Mercedes-AMG Concept GT XX sets 25 endurance records at Nardò test

Mercedes-AMG has announced that the Concept AMG GT XX has set multiple long-distance performance records during a high-speed endurance test at the Nardò proving ground in Italy. The electric prototype, built on the upcoming AMG.EA platform, covered 40,075 kilometers in seven days, 13 hours, 24 minutes, and seven seconds, matching the circumference of the Earth at the equator.

During the test, the Concept AMG GT XX broke 25 total records, including the record for the greatest distance covered by an electric vehicle in 24 hours. The vehicle traveled 5,479 kilometers in that period, surpassing the previous record by 1,518 kilometers. Two prototypes participated in the test, completing 3,177 laps of the 12.68-kilometer track while maintaining an average speed of 300 km/h. At the finish, the two cars were separated by just 25 kilometers.

The test was designed to evaluate the durability and efficiency of new drivetrain technologies, including three axial flux motors and a directly cooled high-performance battery, both of which will be featured in future AMG.EA production vehicles. Engineers deliberately maintained a speed of 300 km/h, based on simulations showing it as the optimal balance between maximum distance and efficient charging cycles.

Charging performance was a key focus of the test. The Concept AMG GT XX achieved average charging power levels of approximately 850 kW, significantly exceeding the capabilities of current charging infrastructure. A five-minute charging session provided enough energy for approximately 400 kilometers of range under simulated WLTP conditions.

The test program included contributions from multiple technical partners, including Michelin and charging specialist Alpitronic. Mercedes-AMG engineers and drivers operated the vehicles continuously in two-hour shifts, while remote diagnostics teams in Affalterbach monitored performance around the clock.

The Concept AMG GT XX produces a peak output of over 1,000 kW, equivalent to more than 1,360 horsepower, and utilizes newly developed NCMA cylindrical battery cells with a specific energy density exceeding 300 Wh/kg. The battery’s oil-based direct cooling system enabled consistent performance and fast charging under extreme conditions. The test demonstrated that the electric powertrain can deliver sustained performance across extended periods while maintaining stability under high loads and temperatures exceeding 35 degrees Celsius.

Mercedes-AMG stated that these results validate the readiness of its upcoming AMG.EA architecture for production vehicles. The new platform will debut next year, integrating the technologies proven during the test.