Dyno Results: F10 BMW M5 underrated – 527 RWHP

BMW M5 | September 10th, 2012 by 11
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Chicago-based tuner IND takes the new F10 BMW M5 to a dyno test. On the dyno jet setup at AMS Performance shop, the F10 M5 …

Chicago-based tuner IND takes the new F10 BMW M5 to a dyno test. On the dyno jet setup at AMS Performance shop, the F10 M5 shows again that BMW has underrated the engine. The new M5 is powered by the S63 V8 4.4 liter TwinTurbo delivering 560 hp (412 kW) at 5,750 – 7,000 rpm, and maximum torque of 500 lb-ft (680 Nm) on tap between 1,500 and 5,750 rpm.

After 40 minutes of dyno runs, the IND folks found that the engine in the M5 outputs 527 rear wheel horsepower. The typical drivetrain loss is 15 percent, so in this case the expected rear wheel horsepower would be 476 (calculation based on the 560 horsepower measured at the flywheel). BMW has been known for years to not engage in a “horsepower war” and most of the engines were reporting less power on paper.

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But in this case, the flywheel and official power output seems to be realistically slightly above 600 horsepower. We expect many tuners to come out with their own upgrades to the engine that will reveal the true power of the S63Tu.

IND performed datalogging of intake air temperature, throttle position, boost pressure, engine oil temperature, and water temperature to start. More data will be gathered moving forward.

Stay tuned!

11 responses to “Dyno Results: F10 BMW M5 underrated – 527 RWHP”

  1. mckillio says:

    Any word on the torque numbers?

  2. Sajan says:

    From a business standpoint, what would be the reason for underrating the official horsepower number?

    Nissan did something similar with the R34 GT-R where they officially said it had 276bhp (at the crank), but various people dynoed their cars and found that they actually produced around 330bhp (at the crank). This was to satisfy the Japanese ‘gentleman’s agreement’ where they wouldn’t produce a car with a hp figure above that number.

    Do the Germans have something similar? I know they have the 155mph cap but what about actual horsepower numbers?

    • wazon says:

      From a business standpoint, what would be the reason for underrating the official horsepower number?”

      There seems to be no gentleman agreement with respect to hp figures in Germany. There are however two reasons for lowering real hp numbers. First, in Germany, the tax you pay for a car depends on how powerful it is. Less power, lower tax. Second, in Germany as well as in whole Europe, there is also connection between insurance costs and declared power. Again, less power, cheaper insurance. So, you make your customers saving money by underrating the power, which is good enough for doing it.

  3. Otto says:

    It’s surprising. Check one of my previous post about another F10 M5 which was brought to the benchmark. Basically, it matched the specs in power and was slightly above in torque. But well, it was a car from the media pool.
    At factory, engines of this class are individually tested. Turbocharged engines being easier to tune, I’d expect them to match the specs.
    I read once a comparison between the GT-R and the 997 Turbo. Specs were 485 and 500 respectively. Cars were from the manufacturers media pool. GT-R came up with a nice 525 and the 997 with 535. The 530 hp GT-R was officially released one year later, about the same time Porsche officially released the 530 hp Turbo S. I’m really surprised that manufacturers of this class keep cheating. Cars from the lot are under the specs and test cars are above. Silly.They should know by now testers would bring cars from the lot to the dyno test eventually. Independent dyno benchmarks are more and more common, thanks the to tuning companies.
    About the ‘Japanese’ gentlemen agreement, it has been broken years ago.

  4. viper says:

    what about torque , in my opinion even more important thing? , it must be over 700Nm at least…

  5. Sajan says:

    Is it just me or does it seem really immoral? We pay small fortunes to acquire the cars of our dreams from the marques that we love. This is something that I’ve thought about before, and it’s a huge exaggeration but if you’ve never pushed your car to it’s limits (say for example, your BMW) how would you know that the rear wheel drive car you supposedly bought was actually front wheel drive? This obviously wouldn’t happen but I hope it highlights the point i’m trying to make. About the horsepower figure : it isn’t much of a big deal but it really does weaken the trust you have with the marque that you love, doesn’t it?

  6. Sajan says:

    By the way my post wasn’t supposed to be negative in any way whatsoever.. it was just my personal thoughts on the matter.. I still love BMW more than half of the people who post on here

  7. Jan Nel SA says:

    I was very surprised by this article, so I took my 2013 F10 M5 to the dyno and sure enough, the runs confirmed it. The car made 435kw (approxiamately 585hp) and 767 Nm. I recently upgraded my E63 to buy the M5 but was weary of the power and torque produced by the Merc… Could the M5 compare? All the online vids showed the BMW to be faster, now I unserstand why. Just another note, my wife’s X5M makes about 50 hp and 70Nm less.

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