M52 obd2 swap, DIY wiring harness

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Sido94
E30 Zone Newbie
E30 Zone Newbie
Posts: 1
Joined: Sun Sep 11, 2016 11:00 pm

Mon Sep 12, 2016 5:29 pm

Hello everyone. I'm a new italian user of the forum so, please, be patient and sorry for my bad english. :D
I'm swapping a M52B28 single vanos engine in my E30 320i.

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The donor car is a '97 528 E39.

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Now i'm waiting for the delivery of some parts, like the E34 pan, the engine mounts etc.
But i have a problem. I expected to find in the 5 series an engine wiring with the x20 plug but there isn't.
I think the engine wiring is an OBD2 although the car has a Siemens MS 41.0 ECU (not 41.1 or next).
The E30 has a L-Jetronic ECU with the round C101 connector. My plans were to build an adapter between the C101 and the X20 connector but, obviously, i can't do it anymore.
So, can you suggest me the easiest way to connect the M52 engine wiring to the E30 ?
The engine is going to run stock for a long time, so i prefer not to go crazy with a standalone engine management like Megasquirt at the moment.
The final project is to mount a turbo on it, but only when i'll have enough money ( the engine needs to be rebuild for this upgrade ) and this moment is far.
I'll deal with the right engine management at the right time.

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Now i have the engine wiring harness on my work table and i'm trying to understand how it works.
The donor car has automatic transmission but i'll use a manual, so i'm going to remove this part of the harness.
Can i remove the whole connector to the transmission controller ("Getriebesteuerung" on the label) and all the wires from it ?
I am also preparing to connect a C101 connector to the harness and i'm searching all the wires i need.
I think it is normal that some of this go to the ECU. In this case do i have to split the wires and connect both to the ECU and to the C101 or i must remove the wire from the ECU and connect it only to the C101 ?

Thank you for your help ! :D
Tedswagon
E30 Zone Addict
E30 Zone Addict
Posts: 2195
Joined: Sun Nov 23, 2008 11:00 pm
Location: Edinburgh

Wed Sep 28, 2016 1:06 pm

Hi there, you are just ahead of me as I am planning a swap also. I cannot answer your question but I wondered if you have been on the wiki yet? Its the tab at the top of the page beside "Home" and "Forum". I have a link below to the engine swap for M50 and M52. You will hopefully find some information in that which will help.

http://www.e30zone.net/e30zonewiki/inde ... Swap_-_M5x

I have noticed not too many people come to this section of the forum ( except me!! )

Good luck
E30 316i auto coupe build thread here viewtopic.php?f=25&t=273035
Tedswagon
E30 Zone Addict
E30 Zone Addict
Posts: 2195
Joined: Sun Nov 23, 2008 11:00 pm
Location: Edinburgh

Wed Sep 28, 2016 1:08 pm

E30 316i auto coupe build thread here viewtopic.php?f=25&t=273035
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