I know in AEM and hondatas K-pro, the system works by running two of the four cylinders like normal operation.
The other two cylinders the fuel is injected, compressed, never ignited, until on the exhaust stroke. but you have to have it incredibly rich. im talking 500% fuel for it to work right and get you 20+ psi.
so pretty much this approach will not work on our gc swaps. my v.6 is a wasted spark and im fairly sure (correct me if im wrong) the ej20k/g is as well.
so this has me at another idea that maybe someone who has more time than me can try.
you can get a direct injector for cheap now, 70-150 bucks off a mazda or something. these handle high temps, perhaps having a switch set in the ecu to hit this would work??? place it in the exhaust, hook up the fuel line T and have at it. I know its not the 1200psi these DI injectors normally run at but it should still spit some fuel in.
who knows, i could just be talking out my ass when i should be working.