What Are The Differences Between TSi & TFSi? Which Versions Are Most Economical?

VW SEAT & SKODA Use Tsi engines but Audi Have the TFSi engine, so we unmask the confusion and explain the different terms and what they actually mean.

You'll also learn in this video which engines are the most economical, and it might surprise you know that it's not the lowest power version.

So if you are in the market for a VW group car it is helpful to understand the basics behind these terms.

Further confusing things are that the same 1.4 Engine can come in a variety of power levels, from 110 to 150hp depending on regional variations. So are these the same engine but detuned or are there actual differences between the different engines released?

Are TSi & TFSi engines the same?
What does TSi mean?
What does TFSi mean?
Do VW AUDI SKODA & SEAT All use the same engine or are they different?
Do lower power TSi engines use less fuel?
Do higher power TSi engines use more fuel?
Do lower power TFSi engines use less fuel?
Do higher power TFSi engines use more fuel?
Can you swap parts around between the TSi & TFSi engines?

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Legal Notice: Unless we have inspected your car we can only provide generic theory. All information is provided without warranty, please check any recommendations made with a mechanic locally to verify it would be legal in your area or region and that it would be suitable for your car and your needs.