From Turbos
BENEFITS OF TURBO-CHARGED ENGINES
1. FUEL CONSUMPTION IS LESS.
Compared with a naturally aspirated
engine of identical power output, the fuel consumption of a turbocharger engine
is lower, as some of the normally wasted exhaust energy contributes to the
engine's efficiency. Due to the lower volumetric displacement of the turbo
engine, frictional and thermal losses are less.
2. POWER-TO-WEIGHT RATIO IS BETTER
The power-to-weight ratio, i.e. kilowatt (power
output)/kilograms (engine weight), of the exhaust gas turbocharged engine is
much better than that of the naturally aspirated engine.
3. ENGINE WELL REQUIREMENTS ARE SMALLER
The turbocharger engine's installation space requirement is
smaller than that of a naturally aspirated engine with the same power output.
4. TORQUE CAN BE IMPROVED
A turbocharged engine's torque characteristic can be
improved. Due to the so-called "maxidyne characteristic" (a very high
torque increase at low engine speeds), close to full power output is maintained
well below rated engine speed. Therefore, climbing a hill requires fewer gear
changes and speed loss is lower.
5. GREAT HIGH-ALTITUDE PERFORMANCE
The high-altitude performance of a turbocharged engine is
significantly better. Because of the lower air pressure at high altitudes, the
power loss of a naturally aspirated engine is considerable. In contrast, the
performance of the turbine improves at altitude as a result of the greater
pressure difference between the virtually constant pressure upstream of the
turbine and the lower ambient pressure at outlet. The lower air density at the
compressor inlet is largely equalized. Hence, the engine has barely any power
loss.
Because of reduced overall size, the sound-radiating outer
surface of a turbocharger engine is smaller, it is therefore less noisy than a
naturally aspirated engine with identical output. The turbocharger itself acts
as an additional silencer.
THE DOWNSIDES (from Automotive Training Centers)
The most immediately observable con to a turbocharged
engine is the money and time that go into it. You’re going to have to pay a
handsome sum to an automotive technician to
get your regular engine souped up and turbocharged. What’s more is that it will
require some shifting and moving under the hood, as a turbo charged engine
requires some additional wiring and tubing to function properly – cars with
crowded front ends need not apply. Though many car companies such as Volkswagen
offer factory made models with turbocharged engines, those wishing to upgrade
on their own might encounter setbacks.
Also, less gas mileage.