• Feb 5th 2010 at 4:54PM
  • 24
2010 BMW X6 ActiveHybrid – Click above for high-res image gallery

Wait a second here, isn't it a bit antithetical to strap a hybrid vehicle on a dyno to measure it for horsepower? Well, in some instances we might be tempted to agree – though our curious side tells us it's always good to know how much power any particular automobile makes – but definitely not in the case of the 2010 BMW ActiveHybrid X6.

After all, BMW itself proclaims that this vehicle is the most powerful production hybrid ever offered with 480 horsepower and 575 pound-feet of torque. Claims such as this must, MUST we say, be tested. Fortunately for us, the chaps over at Inside Line happen to have a dyno at their disposal, along with the aforementioned hybrid SUV. So, how'd it fair?

Measured output at the wheels came in at 368 horsepower and 402 lb-ft of torque. Now, it's expected that all vehicles will make a good bit less power at the wheels than at the engine's flywheel, which is how they are rated from the factory. But in the instance of the X6 Hybrid, it made way less than expected given its prodigious claimed figures.

There are all sorts of explanations as to why the BMW ActiveHybrid X6 may not have made as many pound-feet as expected, and you can find some of them by reading Inside Line's summary here. Acceleration tests are promised, meaning we may get an answer about those elusive few ponies soon enough. Finally, click here to read our own impressions after driving the monster hybrid SUV last November.

[Source: Inside Line]

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    • 1 Second Ago
      • 5 Years Ago
      News Flash: this whole cross-over, multi-activity vehicle thing is disappointing. How 'bout you go back to making cars people want instead ridiculous one-up-the-neighbors, soccer-mom hybrid M trucks.
      • 5 Years Ago
      Uh, nickr, check the IL article again. They say it's a Mustang AWD dyno, and the 480 hp BMW dynos lower than the 480-hp GT-R or the 480-hp 911 Turbo.

      And it's not so much the power that's low, it's the torque. BMW says 575 lb-ft; the dyno says 402. That's a way big difference.
        • 5 Years Ago

        Those numbers are still pretty consistent with powertrain losses of about 30%. Nothing to be surprised about.

      • 5 Years Ago
      the X6 hybrid is not a M hybrid truck
      • 5 Years Ago
      still not as disappointing as those rims...
      • 5 Years Ago
      it dyno'd 368 at the wheels from 480hp at the motor.. that's believable for an awd car 20-23% drivetrain loss from all wheels. useless uneducated article. plus dyno's are not all equal, it doesn't even tell you what kind of dyno is being used.
        • 5 Years Ago
        I agree with nickr. From my background (previous Honda engineer) and education (M.S. in engine and powertrain technology), drivetrain losses are up to 20% on a FWD, up to 25% on RWD, and up to 30% for an AWD car. So, the numbers quoted by Inside Line aren't anything to be surprised about.
      • 5 Years Ago
      While tq numbers are disappointing, HP is only withing 23% of the factory rating, which is not too bad
      • 5 Years Ago
      Why did BMW hire the Pontiac Aztec designers?

      sports sedan SUV station wagon...
      • 5 Years Ago
      I got in one at the Washington Auto Show. First: It's not attractive; Second: I hit my head trying to squeeze in. It felt incredibly tight inside. Sort of a small car squeezed into a big car body.
      • 5 Years Ago
      This article and test is useless. To obtain whp with a dyno the transmission will be in the gear closest to 1:1 (usually 4th in 5spd cars, probly 6th with the X6's 8spd box. The electric motors are doing nothing in this situation. So with the manufacture claims of 400hp and 450lbft for the 4.4TT V8 where the hell are these elusive ponies? Inside Line are almost as dum as BMW for making the X6 Hybrid.
      • 5 Years Ago
      I still don't like the X6.
      • 5 Years Ago
      so it's ugly, down on power, and expensive? should sell well here in america.
      • 5 Years Ago
      Forget hybrid.
      it's time to Chevy Volt
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