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Old 01-10-2012, 10:22 AM   #1
BimmerboyPH
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E30 Engine Build, NEED HELP!!

Hi guys,

I am putting together an engine for my car and I have a few questions.

The car is an 84 325e, and I am putting the i head on it. I have the head, intake manifold, afm and the i 173 ecu. My question is, do I really need the wiring harness from an i as well, or can i modify the existing harness to work?

Thanks, Phil.
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Old 01-10-2012, 12:04 PM   #2
Bullet Ride
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You will need an "i" wiring harness. Since your car is pre 87 it's motronic 1.1 which is 35pin connector. Motronic 1.3 is 55pin.
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Old 01-10-2012, 03:18 PM   #3
BimmerboyPH
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shitttttttttt. okay thanks
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Old 01-10-2012, 03:20 PM   #4
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can i modify the existing one? like change a few connectors etc?
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Old 01-10-2012, 04:10 PM   #5
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Phil, I think you got your answer as the head of your wiring harness won't match the DME pin connection. 35 vs 55. You'll need to remove the harness and swap it out to make the 173 dme work.
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Old 01-10-2012, 04:28 PM   #6
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shitttttttttt. okay thanks
Are you still in Guelph?
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Old 01-10-2012, 05:46 PM   #7
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The hardest part about swapping the engine harness is getting that (*^*&% rubber grommet through the hole in the firewall. There's really not much to it.
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Old 01-10-2012, 08:54 PM   #8
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Jesus christ Phil.. I told you at work you need the harness...

****ing yard...

Click me because I'm a ****ing retard named bucket
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Old 01-10-2012, 10:11 PM   #9
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Jesus christ Phil.. I told you at work you need the harness...

****ing yard...

Click me because I'm a ****ing retard named bucket
lol thanks Sam
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Old 01-10-2012, 10:12 PM   #10
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Are you still in Guelph?
No sorry I'm out for the night.
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Old 01-11-2012, 08:47 AM   #11
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No sorry I'm out for the night.
I just meant in general. I have an i wiring harness, but I'd have to double check that all the connectors are there. It came off of Rob's old M20 (El Gato Liso) so I wouldn't be surprised if something was missing lol
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Old 01-11-2012, 08:55 AM   #12
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I just meant in general. I have an i wiring harness, but I'd have to double check that all the connectors are there. It came off of Rob's old M20 (El Gato Liso) so I wouldn't be surprised if something was missing lol
Ooooh okay lol. Yeah let me know, if its good I'll take it for sure.
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Old 01-13-2012, 03:23 PM   #13
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Ooooh okay lol. Yeah let me know, if its good I'll take it for sure.
Sorry I haven't had a chance to take a look yet. If you want to come by this weekend you can take a look at it.
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Old 01-14-2012, 11:57 AM   #14
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can i modify the existing one? like change a few connectors etc?
Yup. Its what I did to swap an entire i engine in my e. I had an 85 so the same C101 rectangular connector as you. Not sure why you aren't tuning the "e" computer? If you swap computers the stock "e" block flywheel injector pickup won't be read by the "i" computer and various other sensors, like the 7th injector etc...? The crank position sensor on the "i" engine is on the harmonic damper as well.

Rudy has a 2.7 "i" engine, not sure how his is configured whether he swapped flywheels and damper. (e engine is heavy dual mass flywheel).

If you get this sorted out I have a tuned "e" computer from MarkD. Granted its not tuned for 2.7L but it may be a good start for you, if you're interested in it.
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Old 01-14-2012, 12:40 PM   #15
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Quote:
Originally Posted by DR.ZED View Post
Yup. Its what I did to swap an entire i engine in my e. I had an 85 so the same C101 rectangular connector as you. Not sure why you aren't tuning the "e" computer? If you swap computers the stock "e" block flywheel injector pickup won't be read by the "i" computer and various other sensors, like the 7th injector etc...? The crank position sensor on the "i" engine is on the harmonic damper as well.

Rudy has a 2.7 "i" engine, not sure how his is configured whether he swapped flywheels and damper. (e engine is heavy dual mass flywheel).

If you get this sorted out I have a tuned "e" computer from MarkD. Granted its not tuned for 2.7L but it may be a good start for you, if you're interested in it.
Just to add a note to anyone looking into this, I'd recommend not using the E front damper, not only because of the lack of a trigger wheel, but the fact that the weight and harmonics may not be ideally suited a higher revving engine may cause issues down the road, especially if the motor gets used hard.

My motor was, and to keep things simple, a 325i with 2.7 internals. Everything else on the outside was from the 325i, including harness, sensors, damper, flywheel, etc etc.
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