Has any thought been given to enabling mixed-mode tuning between TPS and MAP bins? Or is this something that's possible already that I've not found on the site? From what I gather, MJ is a one-or-the-other proposition. Could it be implemented to make the most of both?
I'm already in-process of implementing EDIS-8 on another project which will be controlled by a MegaSquirt II, and that project absolutely requires MAP tuning due to forced induction. I intend to leave my carbureted toy exactly that--carbureted--because I can't see spending the dyno time and money on A/F ratio tuning for something used so infrequently. The real power is in the spark advance, so doing a "spark map only" tune seems a worthwhile effort.
MAP is obviously the better route in terms actual required spark advance, but the engine in question is a bit gnarly: It's a Chrysler 340 V8, 10.5:1 compression, with Glidden-era W2 Pro Stock heads, and a 278°/286° duration, .621"/.621" lift solid-roller camshaft. Induction is a ported Holley single-plane intake with an 850CFM Demon double-pump carb. I honestly don't think this thing could idle below maybe 1,100RPM with a distributor. An extremely noisy, weak vacuum signal @ idle is a given, so I'm thinking straight MAP-based tuning is out. I doubt the engine will make more than 100% VE at full throttle, but then again, you could almost chuck a cat from the plenum to the cylinder at full lift without hitting anything. My cam grinder suggested a 4,000RPM track launch and shifting between 7,500-7,800RPM. I'm guessing he gave idle quality not a moment's thought.
The car, a 1969 Plymouth Valiant, will be primarily street-driven so I'd like to get its street manners as civil as possible.