Paul,
In my research, I found this patent on a Rensis rotary that has been
modified for higher torque @ lower rpm than is usual for a Rensis.
Although it is for a marine engine, information is power.  The patent
link is below. I hope that this can help some one in the group.

John F.

http://www.google.com/patents?id=fWOSAAAAEBAJ&printsec=abstract&zoom=4&dq=System+and+method+for+customizing+a+rotary+engine+for+marine+vessel+propulsion#PPA12,M1

It's just an application. I would be surprised if the US patent
office granted a patent on a turbo charged RX8 engine adapted
to a boat engine :) It's the Government so I won't be that surprised.
All turbo chargers increase the torque.

Paul Lamar