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    • BMW F10 M5 severely underrated - Dyno shows 527 rear wheel horsepower SAE on a dynojet completely stock

      We knew the upgraded S63tu (technical update) Twin Turbo 4.4 liter V8 in the F10 M5 would be stronger than the standard S63 Twin Turbo V8 4.4 liter units in the X5M and X6M even accusing BMW of sandbagging. We just did not think it would be this much stronger. We first reported on the differences between the S63 V8's in the M SUV's and the F10 M5 in June of last year and the M5 S63tu V8 has higher compression at 10.0:1 versus 9.3:1 and runs more boost at 22 psi versus 17 psi for the SUV's.

      Well, the end result is 527 rear wheel horsepower completely stock on pump gas. This dyno comes to us courtesy of our Premier Vendor IND-Distribution whom we thank for sharing it with us.

      To put this power in perspective, the X5M and X6M put down 456 all wheel horsepower stock on 93 octane in SAE on a dynojet. So the M5 is much, much stronger partially due to routing the power to the rear wheels with a dual clutch transmission versus all four with an automatic and also due to more boost with higher compression.

      For those who like to calculate drivetrain losses, the M5 is rated at 560 horsepower stock. That would put the drivetrain losses at 6%. Using the traditional dynojet standard of 15% the rear wheel horsepower should be at 476. BMW is underrating the new turbo motors and especially the M motors considerably. We are definitely glad they are over-delivering.


      This article was originally published in forum thread: BMW F10 M5 severely underrated - Dyno shows 527 rear wheel horsepower SAE on a dynojet compeltely stock started by Sticky View original post
      Comments 43 Comments
      1. Remonster's Avatar
        Remonster -
        Click here to enlarge Originally Posted by Sorena Click here to enlarge
        Wonder why they didn't do it in 5th. It's 1:1.
        If you want my opinion, I think it's because they would have had a more reasonable horsepower number and they knew this 527 number would get a ton of attention. I'm pretty sure it's more inflated from the Dynojet and the 3rd gear run than it is because the engine is underrated, though it probably is pretty underrated.

        And Sticky, I hope you emailed them so they can fix their typo.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Remonster Click here to enlarge
        And Sticky, I hope you emailed them so they can fix their typo.
        I did... and they did Click here to enlarge
      1. m54b25's Avatar
        m54b25 -
        Here's a AMG E63 non-performance w/RT software upgrade only. Had some tire slip on dyno. The F10 M5 it's still impressive for a 4.4L.