Startling Six Turbocharged Knowledge That 80% Of Car Owners Have Misunderstood

Nowadays, there are more and more turbocharged cars, and many car owners decide to buy them after learning about the advantages of turbocharged engines on the Internet. But you may not know that many people have a severe misconception about turbocharged engines. Today we are going to talk about the six most common misunderstandings.

1. Turbocharged power is good and fuel-efficient

In theory, a turbocharged engine uses more fuel than a naturally aspirated engine of the same displacement. More energy is efficient than more significant displacement naturally aspirated engines of the same power level. A simple example is that 1.5T is more fuel-efficient than 1.5L but more fuel-efficient than 2.0L.

Because the fundamental reason for the fuel-saving of turbocharged engines is to use turbocharging to force the cylinder to charge more air and fuel to extract power, and to obtain natural aspirated with smaller displacement and lower speed requires larger displacement and higher power output at speed. Due to the more downward displacement and revs, there is less power loss, making it more fuel efficient.

2. Gasoline burns more fully after turbocharging

Many people believe that gasoline can burn more fully with more air in the cylinders after turbocharging. This is a typical misconception. Because the turbocharger presses more air into the cylinder, the engine control computer controls the air-fuel ratio, that is, the percentage of air to fuel, and injects as much fuel as it takes in.

After turbocharging, if there is more air, more oil must be sprayed, and the overall concentration of the mixture remains unchanged, so there is no argument that the combustion is more sufficient. In addition, for a gasoline engine, even if there is more air and less oil, it may not be entirely burned because the concentration of the mixture is too low at this time, and the spark plug may not be lit at all.

3. As soon as the engine starts, the turbocharger starts to work

Turbochargers are not always working but are determined based on power demand. If your power demand is small, then the wastegate valve on the turbocharger is directly opened, and the exhaust gas enters the exhaust pipe. If the turbo is not pushed, the turbocharger will not work.

At most, it will be very low under the influence of a small amount of exhaust gas. Speed to play. If you need more power, the engine control computer will partially or completely close the wastegate valve according to the power demand. At this time, the exhaust gas will focus on the turbine output, and the turbocharger will start to work.

4. Turbocharging can improve engine thermal efficiency

Some people think that turbocharging can improve the thermal efficiency of the engine, but this is also a wrong view. The most effective way to improve the thermal efficiency of a machine is to increase the compression ratio.

The turbocharged engine presses more air and fuel into the cylinder. If the compression ratio is too large, it is easy to cause knocking due to the sharp increase in the pressure and temperature in the cylinder during ignition. Therefore, the compression ratio of the turbocharged engine is Generally lower than a naturally aspirated engine, so its thermal efficiency is definitely not as good as a naturally aspirated engine.

However, since the turbocharged engine can obtain greater torque output at low speed, and with various advanced technologies, although its maximum thermal efficiency is low, the overall high thermal efficiency range is more expansive, so it has a great effect on reducing fuel consumption.

5. Turbocharged engines must increase the grade of gasoline

Increasing the grade of gasoline is beneficial to give full play to the performance of the turbocharged engine, but it is not necessary for the turbocharged engine to increase the grade of gasoline.
High-grade gasoline is mainly to prevent engine knocking because turbocharged engines are more prone to knocking.

Once knocking occurs, it is necessary to delay ignition to eliminate knocking to avoid damage to the engine. This will cause the output torque to drop, so you can use a larger ignition advance angle to get better power after increasing the gasoline.

However, the current engine control system has a precise knock control program, which can automatically adjust the ignition timing according to the gasoline grade. Moreover, in most cases in our daily driving, the accelerator is very small, and the probability of engine knocking is very small, so as long as the manufacturer allows it, there is no problem with adding lower-grade gasoline.

6. Turbocharged engine is easy to break

Some people think that the turbocharged engine squeezes too much power, which leads to higher engine temperature and more force, so the engine is not stable and easy to break.
In fact, this statement is a bit exaggerated. Although turbocharged engines cannot be compared with naturally aspirated engines in terms of reliability, this does not mean that turbocharged engines must be loved or bad.

It can only be said that naturally aspirated engines are not easily broken. Because we rarely have the opportunity to use more than half of the power of the engine in daily use, the engine is not always in a state of extreme power compression, so the reliability is not as fragile as expected.

However, we should also recognize the fact that today’s turbocharged engines are all direct injection in the cylinder, and only a few use a more advanced hybrid injection system, and carbon deposition has always been an inextricable problem for direct injection engines.

Therefore, it is best to use the prescribed fuel additives in accordance with the manufacturer’s requirements in daily maintenance. After all, compared to the expensive maintenance costs, the detergent is not much money.