You're O2 operation is junk and you need to track down the injector issue, or find out you don't have one because of the O2. Have you messed with any of the tune at all. If so it would help to start fresh with the original tune (as long as the cam isn't too big) AND change the injector data for what you have installed. Is the truck running in blended mode, or Maf failed or what?
I also don't like the position of the o2's at all. You're not gaining all the cylinders and you're too close to the heads (if they truly are in the manifolds where you mspainted them). This is most likely going to be a problem. Put new O2's in it just for shits and giggles. You want to see them switching. STFT and LTFT should not be zero, especially with it untuned. Make sure they are working, AND you are logging the pids.
Do you have a wideband? If not, you're not going to get this thing truly tuned in without it.
Note that 100% tps runs right now without tuning the VE and the maf is not going to help matters, especially if your trims are not working correctly for any of the reasons above. The time and place for that is when you're filling in cells after you've gotten closer.
Some other things. Your scanner page should be logging IAT etc... Make sure those values are looking correct and make sure it goes closed loop. Get the o2's working correctly by getting it to trim, and make sure the maf values are looking reasonable. If the maf is in question then fail it and run SD and see what it looks like.
Its really all hit or miss without a wideband though, but for now be safe with it.
Thanks for the feedback.
The scanner posted in #34 is with the MAF and o2 sensors unplugged. It also includes the fuel trim being reset.
I have four tunes I could screw around with:
Stock 6.0L with stick
'Light' modified 6.0L with stick (mail ordered tweak for stock cam)
Cam modified 6.0L (mail ordered tweak for new cam using 6.0L injectors)
Cam modified 6.0L #2 ('same' as above except for 8.1L injectors)
None of the tunes have been modified by me. I did look at the 8.1L injector tune and verified that the injector information matched the 8.1L stock engine tune(2004 Silverado 8.1L) I also did a scan on some of the changes in the latest tune and I'm confident that I wasn't provided a 'destructive' tune. The tuner is reputable so I have no reason to doubt his tune is in the ballpark. My expectation was to use the tune as a leap off point to dial in.
The cam is what I would term mild: 208/216 | .561"/.561" | LSA113+4 It is "much" more than the stock ~190/190 cam.
As noted, I added a wideband. But it is reading so lean (~18 afr) that I might as well have not wasted money on it. As noted, it is currently cycling 4.15v to 4.25v. The 4.25v is maxed out for the sensor(18.5afr) The wide band is ~30" from my cross over merge and before the muffler. There is no catalytic to interfere.
I do have the IAT as a pid. From previous runs, it occasionally gets to 115F when I am standing still. Between the two multipliers available, even that 'warm' would only pull 2-3 degree of timing. Before multipliers, maximum retard of 20 degrees starts at 158F IAT. But that would require running at 6k rpm and an engine temp under 68F. My ~210F engine temp cuts that down to 38%.
In post 19, you can see that the o2 sensors are cycling. The fuel trims were working before I did a flash of the 8.1L injector modified tune. From my reading, the fuel trims require a fair amount of driving before they become active. From my reading/watching, the long term fuel trims are more of a mask to an imperfect tune(ie non-road or non-dynod tune) In an ideal tune, there would almost be no long term fuel trims in action.
The manifolds are going to be the manifolds. I have some difficulty seeing a factory setup causing that much of an issue. Maybe I need to track down a vette tune to see how they handle o2 readings. I won't be going to headers. I had a set... they warped to shit. The tight frame rails of this rig limit what I can do.
