KRATOS KRAS55Bi Turbos Surpass 1150WHP

[Sales@KRATOS]

KRAS55Bi Turbos Surpass 1150WHP

It's with great pleasure that we at Global Motoring Group share the latest results of our KRATOS KRAS55Bi Turbo System.

As many of you may know, within a week of completing an engine build on one of our developmental S55's we were able to put down preliminary dyno results of 975whp and 752wtq @ 35psi on pump E85. As the turbos clearly had much more left in them combined with the fact that the 35psi run is very close to the limit of the factory map sensor, we decided to move forward with installing a 4 bar map sensor that would enable us to dial in additional boost. Moreover, being that the KRAS55 line of turbo systems will begin their public release this month, we wanted to update those who have been following our recent developments.

We reached out to Burger Motorsports as they had a Bosch 4 bar sensor upgrade kit that would work for the application. Unfortunately, their kit was not made for S55's, but with the help of Terry & Payam they were able to put a custom PnP harness together for us in only one day and promptly shipped it to us. Once installed, Halim@HCP rescaled the map sensor to prepare the car for further testing of the KRAS55Bi turbos. With the car dialed in on a HCP custom tune @ 41psi and Ignite E85 fuel (E83 Via Fuel-It Sensor) with an ambient temperature of 77°F our KRAS55Bi's produced the following results listed below.

List Of Modifications:

• Built Engine Stock Bore/Compression (CP Pistons/Carrillo Rods)
• Headgames Motorworks Cylinder Head (Please Contact Headgames For Details)
• ASR Engineering Intercooler
• ASR Engineering Heat Exchanger
• Intakes
• Catless Downpipes
• Dodson Sportsman Plus DCT Clutch Kit
• Fuel-It PI
• Stock Intake Manifold
• BMS 4 Bar MAP Sensor Kit
• Maximum PSI Crank Hub Kit
• BootMod3
• HCP 4 Bar Custom Tune
• KRAS55Bi Turbo System (Standard Billet Wheel Option)
• Ignite E85 (83% Via Fuel-It Sensor)
• Motul Sport Esther Oil

While the KRAS55Bi turbo system does produce a stratospheric 1150whp and 985wtq, it is important to note that this S55 is still one of the most civil and docile daily drivers you will ever come across. The KRATOS brand has maintained focus on never sacrificing drivability and reliability for the sake of power output. KRATOS offers peak power beyond large single turbos with OEM twin turbo drivability and increased reliability. As we stated in our previous press release and have now further proven, "The notion that custom large single or large twin turbos are required to produce high output figures is now moot point."

Availability:

KRAS55Bi’s will be shipping THIS MONTH!

Pre-orders:

Pre-orders will consist of a $500 refundable deposit meant to signal intent of purchase. Please contact a representative at info@asrkratos.com for more information regarding pre-ordering a KRAS55Bi system.

[bracer]

Holy hell. Good job guys. That's an incredible amount of power and boost!

[chetrickerman]

Simply amazing!

Your TI turbos are going to be even crazier!

[katzndogs]

Great work, guys!

[KMORGSM5]

Good work guys! Impressive numbers.

[Sales@KRATOS]

Originally Posted by Railgun

That's a helluva power falloff to redline.

There are several factors that contribute to the loss of power and torque passed the 6300rpm mark. Keep in mind the car is still producing 1050whp at the drop off and maintaining it to redline.

The first thing that has to be considered is that the engine was designed in such a way that it's meant to be most efficient within a specific rpm range. This basically means that the valve timing and camshaft profiles are part of an equation that allows the engine to perform and breath it's best within that rpm range. Another thing to consider is that as the RPM increases, it gets harder to get the optimal amount of air and fuel into the cylinder and burn it at an optimal rate. The faster the engine revs, the less time there is to induce, compress, burn, and exduce. This in turn affects your ignition timing, which means you start the burn process earlier than what's ideal so the flame dies just before the exhaust valve opens. Unfortunately, there is no way to install an aftermarket camshaft on the intake side due to the valvetronic and currently there are no exhaust cam options.

Another thing to consider is the flow capabilities of the turbo system. At our peak output of 1150whp our max boost duty cycle is 94% which produces 41psi. The turbos are able to maintain 41psi all the way to the rev limiter. We also measure the shaft speed of our beta systems with custom shaft speed sensors installed on the compressor covers. This tells us the shaft speed the turbos were designed to operate within. If we go above that shaft speed, the turbos will create more heat per pound of boost and be less efficient which is what we do not want. According to our data, we are close to the upper limit of shaft speed we would like to stay within which means the drop is not related to compressor. That leaves us with the turbine wheels which were designed to support just above 1200whp as a pair.

Taking all this information into account we feel it's a combination of limitations between the two. Flow capabilities being reached sooner as a result of camshaft lift and duration limitations.

[proTUNING Freaks]

[Sales@KRATOS]

Originally Posted by Railgun

I read that as the turbos running out of breath. But there's a compromise as you say to the end goal. This is why I'd asked for a comp map previously.

Either way, nice to see what this platform, albeit built up, can do.

Now the question is, how usable is it?

Actually, you seem to have interpreted the information incorrectly. If the turbos were running out of breath we would have clearly seen that through the speed sensor which we did not. Also, boost would not remain consistent and begin to drop off as a sign of running out of compressor flow.

Many people may not be familiar with the valvetronic system's limitations as it relates to valve spring pressure. We spent approximately 6 months working with Headgames so they could develop a valve spring with enough spring pressure to negate valve float as much as possible while still being able to maintain the functionality of the valvetronic system. If the valve spring pressure is too high the valvetronic system will not function properly and the throttle simply won't open. That being said, could we use more spring pressure? Of course, but it would be at the expense of potentially running into valvetronic and throttle issues. In short, Headgames was able to develop a valve spring that was a great compromise that helped overcome these obstacles. However, we may be at a mechanical limit that there currently is no solution for. Only time will tell with more R&D testing.

As far as how usable the power is would all be dependent on your drivetrain upgrades and wheel/tire combination you're running. As far as normal partial throttle driving the car drives completely docile just like a stock M3 which is one of the best aspects about the turbo system. However, under WOT that is a different story. Without any sort of boost reduction even at 22psi (748whp) from a roll in 2nd gear with 2 people in the car on Michelin Pilot 4S's it spins all of 2nd and all of 3rd gear without any signs of traction early in 4th before we let off. So, basically you will need either R888R's or some sort of drag radial if you plan on running the car without boost reduction. We'll post an in car video shortly at 22psi on the same Michelin Pilot 4s's without boost reduction so everyone can get a chance to see the behavior of the car on street tires.

[coldsteelrain]

Wow that is insane power
Good job and well done

[FriedPiston]

Congrats Sales@KRATOS! This has got to be a world record for highest power output out of an S55!

[chetrickerman]

Originally Posted by nars3000

Congrats Sales@KRATOS! This has got to be a world record for highest power output out of an S55!

It is

[chewbakam4]

OMG! This is just bonkers!! Congratulations everyone involved!

[M3SQRD]

Congrats. Awesome set of turbos you’ve developed

[DeividF80M3]

If the objective is the S55 with the maximum power, congratulations!
If the objetive is to make a turbo kit to tune the S55, I'm sorry, but I do not like the power graph. Almost 1500rpm of decreasing power to the red line.

[Sales@KRATOS]

Originally Posted by DeividF80M3

If the objective is the S55 with the maximum power, congratulations!
If the objetive is to make a turbo kit to tune the S55, I'm sorry, but I do not like the power graph. Almost 1500rpm of decreasing power to the red line.

As stated in earlier posts the power drop is a more of a mechanical limit of camshafts and valve spring pressure more so than it is a mechanical limit of the turbo system as boost remains constant and stays within shaft speed requirements. Even though, our cylinder head has upgraded valve springs there is still a limit as to how much spring pressure can be used due to the valvetronic system.

As far as tunability for the S55 system is concerned, there are no hybrid stock turbos or custom single/twins that produce as much power or as broad a torque or powerband as the KRAS55Bi.

[Machtavian]

Are you guys planning any real-world testing? I'd love to see how it does in a 1/4 mile and or 1/2 mile run!

[Sales@KRATOS]

Originally Posted by Machtavian

Are you guys planning any real-world testing? I'd love to see how it does in a 1/4 mile and or 1/2 mile run!

As a matter of fact we tried 60-130 Draggy logs with the 975whp tune, but did not go so well due to severe wheel spin even with 305/30/19 Toyo R888R's on the stock wheels. This is why we had custom 18" Belak beadlock wheels made to fit a 305/35/18 Toyo R888R. We have a private track rental already scheduled, but aren't planning on doing hard 1/4 mile passes since we won't have axles or driveshaft installed in time. The purpose of the track rental is to log good 60-130 times as well as get a good idea as to the trap speed the car is capable of achieving. We are also registered for the Wannagofast 1/2 mile event in Ocala on April 13th & 14th. Once we have solid data we will be publishing it immediately thereafter.

[FriedPiston]

Originally Posted by Sales@KRATOS

As a matter of fact we tried 60-130 Draggy logs with the 975whp tune, but did not go so well due to severe wheel spin even with 305/30/19 Toyo R888R's on the stock wheels. This is why we had custom 18" Belak beadlock wheels made to fit a 305/35/18 Toyo R888R. We have a private track rental already scheduled, but aren't planning on doing hard 1/4 mile passes since we won't have axles or driveshaft installed in time.

I have close to a hundred 1/4 mile passes over the last 14-16 months with various wheel/tire combinations along the way. I can tell you from experience that 305/35/18 R888R will not hold for a dig start. I'd recommend 305/40/18 MT ET Street S/S at bare minimum for anything over 600whp.

Although, rolling start would be a different story, and the R888Rs will work just fine for that.

[Sales@KRATOS]

Originally Posted by nars3000

I have close to a hundred 1/4 mile passes over the last 14-16 months with various wheel/tire combinations along the way. I can tell you from experience that 305/35/18 R888R will not hold for a dig start. I'd recommend 305/40/18 MT ET Street S/S at bare minimum for anything over 600whp.

Although, rolling start would be a different story, and the R888Rs will work just fine for that.

Since the car won't have driveshaft or axles before the track rental we purposely chose to run the R888R's rather than the MT ET Streets. Our plan is not to run the car hard from a dig to save the stock drivetrain. The sole purpose of the private track rental is to collect 60-130 data as well as 1/4 mile trap speed capabilities. The car was never built with the intent to drag race, but more so for beta testing and 1/2 mile racing. To be honest we'd rather leave that to the guys who purpose built their cars for the 1/4 mile. There will be plenty of them out there very soon with KRAS55Bi's installed!

[whoop_ass]

Well done to all involved I think this is a massive feat as they essentially stock location turbos.
This essentially has made more power than the single turbo RK Tunes which is so far from been a bolt on kit
also factor in that it will drive like stock
Yes there is power drop at the top end but damn it still producing over 1000whp at 7.5k
and you can clearly see it's a limitation of the engine not been able to consume the air and move it through the cylinders fast enough, as the previous 975 whp had the peak power at the top end,

time to break out that credit card and order a set!!!

[AYF80]

Is it me, or does the motor sound much better with the new manifold / turbo set up.

[Sales@KRATOS]

As part of the discussion in our 1150whp press release, we discussed how usable the powerband is and how it would all be dependent on your drivetrain upgrades and wheel/tire combination you're running. As far as normal partial throttle driving, the car drives completely docile just like a stock M3 which is one of the best aspects about the turbo system. However, under WOT that is a different story. Without any sort of boost reduction even at 22psi (748whp/657wtq Built Engine) from a roll in 2nd gear with 2 people in the car on Michelin Pilot 4S's, it spins all of 2nd and all of 3rd gear without any signs of traction early in 4th before throttle is lifted. This is a prime example as to why KRAS55Bi owners will need either R888R's or some sort of drag radial if they plan on running the car without boost reduction on the street or strip. Attached below is a sample video of this run in Mexico to show how much of a handful the car can actually be on street tires without boost reduction at only 22psi.

Note: Sport Display has been modified to reflect 960 Horsepower / 800 Torque. Not that they are very accurate, but we figured it was still worth mentioning.