A standard Vortec 5300 5.3-liter V8 engine powers the Sierra
Hybrid and a 4-speed Hydra-Matic automatic transmission coupled
with the full-size truck segment’s first hybrid propulsion
technology for improved fuel economy.
The Sierra hybrid uses electric power even less frequently. Its
gasoline engine can shut down when the car is stopped (actually,
when it's braking to a stop, below 13 mph or so) and-that's it.
The batteries (three 14-volt units plus the standard 12-volt)
cannot power the truck at low speeds. Nor do they help out the
gasoline engine, which therefore can't be any smaller. It's the
same 5.3-liter V-8 GM pickup buyers know and love. Because of
the limited nature of this hybrid system, the benefits are mild:
roughly 2 mpg in city driving and 1 mpg during the EPA's highway
cycle.
The system replaces the traditional starter motor and alternator
with a compact 14-kw electric induction motor or starter
generator integrated between the engine and transmission. The
starter generator provides fast, quiet starting power and allows
the gasoline engine to automatically start and stop under
certain conditions to conserve fuel.
The Sierra Hybrid also offers four 120-volt/20-amp electrical
auxiliary power outlets located under the rear seat and in the
pickup bed. Because the 5.3-liter V-8 is the same as that in
non-hybrid pickups, its power and torque outputs are the same
(295 horsepower, 325 pound-feet of torque). Acceleration,
towing, and payload are undiminished. The extra hybrid gear
takes up very little space-the biggest component, the three
extra batteries, is under the rear seat. One interesting feature
of the hybrid trucks are its four, 120-volt 20-amp AC power
outlets in the cargo bed and the rear seat; but the engine must
be running in order to use them.
As in hybrid cars, the gas engine shuts off at stoplights to
save fuel, and an electric motor restarts the engine when the
gas pedal is pushed. Unlike most hybrids, the electric motor
does not help propel the vehicle. The system does include a
unique feature aimed at commercial users and picnic tailgaters:
a generator that provides 120-volt power for running electrical
accessories.
Available in California, Washington, Oregon, Alaska, Nevada and
Florida, the Sierra Hybrid delivers up to 10 percent better fuel
economy with the same power and performance as the 5.3-liter V8.
In fact, that same engine powers the Hybrid, developing the same
295 horsepower and 335 pound-feet of torque.
GM is not to be outpaced in this hurried race for the
development of producing fuel cells. With all these amazing
technological breakthroughs in the automotive industry,
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with GM's efforts of sustained production of environment
friendly vehicles.
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their GMC parts do not diminish
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