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F F R R O O M M A A I I R R F F I I L L T T E E R R
F F R R O O M M A A I I R R F F I I L L T T E E R R
L L O O W W P P R R E E S S S S U U R R E E
L L O O W W P P R R E E S S S S U U R R E E
C C O O M M P P R R E E S S S S O O R R
C C O O M M P P R R E E S S S S O O R R
H H O O U U S S I I N N G G
H H O O U U S S I I N N G G
L L O O W W P P R R E E S S S S U U R R E E
L L O O W W P P R R E E S S S S U U R R E E
T T U U R R B B I I N N E E
T T U U R R B B I I N N E E
H H O O U U S S I I N N G G
H H O O U U S S I I N N G G
E E X X H H A A U U S S T T O O U U T T L L E E T T
E E X X H H A A U U S S T T O O U U T T L L E E T T
Two-Stage Regulated
Turbocharger
• The dual turbocharger consists of
two turbochargers in series. The
high pressure turbocharger is the
smaller unit and is configured to
provide boost at low speeds and
loads. The low pressure turbo is the
larger
turbocharger
configured to provide boost at
higher speeds and loads.
Exhaust Flow
• Exhaust flow from the cylinders
enters the turbine housing of the
high-pressure turbocharger and
causes the high-pressure turbine
and compressor wheel to spin.
Exhaust then exits the high-
pressure turbo and enters the low-
pressure turbine housing, causing
the
low-pressure
turbine
compressor to spin.
Intake Flow
• Fresh airflow starts at the inlet of
the
low-pressure
housing, flows from the low-
pressure compressor to the high-
pressure compressor inlet and then
exits directly to the charge air
cooler piping.
Operation
and
is
• During operation, the high pressure
turbo provides most of the boost at
low speeds and light loads. as
speed and load increases the low
pressure turbo begins to provide
the increased airflow.
• Under certain conditions the ECM
can modify the air flow through the
turbocharger by commanding the
boost control solenoid (BCS)
closed. When the BCS is closed,
and
boost pressure builds in the
pneumatic actuator, and when
boost is sufficient, the actuator will
International
AIR MANAGEMENT SYSTEM
P P N N E E U U M M A A T T I I C C
P P N N E E U U M M A A T T I I C C
A A C C T T U U A A T T O O R R
A A C C T T U U A A T T O O R R
H H I I G G H H P P R R E E S S S S U U R R E E
H H I I G G H H P P R R E E S S S S U U R R E E
T T U U R R B B I I N N E E H H O O U U S S I I N N G G
T T U U R R B B I I N N E E H H O O U U S S I I N N G G
H H I I G G H H P P R R E E S S S S U U R R E E T T U U R R B B I I N N E E
H H I I G G H H P P R R E E S S S S U U R R E E T T U U R R B B I I N N E E
open the bypass valve and divert
some of the excess gas flow
compressor
directly to the low pressure turbine.
• The high pressure turbocharger
results in improved response and
higher low speed boost capability
providing improved low speed
engine torque. The compounding
capability of the two turbos in the
mid range results in increased
power, fuel efficiency and the ability
to maintain power
altitudes. The larger compressor is
capable of providing the airflow
requirement without sacrificing the
efficiency of the engine.
®
VT 275 V6 Engine
T T O O C C A A C C
T T O O C C A A C C
H H I I G G H H P P R R E E S S S S U U R R E E
H H I I G G H H P P R R E E S S S S U U R R E E
C C O O M M P P R R E E S S S S O O R R H H O O U U S S I I N N G G
C C O O M M P P R R E E S S S S O O R R H H O O U U S S I I N N G G
E E X X H H A A U U S S T T I I N N L L E E T T T T O O
E E X X H H A A U U S S T T I I N N L L E E T T T T O O
at higher
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