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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 I I N N L L E E T T
C C O O M M P P R R E E S S S S O O R R I I N N L L E E T T
I I N N T T A A K K E E M M A A N N I I F F O O L L D D
I I N N T T A A K K E E M M A A N N I I F F O O L L D D
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 O O U U T T L L E E T T
T T U U R R B B I I N N E E O O U U T T L L E E T T
System Operation
• The VT 275 uses a regulated two-
stage turbocharger to boost the
volume of air flowing into the
cylinders. The system consists of
two turbochargers with exhaust
flow through the units controlled by
the turbocharger boost control
solenoid. The smaller of the two
turbochargers is identified as the
high-pressure turbocharger and is
sized to provide boost for low to
medium
speeds.
The
turbocharger is the low-pressure
turbo and is sized to work in tandem
with the high-pressure unit to
provide the boost and air flow
needed for high-speed, high-load
engine conditions.
• Air passes through the air filter
element and the mass air flow
sensor to enter the compressor of
the low-pressure turbocharger. Air
that
leaves
the
low-pressure
F F R R O O M M C C H H A A R R G G E E A A I I R R C C O O O O L L E E R R ( ( C C A A C C ) )
F F R R O O M M C C H H A A R R G G E E A A I I R R C C O O O O L L E E R R ( ( C C A A C C ) )
E E X X H H A A U U S S T T T T U U B B E E A A S S S S E E M M B B L L Y Y
E E X X H H A A U U S S T T T T U U B B E E A A S S S S E E M M B B L L Y Y
compressor flows through the
crossover tube to the compressor
inlet of the high-pressure turbo-
charger. Air from the compressor
goes to the Charge Air Cooler (CAC).
• The CAC is mounted in front of the
radiator. The cooler is an air-to-air
heat exchanger that uses airflow to
remove heat energy from the
pressurized intake charge. Re-
ducing the temperature of the air
increases the charge density, which
larger
results in a more efficient engine
with quicker engine response and
reduced emissions.
• After the CAC, the air flows through
piping to the intake manifold where
it is distributed to the cylinders.
• Exhaust flow from the cylinders
exits the exhaust manifolds and
spools up the high-pressure turbine.
The exhaust passes through the
International
®
AIR MANAGEMENT SYSTEM
E E G G R R V V A A L L V V E E
E E G G R R V V A A L L V V E E
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
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
high-pressure turbine and enters
the low-pressure turbine. The
exhaust gases then exit the turbine
and flow out the exhaust system.
• A bypass valve controls the exhaust
flow through a passage that allows
a portion of the exhaust to bypass
the high-pressure turbine and go
directly to the low-pressure turbine.
Part of the exhaust gas that leaves
the left bank exhaust manifold is
diverted to the EGR cooler. Heat
energy is removed from the exhaust
while in the cooler and transferred
to the engine's coolant. The cooled
exhaust gases then flow through a
short internal passage in the intake
manifold to the EGR valve. The
EGR valve meters a portion of the
cooled exhaust gases into the
intake manifold where the exhaust
displaces a portion of the fresh
air charge.
VT 275 V6 Engine
B B O O O O S S T T C C O O N N T T R R O O L L S S O O L L E E N N O O I I D D
B B O O O O S S T T C C O O N N T T R R O O L L S S O O L L E E N N O O I I D D
C C O O M M P P R R E E S S S S O O R R O O U U T T L L E E T T T T O O
C C O O M M P P R R E E S S S S O O R R O O U U T T L L E E T T T T O O
C C H H A A R R G G E E A A I I R R C C O O O O L L E E R R ( ( C C A A C C ) )
C C H H A A R R G G E E A A I I R R C C O O O O L L E E R R ( ( C C A A C C ) )
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