As the ultimate embodiment of the TT lineup, the RS adds even more performance swagger to the third-generation coupe’s brazen face. But unlike the previous TT RS, which at times felt like a brilliant engine in search of a proper home, the new TT RS feels like a much more cohesive package.
It all starts with the sound: push the start button on the steering wheel, and the engine announces itself with a proud woof and crackle. The 2.5-liter inline-five pours out 400 horsepower and 354 lb-ft of torque, and is 57 pounds lighter than the old turbo-five, thanks to an aluminum block, a hollow crankshaft and a magnesium oil pan frame. For those holding out hope to see this engine in a more practical application, you’re basically out of luck. According to Audi, the engine is too long to fit under most modern hoods. As tantalizing as the idea of a five-pot S4 might be, it’s not going to happen. If you want the new 2.5 in something other than the TT RS, your only option is the new RS 3 sedan.
The engine note is distinctive; it’s so sweet, especially when it gets angry. As the revs climb, the raspy growl smooths out and blossoms into a gorgeous whirr of harmonics, finally building to a keening fortissimo that’s as melodic as it is mechanical. The turbo adds to the symphony with a joyous whistle. It’s a shame that an engine with such raucous sophistication will only see use in niche models.
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