Turbocharging technology is a patented technology of Volkswagen. Its full name is TFSI, T is turbocharging, F is supercharged, and SI is direct injection in cylinder. However, due to the influence of road conditions, air quality, fuel quality and other factors in China, it is rarely "F". Technically, the engine structure will be more complicated and compact. Turbocharger refers to the device that the exhaust gas produced by the exhaust pipe increases the air pressure in the intake pipe through two coaxial impellers. In-cylinder direct injection needs to involve the high-pressure injection of fuel, the design and manufacture of high-pressure fuel rail, cavitation and gas resistance, as well as the pressure resistance and materials of various components of the engine. The application of turbocharging and in-cylinder direct injection technology in automobiles can theoretically reduce fuel consumption and improve engine efficiency. (ps: At the beginning, Volkswagen added stratified combustion technology to the explanation of "SI" to improve the ignition efficiency, but the effect was not satisfactory)
From the economic point of view, although the fuel consumption has decreased, the purchase price of the whole vehicle will increase.
from the point of view of ride comfort and driving pleasure, the vehicle with turbocharging technology has stronger power, and the comfort and ride passability are related to the working condition of vehicle suspension, tire type, road condition and road grade.
this is my humble opinion, and I hope it can help you.