M3 firewall harness/cover re:m20 diagnostic port and relays

[iwantspeed]

Just went through 70 pages in the member rides engine bay thread and around 40 pages in the 24v swap sub folder.

Couldn't really find anyone who has a m20 with the diagnostic connector relocated on the end of the m3 firewall harness cover next to the fuse box.
And the relays relocated to the inside of the m3 cover

I assume this is because on a late Model( possibly early ) the wiring harness for the diagnostic connector also includes the wiring for the crank position sensor and impulse sensor wire. Those 3 items are wrapped in a wire sheath And end up right underneath the intake manifold.

Same problem for the wiring loom going to the 3 relays in front of the shock tower. The afm wiring and the 3 relay wiring are both in the same loom.

I have my c 101 connector inside the cover.
Could I just cut the sheath around the wires and relocate the relays and diagnostic connector to the m3 cover and just retape the harness?

Stock e30 m3's and 318is's have it setup like this.

How I set mine up. (work in progress)


And Simon's beauty. This how his came stock
This is what I'm after but on an m20.

[glucklich21]

Get a 318i blower motor cover panel and it bolts up directly. Then it's just a matter of relocating everything to the new cover.

[iwantspeed]

Get a 318i blower motor cover panel and it bolts up directly. Then it's just a matter of relocating everything to the new cover.

Thats not the issue im asking about.

[e30rapidic]

You can just cut the sheath and add/remove wire length to put stuff where ever you want it. Here's a picture of my S50 and relocated diagnostic port. I did all the wiring myself....and the main relays are under the wiring cover.

even though its not an M20, gives you an idea what it looks like. I used the bracket that was already there.

[mikeedler]

I put the relays under there, but it just seemed like too much worthless work to set the diag. plug there too. had to make the afm wires a bit longer to go back to it, and actually cut the diag. plug bracket off the M3 bracket.

[iwantspeed]

I took the entire engine harness out, split the harnesses and mounted the relays and diagnostic port. Now I can cut the wires and re splice them in
Wrap the rest of the harness and reinstall it.

[iwantspeed]

Got it done.






I bought the firewall bracket new and apexgoblin hooked me up with the large cover section used but for free I used it for mock up. Going to order the battery tray and firewall cover section new from the dealer.

[e30rapidic]

looks good!

[BelaRaian]

Very good. Keep up your good work.

[kid325e]

Looks great! Keep up the awesome work, my only comment is keep in mind those zip ties will chaff if they're on too tight. Maybe use something with less of a sharp edge to keep everything tidy? To be honest I don't know if that's going to be an issue, just something I thought i'd mention.

[freeride53]

crafty

[iwantspeed]

looks good!

Thanks

Very good. Keep up your good work.

thanks

Looks great! Keep up the awesome work, my only comment is keep in mind those zip ties will chaff if they're on too tight. Maybe use something with less of a sharp edge to keep everything tidy? To be honest I don't know if that's going to be an issue, just something I thought i'd mention.

I was worried if I rewrapped it that the front cover would not clip on.
When I install it I will wrap it then put new zipties.

crafty

Thanks.

[browntown]

Just found this, hoping I can do something similar with a m30 swap. Do you have a part # for the firewall bracket, is it off a m42 car?

Since you put this much work in the rear wiring, I suspect a 318i radiator (ditch the overflow tank) and moving the coil are in order next.

[iwantspeed]

Just found this, hoping I can do something similar with a m30 swap. Do you have a part # for the firewall bracket, is it off a m42 car?

Since you put this much work in the rear wiring, I suspect a 318i radiator (ditch the overflow tank) and moving the coil are in order next.

yep maybe in the future.
i do like that look.

[MR 325]

Great thread, I was just thinking about this today. Want to do the same with my turbo car.

I think I'll email BMA with an order now.