Underneath its outrageous styling, the BMW XM is an odd SUV that puts performance and the driving experience first in a larger segment than the average quick SUV. That, of course, means the car comes with huge listed power: With hybrid assistance, the brand says the car makes 644 horsepower and 590 lb-ft of torque. A recent dyno run suggests that number may be even higher.

The numbers come from IND Distribution, the same performance parts company that tested the latest M2 on a dyno last month. That car produced astonishing numbers, creating more power at the wheels than BMW claims the car makes at the crank. The XM is not quite as exceptional, but the 615 hp and 569 lb-ft of torque at the wheels in this test still suggest that BMW is again under-rating the output of the hybrid drivetrain. At a 15% drivetrain loss, that comes out to 707 hp and 615 lb-ft of torque. Factor in an ultra-conservative 5% and the car is still slightly ahead of BMW's listed numbers, producing 646 hp and 597 lb-ft of torque.

The XM's status as a performance-oriented hybrid does skew these results, as the IND Distribution team was not certain exactly when and how much of the car's additional electric assistance contributed to this final number. As the car was in a dyno mode and was not fully charged, it is unclear to the testing team if the electric motors were contributing their peak output or if they had more to give. While the car overperformed expectations either way, this could contribute to why the margin between reported and tested numbers is smaller here than in other tests of recent BMWs.

Via Motor1.

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