<Table> <Tr> <Td> </Td> <Td> 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) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> 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) (Learn how and when to remove this template message) </Td> </Tr> <P> 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 . </P> <P> Some advantages of TFSI engines: </P>

What does tfsi stand for on an audi tt