Wow, it still pulled vacuum at wide open throttle? That's um that's horrible.
And here I thought I could get away with a modestly sized (that means small by MFR standards) p-port. Well screw that. I'll go for MFR sized or close to it, and at least the high res code.
What I know about MegaSquirt is on the classic CPU and the 2.2 board on my 20B. Totally stock unopened high mileage about ready to break a couple apex seals due to seal slop early pre-letter code engine. It could idle and accelerate well up to 5k where the smallish stock ports start to become a bottleneck and my lack of tuning and a small exhaust made themselves apparent. I had it control ignition so I didn't have to run a distributor. It was a steep learning curve but I bet I could get one to control a 4 rotor p-port and have it idle acceptibly. Any thoughts for injector size and type? I have several FC NA engines I could harvest for rotors and injectors. Two 460 injectors per rotor has a nice ring to it.