BOSH ECU REMAPING

[x3me__]

Hi

i woud like to know if there is any thread on anything related to remaping the bosh ECU m42 , i only find videos and stuff for the siemens ms42 ECU.
Based on a video i saw it is possible and it is even possible to remap in real time with the car running.

If some one could help me i would apreciate so mutch.
i already have 2 cables:

BMW 20 pin to OBD2
and
OBD2 K-Line KWP2000 ISO9141 ( FTDI FT232RL VAG COM KKL 409.1 ) to USB

i know the principals of dumping the BIN from an siemens ECU, but i cant find anything for the BOSH ECUs.

Maybe it is only possible by reading from the fisical chip inside the ECU? Since they sell too mutch and i assume inside the chip are all the maps.

[DesktopDave]

Our Bosch DMEs won't support OBD2 as far as I know. They do support an earlier version, nicknamed OBD1. You could use a BMW diagnostic emulator like a GT1 or DIS, potentially it'll work with those cables.

It's pretty easy to remove the chip from the DME and dump the BIN with a chip burner. It's a standard 24-pin EPROM if I recall correctly. There are quite a few BINs out on the 'net.

There are a few performance chips for the earlier M42, but nothing specific for mapping. If you're looking for a good chip, MarkD has a well-regarded upgrade. He's also a member of this board, comes highly recommended, and generously offers his chips for sale fairly frequently.

I don't think you'd be able to use those cables for anything real-time with the Bosch Motronic 1.7, at least in the early cars. I'd suggest a chip emulator instead, something like the Moates Ostrich.

[x3me__]

yee i was thinking about the chip burn too, i already have an aftermarket chip for the DME and it does the job , actualy increased a lot of my power on low RPMs.
mine is a dme i forgot to say too.

the video i was talking about was this one ( https://www.youtube.com/watch?v=6FdoUqCwcO4 ) about the live maping , i dont know how he done it so xD.

can you sujest me any chip burner? since i dont have one, and i dont wanna get one that is sh*t

Thanks for the reply btw

[1998ccc]

In the USA, all M42's are OBD1.  In the comments section he says "MrArt69
This is a m42 and I'm using stock ecu with real-time programing."

I searched his other videos with no luck.

[x3me__]

I only have the standard BMW 20pin connector. Im in EU btw.

[bmwman91]

This thread is a bit old, but since I know a little about the topic I'll add what I can to be helpful.

First, as far as getting the optimal tune for your E30 M42 which uses Motronic 1.7 (and likely the E36 version which uses Motronic 1.7.2), check out Sssquid Tuning. The owner and I spent a couple of years reverse engineering the M1.7, and I am confident in saying that no other commercial tuner has as much knowledge of it (if only because no other tuner cares much about it since the M42 is not very popular). So, your best bet for an optimized performance tune is Sssquid. Also, I have no affiliation with the company and recommend it only based on my personal experience working with them to optimize the tune for my 2.1L M42.

Second, DIY remapping is not a simple task, at all. Even if you were to know where all of the maps and constants are, how to interpret them and how they interact, you really do need a dyno + wide-band O2 + EGT probes to get it right. I had the WBO2 and EGT probes along with a significant data logging setup, and I still went through close to 30 revisions with Sssquid via remote tuning (they send a modified BIN, I go out and collect data and send it back, then repeat). We got probably 80% of the way there like that, but really getting it settled required live dyno tuning (and I was lucky that someone with the same engine build as me was local to Sssquid and in need of tuning). So if you want to try to DIY just for the fun of it, that is fine, but an off-the-shelf tune is ultimately going to be 75% cheaper than trying to DIY it since a WBO2 + EGT + logger + dyno time will cost far more than a chip.

If you want to nerd out, here are the threads where I detail the M1.7.x reverse engineering projects:
Motronic 1.7 - http://www.m42club.com/forum/index.php?topic=19542.0
Motronic 1.7.3 - https://www.r3vlimited.com/board/showthread.php?t=420029

Note, I will not provide XDF files or other BIN/map info since much of it was done in collaboration with Sssquid, and as such it is not 100% my information to give away.