A German tuning outfit called PP-Performance has put the 2012 BMW M5 on a Maha dyno, and the numbers returned were 444 horsepower at the wheel, 553 at the engine, and a "corrected number" of 574 hp. Max torque came in at 532 pound-feet (721 Newton/meters).

Compare those figures to the official numbers of 560 horses and 502 lb-ft. If the 444 number is accurate, then no matter how you slice it on horsepower – whether you use the numbers from BMW or PP-P's figures – you're losing around 20 percent from the engine to the wheels. However, adjusting for driveline and twin-turbo losses, that puts things right about where they should be. The 30-lb-ft surplus of torque, on the other hand, is the kind of surplus no one would complain about – again, assuming it's accurate.

Follow the jump for video of the dyno run, and for another vid of the M5 being taken to 293 km/hr (182 mph). And with that second vid, try to ignore the fact that the terminal velocity attempt is being conducted on an engine with just 40 kilometers on it...






I'm reporting this comment as:

Reported comments and users are reviewed by Autoblog staff 24 hours a day, seven days a week to determine whether they violate Community Guideline. Accounts are penalized for Community Guidelines violations and serious or repeated violations can lead to account termination.


    • 1 Second Ago
  • 35 Comments
      me
      • 3 Years Ago
      RWD drivetrain losses are not going to be that high (20%). Like all dyno runs, they can only really be compared with other cars run on the same dyno at the same facility. Some dyno's read way higher / lower than other models. This Maha dyno is said to give very low numbers. Some operators correct for atmospheric conditions, some don't.
        • 3 Years Ago
        @me
        [blocked]
        swede_speed
        • 3 Years Ago
        @me
        It's not just a matter of which wheels are driven. It's how they are driven also. Ie the transmission. I don't have any data to back this claim but I'd imagine a dct saps more power than a standard single clutch like everyone is used to seeing.
      gallandof
      • 3 Years Ago
      the first video didn't do the engine much justice in the sound department. Also in the 2nd video what was with the high-beams turns them on then starts flickering them like a strobe light, or is that something to do with the cars electronics?
      wcs531
      • 3 Years Ago
      "adjusting for driveline and twin-turbo losses"....seriously?? Adjusting for turbo loss????
      John
      • 3 Years Ago
      Sad really that they need twin turbos to get those numbers. Too bad the Caddy V series has more for less cash and aren't a tuner version. I wonder what a Calloway version of a Caddy V would pump out.
        Krishan Mistry
        • 3 Years Ago
        @John
        Sad really that the CTS-V needs 40% more displacement AND a not terribly efficient supercharger to make the same power as the Beemer. The CTS-V was only JUST faster than the aging V10 M5 when it came out. And the new one has 100 more lbft, 50 more hp, faster gearbox, and the latest electronic toys. And the V series (currently just one model) is basically an in house performance tuner, just like ///M, so bring in Callaway and the Bavarians might as well bring in AC Schnitzer, the one who twin supercharged a V10 M5 to 230mph.
          BobbyD
          • 3 Years Ago
          @Krishan Mistry
          It isn't JUST faster than the v10, I have ran against a few and I walk on them. The V is also under tuned from the factory for what it can do while the new M5 is tuned to the max. The V has loads more potential that is easy and cheap to unlock while the M5 is already running high compression and 22psi boost.
          jawnath1n
          • 3 Years Ago
          @Krishan Mistry
          LSX is an iron small block chevy 427ci crate motor. The LSA is whats in the CTS-V and Camaro ZL1, which is essentially a tweaked LS9. For all those discussing displacement, the motors have nearly the same effective displacement. While I'm not a huge of fan of using this logic to determine efficiency (just as relevant as the useless hp/liter metric), it is an interesting 'stat'. With FI, pressure is measured in PSI or bar. 14.7 PSI = 1 Bar. 1 bar is equal to the atmospheric air presure at sea level. When you have FI that pushes 1 bar, you're essentially doubling the naturally aspirated displacement of the engine. 1 bar = twice normal atmospheric pressure = twice as much air forced in = twice the effective displacement. More Info Here - http://www.hotrod.com/techarticles/engine/113_0312_turbo_tech_science_selection/viewall.html Now, the S63Tu in the F10 M5 has a displacement of 4.4L @ 22/PSI 1.5 bar, which means the turbos cram an additional 150% of 'displacement' into the motor. Essentially the car has 11 liters of displacement (4.4 + 6.6). The LSA in the CTS-V runs at 9PSI, or .62bar, an additional 62% over 6.2L, which gives it an effective displacement of approximately 10 liters. (6.2 + 3.84) In theory, you can say the LSA is more efficient than the S63Tu.
          kevin
          • 3 Years Ago
          @Krishan Mistry
          The LS9/LSX engines were originally designed to be twin turbo, but after Eaton demoed their new supercharger that had the same efficiency as a twin turbo setup GM changed their mind. And, yes, the LS9/LSX engines use more displacement to make the same power. That is the down side of an OHV engine, the HP per liter numbers are less impressive. The up side is they're generally lighter and have a lower center of gravity than their DOHC counterparts.
          ph00ny
          • 3 Years Ago
          @Krishan Mistry
          So how much bigger is that engine with 40% displacement than BMW's v8? It's a different engineering philosophy. I keep hearing idiots quack about displacements over and over again. Why is displacement so bad when you can achieve it in a tight, light weight package? Isn't that better than making the overall engine size bigger just to achieve some magical efficiency figure of hp/l? Also i'm well aware of the fact that countries outside of US is taxed based on displacement
          wcs531
          • 3 Years Ago
          @Krishan Mistry
          Krishan, I would bet that the new twin turbo m5 motor is heavier and is phyiscally larger than the LSA/LS9. Not to mention the m5 is running 22 psi...good luck upping the boost on that. The cts-v has a lot of headroom and is much cheaper to mod. Not trying to bash the m5 cause i would love to have one, but fanboys need to relax.
        SAM
        • 3 Years Ago
        @John
        Um, twin turbo 4.4L making basically the same power as a supercharged 6.2L? Seems pretty decent to me.
      • 3 Years Ago
      [blocked]
      PrintError
      • 3 Years Ago
      Anyone else notice that Captain Dumbass isn't wearing his seatbelt on the 300km/h run? Listen for the seat belt warning, and you can see the light in the lower right corner. Money can't buy smarts!
        Bogdan
        • 3 Years Ago
        @PrintError
        It doesn't make any difference when you crush into a bridge @ 300Km/h ...
        Omologato
        • 3 Years Ago
        @PrintError
        What you heard sir / ma'am was the "speed limit exceeded" alert / warning / chime. It looked like the first chime was at 80Mph and second at 100Mph.
        Omologato
        • 3 Years Ago
        @PrintError
        cont... You can see the digital speedo readout change to an amber "speed limit exceeded" as soon as 130kph (80mph) is exceeded
      haji
      • 3 Years Ago
      pity such a great car sounds like a fart. sure people will love the noise but thats not because it sounds good, but because the car is a bmw.
      soonermike
      • 3 Years Ago
      don'tcha think they would want to break it in properly BEFORE dyno'ing it? Patience is a virtue... ;)
        • 3 Years Ago
        @soonermike
        [blocked]
          me
          • 3 Years Ago
          There is plenty of evidence that modern engines do not need quite the level of care in break-in, however, other drivetrain components may and BMW does recommend a 1200 mile period of lower revs and speeds under 100 mph.
      IBx27
      • 3 Years Ago
      Not since the Pagani hwereary has a car sounded this apathetic towards the purpose it was built for. The first video sounds like a stock 4-cyl corolla, not a V8 of any kind.
        patrick
        • 3 Years Ago
        @IBx27
        Man I have to agree with you, this v8 sounds like Cheap Ass 4 banger, all flat and and not worthy of such a car, but man does this thing run. I blame it on the 180 degree exhaust routing into the two turbos. Maybe an x-pipe that works in reverse as itis normally suppose to do, will help. BMW fis this problem but leave the rest of the car alone.
          Aaron
          • 2 Years Ago
          @patrick
          Is there a turbo car out there whose sound you do like? Turbo cars just don't make the pretty sounds that N/A cars do. But I tend to think that the power and efficiency makes up for it.
      Eric Leippe
      • 3 Years Ago
      Yes, because it needs all that added HP to outrun everything in its class AGAIN
      Joe Bo
      • 3 Years Ago
      My brother's friend just purchased a 2 year old M5. He gets a whopping 12mpg avg. That makes the CTS V look like a prius. If I'm not mistaken, the old 454 SS got about the same gas mileage.
        jtav2002
        • 3 Years Ago
        @Joe Bo
        Considering it's a 5.0L V10 I'd take that tradeoff seeing as how when I had an 07 Impala SS I averaged the same fuel economy(albeit in winter). While I'm not making excuses for dismal fuel economy, anyone complaining about that in a 500hp car is doing it all wrong.
        SAM
        • 3 Years Ago
        @Joe Bo
        It's due to gearing with it being biased towards maximum performance. So close ratio and numerically high gear ratios. The new M5, with it's much much fatter torque curve due to the turbos is geared differently which I believe improved it's fuel economy about 30% as compared to the previous generation.
      lesanepcr0oks
      • 3 Years Ago
      If you dummies knew anything about cars, it's that an aftermarket exhaust will make it loud. Not everyone wants a loud exhaust in a luxury sports car, even if it's the mighty M5.
        Aaron
        • 2 Years Ago
        @lesanepcr0oks
        On a turbocharged car? Not unless you're running no cats no muffler, relative to the same engine N/A, anyway. The turbo quiets things down significantly.
    • Load More Comments