Motronic 3.1 Help

Bahmanson · **Posted:** Tue Apr 14, 2020 7:11 pm

Hi guys, can somebody help me how can i read(or flash) and write Bosch Motronic 3.1 (BMW M50B25 Non-vanos) ecu?

And after read how can work with hexeditor? I'm downloader hexeditor and i opened my ms41 256 kb flash there. I found the rev limiter but i can't edit it for example from 6500 rpm to 7000 rpm.

Greetingz to all !

blacknipel · **Joined:** Sun Sep 10, 2017 4:12 pm **Posts:** 24

The firmware for these old ECUs is located on
a non-erasable removable chip, you need a rewritable EPROM 27C512 and an external programmer, a cheap MiniPro TL866 is suitable. You will find the maximum information on the tuner pro forum

Nedim · **Joined:** Sat Jun 29, 2019 10:08 am **Posts:** 86

viewtopic.php?f=58&t=16929

Have a look here. Look at the file posted from Fabio.

Bahmanson · **Posted:** Thu Apr 16, 2020 1:22 pm

Thank a million guys !

mahdi93 · **Joined:** Fri Sep 13, 2019 3:44 pm **Posts:** 155

Bahmanson wrote:

Hi guys, can somebody help me how can i read(or flash) and write Bosch Motronic 3.1 (BMW M50B25 Non-vanos) ecu?

And after read how can work with hexeditor? I'm downloader hexeditor and i opened my ms41 256 kb flash there. I found the rev limiter but i can't edit it for example from 6500 rpm to 7000 rpm.

Greetingz to all !

you have TunerPro software or RR but in RR you cant modify the rev im doing it with TunerPro software or with HxD send me your bin i can make it 7000 for you but you have to correct cheksum im not sure if TunerPro software auto correct them

blacknipel · **Joined:** Sun Sep 10, 2017 4:12 pm **Posts:** 24

mahdi93 wrote:

Bahmanson wrote:

Hi guys, can somebody help me how can i read(or flash) and write Bosch Motronic 3.1 (BMW M50B25 Non-vanos) ecu?

And after read how can work with hexeditor? I'm downloader hexeditor and i opened my ms41 256 kb flash there. I found the rev limiter but i can't edit it for example from 6500 rpm to 7000 rpm.

Greetingz to all !

you have tuner software or RR but in RR you cant modify the rev im doing it with tuner software or with HxD send me your bin i can make it 7000 for you but you have to correct cheksum im not sure if tuner software auto correct them

I checked all XDF on tuner pro website, they count CS correctly.
Not all XDFs use the correct formula for rpm limiter!
the correct formula is in the PDF "motronic 3.1", which I posted

mahdi93 · **Joined:** Fri Sep 13, 2019 3:44 pm **Posts:** 155

blacknipel wrote:

mahdi93 wrote:

Bahmanson wrote:

Hi guys, can somebody help me how can i read(or flash) and write Bosch Motronic 3.1 (BMW M50B25 Non-vanos) ecu?

And after read how can work with hexeditor? I'm downloader hexeditor and i opened my ms41 256 kb flash there. I found the rev limiter but i can't edit it for example from 6500 rpm to 7000 rpm.

Greetingz to all !

you have tuner software or RR but in RR you cant modify the rev im doing it with tuner software or with HxD send me your bin i can make it 7000 for you but you have to correct cheksum im not sure if tuner software auto correct them

I checked all xdefinition on tuner pro website, they count CS correctly.
Not all XDFs use the correct formula for rpm limiter!
the correct formula is in the PDF "motronic 3.1", which I posted

yes you are right but i found a way to do it in TunerPro software
(for 402 ecu from 6500 to 7000rpm change the 6965 to -5315) you can check it with RR you will find you 7000rpm )
but we need to make it work in RR

Fabio · **Posted:** Sun Apr 19, 2020 5:12 pm

mahdi93 wrote:

yes you are right but i found a way to do it in tuner software
(for 402 ecu from 6500 to 7000rpm change the 6965 to -5315) you can check it with RR you will find you 7000rpm )
but we need to make it work in RR

Updated Definition, Now You can change 1x1 Limiters (RPM/Speed).
Looks like if You insert a value "50" in every cell in "Lambda Map 3" You disable Lambda Feedback which interfere Fuel Tuning.

mahdi93 · **Joined:** Fri Sep 13, 2019 3:44 pm **Posts:** 155

Updated Definition, Now You can change 1x1 Limiters (RPM/Speed).
Looks like if You insert a value "50" in every cell in "Lambda Map 3" You disable Lambda Feedback which interfere Fuel Tuning.[/quote]
its working great , thanks fabio

mahdi93 · **Joined:** Fri Sep 13, 2019 3:44 pm **Posts:** 155

Fabio wrote:

Looks like if You insert a value "50" in every cell in "Lambda Map 3" You disable Lambda Feedback which interfere Fuel Tuning.

so to disable lambda feedback i have to put "50" in map 3 cells ?? and zero in other map or no need to do that ???

RomRaider

Motronic 3.1 Help

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