Hello everybody!

As the title says, I'm trying to develop a guide to understand and modify this POS, complicated as heck and that has information all over the place and not very verified. My intention is to have all of the information possible, verified, and giving credits to the people that have contributed to do so. So noobs like me and future generations can still make their own mods.

After seeing most tuning businesses nowadays will only copy-paste stuff for a typical stage 1, I decided I did not want to spend the 600€ on someting I could tackle myself (and do better) with a bit of time. I've been wandering through this forum and others, reading very useful information, from what seems very interesting and experienced people, and a few months ago I decided to start this small project to try to clarify everthing involved in modifying this ecu, document my process and give something back to the community down the road: a comprehensive, useful guide where to find all (or as much as possible) information in just one place and verified as much as we can.

DISCLAIMER: besides my best efforts to try to understand and provide good information about this ecu, I take no responsability of the damages that may occur to you ecu, car, whatever item of yours with the usage of this info, procedures, etc... Every case is very unique and be concious that what may apply to most of us, may not apply to your case. So verify and re-check everything, and act responsibly and accordingly.

SO: I've started this excel file with several pages where information will be classified. I STRONGLY SUGGEST all the information being donated to this file, to be posted so I can personally review it, test it, and update the file with it and credit the people involved, so we have ONLY ONE TRUSTED FILE, the one in this OP.

Excel pages will classify info for:
-Maps & general info
-Pictures (related to Maps)
-M3.8.X operation
-Stage 1
-Fuel
-Boost
-Ignition
-Big Stuff
-RPM limiter
-Pops - Bangs

If you consider sections must be modified, added, deleted, etc... please let me know and I will consider. I invite you to edit the file and make your on personal too, so you can organise yourself and document your very own ecus. This excel is developed on a good known DAMOS a german tuning company gave for free to me as these files were no longer profitable for them. Ecu and software numbers are 8D0907558E - 0261204805, files also updated with the excel file.

UPDATES:

v0.1 - 20/7/2022
The following pages and the information in it need to be completed and verified, in order to have a good startpoint to understand how the ecu works, what map is and does what, how to look for stuff...:

-Maps & Info
-Pictures
-M3.8.X Operation
-Stage 1 maps

v0.3 - 28/2/2023

Verified information:

- Pictures
- Logging
- Stage 1 (map list)
- Fuel (injector DC calculator, AFR ratios list)

Added: "Welcome" section with info about this file, ecu and tuning tools required for M3.8.x ecus. "Logging" section with Groups, Parameters and Values able to be logged (with 558E ecu and most Euro cars) so we can identify quickly logging groups and what info to expect before going into the car or what info we should look at in our logs.


I would like to thank everybody in advance, who contribute, who just come here for information, who try stuff in their cars... as everything helps here.

Nothing to add..but excellent work mate. I have searched high and low and this is the best info.

Hi, thank you ZpiXDK for having a look at the file. I've typed in the corrections you made, will upload it tomorrow.

I have a wideband and boost sensor already at home and waiting to be installed soon, although thank you for the advice.

My latest concerns with understanding this ecu are these two, I will be very appreciated if you can provide some input about how they work:


- How does KFLDS and LDSMXN interact to manage boost? Isn't KFLDTV supposed to control boost by N75 duty cycles? I still don't get how or why does ms/umdr (load) translate to boost.

- If KFLF is a correction map for the injection times, are KFLTLWS and KFLFAV the base maps for KFLF to correct from? In other words, the base maps for injection?


This ECU is a pain in the ass but I'll get it to work. Thank you very much in advance!

Hi ZpiXDK,

Thank you very much for your explanations. I did read the audi-sport page you pasted but some of your explications have thrown in some light.

- From what I have deducted, am I correct if I affirm that the PID maps are what convert load to boost by modulating the DCs in KFLDTV? (asking because of these formulas/units I've seen in the map properties, see attached below in the blue circles):



- And, with no disrispect intended about your explanations, but are you sure LDSMXN is the map responible to flag overboost? From what I had read in several places is a load limiter and the map that flags overboost is the 6x6 KHFMLDMX map, where says max airflow at a given RPM. Just asking because if not, KFLDS that has several points higher than LDSMXN in it's stock form, would be throwing dtcs for oem programmings, isn't it?


Again, thank you very much for your help. I really enjoy this forum.

Kind regards,

Hi ZpiXDK, got it now!! Thank you so much for explaining how it works. Will definetly have a look at the LDSMXN map and make tests to understand it.

Will report back with results. Kind regards!!

Hi everybody,

just added v0.3 to the OP with updated and revised information. Go have a look! ( http://nefariousmotorsports.com/forum/index.php?topic=20919.0 ) I still need help with stuff you will see to be completed in the file and with questions here in this thread. ¿somebody williing to keep helping?

Thank you very much in advance!

Kind regards