Turbo Fuel Stratified Injection by Audi

Turbo fuel stratified injection (TFSI) denotes a type of forced-aspiration engine where the fuel is pressure-injected straight into the combustion chamber. FSI (VAG) direct injection technology increases the torque and power of spark-ignition engines, makes them as much as 15 percent more economical and reduces exhaust emissions.

Audi is the first manufacturer in the world to claim the combination of direct injection FSI technology with forced induction in volume production. The exceptionally broad torque plateau of the TFSI engine on the one hand permits a fuel-efficient driving style with few gearshifts, and on the other hand means that only light accelerator is needed to produce impressive thrust.

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This turbo engine achieves a compression ratio of 10.5:1, a figure that is otherwise typically achieved only by naturally-aspirated engines. This, coupled with the advantages of petrol direct injection, plays a crucial role in boosting the thermodynamic efficiency compared with both manifold injection engines and conventional turbo engines.

As a result the 2.0 TFSI embarked on its success story in the Audi A3 Sportback. It is now also on offer in the Audi A4 and A6. It is available in three performance versions ranging from 170 bhp to 220 bhp. The 200 bhp version, which is used in the Volkswagen Golf GTI, provides a level of propulsive power that truly befits that car's status.


Advantages of TFSI engines:

1. Injection pressure can be regulated
2. Better fuel distribution and better fuel charge inside the combustion chamber
3. During the injection process the fuel gets evaporated, cooling the cylinder chamber
4. Higher compression ratios, which translates into more power
5. Increased fuel combustion efficiency
6. Higher power during pick-up of vehicle.