Like the title states, I'm looking to go back to pump gas after running E85 for the past couple years. Main reason being that E85 isn't the easiest to find in my area and I drive a long stretch of highway (about 360 miles) that doesn't have any stations. The truck is a 6.2 with a Borg S475. My initial tune (blackbear autocal) worked for the past few years but I'm at the point that I'd like to fiddle around with the tune myself rather than waiting months to hear back from Blackbear. Back when he tuned it, he mentioned that I'd have to run E85 at boost levels greater than 10#. I'm at 12# now but recently turned it down to 9# after noticing my fuel pressure dropping to ~30# above 4500 rpms (still on stock flexfuel pump). I'd like to switch the tune up to a pump gas tune but I'm a little lost as to how to go about it.
For the experienced folks out there, should I tune strictly for pump gas or should I take advantage of the flex tables and tune based on ethanol content? I don't have an actual sensor, just the stock flex fuel virtual sensor. I've been watching goatrope's vids as he seems to have a good grasp of GM engine tuning, but he moves so quickly I find myself getting lost trying to follow his logic.
Thanks for any help you all may be able to provide.
2010 6.2 Silverado
Borg S475 @ 9#
850cc injectors (rated at 43#, so closer to 1000cc @ 58#)
Stock flex pump and returnless system
Current tune: Rev. 9-FFDP from forum enabled upshift adapt.hpt