Some people think that turbos are only good for sports cars or
racing. But there is more to a scania turbo
turbocharger than sheer horsepower and speed. In fact, the best reason for
turbocharging the engine is to enhance your driving experience.
A turbocharger in a car is attached to the exhaust manifold
and is powered by waste exhaust gases. The turbo has two main components, the
turbine and the compressor. Exhaust coming from the engine cylinders passes
through the turbine blades, causing the turbine wheel to spin.
The turbine connects to the compressor by a long shaft. As
the turbine wheel rotates, it makes the compressor wheel spin, too. The
compressor draws in air, pressurising it in the intake before pumping the air
into the engine cylinders. The Nissan turbo
amount of pressure that the air is subjected to is called boost. The more the
air is compressed, the higher the boost and the more extra power that is
generated by the engine.
At high engine speeds, the turbine can spin too quickly and
generate more boost than the system is designed to handle, especially if the
turbocharger is small. The wastegate is a simple valve that senses the boost
pressure. When the pressure reaches the desired level, the audi turbo wastegate lets some of the exhaust
gases bypass the turbine, limiting boost to safe amounts.
When air is compressed, it heats up, causing it to expand and
become less dense. This partly defeats the purpose of turbocharging, which is
to increase the density of the air going into the engine cylinders. To counteract
the expansion effect, a cooling component such as an intercooler or charge air
cooler is used. The intercooler lowers the temperature of the pressurised air
before it enters the cylinders and mixes with the fuel.
One of the drawbacks of turbocharged engines is turbo lag.
This is the delay between pushing down the accelerator and feeling the boost of
power from the turbo. It occurs because the turbine takes a little time to get
up to speed. Turbo lag can be decreased by reducing the size of the mazda turbo and using lighter materials such
as ceramic instead of steel in the turbine and compressor.
Sometimes two turbos of different sizes are installed to
overcome the drawbacks of both small and large turbochargers. In a twin turbo
system, the smaller one gets up to speed quickly for less lag during driving,
while the larger one provides the extra boost needed at higher engine speeds.
This system is efficient in delivering power under all driving conditions, but
it has the disadvantage of being much more complex than a single Mitsubishi turbo, with two sets of everything
that can potentially break down.
A turbocharged engine produces substantially more power than
a non-turbo engine, with only a small weight increase. To look at it another
way, you can put a smaller engine in the car and still obtain power equivalent
to a larger, normally aspirated engine. The additional horsepower and torque
enhance vehicle performance and drivability.
When you start the engine, let it idle for about one minute.
Don't rev the engine right away, as this forces the turbocharger to run at high
speed with minimal lubrication. And before you turn off your engine, let it
idle for one to five minutes to give the turbocharger time to cool down. A hot
shut down the moment you arrive at your destination is hard on the Mitsubishi turbocharger. Neglecting either of
these steps can result in a shortened service life or big repair bills for your
turbocharger.
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