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Turbo fuel stratified injection (TFSI) denotes a type of forced-aspiration ("turbo") 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
Some advantages of TFSI engines:
Injection pressure can be regulated
Better fuel distribution and better fuel charge inside the combustion chamber
During the injection process the fuel gets evaporated, cooling the cylinder chamber
Higher compression ratios, which translates into more power
Increased fuel combustion efficiency
Higher power during pick-up of vehicle.