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    • 9-Second BMS JB4 tuned F90 BMW M5 on factory S63TU2 turbochargers - 9.89@138.74 1/4 mile, 60-130 6.03

      Man is this M5 moving! The F90 M5 platform is stout and all wheel drive certainly helps put the power down. That is evidenced by the 9-second elapsed time and it is hard to argue against the xDrive all wheel drive system when S63 4.4 TT V8's are putting out so much torque tuned.


      The M5 is more of a straightline beast these days but how do you argue with these numbers?




      Yes, GPS numbers but the quickest and fastest recorded by an F90 M5 using GPS thus far.

      Highly impressive results.

      Mods:
      BMS JB4
      Back end flash
      Weistec water-meth injection system
      E30
      GruppeM CAI
      Remus Exhaust
      Keller Performance Downpipes

      This article was originally published in forum thread: 9-Second BMS JB4 tuned F90 BMW M5 on factory S63TU2 turbochargers - 9.89@138.74 1/4 mile, 60-130 6.03 started by Sticky View original post
      Comments 18 Comments
      1. Stevenh's Avatar
        Stevenh -
        Wow, that is f'ing moving for stock turbos.
      1. blaster3500's Avatar
        blaster3500 -
        That is amazing! A few bolt on's and you have a big 4 door running 9s
      1. vrsixxxxxx's Avatar
        vrsixxxxxx -
        Damn that's moving.
      1. 135idct's Avatar
        135idct -
        why u don't want to mention DME tuning?
      1. Sticky2's Avatar
        Sticky2 -
        Click here to enlarge Originally Posted by 135idct Click here to enlarge
        why u don't want to mention DME tuning?
        This isn't a charity.
      1. 5soko's Avatar
        5soko -
        I wonder if anything was done in the tcu side of things, i know this trans have to have a TQ limit like its smaller sibling ZF trans...
      1. Eleventeen's Avatar
        Eleventeen -
        Click here to enlarge Originally Posted by 5soko Click here to enlarge
        I wonder if anything was done in the tcu side of things, i know this trans have to have a TQ limit like its smaller sibling ZF trans...
        The JB4 likely hides the extra tourque from the DME / TCU. Itís reporting lower than actual boost, skewing load calculations downward.
      1. 5soko's Avatar
        5soko -
        Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
        The JB4 likely hides the extra tourque from the DME / TCU. Itís reporting lower than actual boost, skewing load calculations downward.
        Exactly what im thinking.
        Since the JB4 wont register true load in the ecu, the trans will be running stock line pressure and tq limits. I would imagine if the trans isn't slipping, its is causing alot of small slippage since its running stock line pressure.
        Even with a backend flash, if they reported true load and tq to the tcu, line pressure would be alot better, but power would get cut off early via the tcu tq limits. And if they over reported TQ to max out or increase line pressure, tq limits would take away the fun.

        Be interesting to hear what they are doing and if the TCU has been modified or if they ran into any TCU tq limits.
      1. maxnix's Avatar
        maxnix -
        Funny people think reporting delayed false loads to the DME is somehow beneficial tuning.

        Also note lack of additional ATF cooling. This is like a Tesla in that a few rapid runs in a short time will severely compromise this car's performance.

        One hiccup from the water/methanol system and things will start to melt internally.
      1. 5soko's Avatar
        5soko -
        Click here to enlarge Originally Posted by maxnix Click here to enlarge
        Funny people think reporting delayed false loads to the DME is somehow beneficial tuning.

        Also note lack of additional ATF cooling. This is like a Tesla in that a few rapid runs in a short time will severely compromise this car's performance.

        One hiccup from the water/methanol system and things will start to melt internally.
        Yup, Beneficial tuning to the tuners who don't have access to the TCU and but need to get around the tq limits
      1. Eleventeen's Avatar
        Eleventeen -
        Click here to enlarge Originally Posted by 5soko Click here to enlarge
        Yup, Beneficial tuning to the tuners who don't have access to the TCU and but need to get around the tq limits
        Has anyone released software to tune this transmission yet?
      1. 5soko's Avatar
        5soko -
        Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
        Has anyone released software to tune this transmission yet?
        i believe HCP had something in the works, not sure.
        I know there are tunes for every other ZF auto trans out in the bmw world.
      1. Weistec's Avatar
        Weistec -
        Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
        The JB4 likely hides the extra tourque from the DME / TCU. Itís reporting lower than actual boost, skewing load calculations downward.
        For this car, the JB4 is running on Map 0 and is functioning only as a water/meth controller and fail safe as well as a means to datalog the car.

        If there is a flow problem with the meth, the JB4 will put the car into Map 4 (limp/safety mode)

        ECU tune is a full tune from DME
        TCU tune is stock
      1. 5soko's Avatar
        5soko -
        Click here to enlarge Originally Posted by Weistec Click here to enlarge
        For this car, the JB4 is running on Map 0 and is functioning only as a water/meth controller and fail safe as well as a means to datalog the car.

        If there is a flow problem with the meth, the JB4 will put the car into Map 4 (limp/safety mode)

        ECU tune is a full tune from DME
        TCU tune is stock
        Running the factory TCU tq limits, they must be under-reporting tq in the ecu that the tcu is reading?
      1. Weistec's Avatar
        Weistec -
        Click here to enlarge Originally Posted by 5soko Click here to enlarge
        Running the factory TCU tq limits, they must be under-reporting tq in the ecu that the tcu is reading?
        The torque limits in the TCU are pretty high stock.

        From experience on a pre 2020 F90, tuning the TCU to increase its torque limits actually makes for traction issues when launching or at very low speeds. When TCU tunes become more common for these cars, you're going to start seeing a lot of broken differentials and axles.
      1. E92 420's Avatar
        E92 420 -
        So this car isn’t jb4 tuned at all like the title states it is!!!

        It’s a DME tuning remap
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by E92 420 Click here to enlarge
        So this car isn’t jb4 tuned at all like the title states it is!!!

        It’s a DME tuning remap
        The JB4 is serving an important function in the tuning recipe and it is mentioned the car has a flash tune.
      1. cj2's Avatar
        cj2 -
        Curious what tire setup was used during this run.