Turbocharger Boost Pressure

Allow engine to cool. Disconnect actuator hose and attach a vacuum gauge. Warm engine to normal operating temperature. Increase engine speed to 4000 RPM. Check that boost pressure is at .28 psi (.02 kg/cm² ) on 626 and .7 (.05 kg/cm² ) on RX7.

Fig 1: Exploded View of RX7 Turbocharging System

Courtesy of MAZDA MOTORS CORP.