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Comprehensive MSS54/MSS54HP DME Information

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    #46
    Is there a disassembly publically available with the maps and routines already defined? I'm thinking about starting something like this, so that additional function could be implemented or disabled.

    For example, the flash counter could propably be disabled when skipping/modifiying the funcrtion that does the lookup or write.

    I know C167 quite well, but from what Ive learned with MS45 and ME9, MPC is not that complicated to work with, because it has a better decompilation implement in IDA or Ghidra.

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      #47
      Originally posted by sda2 View Post
      Is there a disassembly publically available with the maps and routines already defined? I'm thinking about starting something like this, so that additional function could be implemented or disabled.

      For example, the flash counter could propably be disabled when skipping/modifiying the funcrtion that does the lookup or write.

      I know C167 quite well, but from what Ive learned with MS45 and ME9, MPC is not that complicated to work with, because it has a better decompilation implement in IDA or Ghidra.
      I dont know such a thing, I want also to start with this process, tools are available but i failed finding a good starting point..

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        #48
        To anyone tracking their DME information:

        Anyone has this hardware number MSS54HP variant? If so, then what model year is the car?


        DME/ECU Type: MSS54HP
        DME Version: 211323002701-J469
        Transmission Type: 6 Speed Manual
        Chassis: E46
        Hardware Number: 7842981


        Thanks.

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          #49


          I wonder how it got there








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            #51
            Originally posted by sapote View Post
            My understand is the MSS54 vs MSS54HP only difference is the flash PROM chips, 256KB vs 512KB. So to convert the MSS54 board to MSS54HP, one needs to remove the 2 chips (512KB) from a S54HP then read and save the files using something like the chip programmer below, then program the files into the two new chips (512K), i.e. AM29F400BB-60SC
            from https://www.mouser.com/ProductDetail...W34bxMGA%3D%3D
            then solder the new programmed chips back to the S54 DME board and now it become a S54HP DME.
            Have anyone done this before?
            I have a line on an MSS54 but need an MSS54HP. Before I bite the bullet I need to know for sure this conversion is as easy as stated above. Can anyone confirm that this information is correct? Just replace the PROM chips?

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              #52
              Originally posted by cek View Post

              I have a line on an MSS54 but need an MSS54HP. Before I bite the bullet I need to know for sure this conversion is as easy as stated above. Can anyone confirm that this information is correct? Just replace the PROM chips?
              There's also some resistors: https://nam3forum.com/forums/forum/s...=2582#post2582

              ​​​​​​The pressure sensor is different too, so you either have to scale it differently in software or swap out the hardware.
              2002 Topasblau M3 - Coupe - 6MT - Karbonius CSL Airbox - MSS54HP Conversion - Kassel MAP - SSV1 - HJS - PCS Tune - Beisan - MK60 Swap - ZCP Rack - Nogaros - AutoSolutions - 996 Brembos - Slon - CMP - VinceBar - Koni - Eibach - BlueBus - Journal

              2012 Alpinweiss 128i - Coupe - 6AT - Slicktop - Manual Seats - Daily - Journal

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                #53
                Hi guys,
                I am trying to code out the SAP on my E46 M3, is there a write-up anywhere that can be followed on a step-by-step basis? Also, does anyone know what the code needs to be changed to so the system is no longer searching for it? I couldn't find it in the tables...

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                  #54
                  I am having a hard time understanding the maps shown in the first post on this thread. One of the first steps of EFI tuning is to calibrate the volumetric efficiency table (for example, when fitting a CSL airbox or more aggressive camshafts, it increases the VE and the air-fuel ratio gets too lean, and a VE table calibration can remedy this) anyone knows how pro tuners do this on our MSS54/HP ??

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                    #55
                    Just wanted to say: THANK YOU! I was able to do something (simple) and fix my sport mode memory (which was set to always on) with the help of this thread and multiple others. Really appreciate the work of the community in creating and documenting these resources, all in their spare time. They are invaluable; and I learned a lot in the process.

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                      #56
                      Originally posted by E46m3zcp View Post
                      I am having a hard time understanding the maps shown in the first post on this thread. One of the first steps of EFI tuning is to calibrate the volumetric efficiency table (for example, when fitting a CSL airbox or more aggressive camshafts, it increases the VE and the air-fuel ratio gets too lean, and a VE table calibration can remedy this) anyone knows how pro tuners do this on our MSS54/HP ??
                      Non CSL software uses the MAF to essentially 'directly' measure airflow. The CSL runs primarily alpha N with some sort of compensation from the MAP sensor on the air rail. I'd imagine the pulsations in the MAP rail require significant filtering due to the small volume of the rail and proximity to the ports, so it cannot be used as the primary air charge estimation method. The main alpha-N VE table is KF_RF_N_AQ_REL, which is a function of engine speed and relative throttle opening.

                      KF = map
                      RF = relative filling
                      N = engine speed
                      AQ_REL = relative cross sectional opening​

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                        #57
                        Originally posted by sda2 View Post
                        Wow, this document seems to be a detail DME control software block diagram and theory! All we need is the "C" source code.
                        Or have anyone used a compiler or assemble to convert the binary file to 68376 assembly codes? C source is perfect but I am happy to work with assembly codes.

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                          #58
                          Originally posted by heinzboehmer View Post

                          There's also some resistors: https://nam3forum.com/forums/forum/s...=2582#post2582

                          ​​​​​​The pressure sensor is different too, so you either have to scale it differently in software or swap out the hardware.
                          The ambient pressure sensor is used only for CSL as the DME needs to interpret the MAP sensor in the CSL intake, and so for non-CSL I don't think it's matter. No?

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