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Quite the project you have done.     Car is looking good.

I have. There are small superchargers on Junkyard Thunderbirds which are tempting. An electric turbo and an electric supercharger have some differences, but are basically the same. The same battery/regen/motor concept could be used. Blazing trail on that sort of project is more time, money and energy than I have. 

My Audi mindwalk is fun, but I am curious about the questions I posed to start this thread. I am running Aeromotive components (aside from injectors) and asked them similar questions last week, without response. According to the internets a well tuned turbo on a high compression engine should be able to increase engine Torque 20% and increase mpg 3 to 4. I believe this is in addition to any power bump achieved by raising the compression. From the engine specs, raising the compression of a KA24E 1-1.5 points and adding a turbo (max boost 5-7psi) will yield the increase in torque and the increase in mpg.   Please point out the flaws in my reasoning Thank you

Have you ever seen a Paxton super charger? It's like a turbo run off the a crankshaft pulley. Probably not as efficient as you would like but I wonder if it could be rigged with an electric assist. Just a uninformed thought.

I ran into those hurtles. The BEST solution is to use an electric turbo from a new Audi. They are designed to run in pairs on a V8 but a single would be fine for a four banger Nissan. Either they are too new, or other back yard hacks have reached the same conclusion, because the Audi electric turbos are still over 1k used and they are only one piece of the awesome Audi system. A 72v battery pack charged from regenerative braking and/or a generator off the turbo shaft making the battery pack mostly "free" energy. Audi uses an advanced ECU to balance boost and efficiency. I would simplify it (out of necessity, I have no clue how to reprogram an Audi ECU) and use the Audi turbo only at low rpm, like a launch assist. I would like to use it more but =simple steps.  While the above works out on paper, it is more complicated than I want to make my truck and my next project (the LJ20) already has the foundations for a hydraulic launch assist, I continue to hold hydraulic over electric for energy storage applications, until batteries become so fantastic, other methods/modes of storage are no longer practical.   Many years ago, I picked up a hydraulic fan motor and considered creating a "hydraulic turbo" for low rpm operation, run off a high pressure accumulator, charged by a pump attached to an axle or wheel hub and powered by regenerative braking. However, it appears to be a more efficient use of regenerative braking energy to re purpose it directly into powering the wheels for launch assist and not directing it to a turbo, to more efficiently operate an engine, to power a hydraulic pump, to fill an accumulator, to operated a hydraulic motor, which powers the wheels at low rpm creating "launch assist".