What is the difference between TFSI and TSI?

1 Answers
VonPaislee
07/25/25 3:15pm
TSI has one more supercharger than TFSI. The following is the relevant introduction of TSI and TFSI: 1. TSI is the abbreviation of Twincharged-Stratified-Injection in English, which refers to twin-charged stratified injection. The supercharger uses the power of the engine itself to compress the air, while the turbocharger uses the energy of the exhaust gas in the exhaust system to drive the turbine. The turbocharger responds slowly at low engine speeds and has a lag phenomenon, while the supercharger consumes more engine power at high engine speeds, so the use of twin-charging can complement each other's advantages. 2. TFSI is the abbreviation of Turbo-Fuel-Stratified-Injection in English, which means turbocharged stratified injection engine. Compared with TSI, it lacks a supercharger. However, in China, both TFSI and TSI only have two technologies, one is turbocharging, and the other is direct injection in the cylinder.
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