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    • KRATOS KRAS55Bi F80 M5 S55 turbo upgrade road test at 22 PSI or the argument for AWD M3's

      The problem facing BMW F80 M3 and F82 M4 tuning today is no longer the S55 ECU or the crank hub. It is traction. As you know KRATOS raised the bar to whole new level with their 1150 rear wheel horsepower KRAS55Bi dyno pull setting multiple records in the process.


      Well what is that level of power like in the real world? Truthfully, it's scary. People do not realize just how much horsepower it really is. Taming over a thousand horses with RWD is no small feat.

      The video below shows the KRATOS F80 M3 at 22 psi which means power is turned down to roughly ~750 rear wheel horsepower. You would not want to be in the car with an inexperienced driver around those palm trees.

      If the car is sliding around at 750 just imagine another ~600 rwhp on top of that. This level of power is not something to take lightly. It is something to respect and if fully unleashing the turbos hopefully you have a prepped 1/2 mile in front of you and some soft rubber.

      As M evolved to be more about power than driving dynamics today it is no wonder all wheel drive is finding its way onto the M3.

      Quote Originally Posted by 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.

      This article was originally published in forum thread: KRATOS KRAS55Bi F80 M5 S55 turbo upgrade road test at 22 PSI or the argument for AWD M3's started by Sticky View original post
      Comments 21 Comments
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        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.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Sales@KRATOS Click here to enlarge
        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.
        If you want to display an image on the article page you need to embed inline:

        Click here to enlarge
      1. Payam@BMS's Avatar
        Payam@BMS -
        Pretty normal on the S55, they're notorious for not getting any traction in any gear.

        I have NT01 on my 18's and still spin 3rd gear on stock turbos. They will need to do some rear brake conversions for smaller wheel setup IMO.
      1. quattr0's Avatar
        quattr0 -
        ^^^^ What he said. Still remember my F82 spun in 3rd especially when turning left and hit it.

        I do hope they already have prototype for F90 upgrade ;-)
      1. maxnix's Avatar
        maxnix -
        Seems like a tune to limit torque per gear ratio is required.
      1. smiff's Avatar
        smiff -
        Dude had one hand on the steering wheel.
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by smiff Click here to enlarge
        Dude had one hand on the steering wheel.
        The other hand was on his massive balls.
      1. Blown6's Avatar
        Blown6 -
        If you are spinning the 4S all the way into 4th, there is no way R888s will tame it....
      1. Sales@KRATOS's Avatar
        Sales@KRATOS -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        ^^^^ What he said. Still remember my F82 spun in 3rd especially when turning left and hit it.

        I do hope they already have prototype for F90 upgrade ;-)
        Engineering already in prototype phase for F90 M5! Click here to enlarge
      1. smiff's Avatar
        smiff -
        Click here to enlarge Originally Posted by Sticky2 Click here to enlarge
        The other hand was on his massive balls.
        Lol
      1. newb335guy's Avatar
        newb335guy -
        If you do not want to spin in 3rd gear or above on the street you will need to daily a drag radial, 1st and 2nd will still be useless, and 3rd may spin at times depending on road.

        I ran with NTO5r as a daily in my old N54 that I ran 10s in regularly at the track it was the only way to really enjoy car as a daily and feel somewhat in control. the NT05r s did well as a daily just do not get caught in heavy rain or you will have to drive at a crawl and get off the interstate. I always drove my truck if i thought it was going to rain or put on other set of wheels if i was taking it on a trip.
      1. Bowser330's Avatar
        Bowser330 -
        Its amazing what they have been able to do with the S55 motor.

        And seeing how the F90 performs with M-xdrive, An upgraded G80 AWD M3 that weighs 500lbs less will be a destroyer.
      1. quattr0's Avatar
        quattr0 -
        But no one will admit it takes an ex-Audi boss to make future BMW brighter lol
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by maxnix Click here to enlarge
        Seems like a tune to limit torque per gear ratio is required.
        That is exactly what they are working on and what @lfelunden supposedly can do...

        Syvecs can do this but it isn't available for the S55 yet.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by newb335guy Click here to enlarge
        If you do not want to spin in 3rd gear or above on the street you will need to daily a drag radial, 1st and 2nd will still be useless, and 3rd may spin at times depending on road.

        I ran with NTO5r as a daily in my old N54 that I ran 10s in regularly at the track it was the only way to really enjoy car as a daily and feel somewhat in control. the NT05r s did well as a daily just do not get caught in heavy rain or you will have to drive at a crawl and get off the interstate. I always drove my truck if i thought it was going to rain or put on other set of wheels if i was taking it on a trip.
        I'm on Mickey Thompsons on my Porsche and do not spin even WOT from 1st but will be going to an R888R because the drag radials certainly don't inspire handling confidence.
      1. Bowser330's Avatar
        Bowser330 -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        But no one will admit it takes an ex-Audi boss to make future BMW brighter lol
        M-xdrive was invented by an ex-audi boss?
      1. quattr0's Avatar
        quattr0 -
        No but wasn't his idea to have M5 and soon M3 with xdrive? Thought I read it somewhere...
      1. Bowser330's Avatar
        Bowser330 -
        Click here to enlarge Originally Posted by quattr0 Click here to enlarge
        No but wasn't his idea to have M5 and soon M3 with xdrive? Thought I read it somewhere...
        I'd read that article, please link

        If it was his idea then he's a smart man.

        I dont hear many people complaining about how the F90 M5 feels and I expect them to feel the same about the G80 M3. With the amount of power and torque coming out of these cars, AWD makes WOT less dangerous and MUCH quicker
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Bowser330 Click here to enlarge
        I dont hear many people complaining about how the F90 M5 feels and I expect them to feel the same about the G80 M3. With the amount of power and torque coming out of these cars, AWD makes WOT less dangerous and MUCH quicker
        Without a DCT I just don't see how they will feel as interactive though. The automatic is a step back IMO.

        DCT + AWD fine.
      1. SpeedLimit?'s Avatar
        SpeedLimit? -
        Was that an M3 or a Surpa?