In a time when the world is talking about electric cars, Audi is all set to surprise the world by giving diesel technology a fresh and exciting twist. The company has introduced a brand-new version of its famous 3.0-liter V-6 TDI engine and this new engine will debut in the 2025 Audi A6 and 2025 Audi Q5.
One standout feature is that this engine can run on HVO fuel (Hydrotreated Vegetable Oil), which is a renewable diesel made from used cooking oil and agricultural waste. Using HVO can reduce carbon dioxide (CO2) emissions by up to 95% which makes this diesel much greener than before. While the engine will soon appear in the upgraded Q7 and the rumored Q9, it is unlikely to power the next-generation A7 or A8, whose future remains uncertain.
Diesel
engines are known for strong pulling power, but they often suffer from turbo lag, that is a short delay before the engine responds when you press the accelerator. Audi has tackled this problem using two technologies- a 48-volt mild-hybrid system and an electrically powered compressor (EPC).
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This is the first time Audi has combined both in a single V-6 diesel. The EPC sits behind the turbocharger and intercooler. When you accelerate hard and the turbo has not yet built enough pressure, the EPC steps in and quickly compresses air for the engine. This means almost instant response, which is similar to how an electric car reacts when you tap the pedal.
The result is impressive performance as the V-6 diesel makes 295 hp and a massive 580 Nm of torque from just 1,500 rpm. The compressor wheel spins up to 90,000 rpm in only 250 milliseconds that helps the engine build boost almost 1 second quicker than before.
The Audi A6 Sedan accelerates from 0–100 km/h in 5.2 seconds, with a top speed of 250 km/h, the A6 Avant (wagon) takes just 0.1 seconds more and surprisingly, the Audi Q5 SUV and Q5 Sportback are even faster, doing 0–100 km/h in 5.0 seconds flat. The mild-hybrid system also adds a temporary 24 hp and 230 Nm of extra push during takeoff, which makes the car feel more energetic.
Audi says durability has been improved despite the engine’s added complexity and although this engine is an evolution of the EA897 diesel family, which was involved in the Dieselgate scandal, the company insists this is their cleanest TDI ever.
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