC1024]

If you don't want to pay out the ass there's higher flow GM options. Open the attached at post #39:

https://forum.hptuners.com/showthrea...ata+repository

[Lxjoshxl]

i put 60lb detschwerks in my truck they are nice injector duty way down from stock lol 35U-01-0060-8 is the item number