
Audi 45tfsi refers to a turbocharged engine that supports fuel stratified combustion technology, where the number 45 indicates the vehicle's acceleration—the larger the number, the stronger the car's power. Taking the 2021 Audi Q3 Progressive Dynamic model as an example, it is a compact 5-door, 5-seat SUV with body dimensions of: length 4495 mm, width 1848 mm, height 1616 mm, and a wheelbase of 2680 mm. The 2021 Audi Q3 Progressive Dynamic model is equipped with a 1.4T turbocharged engine, with a maximum power of 110 kW and a maximum torque of 250 Nm. It features front-wheel drive, with a front suspension using MacPherson independent suspension and a rear suspension using multi-link independent suspension.

As a seasoned Audi driver with years of experience behind the wheel of a 45 TFSI model, I can tell you that the number 45 doesn't refer to the actual engine displacement, but rather to Audi's power designation system. In Audi's model lineup, numbers ranging from 35 to 55 indicate different horsepower ranges: 35 represents the entry-level with about 150 horsepower, 45 signifies the mid-range with 245 to 260 horsepower, and 55 denotes the high-end models with 340+ horsepower. TFSI stands for Turbocharged Fuel Stratified Injection, which combines turbocharging with precise fuel injection technology to enhance both efficiency and power. In daily driving, the 45 TFSI delivers smooth acceleration and fuel-efficient performance - I find it effortlessly overtakes on highways without guzzling fuel. Upgrading to 50 TFSI offers more brute power, though with slightly higher fuel consumption. The 45 strikes a perfect balance, making it ideal for urban commuting and short trips. Overall, this system gives Audi vehicles their signature blend of comfort and sporty dynamics.

I enjoy delving into automotive technology, and Audi's 45 TFSI badge is a simplified code based on performance tuning. The number 45 corresponds to a specific horsepower range, typically between 220 and 265 horsepower, with fine adjustments made depending on the model. The core of TFSI technology lies in optimizing combustion through high-pressure fuel injectors, paired with turbocharging to boost low-to-mid-range torque and reduce lag. For example, on the Golf-derived platform, it employs a 2.0-liter engine delivering around 249 horsepower. In comparison, the 40TFSI produces approximately 190 horsepower, while the 55TFSI exceeds 350 horsepower. From an environmental perspective, this system helps reduce emissions while maintaining driving enjoyment. During my tests of different versions, I found the 45 TFSI to be highly responsive, making it ideal for users who seek excitement without compromising practicality.

As a regular car owner, I've been driving an Audi 45 TFSI for several years. The designation refers to Audi's power level code and engine technology. The number 45 represents medium power output, not displacement size, while TFSI stands for Turbocharged Fuel Stratified Injection. This configuration delivers smooth acceleration and reasonable fuel consumption, making it ideal for daily use. Compared to other brands, Audi's labeling system helps make car selection more intuitive.


