Alright guys, here goes nothing.
I have been wrenching and tuning my Truck for the better part of a year and i think i have hit a roadblock with my tuning. Everything was going great, the normal learning process for a new venture. Had the tuning going towards being pretty dialed in but was running out of injector up top so decided to upgrade it to be safe. Here is the tune file prior to fuel upgrade:
Final Tuned File 2.6.20.hpt
Upgraded to a walbro 450, return style with boost regulated fpr and deka 80lb injectors from vsracing:fi114991
After piecing together the how to's on how to get the bigger injectors going in the e38 system i just cant seem to get the tune to start dialing in. Realized while logging today that my commanded AFR is staying constant until PE kicks in instead of scaling with airflow. I've tried changing a few parameters to affect a change but without any luck leading me to believe i have overlooked or missed something in my injector tuning which is causing it to behave funny. Ive looked into and thought of the transient tables but my tables seem very different than anything i can find information on. Any help or guidance would be greatly appreciated, I have been researching and racking my brain for a while now and can't seem to get it figured out. Below is my current working tune and a scan log showing what I'm talking about:
VE Tune Part 2 run 29 stoich blend.hpt20-02-19 19-44-30.hpl
With the commanded AFR staying constant seems like it will not be possible to tune the tables with any sort of real world curve and the setup will either be commanding lean or rich so ive scaled it to the rich side for now to be safe
My Setup :
2007.5 GMC Sierra
E38 ecm with 2Bar OS
6.0
243 heads
rebuilt bottom end with Stock internals other than upgraded pistons/rings
Comp 1.7 rockers
ls7 lifters
cam specs:
Lift: 0.560"/0.560"
Duration @ 0.050": 216?/220?
Advertised Duration: 285?/292?
Lobe Separation: 114?
TSP .660 dual valve springs
Twin GT35 turbos making 10lbs of boost
walbro 450
boost regulated fpr
deka 80lb injectors
Truck was flex fuel stock and also an in between year for trucks so e38/gen 4 platform but a mix of early and late tuning parameters making it seem as though its sort of a one off. Not a whole lot of similar setups so I've pieced together the info and tuning knowledge I have.
Any help with this is greatly appreciated!