Porsche Embraces Hybrid Drive with 2025 911 GTS

The iconic 911 debuts Porsche’s use of hybrid-electric drive on sports cars, with a focus on performance.

Dan Carney, Senior Editor

May 28, 2024

4 Min Read
The 2025 Porsche 911 GTS carries the model's first hybrid-electric drivetrain.
The 2025 Porsche 911 GTS carries the model's first hybrid-electric drivetrain.Porsche

At a Glance

  • 532 horsepower
  • 3.9 seconds 0-60 mph
  • 183 mph top speed

“I can promise you that nobody needs to worry about the word, ‘hybrid’ in a 911,” pledged Porsche’s vice president for its 911 and 718 sports car models, Frank Moser, “because our hybrid concept offers significantly enhanced performance and even more driving pleasure than the previous model.”

That’s thanks to a series of firsts for the 911. In addition to the installation of an electric motor that supplements the 911 Carrera GTS's signature flat-six boxer combustion motor with an additional 59 horsepower and 110 lb.-ft. of torque, it also receives a new BorgWarner electric turbocharger. The pushbutton start is a first for a 911, and for the first time, the 911 is an actual two-seater.

Since 1964, the 911 has carried a uselessly tiny back seat, but the GTS skips the pretense and has only a parcel shelf behind the front seats. The make-believe back seat is still available as a no-cost option.

The e-turbo not only uses its electric motor to keep the turbocharger spinning at high boost levels for lag-free throttle response from low rpm, but it turns into a generator, harvesting electric power from the fast-flowing exhaust stream at high rpm. The 11 kilowatts of power it recovers can go straight to the hybrid-electric motor, adding 15 horsepower at the car’s power peak.

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This technology, which has been called MGU (Motor Generator Unit)-Heat by Formula 1, has been a key component of F1 power units during the hybrid era. Rules makers have excluded this technology as part of the cost-saving specifications for the 2026 season, which will let Porsche ad copywriters indulge in some hyperbolic claims of using “technology that is banned in Formula 1!”

Electrification would seem to add complexity to the turbocharger. In fact, having an electric motor to prevent turbo lag eliminates the need to run two smaller turbos, whose lower-mass turbines were more responsive to increases in exhaust flow than the single large turbo used now. Additionally, the sole remaining turbocharger needs no wastegate to release overpressure because boost is controlled by the unit’s motor/generator.

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The hybrid-electric motor is packaged between the combustion engine and the 8-speed dual-clutch transmission. It contributes 54 hp and 110 lb.-ft of torque, so the gearbox has been reinforced to withstand the additional power.

The 911 GTS stores its electric energy in a compact 400-volt, 1.9-kilowatt battery that is mounted beneath the car’s front hood, right where the regular 12-volt battery was previously. That battery used to be absorbent gas mat (AGM) technology, but has been relocated beneath the rear parcel shelf and shrunk by switching it to lithium-ion chemistry.

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With 400 volts of juice coursing through the GTS’s copper veins, the car replaces the previous belt-driven air conditioning compressor with an electric-powered compressor. This shrinks the combustion engine’s package space, leaving room for the pulse inverter and DC-DC converter above the engine.

Not all of the GTS’s news is electric. The horizontally opposed boxer combustion engine gets major changes, including an increase in displacement from 3.0 liters to 3.6 liters as a result of an increase in cylinder bore to 97 mm and a stroke that is lengthened to 81 mm. The combustion engine produces 478 hp and 420 lb.-ft. by itself, and the combined power unit produces a total of 532 hp and 449 lb.-ft. That marks a 59-hp advantage over the outgoing 911 GTS versus a weight penalty of 103 lbs.

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It is worth remembering that the 2024 911 GTS provided plenty of performance, so there is no low-hanging fruit waiting to be gathered by this 2025 model. So all of these improvements yield the modest benefit of improving 0-60 mph acceleration by a single tenth of a second, to 3.9 seconds, and increasing top speed by a single mile per hour, to 183 mph. All of the improvements combine to shave 8.7 seconds off the car’s Nurburgring Nordschleife lap time.

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But it is the job of Porsche’s engineers to keep pushing performance forward, however hard that might be, and they’ve accomplished that here. “We developed and tested various ideas and approaches to decide on a hybrid system that optimally suits the 911,” recalled Moser. “The result is a unique powertrain that is well-integrated into the overall concept and enhances the performance significantly.”

The starting price for the 2025 911 Carrera GTS is $180,195.

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About the Author(s)

Dan Carney

Senior Editor, Design News

Dan’s coverage of the auto industry over three decades has taken him to the racetracks, automotive engineering centers, vehicle simulators, wind tunnels, and crash-test labs of the world.

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