When you post a question about tuning to another forum, nobody knows about saving gas. All they know is about making more power. That's the major market for electronic tuning products/services.
I'd like to do some very uncommon adjustments to my 2002 GMC 5.3 V8 and its 4L60E automatic transmission. How can I do this?
I'd like to make it always upshift at a maximum 1500rpm, not downshift even if I go WOT, 3-2-1 positions obey completely, and leave Tow/Haul mode stock (which will give me a single button to press for more normal behavior/fast driving). I'd like to be able to adjust this multiple times through trial-and-error, so it's got to be something I can do myself.
I'd like to make DFCO far more aggressive, coming on immediately anywhere above 1000rpm and staying on until 800rpm.
I asked on the GM truck forum that I frequent, but of course answers will all be about power. I can't really describe my plans there as there's currently a lot of hate for FE discussion (due to people repeatedly asking idiotic questions about it, or just complaining with no question; technical questions get some help but mostly a bunch of bullcrap, kind of like when someone posts here with a big SUV).
In other news, the last 1.1 miles of my commute is coastable except when something forces a stop, such as the construction currently going on. I usually coast in neutral, engine on, then (when in my VW with its manual transmission) EOC the last 80 yards or so where I can see clear to my parking space. Today I did the whole thing EOC and was lucky that there was no obstruction. 1.1 mile EOC FTW!
Actually, I think I got the reply I need from the GM truck forum after all. Blacbear performance can probably do exactly what I need. I think they might just be using EFILive, but at $200 I'm pretty sure I'm looking at 1/3 of what buying my own EFILive stuff would cost.
Now I just have to decide if $200 is likely to pay for itself. I think I can get 5mpg out of it. Now to the arduous task of figuring out how many miles until payoff...stupid math....someday I'll just make a spreadsheet for it...