Travis, thanks for your concern (I'm being sincere). You sent me a text yesterday morning, and I'm sorry I didn't reply right away. As you know, I had major surgery recently, so I have not been working, but recuperating instead (there is also an announcement on my support forums about this). I had some good days last week, and thought I was near normal again, but found out I overdid it, so I'm back doing basically nothing (supposedly "rest" helps a body? LOL!).
Unfortunately, as much as all us tuners would love to, we can't go by "word of mouth" for vehicle data. We need full datalogging files to go on. Furthermore, it gets complicated when we're dealing with budget widebands that are inaccurate, which yours showed to be on my dyno (up to a half point). Also, one can absolutely not trust a "budget" wideband at idle, especially a vehicle with aftermarket cams, and then the inaccuracy of the wideband exacerbates the issue (more on that in a moment).
You also had charging system issues, and major fuel delivery issues when you came to my dyno (potentially the fuel was boiling). There was also the issue with your pre-TB inlet tube, due to the flow angle causing an odd ramp-in effect into the MAF, allowing for the pcm to generate false Load readings, which affects any parameter that uses Load (just about everything). Your cams are also not degreed in, only "dotted", and you told me that one of them was 4 or 6 degrees out when you measured them, so this complicates matters, as well. After being on the dyno for 15 hours straight (I still can't believe how cool your wife was being, haha), we were at a standstill with the truck. You were going to work on rectifying the issues, and then bring it back once done, so we could finish dialing it in, and also get a race tune made up. Didn't you recently find trash in an injector(s), too?
In regards to the OL and CL debate, I never recommend anyone go full time OL, but only in extreme situations. Having STFTs (short term fuel trims) at idle and part throttle tells us volumes about an engine. It can tell if the cams are timed correctly (
), if the distribution of the manifold/injectors/etc are good, etc, etc, etc. CL tuning just naturally gives you much more data for idle and part throttle tuning. And, yes, factory O2 sensors are WAY better for idle and part throttle tuning than any "budget" wideband could ever be. The OL choice was strictly yours, and I complied, just as you said you wanted your 3rd gear to "snap my spine when it shifts", so I did that for you, as well, and warned you it could potentially destroy the transmission (you said it was a "hot rod",
).
Anyway, it's all good, you know I will work to take care of you, buddy.
To everyone, the only accurate budget wideband is the NGK AFX (and it is most accurate with the optional NTK sensor), which is nothing more than an AFM-1600 with a modified display. It is within 0.1 tenths accuracy at all times. All others are WAY off, especially as exhaust temps and vehicle voltage change. You can see this info here:
Wideband Accuracy: Facts & Issues - HP Tuners Bulletin Board
If you are planning on purchasing a wideband in the future, or replacing your current one, let this be the one! All the others just can NOT be trusted.
