What does 45tfsi mean?
2 Answers
TFSI stands for Turbocharged Fuel Stratified Injection. The number 45 does not represent its displacement of 4.5L; it is a value calculated through a formula. The G-value is used to indicate the overall acceleration feeling of the vehicle model. The larger the number, the faster the acceleration. The G-value is determined by the average acceleration (a) of the vehicle completing a 0-100 km/h sprint, multiplied by 10. TFSI refers to an FSI engine with turbocharging (T), abbreviated as TFSI, commonly used in Audi series models. For Volkswagen series, engines with direct injection (I), turbocharging (T), and mechanical supercharging (S) are abbreviated as TSI. FSI is an acronym for Fuel-Stratified-Injection, meaning fuel stratified injection. Fuel stratified injection technology is a type of lean-burn technology for engines. Lean burn, as the name suggests, means the gasoline content in the engine's air-fuel mixture is low, with a gasoline-to-air ratio that can reach below 1:25, achieving high combustion efficiency, economy, and environmental benefits.
I've been driving an Audi for a while. The 45 TFSI refers to Audi's power level designation, where TFSI stands for Turbocharged Fuel Stratified Injection technology, known for its efficiency and energy-saving features. The number 45 reflects the horsepower range, typically around 230 to 250 horsepower, equivalent to a 2.0-liter engine configuration. It's not a direct displacement value but rather a simplified grading system based on acceleration performance, similar to how 35 represents an entry-level model with about 150 horsepower and 55 indicates a higher-end model with over 300 horsepower. The 45 level is suitable for daily use, offering smooth city driving and effortless highway overtaking while balancing fuel economy. I've discussed this system in car enthusiast groups, where it's seen as a convenient way to compare models when choosing a car, such as the A4 or Q5, which often come with the 45 suffix to help quickly identify performance. Understanding this system also gives confidence when purchasing used cars.
