• BMW sandbagging the F10 M5? 22 psi vs. 17 psi of boost for the S63tu compared to the X5 and X6 M S63 + higher compression ratio and VALVETRONIC

      BMW provided a press release today with some new details on the F10 M5. Included in these details were that the boost is higher at 22 psi in the S63tu (F10 M5 motor) vs. 17.4 psi in the standard S63 V8 twin turbo in the X5 and X6 M. The compression ratio is also at 10.0:1 the same as the N63. The X5 and X6 M as you remember from our twin turbo V8 comparison article have 9.3:1 compression ratios. So the F10 M5 is higher compression and higher boost yet only rated 5 horsepower higher with rear wheel drive?

      The compression ratio was not included in the press release but we e-mailed BMWNA and did receive confirmation the F10 M5 will have a 10.0:1 compression ratio. Will the pistons be the same as those in the N63? Certainly an interesting question.

      The other interesting development is that the F10 M5 S63tu will have VALVETRONIC which BMW claims effectively gives the motor 16 individual throttles. VALVETRONIC being a variable valve control system. The ECU controls engine power directly by varying lift of the intake valves. This system minimizes losses which of course provides a MPG as well as torque boost. The claim is also that it will sharpen throttle response.

      Is this car putting out more than just 5 horsepower more than the X5 and X6 M? We think so.

      This article was originally published in forum thread: BMW sandbagging the F10 M5? 22 psi vs. 17 psi of boost compared to the X5 and X6 M + higher compression ratio and valvetronic started by Sticky View original post
      Comments 63 Comments
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by dreikraft Click here to enlarge
        its starting to grow on me. but like others have mentioned... how to fit bigger snails?
        Hardware wise bigger snails can be fit, the question becomes tuning, fuel, etc.
      1. 0-60Motorsports's Avatar
        0-60Motorsports -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        This is what I'm thinking, how are they going to add more boost? Did BMW just take the aftermarket out of it?

        There has to be SOME room in there, no doubt. But, with 10.0:1 and 22 psi stock... damn.

        I wonder if the N63 and S63tu pistons are the same thing. That means S63tu rods may be a popular N63 upgrade...
        EVOLVE already had a M5 come in so we'll see what they have to say.... Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by 0-60Motorsports Click here to enlarge
        EVOLVE already had a M5 come in so we'll see what they have to say.... Click here to enlarge
        Looking forward to seeing what Evolve does with it.