Turbo fuel stratified injection - Wikipedia Turbo fuel stratified injection For the organic anion known as TFSI, see bistriflimide. This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. ( August 2009 ) 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. Contents 1 Advantages 2 Disadvantages 3 References 4 External links Advantages Some advantages of TFSI engines : 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. Disadvantages Huge rise of number of emitted exhaust particles 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. This results in excessive carbon build up over time, hindering performance. Some cars ( like the Toyota 2GR - FSE engine in the Lexus IS ) combine direct injection with traditional multi port fuel injection to ameliorate this problem. More expensive - much higher pressure fuel pumps are required to inject the fuel directly into the cylinder. This requires fuel pressures of up to 200 bar, much greater than a traditional multiport injection setup. See direct injection. References Jump up ^ `` Archived copy ''. Archived from the original on April 28, 2009. Retrieved July 24, 2009. Jump up ^ http://products.bosch-mobility-solutions.com/en/de/powertrain/powertrain_systems_for_passenger_cars_1/direct_gasoline_injection/direct_gasoline_injection_23.html External links Audi Glossary : FSI Audi Glossary : Turbocharger Automotive engine Part of the Automobile series Basic terminology Bore Compression ratio Crank Cylinder Dead centre Diesel engine Dry sump Engine balance Engine configuration Engine displacement Engine knocking Firing order Hydrolock Petrol engine Power band Redline Spark - ignition engine Stroke Stroke ratio Wet sump Main components Connecting rod Crankcase Crankpin Crankshaft Crossplane Cylinder bank Cylinder block Cylinder head ( crossflow, reverse - flow ) Flywheel Head gasket Hypereutectic piston Main bearing Piston Piston ring Starter ring gear Sump Valvetrain Cam Cam follower Camshaft Desmodromic valve Hydraulic tappet Multi-valve Overhead camshaft Overhead valve Pneumatic valve springs Poppet valve Pushrod Rocker arm Sleeve valve Tappet Timing belt Timing mark Valve float Variable valve timing Aspiration Air filter Blowoff valve Boost controller Butterfly valve Centrifugal - type supercharger Cold air intake Dump valve Electronic throttle control Forced induction Inlet manifold Intake Intercooler Manifold vacuum Naturally aspirated engine Ram - air intake Scroll - type supercharger Short ram air intake Supercharger Throttle Throttle body Turbocharger Twin - turbo Variable - geometry turbocharger Variable - length intake manifold Warm air intake Fuel system Carburetor Common rail Direct injection Fuel filter Fuel injection Fuel pump Fuel tank Gasoline direct injection Indirect injection Injection pump Lean - burn Stratified charge engine Turbo fuel stratified injection Unit injector Ignition Contact breaker Magneto Distributor Electrical ballast High tension leads Ignition coil Spark plug Wasted spark Electrics and engine management Air -- fuel ratio meter Alternator Automatic Performance Control Car battery ( lead -- acid battery ) Crankshaft position sensor Dynamo Drive by wire Electronic control unit Engine control unit Engine coolant temperature sensor Glow plug Idle air control actuator MAP sensor Mass flow sensor Oxygen sensor Starter motor Throttle position sensor Exhaust system Automobile emissions control Catalytic converter Diesel particulate filter Exhaust manifold Glasspack Muffler Engine cooling Air cooling Antifreeze ( ethylene glycol ) Core plug Electric fan Fan belt Radiator Thermostat Water cooling Viscous fan ( fan clutch ) Other components Balance shaft Block heater Combustion chamber Cylinder head porting Gasket Motor oil Oil filter Oil pump Oil sludge PCV valve Seal Synthetic oil Underdrive pulleys Portal This engineering - related article is a stub. You can help Wikipedia by expanding it. Retrieved from `` https://en.wikipedia.org/w/index.php?title=Turbo_fuel_stratified_injection&oldid=774158993 '' Categories : Internal combustion piston engines Engineering stubs Hidden categories : Articles needing additional references from August 2009 All articles needing additional references All stub articles Talk Contents About Wikipedia Čeština Español Slovenčina Svenska Українська 中文 Edit links This page was last edited on 6 April 2017, at 17 : 00. About Wikipedia

Question: what does tfsi stand for on an audi tt
Answer: Turbocharged fuel stratified injection