WHAT IS A TURBOCHARGER AND HOW DOES IT WORK?

A turbocharger is a device

fitted to a vehicle's engine that is designed to improve the overall efficiency and

increase performance. This is the reason why many auto manufacturers are choosing to

turbocharge their vehicles. The new Chevrolet Trax and Equinox are both offered with

turbocharged engines and as time goes on, more and more vehicles will be fitted with

them. Obviously,, different brands of vehicles need different kinds of turbocharger to

fit, for example, there are

Turbocharger for

Audi,

Turbocharger for Seat,

Turbocharger for

Skoda, Turbocharger for Volkswagen,

Turbocharger for

BMW, Turbocharger for Mercedes-Benz,

Turbocharger

for Toyota, Turbocharger for Volvo,

Turbocharger

for Hyundai, etc.

How does it work?

A turbo is made up of two halves joined together by a shaft. On one side, hot

exhaust gasses spin the turbine that is connected to another turbine which sucks air in

and compresses it into the engine. This compression is what gives the engine the extra

power and efficiency because as more air can go in the combustion chamber, more fuel can

be added for more power.

Advantages

In addition to the extra power, turbochargers are sometimes referred to as devices

that offer "ree power" because unlike a supercharger, it does not require the

engine's power to drive it. The hot and expanding gasses coming out of the engine

are what power a turbocharger so there is no drain of the engine's net power.

Turbocharged engines are also not affected in the same way as naturally aspirated

engines are when they go at higher altitudes. The higher in altitude a naturally

aspirated engine climbs, the harder it becomes for it to get oxygen due to the thinning

atmosphere. A turbocharger gets around this problem because it forces the oxygen into

the engine's combustion chamber, sometimes at 2 times the pressure of the

atmosphere.

Turbochargers also improve the fuel efficiency of a vehicle however there is a

misconception when it comes to turbocharged vehicles and fuel efficiency. Taking a

naturally aspirated engine and slapping on a turbocharger on it will not improve fuel

efficiency. The way that manufacturers improve fuel efficiency though turbocharging is

by down-sizing an engine and then turbocharging it. For example, take a 2.5L inline-4

cylinder naturally aspirated engine and decrease the displacement to 1.4L and then

turbocharger it. The smaller, turbocharged engine would still have the same performance

figures (or slightly better) but because of the smaller displacement, it would also use

less fuel.

Disadvantages

Turbochargers have 2 main disadvantages when compared to a naturally aspirated or

supercharged engine. Firstly is heat. Because a turbo is powered by hot exhaust gasses,

it gets very hot. Sometimes under certain engine conditions, the turbocharger itself

could start glowing red but of course this doesn't happen in everyday driving

conditions; it happens when the engine is pushed to its limits for a continuous amount

of time. This is why you see some turbocharged sports cars with vents in the hood or

down the side, it's to try to get air moving through the engine bay and keep things

cool.

The other big disadvantage of a turbocharger is something called turbo lag. Under

certain conditions, whenever you put your foot down on the throttle, there is a delay

between the time you demand power from the engine and the moment you actually start to

feel it. That is turbo lag. When the engine's speed is low, there isn't a lot of

exhaust gasses passing through the turbocharger so when you do demand power from the

engine, the turbocharger turbine needs time to start spinning at an optimal speed. The

effects of this can be reduced by downshifting to a lower gear but keen drivers can

still sometimes notice the split delay in response.

So the next time you're in a GM showroom, don't overlook the turbocharged

vehicles. They offer the same or more power as V6 or sometimes even V8 counterparts and

they usually have better fuel economy due to the smaller displacement engine and less

weight.