What do the letters TSI in cars stand for?

[GabrielleFitz]

In automotive terms, TSI stands for Turbocharged Stratified Injection. Specifically, T represents Turbocharger, S stands for Stratified combustion, and I denotes direct Injection. In its strictest technical definition, TSI technology combines twin-charging (dual supercharging) and stratified direct injection, requiring relatively advanced engineering. The following explains stratified combustion and direct injection: Advantages of stratified combustion: This refers to the fuel injection process where atomized fuel forms a gradient from rich to lean mixture within the cylinder. The spark plug then ignites the air-fuel mixture according to this stratified gradient. Key benefits include improved fuel efficiency, better combustion performance, and reduced emissions. Advantages of direct injection: Direct injection means the fuel injector, like the spark plug, is mounted inside the combustion chamber. The injector sprays fuel directly into the cylinder for combustion. Primary advantages include precise control over the air-fuel mixture ratio and reduced carbon buildup in the intake tract.