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bwilson4web,
I thought I would inform you that your turbine maps are actually compressor maps. Finding good turbine maps is like finding hens teeth.
A turbine's power output also depends on the square root of the gas temperature (in Kelvin) flowing into it. So wrap your boiler section with insulation tape and warm the water in your water tank with an engine coolant loop.
Keep in mind that turbos spin very very fast. This is going to give you trouble mechanically and electrically. The turbine and compressor wheels are balanced as a unit operating one by itself or just separating the two is enough to warrant rebalancing if you expect a long service life. Keeping a home made rotor together is going to be a challenge. Balancing it is going to be even tougher. On the electrical side the inductive reactance of the coils will work against you at some point. This will progressively limit your output at higher rpms.
Your "oversized" turbine might be better suited to this project to keep the rpms down
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