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I'm not entirely sure you understood what I'm saying... I will try to clarify.
I will agree that backpressure is generally considered to be a bad thing, so when I mention it, you realize that you will have a slight amount of backpressure that is caused by the turbine housing. It's unavoidable, because the turbine housing requires a pressure differential to convert the heat energy in the exhaust into flow energy that can be captured as work. Higher backpressure will mean a larger amount of drag on the engine itself, even a perfectly stock engine.
As for your mentioning regulators, that's all good what you mentioned, but you also realize that if the alternator is called upon to provide more amperage, it has to take more work from whatever's moving it. That isn't noticed while the alternator is mechanically powered by the engine, because the alternator is simply a small parasitic load that could be essentially ignored. However, in the case where the alternator is powered by something like your turbine, where that's the only thing it's moving, then you have to have some mechanism in place to keep the turbine spinning. Otherwise, you'll find that your turbine will stop altogether at a certain alternator loading.
I am, of course, assuming that you're going to use some sort of wastegated solution or variable nozzle solution to limit your turbine speed. I still don't think you need to spin as fast as what is mentioned here.
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