CSL '0401' Program Binary Disassembly Notes

[karter16]

Here's mzyl_berech(). This is what I'd previously identified as m_calc(). I'm not 100% sure that the function/parameter/variable names that I've pulled through from MSS65 are what BMW ACTUALLY used in the MSS54 code. I think it's more likely that PSAU is p_saug for example, in line with the way other pressure and temp variables were named in the MSS54. I think too that MZYL was possibly just M, etc. but I'm definitely going to opt for known actual names over made up names, so have pulled through the MSS65 naming where there wasn't already a 100% known name from MSS54. ? at the end of a variable name represent where I don't have a definitive name, not necessarily that I have any uncertainty about what it is/does.

[terra]

Yeah hard to say for sure. I also have a suspicion that the some of the CSL stuff was borrowed from the MSS6x project given the development timelines, but the two projects very well could have had different naming conventions. Though a lot of names are shared, so it might just be their convention is a little more fluid and it more came down to whichever engineer started writing the code.

As far as m vs mzyl -- I think they probably would have noted that the value is a per cylinder calculation in the naming scheme, though perhaps m_zyl would have been the convention on the MSS5x

Sure would be nice if we could get access to some MSS54 ELFs

[karter16]

Sure would be nice if we could get access to some MSS54 ELFs

I have this horrible nagging feeling that one day I'm going to declare my efforts "complete" and the next day someone will be like "oh btw, here's the source code for the CSL" lol. There's definitely a couple of people out there who have more CSL-specific info.

[bmwfnatic]

I have this horrible nagging feeling that one day I'm going to declare my efforts "complete" and the next day someone will be like "oh btw, here's the source code for the CSL" lol. There's definitely a couple of people out there who have more CSL-specific info.

This will 100% happen one day, we know it's out there, and people love to gate keep until there's no point anymore.

[terra]

This will 100% happen one day, we know it's out there, and people love to gate keep until there's no point anymore.

Yeah, there's clearly more out there than is publicly available. Though I would argue the MSS5x are understood well enough for there already to be no point in hoarding files - most tuners are doing little more than editing the main ignition and fueling tables.

I do wonder if BMW gives some definitions on the motorsport side of things since I imagine those cars are recalibrated pretty often. Though I don't know if I've ever seen an MSS54 in the motorsports parts listing (MSS60 yes though)

[bmwfnatic]

Yeah, there's clearly more out there than is publicly available. Though I would argue the MSS5x are understood well enough for there already to be no point in hoarding files - most tuners are doing little more than editing the main ignition and fueling tables.

I do wonder if BMW gives some definitions on the motorsport side of things since I imagine those cars are recalibrated pretty often. Though I don't know if I've ever seen an MSS54 in the motorsports parts listing (MSS60 yes though)

It mentions ECU 406 and ECU 400 and a separate VANOS ECU in the P54B32 catalog, nothing explicitly about the MSS indeed.