I'll start with the HPT files that are always requested, although this is more of a 'question' thread than a 'problem' thread. My thanks to the people who have posted "how-to's" -- I used @Rinkrat456 's "Idle Tuning Guide" to start out with, and I think I've done well (so far).
EditFile_WorkingTune_2003_Sierra1500HD_QS.hpt
Test_Drive_after_SparkSmoothing_11-1-20.hpl
Misfires_and_Fuel_Trims.Layout.xml
(note: My channel config when I took this *did* have the fuel trim channels, so the data was / is (?) still in the logfile.)
I've also been reviewing the forum history, and finding a lot of info there -- maybe too much? So I'm at the point where I think I need to check in and ask a question or two, based on what I've seen / read.
The truck:
2003 Sierra 1500HD (Crew Cab) -- 2WD, 5800lb. LQ4, 4L80e, Dana 60 w/ 4.10 (it's a Quadrasteer truck, and yes, the QS works)
Rated at 12K; I'm towing about 7-8000 for now. Strong runner, even before I modified it. It's a dedicated tow, not a DD.
Have put a lot of mechanical TLC into it over the two years I've had it, and love the thing to death. (was towing with a 5.3L Envoy, previously)
Recently added a Comp Tow Cam (54-452-11), with the following specs:
212 / 216 duration, .052 / .052 lift; 115 LSA.
Calculated overlap is -16 (the stocker was -15.75)
Given the specs of a stock LQ4 cam, you can see that it's a pretty mild grind, and I know that made it easier to dial it in.
Along with the cam, I put fresh 317 heads in (stock height, no porting) with an all-new valvetrain, new oil pump, timing chain, replaced all sensors / gaskets, etc. Basically a top-end rebuild / freshening.
Bottom end is stock (but AFAIK is in great shape).
I had the truck down for awhile while I did the above, and the check valve in my fuel pump went bad, so I'm in the middle of replacing that. Got a Walbro E85-capable 450lph pump; eventually, I plan on adding the fuel composition sensor and being able to run E85. I like to travel west, and at elevation, they actually lower octane out there. At about 8mpg, I like to run the cheapest fuel I can get (while I'm willing to run mid-grade if absolutely recommended, I will *not* run 93).
My Knock Retard #s look good for now, IMHO. I did notice there was one point in the log where it pulled a bunch of timing out (it looks like after a gear shift occurred, and the truck was at about 4000rpm before the shift). Granted, I don't have a lot of seat time yet, as I'm doing the fuel pump, currently.
My STFT and LTFT looked really good, IMO (you may not see them in the logfile). My question revolves around Stoich - right now, 14.7 is commanded, and the reading I've done states that I'd probably want to richen that up a bit. I've also read that I shouldn't touch fueling without a wideband.
So... based on what's in my files... what are my next steps? Do I get the WB and start working with that? Or is that overkill for my application, which is towing @ 65mph max, and being able to get up the mountains at that same speed, when possible? IOW, WOT is not something you'll see me at often.
I worry that 14.7 is too lean (or will be, once I hook up the trailer and head up the mountains).
No, I haven't enabled PE, or disabled torque mgmt yet -- those things will come. I'll probably set up PE to kick in about 3000-3500 RPM.
Future plans include a TBSS intake w/ E85-capable injectors, something along the lines of a Airaid MIT tube, electric fans, and if I find I need it down the line -- a mild turbo setup (but that would be at least a year away, as I've not towed since putting the cam in). I want to pull like a Duramax, without getting a DMax (at my age, I don't have the time / patience to 'learn diesel').
I'll stop here and wait for any questions. Thanks for reading, if you got this far.