L3 Turbo Engine
Air Charging System
• A wastegate type turbocharger supplied by Hitachi has been adopted for the air charging
pressure system, which utilizes exhaust gas pressure to pressurize the intake air and
forcefully blow the air to the cylinder. Thereby power efficiency, driveability, and fuel
economy have been improved.
Turbocharger Construction/Operation
• The turbocharger consists of the turbine wheel, compressor wheel, wastegate valve, and
wastegate actuator.
• When exhaust gas flows to the turbocharger turbine wheel, the coaxial compressor
wheel rotates and intake air is pressurized.
• The wastegate actuator opens the wastegate valve according to the overpressure at the
diaphragm.
• When the wastegate is open, the exhaust gas pressure at the turbine is lowered, and
this lowers the speed and force of the turbine, which results in decreased intake air
pressure.
M6-MPS_01027
1 To charge air cooler 4 From exhaust manifold
2 Intake air side 5 To WU-TWC
3 Exhaust gas side 6 From air cleaner
01-26 Service Training Mazda6 MPS Supplement
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