What Do Audi Engine Numbers Like 30 TFSI, 35 TDI and 50 TDI Mean?

Audi’s engine names can seem confusing at first glance, especially when you see numbers such as 30 TFSI, 35 TDI, or 50 TDI instead of the traditional “1.4” or “2.0” badges.

These numbers represent engine power, not size. Audi designed this system to make it easier to compare performance across petrol, diesel, and hybrid engines.

This guide explains what TFSI and TDI mean, how Audi’s numbering works, and which engine type fits your driving style.

What Does TFSI Mean on an Audi?

TFSI stands for Turbocharged Fuel Stratified Injection — Audi’s term for its turbo-petrol engines. These use direct injection and a turbocharger to give quick throttle response while remaining fuel-efficient.

You’ll find TFSI engines in models such as the A1, A3, A4, and Q3. They’re ideal for drivers who prefer quiet, smooth petrol power.

Also Read:  Car Engine Meanings

What Does TDI Mean on an Audi?

TDI stands for Turbocharged Direct Injection. It’s Audi’s long-running diesel technology known for torque and motorway efficiency.

If you cover long distances or want strong pulling power, a TDI model is the better option.

TFSI vs TDI - Key Differences

How Audi’s Engine Naming System Started

Audi introduced the number-based system in 2017 to unify naming across petrol, diesel, and hybrid cars.

Each two-digit number represents an approximate power band (in bhp).

For example, a 35 TFSI and 35 TDI both produce around 150 bhp, even though they use different fuels.

This makes it easier to compare cars by performance rather than engine size.

Understanding Audi’s Numbering Bands

What Does 30 TFSI Mean?

The 30 TFSI badge appears on Audi petrol engines producing about 110 – 130 bhp.

You’ll see it on smaller models such as the A1 and A3 — perfect for everyday city use.

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What Does 35 TFSI Mean?

A 35 TFSI makes around 150 bhp from a 1.5 L or 2.0 L turbo-petrol engine.

It offers a good mix of power and efficiency for models like the A3, A4, and Q3.

What Does 40 TFSI Mean?

The 40 TFSI is usually a 2.0 L turbo petrol producing roughly 190 bhp.

It delivers stronger acceleration and is fitted to cars such as the A4, A5, and Q3.

What Does 35 TDI Mean?

35 TDI designates a 2.0 L diesel with about 150 bhp.

It’s one of Audi’s most popular engines, balancing fuel economy and torque.

What Does 50 TDI Mean?

The 50 TDI badge belongs to a 3.0 L V6 diesel producing around 286 bhp.

It powers executive models such as the A6, A7, and Q7, offering effortless long-distance performance.

What About Audi Hybrid and Electric Engines?

Audi now uses TFSIe for plug-in hybrids and e-tron for fully electric models.

• TFSIe combines petrol power with an electric motor for short-range EV driving.

• e-tron vehicles are fully electric, such as the Q4 e-tron and Q8 e-tron.

These don’t use the number-based system since their performance is measured differently.

Which Audi Engine Is Right for You?

What About S and RS Models?

High-performance models such as the S3, RS5, and RS6 skip the numeric system.

They use trim names (S or RS) instead, as these versions have distinct engines and power levels.