Megasquirt Options For Turbo 318

I have an MS2 (MS1 chipped) and it should handle just about anything I can throw at it. You got 40lb injectors? You are good on size as 28 lb are good for ~300 HP. My MS2 upgrade chip was $20 bucks and my MS1 kit was $100. bank or batch/semi seq (1 or 2-4 ch) is plenty, Sequential is only sequential until about 2800 RPM then it becomes "batch" as its squirting at a closed valve, just like batch. And you need a cam position sensor to run Sequential, and thats sloppy through the chain. Semi (bank) and batch dont need a CamP/S. Sequential is more for emissions. Hell, F1 fogs their intakes from about 12 inches away! Im doing up a 273 with the same logs and spec turbo you got but will be blowing through a marine AFB. Rock on!
Free Self tuning? I think the Tunerstudio with the $50 upgrade opens the self tuner option, check it out first. And their whole "open source" has become quite narrow. That pushed me toward my $150 DIYEFi.org Jaguar 0.6 board. Now that is totally open source but you are expected to pretty much tinker with it and report back on the forum as to what works and what doesnt (and deal with a rather dry Euro admin) It will run as designed about on par with an MS3 but without data logging or bluetooth, also has way more limited trigger options.