I am struggling with a mechanical theory and was hoping for some expert opinions. If someone's intent was to build a 0-320 and turbonormalize it, there are a couple of very expensive "bolt-on" options. But it seems to me, one of the hallmarks of the experimental aircraft is innovation coupled with simplicity and affordability. To wit, a standard of TN systems is this thing called an Absolute Pressure Controller - one of these things that costs somewhere in the neighborhood of $1300:
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They run off of upper deck pressure, and tell the waste-gate what to do by use of oil pressure. The next thing to consider is that aircraft waste-gates are about 4 times the cost of an automotive waste-gate.

I keep trying to understand the fluid dynamics of it, and I just keep coming to the conclusion that you should be able to operate a normalized turbo using manifold pressure to an automotive waste-gate (air pressure), but my mind is telling me that that would operate the waste-gate in the exact reverse of what I'm looking for. Do I have that right? I feel like someone has already tried to make this work. Please discuss...