Engineering Explained

Audi's Clever Twin-Turbo Trick - Sequential Exhaust Valves!

30 January 2026 1:08 576K views 0 logs

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Intake valves dipped in gold?! While it sounds cool, those are actually exhaust valves, and... they’re just highlighted in yellow. But you might notice something strange: only the yellow valves open up to release the exhaust gases - a clever strategy Audi has implemented for their twin-turbo V8 engine. You see, at low RPM, there’s not enough exhaust gasses to keep both turbos at full tilt, so only one exhaust valve opens, and all of this exhaust routes through a single turbo. However, as the engine RPM rises, one turbo is simply not enough. A pin drops down, sliding a camshaft collar over t...