Mazda Speed 6. Manual — part 5
01 ENGINE
22
Waste Gate Regulator Solenoid
An intake manifold connection to the waste gate actuator opens the waste gate. The
waste gate regulator solenoid regulates boost pressure from the intake to bleed off
pressure, preventing the waste gate from opening too early when maximum boost is
needed.
There are three operating modes for the Waste Gate Actuator solenoid:
Solenoid off, waste gate closed, building boost
Solenoid off, waste gate open, releasing boost
Solenoid on, waste gate closed, building maximum boost
1. Solenoid off, waste gate closed, building boost
Cool Fresh Air
High Pressure Hot Air
Exhaust Gasses
1.
2.
3.
Waste Gate is closed
Waste Gate
Solenoid
01 ENGINE
23
2. Solenoid off, waste gate open, releasing boost
When boost pressure is high in the intake, the boost pressure from the intake
manifold acts on the waste gate actuator to open the waste gate, slow down the
turbine, and prevent an over-boost condition.
Cool Fresh Air
High Pressure Hot Air
Exhaust Gasses
01 ENGINE
24
3. Solenoid on, waste gate closed, building maximum boost
The waste gate regulator solenoid tunes the opening rate of the waste gate to help
build maximum boost when needed. The solenoid controls the line from the intake
manifold to the waste gate actuator. When the solenoid is energized, it bleeds off
pressure routed from the intake manifold to the waste gate actuator. The solenoid
bleeds this pressure back into the turbocharger inlet.
Cool Fresh Air
High Pressure Hot Air
Exhaust Gasses
Waste gate is
Closed
Apply pressure is bled
off from the wastegate
actuator back to the
turbocharger inlet
01 ENGINE
25
Air Bypass Valve
The air bypass valve protects the intake manifold air ducts, passages, and sealing
gaskets from damage due to over-boost. Over-boost can occur when accelerating
the vehicle and closing the throttle suddenly. When the throttle closes suddenly and
boost pressure is present in the intake manifold, this valve pops open and vents the
pressure back to the inlet side of the turbocharger.
Air Bypass Valve - Closed (throttle open)
Air Bypass Valve - Open (throttle closed)
Throttle open and
high boost
TURBO
WASTE GATE
SOLENOID
Valve is open
TURBO
Manifold
vacuum
Throttle closed
and high boost
WASTE GATE
SOLENOID
Cool Fresh Air
High Pressure Hot Air
Manifold Vacuum
Cool Dense Air
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