What does TFSI mean?
You have probably already noticed that there are additions such as TFSI, TSI and FSI to car models. You should also be aware that this has something to do with the engines. But what exactly does TFSI mean?
General information on gasoline engines and what the respective abbreviation means
In order to understand the terms TFSI, FSI and TSI, you should familiarize yourself a little with gasoline engines.
- Otto engines have spark plugs that ignite an ignitable mixture in the combustion chamber. This mixture can be used in different ways in the engine reach.
- A carburettor is well known, in which the right mixture between gasoline and air is produced, in order to then get from there into the combustion chamber.
- Instead of gasifying the fuel, it can also be injected directly. In the conventional method, this takes place in the intake manifold in front of the inlet valve. Engines that use this technology often have the addition of Fuel Injection, and abbreviations such as DFI, IDE and Jet are common references to this technology.
- If the injection is direct into the combustion chamber, you will come across abbreviations such as TFSI or FSI. FSI stands for Fuel Stratified Injection, which is translated with stratified charge process. The injection takes place in such a way that there is a normal air-gasoline mixture in the area of the spark plug, which can easily be ignited via the spark plug. In the rest of the combustion chamber there is a lean mixture that would hardly ignite on the spark plug, but can be easily ignited by the rich mixture that ignites on the spark plug.
- These technologies can be combined with a turbocharger, which uses the energy of the exhaust gases to compress the mixture. So more power can be generated.
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Differences between TSI and TFSI
- TSI can stand for Twincharged Stratified Injection and is used at VW used as a name for this technology. It is a special technology in which two superchargers are used to enable even charging across the entire engine speed range.
- The abbreviation can also stand for Turbocharged Stratified Injection, in which a turbocharger is connected to an FSI system. This system is marketed as TFSI at Audi.
- TFSI is the name used by Audi and indicates that the engine has direct injection with a stratified charge process and that there is a turbocharger. This technology is the same as the VW Turbocharged Stratified Injection (TSI) process. But you have to be careful, because TSI can also stand for Twincharged Stratified Injection, which is not the same as TFSI.
With the combination of stratified charge process and turbocharger, a 1.6-liter base engine producing 102 hp has, bring it to 125 PS, with consumption measured according to the EU third mix of 5.6l per 100 km very much is humble. That is the advantage of TFSI technology.
