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    • Kratos KRAS55bi turbos setting the stock internal S55 (F80 M3/ F82 M4) power record with a 812 whp pull

      Over 800 horsepower on the stock S55 internals and the only turbo upgrade to top the 800 wheel horsepower mark on the factory stock S55 engine internals. You already saw this graph last month when the Kratos KRAS55bi S55 turbocharger upgrade was officially released but now we have the video to go along with the graph.


      How is Kratos doing what nobody else has (or can)? This is the key:

      Quote Originally Posted by Kratos
      This Dyno Graph depicts the capability of the KRAS55Bi on a stock BMW S55 engine with the supporting modifications listed above at 32psi on E85 fuel. Notice how power continues to climb to the rev limiter which is a results of the compressor wheel, turbine wheel, and manifold A/R ratio design. The goal was achieve to 800whp on a stock engine safely while limiting midrange torque and horsepower for the safety of the connecting rods. More boost or timing was not applied to the stock engine for higher horsepower figures as durability and reliability are one of the main focuses of the KRATOS brand. It's imperative that the test vehicles go through the proper sequence of durability testing at each tested power level before increases in power are applied. As KRATOS has been working very closely with BM3 and HCP tuning, with a built engine and cylinder head the KRAS55Bi will be capable of supporting up to 900whp with the proper tuning.
      Mod list:

      • Stock Engine
      • Stock Intercooler
      • Downpipes
      • Intakes
      • Spec Stage 2+ Clutch
      • Fuel-It PI
      • Maximum PSI Crank Hub
      • BootMod3
      • HCP Custom Tune
      • KRAS55Bi Turbo System (Standard Billet Wheel Option)

      Quality tuning helps make this happen on 32 psi and E85:


      A titanium version (KRAS55Ti) capable of over 1000+ whp is coming next year as well but to get the most out of it a built motor will be necessary.

      We are in a new era of S55 tuning gentlemen and Kratos is leading the way.


      This article was originally published in forum thread: Kratos KRAS55bi turbos setting the stock internal S55 (F80 M3/ F82 M4) power record with a 812 whp pull started by Sticky View original post
      Comments 12 Comments
      1. MR747's Avatar
        MR747 -
        Big power and killer car just cant get past the sound they make YUK
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by MR747 Click here to enlarge
        Big power and killer car just cant get past the sound they make YUK
        I was kind of surprised by the sound too. Not BMW's best sounding I6.
      1. Abacus38's Avatar
        Abacus38 -
        Same problem n54s had you need to put a single exhaust on it
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Click here to enlarge Originally Posted by Abacus38 Click here to enlarge
        Same problem n54s had you need to put a single exhaust on it
        No N54 has ever sounded like that. I have heard any number of exhausts on the S55 including singles, they all sound like various levels of fart box. Some worse than others, I own a fart box and love the car, but the exhaust note is terrible. No way around it
      1. MR747's Avatar
        MR747 -
        N54 sounds awesome these new ones are something else
      1. Weehe's Avatar
        Weehe -
        Stock head, but valve float!?!?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Weehe Click here to enlarge
        Stock head, but valve float!?!?
        The head is modified I believe...

        Edit: This is not the modified head car.

        Valve float is still an issue.
      1. Sticky's Avatar
        Sticky -
        Sorry for the confusion guys, 100% stock motor. This is not a car with a modified head.
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        Click here to enlarge Originally Posted by Weehe Click here to enlarge
        Stock head, but valve float!?!?
        The heads on all of our beta test S55's are completely stock. It would make absolutely no sense for us to publish hp/tq figures for our KRAS55Bi press release that the general public could not replicate on a completely stock S55 long block.

        That being said, yes we are running into valve float issues which is why we are currently working with Headgames to develop a custom beehive spring. Of course the valvetrain work Headgames is workinng on for us will also include titanium retainers and stainless steel valves along with their custom port work.

        One thing to note is that although we are running into valve float issues, we are also very close to coil bind at full lift which actually acts as a cushion during float conditions. Below is an excerpt from a thread on the S55 valve float issue written by Dave@Headgames regarding the float and coil bind cushioning effect that's happening.

        "The factory is .070 from bind at 9.99. Getting closer is not a bad thing. In fact it helps in the situation where these things are going into float. When you get closer to bind you use the coils as a "cushion" that aids in controlling the spring."
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Sales@KRATOS Click here to enlarge
        That being said, yes we are running into valve float issues which is why we are currently working with Headgames to develop a custom beehive spring. Of course the valvetrain work Headgames is workinng on for us will also include titanium retainers and stainless steel valves along with their custom port work.

        One thing to note is that although we are running into valve float issues, we are also very close to coil bind at full lift which actually acts as a cushion during float conditions. Below is an excerpt from a thread on the S55 valve float issue written by Dave@Headgames regarding the float and coil bind cushioning effect that's happening.

        "The factory is .070 from bind at 9.99. Getting closer is not a bad thing. In fact it helps in the situation where these things are going into float. When you get closer to bind you use the coils as a "cushion" that aids in controlling the spring."
        I hope this clears it up for people...
      1. RobNyc's Avatar
        RobNyc -
        That powerband is insane!
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        Click here to enlarge Originally Posted by RobNyc Click here to enlarge
        That powerband is insane!
        Click here to enlarge