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    • Global Motoring Group's KRATOS Brand releases 850+ whp capable KRAS55Bi F80 M3 & F82 M4 forged billet aluminum S55 turbo upgrade - Specs, dynos, pricing

      For many readers the KRATOS name is new but you will get used to seeing it. This is a premium aftermarket turbo manufacturing brand designed to be the best and set the standard. Currently, KRATOS covers the McLaren M840T, Mercedes-AMG M177/M178, and now they are adding a high end BMW M S55 offering.


      Greek God, KRATOS, is the personification of Strength and Power in Greek mythology. This ethos has defined the direction of the KRATOS brand.

      KRATOS came into conception through a group of engineers with 25+ years of private label design and manufacturing turbo systems for various house-hold name performance brands. These engineers saw a untouched segment in the high end European market for True OEM Style Dual Ceramic Ball Bearing Turbo System Manufacturing and through that revelation the KRATOS brand was born.

      KRATOS systems are forged from the finest raw materials and assembled with strenuous attention to detail. Every component is purposefully designed and engineered-in-house and tested to extreme standards. KRATOS is The Only True Dual Ceramic Ball Bearing OEM Fit CORE-LESS Turbo System Manufacturer.

      KRATOS aims to provide exclusive turbo systems for premium European performance vehicles. This goal is achieved through pride and purity of engineering as well as uncompromised use of top tier materials and manufacturing methods.

      KRATOS was recently acquired by Global Motoring Group LLC, not to be confused with racing company GMG. This has further emphasized the focus of the KRATOS brand is to provide OE fit turbo solutions to top tier European performance cars.

      All Global Motoring Group brands maintain a focus on manufacturing and sell product through the vendor network. All interested consumers can find a licensed dealer in their area through direct contact with a Global Motoring Group representative at info@asrkratos.com.

      Global Motoring Group ensures that sufficient KRAS55 stock is kept to reduce the chances of backorders and shortages. All buyers can expect their products to be shipped within 24-48 hours after their purchase no matter the season. This being said, high volumes of interest have been observed and many of the first units to ship will be spoken for. Due to this, we will be opening a pre-order list for customers who would like to reserve systems that will be first to ship. More information on preorders will be made available in the coming weeks.

      Current KRATOS Platforms include BMW S55, Mercedes Benz M177/M178, and Mclaren M840T (Currently in R&D Phase).

      You will recall the KRATOS S55 turbo offering announced as in development over a year ago. KRATOS displayed the product at SEMA 2017 and since then it was tested extensively in race car as well as streetcar applications.


      When BimmerBoost says extensive testing, we mean extensive testing:

      Quote Originally Posted by KRATOS
      Product prototypes have been in testing through 20k+ miles of daily driving at 750whp+ on beta test vehicles. In addition, KRATOS was approached by Strom Motorsports road racing team due to the inefficiencies and failures of the factory turbos they had experienced. Strom Motorsports recently took first place in the GT4 class at the Bathurst 12HR. Durability and endurance testing has primarily been completed Stromís 25HR endurance M4 race car as well as their time attack M4.

      What sets the KRATOS KRAS55Bi S55 turbo upgrade apart?

      Well for starters, it is a true twin turbo upgrade. No OEM cores are required. They are not modifying stock housings and just trying to jam in the biggest off the shelf wheel they can fit. This upgrade was designed to be a complete replacement and engineered with specific goals in mind.

      KRAS55Bi: 850whp+

      • Forged Billet Aluminum
      • 3rd order Geometry Design
      • Point Milled Manufacturing

      These turbos are good for 850+ whp and have been run on stock S55 internals at over 750 whp. You may be asking, how does the motor hold together on these turbochargers at over 750 whp but not with other options?

      This is the key. Rather than pushing impellers out of their efficiency range or generating a ton of heat quality tuning paired with proper sized turbos for the application means a far more efficient design. Less boost pressure to hit the same targets means less heat. You lower component stress, cylinder pressure, and reduce the point of detonation.


      The wheels and housings are engineered for this:

      Quote Originally Posted by KRATOS
      KRATOS compressor wheels are in a league of their own. Each compressor wheel is designed and tested in house for each specific application in mind. These compressor wheels will only be found on KRATOS products and hundreds of hours have been spent on testing and design in order to match the intended use. KRATOS also performs shaft speed testing to ensure that compressor designs are not being run beyond their efficiency range or flow capabilities.
      Let's take a look at the fitment. When tuners try to fit larger aftermarket turbochargers they often run into fitment issues. It is not as simple as just bolting on some larger turbos.

      KRATOS fitment features:

      • Utilization of OEM Oil + Water lines.
      • Full reversibility.
      • Full compatibility with OEM fit aftermarket parts

      Bolts in and uses all the OEM lines.

      Quote Originally Posted by KRATOS
      The integration of ceramic ball bearing technology into true OEM fitment is unique to the KRATOS brand. Like all other KRATOS line of products to follow, the KRAS55 series retains use of factory oil and water lines without use of adapters of any sort. Many customers may weigh downtime and core usage as important factors in their buying decision. KRATOS products allow customers to retain their cores for whatever use they prefer and create no downtime other than installation.

      As this is a full upgrade, the turbos are joined with the KRATOS manifolds. The manifold design is another reason the KRATOS KRAS55Bi turbo upgrade produces more power and torque and less boost pressure.

      Focus on the 1.1:1 backpressure rating:

      Quote Originally Posted by KRATOS
      The cornerstone of the KRAS55 line of turbos, the completely re-engineered one piece turbofold is a part of the reason of safe power can be achieved. The turbofold reduces backpressure significantly, making engine operation at higher output safer and more reliable. In testing, data proved a 1.1:1 Backpressure rating at 32psi. A car making 32psi of boost would see 35.2psi of pressure on the manifold side. This allows for the engine to cycle without additional stress of vacating spent exhaust through a manifold with high resistance. If not addressed, excessive back pressure causes undue stress resulting connecting rod failures as well as loss of power and engine efficiency.

      • Mathematically matched A/R ratio.
      • Reduced heat and increased turbine efficiency.
      • Smoother internal runner transitions.
      • Increased runner diameter.
      • Computational Fluid Dynamics modeling software tested.
      • 316 Stainless Steel.


      Anything else to focus on? Yes, the patent pending Ceramic Ball Bearing Cartridge. Nobody else uses ceramic ball bearings in true OEM fitting cartridges.

      • 5x the service life of steel ball bearings.
      • Significantly lower operating temperatures than steel ball bearings.
      • Increased efficiency and thrust load capability.
      • Near frictionless operation requiring minimal oiling.
      • Heightened transient response.


      Also the inlet design:

      Quote Originally Posted by KRATOS
      The factory S55 turbo inlets at their narrowest point have an internal diameter of 42mm. This poses a problem if a compressor wheel with a larger inducer diameter is used. To address this, all KRAS55 turbo systems include a set of custom designed 4 ply silicone inlets as well as a matched ported billet aluminum elbow which are designed to support flow capabilities of even the larger wheel options.
      • Direct fitment to OEM crankcase ventilation and intakes.
      • Custom Designed 4-ply silicone inlets.
      • Polished and match ported billet aluminum elbow.



      Now no doubt you want to see the dyno data but it was important to explain how and why this output was achieved.

      Test car modifications:

      • 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)

      This is a stock S55 motor, on the stock intercooler, topping 800 wheel horsepower:


      That is 812 wheel horsepower which is the record for S55 stock internals (to be noted no built motor twins have hit this number either) and achieved on 32 psi of boost with E85. Nobody else is even close at that boost level and remember the previously covered S55 cylinder head work from Headgames? Combine that head with the KRASS55Bi and supporting engine internals and suddenly cracking 900 whp is within reason:

      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.
      The weaknesses in the S55 head were discovered due to Kratos pushing the limits in testing in both race and street car applications. They reached out to Headgames to work together on the S55 head solution. You will soon see others running the Headgames S55 head.

      Yes, pump gas testing on 93 octane was of course done as well:


      On pump fuel you will have lower detonation resistance and higher exhaust gas temps namely compared to ethanol.

      Now here is a very interesting overlay of the OEM turbos:


      Quote Originally Posted by KRATOS
      This Dyno Graph depicts the differences in power between the same BMW S55 engine on stock OEM turbos E30 Fuel Only with all modifications listed above without Fuel-It PI vs. KRAS55Bi on E85. There are other S55 that have made more power with stock turbos and stock fuel system, however this is the power that was made on the same vehicle which is why this data was used. Notice at 6900rpm there is a Difference of 327whp between the stock turbos and the KRAS55Bi. These figures are used for reference only, but they do give the end user an idea as to the difference of power that can be achieved when upgrading from a stock OEM turbo system on E30 to a KRAS55Bi on E85.
      The part to focus on is in bold. A difference of 327 whp on the top end is insane.

      Here is the final graph overlay on pump gas to hammer the point home:


      Quote Originally Posted by KRATOS
      This Dyno Graph depicts the differences in power between the same BMW S55 engine on stock OEM turbos 93 octane fuel only with all modifications listed above without Fuel-It PI vs. KRAS55Bi on 93 octane fuel only. Notice at 6900rpm there is a Difference of 200whp between the stock turbos and the KRAS55Bi. These figures are used for reference only, but they do give the end user an idea as to the difference of power that can be achieved when upgrading from a stock OEM turbo system on 93 octane fuel only, to a KRAS55Bi on 93 octane fuel only.
      KRATOS making the power they are on the stock internals is proof that early S55 failures in the ~700 whp FBO on range with hybrids were not due to the internals not being able to take the power. Some 'Instagram' tuners would ramp in torque hard way too early without paying attention to exhaust gas temps. They were after peak figures on a graph and not paying attention to how to best cater the tune to the setup.

      BimmerBoost agrees with KRATOS:

      Quote Originally Posted by KRATOS
      The introduction of the KRAS55Bi proves that early connecting rod failure on stock engines is more a result of high exhaust back pressure along with extreme torque demands rather than a pre-mature mechanical limit of the rotating assembly based on data from several high mileage 750+whp beta test vehicles . The shape of the dyno curves listed above are a visual representation of the KRATOS Engineering Teamís success at disproving this fact.
      Now you want to know, how much money and when? Well, expect the KRASS55Bi early next year:

      KRAS55Bi: $7,895, Early Q1 2019
      KRAS55Ti: $8,995, Late Q1 2019

      Keep in mind this is a complete turbo upgrade system including the inlets requiring no cores. BimmerBoost feels the product is priced very well for the quality and design. Keep in mind, this is an upgrade engineered by a company that does nothing but focus on complete turbo upgrades for each specific application. This is partially why this upgrade took so long to come to market. A very big difference between modifying OEM housings with off the shelf parts and creating new ground up manifolds and turbochargers with the highest quality components.

      Yes, there is also a KRASS55Ti turbo upgrade coming good for 1000+ whp which BimmerBoost will cover later in the week.

      Some details:

      • Forged Billet Ti6Al4v Titanium (Grade 5)
      • 3rd Order Geometry Design
      • Point Milled Manufacturing

      Quote Originally Posted by KRATOS
      This wheel is intended for use on built motor high output setups. Titaniumís higher tensile strength over that of aluminum allows for more aggressive design characteristics. The Titanium material is also great for road race or endurance racing applications where HCF (High Cycle Fatigue) can pose issues. More information and data results will be available as release of the KRAS55Ti approaches.

      Direct all inquiries to info@asrkratos.com

      PRESS RELEASE

      This article was originally published in forum thread: Global Motoring Group's KRATOS Brand releases 850+ whp capable KRAS55Bi F80 M3 & F82 M4 forged billet aluminum S55 turbo upgrade - Specs, dynos, pricing started by Sticky View original post
      Comments 24 Comments
      1. Imran@Evolve's Avatar
        Imran@Evolve -
        That looks like a great solution. Would be great to get a set on our shop car.
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        Click here to enlarge Originally Posted by Imran@Evolve Click here to enlarge
        That looks like a great solution. Would be great to get a set on our shop car.
        We appreciate the positive feedback! Send us an email to info@asrkratos.com and our staff can get you setup. Love the Verde Mantis Green M3 by the way!
      1. quattr0's Avatar
        quattr0 -
        Wow..that torque line on e85 is pertty. Doesn't take a deep dive after 5k rpm like the rest of the world. Congrats!!!
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        Wow..that torque line on e85 is pertty. Doesn't take a deep dive after 5k rpm like the rest of the world. Congrats!!!
        Click here to enlarge The goal of the stock engine tune was to actually dial down mid-range torque and horsepower a bit to mitigate undue stress to the connecting rods. The broad torque curve is a result of the turbo system's flow capability as well as extremely low backpressure as tested.
      1. Imran@Evolve's Avatar
        Imran@Evolve -
        Click here to enlarge Originally Posted by Sales@KRATOS Click here to enlarge
        We appreciate the positive feedback! Send us an email to info@asrkratos.com and our staff can get you setup. Love the Verde Mantis Green M3 by the way!
        Thanks! It is a very cool colour.

        I've sent an email - look forward to getting a response. :-)
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        Click here to enlarge Originally Posted by Imran@Evolve Click here to enlarge
        Thanks! It is a very cool colour.

        I've sent an email - look forward to getting a response. :-)
        Yes, your email was received and you will have a response shortly.
      1. quattr0's Avatar
        quattr0 -
        Click here to enlarge Originally Posted by Sales@KRATOS Click here to enlarge
        Click here to enlarge The goal of the stock engine tune was to actually dial down mid-range torque and horsepower a bit to mitigate undue stress to the connecting rods. The broad torque curve is a result of the turbo system's flow capability as well as extremely low backpressure as tested.
        I'm sad that you gents don't have any product for 991.2 Carrera :-( Never heard to have more choices for us!
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        I'm sad that you gents don't have any product for 991.2 Carrera :-( Never heard to have more choices for us!
        We actually have considered this platform for quite some time. However, the limitation of tuning capabilities and lack of tuning platforms at the time kept us from moving forward. Unfortunately, it's just not conducive to our business model to engineer, design, and manufacture a platform that does not have the capabilities to realize the maximum potential of what our turbo systems have the ability of producing. Although, it is still a platform we are still considering for the future.
      1. whoop_ass's Avatar
        whoop_ass -
        Brilliant, love the graph!!
        will get in touch with you soon for a set!

        these turbo flow and you can see it's not massive boost due to the torque.
        but they make the power uptop!!Click here to enlarge
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        Click here to enlarge Originally Posted by whoop_ass Click here to enlarge
        Brilliant, love the graph!!
        will get in touch with you soon for a set!

        these turbo flow and you can see it's not massive boost due to the torque.
        but they make the power uptop!!Click here to enlarge
        Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        I'm sad that you gents don't have any product for 991.2 Carrera :-( Never heard to have more choices for us!
        I have turbos sitting here waiting for whenever you're ready...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by whoop_ass Click here to enlarge
        Brilliant, love the graph!!
        will get in touch with you soon for a set!

        these turbo flow and you can see it's not massive boost due to the torque.
        but they make the power uptop!!Click here to enlarge
        Not enough is being said about them topping 800 whp on the stock internals.

        This upgrade is in a league of its own.
      1. quattr0's Avatar
        quattr0 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        I have turbos sitting here waiting for whenever you're ready...
        Waiting to see more users with Tial kit.. @TXGold doesn't have bigger turbos and he already has issue with trans slip so I'm a bit concerned also.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        Waiting to see more users with Tial kit.. @TXGold doesn't have bigger turbos and he already has issue with trans slip so I'm a bit concerned also.
        Separate issue for a separate thread but all turbo upgraded cars aren't having trans issues...
      1. Sticky's Avatar
        Sticky -
        PRESS RELEASE link in article has proper PDF link now.
      1. HeadgamesDave's Avatar
        HeadgamesDave -
        great write up! Looking forward to results!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by HeadgamesDave Click here to enlarge
        great write up! Looking forward to results!
        Game changing.
      1. marconi118's Avatar
        marconi118 -
        at 3000 rpm on pump gas the stock turbos produce 200lbs/ft more torque....

        would it be possible to improve this without impacting reliability of stock motor internals?
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        Click here to enlarge Originally Posted by marconi118 Click here to enlarge
        at 3000 rpm on pump gas the stock turbos produce 200lbs/ft more torque....

        would it be possible to improve this without impacting reliability of stock motor internals?
        Yes, it's definitely possible to increase torque in that area of the powerband while still maintaining reliability of the stock connecting rods. However, it was a decision that was decided against as the beta test vehicles were experiencing extreme tire spin early in third gear on those higher torque 93 octane maps even with Toyo R888R tires installed. Too much torque too soon is not always a good thing as this can make the vehicle spin violently making it unbalanced and difficult to put to the power to the ground.

        The KRAS55Bi was never designed to have the same spool characteristics as stock or small frame turbos, as the idea was to create a more balanced power delivery. To do so we developed a system with significantly higher adiabatic efficiency than any other OE style twin turbo upgrade on the market, while at the same time utilizing our Dual Ceramic BB Technology to effectively negate the slower transient response time of larger frame turbos.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by marconi118 Click here to enlarge
        at 3000 rpm on pump gas the stock turbos produce 200lbs/ft more torque....

        would it be possible to improve this without impacting reliability of stock motor internals?
        This is where the quality of the tuning comes into play.

        Most tuners give you that torque at 3000 rpm. Most motors won't last with the torque these turbos are capable of ramping in that early...