What does Audi TFSI mean?

1 Answers
ElizabethRose
07/25/25 8:00am
TFSI stands for T+FSI, where T represents turbocharging, and FSI represents direct fuel injection. The number preceding TFSI indicates the standard acceleration time from 0 to 100 km/h. For example, 30TFSI is approximately 9.35 seconds; 40TFSI is 7.6 seconds; 45TFSI is around 6.5 seconds, and the highest, 50TFSI, is 6 seconds. More extended information is as follows: 1. TFSI is T+FSI: T stands for turbocharging, and FSI is the abbreviation for Fuel-Stratified-Injection, which means fuel stratified injection technology in Chinese. It represents a future direction for engine development. Fuel stratified injection technology is a type of lean-burn technology for engines. 2. Lean burn: This means the gasoline content in the engine's air-fuel mixture is low, with a gasoline-to-air ratio that can reach 1:25 or higher. FSI can directly inject fuel into the combustion chamber, reducing the engine's heat loss, thereby increasing output power and reducing fuel consumption, which benefits both fuel economy and performance. 3. Characteristics of the high-pressure fuel pump: The Volkswagen FSI engine uses a high-pressure fuel pump to deliver gasoline through a split rail (common rail) to electromagnetically controlled high-pressure injectors. Its feature is that a variable vortex is already generated in the intake tract, forming the optimal vortex pattern for the intake flow to enter the combustion chamber, pushed in a stratified filling manner, concentrating the mixed gas around the spark plug located at the center of the combustion chamber. This allows the lean-burn technology to achieve a mixture ratio of over 25:1, which cannot be ignited under normal circumstances, necessitating a stratified combustion approach from rich to lean. Through the movement of air within the cylinder, a rich mixture that is easy to ignite forms around the spark plug, with a mixture ratio of about 12:1, gradually thinning out towards the outer layers. Once the rich mixture is ignited, combustion rapidly spreads to the outer layers.
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