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The 4.0-liter twin-turbo V8 is a prominent engine format in performance and luxury vehicles, but the available examples do not show that it dominates the wider auto industry. It is also not one standardized engine: manufacturers use different designs, supporting systems and calibrations, and a car’s headline power may include electric-motor output.
What “4.0-liter twin-turbo V8” means
“4.0-liter” describes an engine’s approximate swept volume, “V8” its eight cylinders arranged in two banks, and “twin-turbo” the use of two turbochargers to compress intake air. The label identifies a broad engine format, not a single design shared across brands. Displacement, turbo layout, output, hybrid assistance and the vehicle each engine serves can all differ.
Specific engineering details should be tied to the engine they describe. Audi says the two twin-scroll turbochargers in the RS 6 4.0 TFSI are positioned in the inner V, with each turbo supplying one cylinder bank. Audi also documents 48-volt mild-hybrid equipment and cylinder deactivation for the RS 6 generation covered by its technical description. Those details should not be assumed to apply to every 4.0-liter V8.
Porsche’s 2016 engineering account describes its own 3,996 cc, 90-degree V8 with centrally arranged turbos, direct petrol injection and cylinder deactivation. It is useful background on that design, not evidence of how common the engine is today.
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Where manufacturers use this engine format
Official specifications show the format across performance SUVs, luxury SUVs and grand touring cars. These are representative examples, not a complete global list of vehicles or proof of market-wide prevalence.
| Vehicle or application | What the manufacturer specifies | How to interpret it |
|---|---|---|
| Porsche Cayenne, MY2026 | Porsche lists 3,996 cc twin-turbo V8s in the Cayenne S, GTS, Turbo E-Hybrid and Turbo GT. Maximum-power entries across those cited V8 variants range from 468 hp to 650 hp. (Porsche Newsroom, MY2026 technical data) | These are different trims, not one engine rating. The Turbo E-Hybrid combines an engine and electric motor, so engine output and system output must be kept distinct. |
| Audi RS 6 4.0 TFSI | Audi describes two twin-scroll turbochargers, mild-hybrid equipment and cylinder deactivation for the specific RS 6 generation covered by its technical page. | The cited technical description is generation-specific; it does not establish features for every Audi 4.0-liter V8. |
| Bentley Continental GTC Azure | Bentley lists 671 bhp combined system power for the cited hybrid variant. | This is hybrid system power, not an engine-only rating. |
| Bentley Continental GTC Mulliner | Bentley lists 771 bhp combined system power for the cited hybrid variant. | This is also a hybrid system total. Do not compare it directly with a combustion-engine-only figure. |
| Bentley Bentayga, 2026 brochure configuration | The 2026 model-year customer book lists a 4.0-litre twin-turbocharged V8 at 550 PS and 770 Nm. | These figures apply to the described configuration and brochure context. |
| Mercedes-AMG G 63, 2025 US update | Mercedes-Benz identifies a handcrafted AMG 4.0L V8 biturbo and a 48-volt integrated starter-generator. | This is evidence for the G 63 update, not for every Mercedes-AMG model. |
| Aston Martin DBX S | Aston Martin’s international page gives 727 PS; its US page gives 717 HP for the upgraded 4.0-litre twin-turbo V8. | Keep the market and unit with the figure: PS and HP are different units, and the pages are regional specifications. |
How to compare power figures fairly
Start with the exact vehicle, model year and market. Then check whether a figure belongs to the combustion engine alone or to a hybrid system, and retain the unit used by the manufacturer. Horsepower units such as hp, PS and bhp are not interchangeable labels, so avoid silently treating them as identical.
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The Cayenne GTS illustrates why model-year and market context matter. Porsche’s US announcement for the 2025 model reported 493 hp. Its international press-kit materials for the updated GTS state 500 PS (368 kW) and 660 Nm. These are source-specific figures and units; neither should be substituted for a different Cayenne trim’s rating.
For comparisons that go beyond peak power, include torque and the rpm range where it is available if the manufacturer provides it. Also consider the vehicle’s role: the same broad engine format can serve a performance SUV, a luxury SUV or a grand touring car. Without comparable test conditions and a defined use case, a single “best” ranking would be misleading.
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Is a 4.0-liter twin-turbo V8 better than a V6?
There is no universal answer in the cited specifications. A V8’s cylinder count and two turbochargers do not, by themselves, establish that it is better for a particular driver than a V6. The relevant comparison is between specific vehicles and trims, with the same kind of output figure, market and model year in view. These manufacturer examples do not establish comparative fuel economy, ownership cost or performance under common test conditions.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the examples do—and do not—show
The examples establish that manufacturers use 4.0-liter-class twin-turbo V8s in notable performance and luxury applications, with differing designs and outputs. They do not establish the engine format’s share of global production or sales, or that it is dominant across the auto industry. Nor do the cited specifications establish a reliability ranking, lifecycle cost or repair requirements. Those questions require vehicle-specific evidence beyond an engine label.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
