e34 3.5 direct drop in?

[sfdon]

The other wires.....

Reach into the bunch of wires we fileted and find the blue wire
Cut it and you now have your alternator wire

 

[sfdon]

Alt wire

 

[sfdon]

Find the small gauge black wire and cut it. This is your tach wire
Make sure you delete the rest that goes around to the coil- no longer used.

 

[sfdon]

Find the brown/white wire- this is your temp gauge wire.
Cut it.

 

[sfdon]

Find the solid green wire this is power to your coil and turns on your computer.
Cut it

 

[sfdon]

Now you have 7 wires....
Green/white gets extracted from back of fuse block. Hot wires hanging around in the engine bay Are no good.

The other six wires get connected to the new engine wiring harness for your fuel injected engine.

All those other loose ends, the black, green, blue, black/red, brown/white wires need to be chased down and removed. Don't leave bogus wires in your car!

 

[sfdon]

The match ups for hooking up a FI engine harness

Coupe...motronic

Alternator
Blue to blue

Coil power
Green to green

Oil pressure
Brown/green to green/brown

Starter
Black to black/yellow
(Big gauge black)

Temp gauge
Brown/white to brown/yellow

Tach
Black to black
(Little gauge black)

You will need one more wire!

Fuel pump
Green/violet to green/violet

 

[CS Specialist]

Do a complete teardown, replace the rings, check the piston clearances, have the valve seats ground and re-seal the whole thing. Or, just put it in and take your chances...

 

[texinbc]

When I did this installation on my car I searched this site for any references that seemed appropriate, i.e. 3.5 install, motronic 1.3, 5 speed swap, etc. etc. When I found a thread that looked helpful I bookmarked it. I also printed any comments that could be referenced easily while searching for parts.

While it is said that the 3.5 swap is relatively easy, "relatively" is the operative word. That said, once you get it installed and running, the 3.5/5-speed combination turns the coupe into a usable GT in modern traffic.

By the way, if you search sfdon and 3.5 you will likely find all the answers. I couldn't have done my car without this forum.

Good luck!

What 5 speed did you go with, the 260, the 265?

 

[Rek]

The match ups for hooking up a FI engine harness

Coupe...motronic

Alternator
Blue to blue

Coil power
Green to green

Oil pressure
Brown/green to green/brown

Starter
Black to black/yellow
(Big gauge black)

Temp gauge
Brown/white to brown/yellow

Tach
Black to black
(Little gauge black)

You will need one more wire!

Fuel pump
Green/violet to green/violet

I really appreciate this. Thanks a lot.

 

[texinbc]

This is wonderful to see such helpfulness within this community. Thank you all so much

 

[texinbc]

I think the oil pan needs to be swapped or it won't clear the subframe. Looks like it's been sitting outside, can't be good, and why was it pulled?

Do you know which oil pan I need to swap it with?

 

[HB Chris]

Don knows which ones fit

 

[Rek]

Just completed this but the wiring diagram for the motronic on the E34 has a red power wire going to the post iin the Motronic box, fused for 50amps. It does go to the main relay but is this for ABS or something unrelated to Motronic?

 

[Ohmess]

It sounds like you are looking at this from the wrong direction. A big red power wire fused for 50 amps and wired to the main relay is probably your power source for the motronic system and hence the source of ignition power for your engine. The post is merely for power distribution.

 

[sfdon]

Sounds right Mr Chris!

 

[Layne]

E34 has a red power wire going to the post in the Motronic box, fused for 50amps.

I'm not so sure about that. There's no 50 amp fuse on any E34 I've ever seen. There is an 80 amp "fusible link" (similar to a mega fuse) that basically powers everything on the car except the starter motor. Anyway, the DME does not require 50 amps, and you won't be supplying it with a wire capable of carrying 50 amps, so I would probably fuse it for 20 or 25 amps and power it with a 12 awg wire. I'm doing the same conversion right now, installing motronic 1.3. I'm building a fuse and relay box out where the battery used to be and supplying all of my new circuits and some of the old ones from that rather than adding additional load to the existing fusebox.

 

[sfdon]

A bit overkill but you can install 3 fuses on a Motronic 1.3 conversion.
Fuel pump 15 amp
Green wire to coil 15 amp
10 gauge wire from starter to Motronic bus by ECU 30 amp
Makes you feel good I guess

 

[Layne]

It's not overkill really. A fuse protects the wire. If you combined all of those into one 60 amp fuse, you'd have to run 8 awg wire everywhere for it to be protected by that fuse. Can't do that anyway, because they are 3 separate circuits that are on or off at different times.

 

[sfdon]

Don't get me wrong- fuses are a great thing. I spoke a little sloppy there. I put 2 fuses in every harness now.
I wish I could do 3 and keep them all in the same spot. Fuel and main go in glove box.
It's the wire to the coil that's the problem to fuse. I have put those on top of the brake booster.
Maybe move the green wire to bottom of fuse 6 in the fuse box instead of top?