Turbo fuel stratified injection

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For the organic anion, see bistriflimide.

Turbocharged fuel stratified injection (TFSI) denotes a type of forced-aspiration ("turbo") engine where the fuel is pressure-injected straight into the combustion chamber in such a way as to create a stratified charge. 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.[1]


Some advantages of TFSI engines:

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


  1. Huge rise of number of emitted exhaust particles
  2. Carbon build up behind the intake valves. Since fuel is directly injected inside the combustion chamber, it never gets a chance to wash any contaminants behind the valves. Resulting in excessive carbon build up.


  1. ^ "Archived copy". Archived from the original on April 28, 2009. Retrieved July 24, 2009. 

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