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OPERATION OF THE TURBOCHARGED
3.8L V-6 (CODE 3) ENGINE
Turbocharging Gives You Extra Power ...
A turbocharger is
c
i
device that supplies a conventional internal
·
combustion
engine
with extra power on
demand. Basically.
it's
a
pump powered by exhaust
~es.
··'···"'whaF
tulbl>charging
.
does is to recover some of that exhaust gas energy to
increase engine power output. The turbocharger consists of an
eXhaust-gas-
driven turbine which is coupled to a compressor in the intake
system.
As
engine
speed and load increase, exhaust gases spin the turbine, which in turn
drives the compressor and forces a
denser
ail/
fuel mixture charge into the
combustion
chambers.
This denser charge, when ignited in the conventional
manner, delivers more power per stroke of the piston than the non-
turbocharged
engine.
Since the turbocharger is powered by exhaust gases that normally
go
out the
tailpipe,
in effect it recycles energy that would otherwise be
wasted.
When we say it works
"
on demand." we mean exactly that. When the
turbocharged V-6 is driven under normal OQnditions, a normal air
I
fuel mixture
reaches the
cylinders. But,
in a situation requiring extra power in passing, for
instance
-
pressing down on the accelerator .speeds up the turbo, and the 3.8
liter V-6 engine increases its power output. When you litt your foot, the
turbocharger slows down
again.
Turbocharging has long been recognized as an answer to high-altitude
operation. Anon-turbocharged engine can Jose as much as 25% of its poWer
at 8,000 feet. Turbocharging compensates for altitude changes, letting the
engine breathe
"
sea
level"
air at
high;
"
thin air,"
anitudes.
It restores
otherwise lost power,
reduces.
gearshitting and the n9E)d for heavy pressure on
the
accelerator.
2-32
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