Turbochargers function by utilising the otherwise wasted exhaust gases to produce a compressed air "boost" back into the combustion chamber via the intake. A rotary engine has an extremely hot exhaust flow which contains a large amount of thermal and kinetic energy - perfect for driving the turbine within a turbocharger.
Mazda did a very good job specifying the turbocharger systems on their OEM RX-7 models, however there is always room for improvement as mechanical and technological advances improve the parts and sub-systems to enable better efficiency, reduce turbo 'lag' and increased horsepower.
At RotaryMotion we have extensive experience in modifying and increasing the performance and reliability of turbocharged and supercharged rotary engines. We also supply and fit turbocharged or supercharged conversion kits for the RX-8 and normally aspirated rotary models.