This is what I have come up with so far.
The GT40 looks like the replacement for the TO4.
It is about the same size. It meets Dave Leonard's
suggestion for using a large turbo loafing along.

We start with the airflow requirements of the rotary at 15 psi boost.
That should give us around 400 HP with side intake ports and a VE of
around 100% (no intake valves). My guess is that would be about 480 HP
with p-ports that have a higher VE. At sea level of course.

The airflow for a side port rotary is about 35 pounds per minute.
In the  compressor chart that puts us near the middle of the 78%
efficiency island using the larger diameter 88 mm compressor option.

That's good as it will load down the turbine a bit and tend to
keep the turbo charger RPM down. I choose the 1.34 A/R in the
turbine chart for the same reasons. More about A/R shortly.

If we limit the boost to about 9 psi boost for cruising (flat rating)
we should still be on the island.

What do you think Dave Leonard?

Paul Lamar ...No rotor no motor.

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