A few questions

[E30SPDFRK]

Bump, I need to know this stuff guys.

[E30SPDFRK]

OK, I'm getting to the final stages of my swap (it should be done sometime this week) and I have a few questions left than need answering. I have a lead on an 87i harness, but it looks like I wont be getting it in time. So my questions are:

Harness- what do I need to do with the one I have now (e34 535i stick)? I need this pretty detailed because I suck at wiring.

Coolant hoses-what do I use? I'm thinking e32/4 upper and lower radiator hoses, but what ones do I need to hook up the heater-core and an early e30 overflow tank?

Alternator- can I use my eta one, or do I need a m30 one?


And my lower timing case oil seal doesn't hit anything on the inner side but I think it is supposed to sit on the timing chain gear. An I correct, and if so, how do I fix it? This is kind of hard to explain, I'll try to get a picture of it tomorrow.

Thanks to everyone who has helped me with this so far.

[duodvlhntr]

Oh, and another thing, the engine I have is from an automatic... Does this matter at all? I just need to find a computer for a manual 535i, right? Or will mine work?

[duodvlhntr]

Sweet! Thanks for the quick reply. Now all I have to do is track another one down....

[Funkmasta]

Okay, so I just read through all 6 pages of this and the only part I'm confused on is the transmission. I'm doing the same swap but into a 87is. Yay for me, I get to keep the wiring. However, which transmission do I need? Sorry, to thread jack a little but I got confused and figured I'd ask while the subject was still hot. Will a 84 633csi transmission work?

yes, that trans will work

[duodvlhntr]

Okay, so I just read through all 6 pages of this and the only part I'm confused on is the transmission. I'm doing the same swap but into a 87is. Yay for me, I get to keep the wiring. However, which transmission do I need? Sorry, to thread jack a little but I got confused and figured I'd ask while the subject was still hot. Will a 84 633csi transmission work?

[E30SPDFRK]

Cool, looks like I need to start looking for a new harness again.

[Funkmasta]

Wait, 87 325i or 87 325e?

Earlier TB from a e28 535?

87 M20i runs on the same Motronic as the M30b35, and is nearly a plugin for your car.
I can get more details tomorrow, the car is still here

and ya, the E28 535 has the correct TPS/TB

[E30SPDFRK]

Wait, 87 325i or 87 325e?

Earlier TB from a e28 535?

[Funkmasta]

Also, you are going to need a throttle body from an earlier car, or an earlier TPS.

[Funkmasta]

Byron, run the 87 M20i harness. We just put an E32 M30b35 motor into an 87e car using an 87 M20i harness. We had to extend the TPS wire, oil level wire, and we removed the AC, but if you are keeping it, you will need to extend that also.

[E30SPDFRK]

What exactly would I need to do if I got one from an 87e? I've heard you need to extend the injector wires or something like that, is that it? I had a really hard time finding one around here, but if it is going to make the wiring simple then I guess I need to start looking again. I need to get this thing done in the next 2 weeks so I would like to make this as simple as possible.

[Funkmasta]

Byron, can you get an 87 M20i harness? It is nearly a direct swap... that is what we used on the 87 325e that we just converted...

[flawdaboi407]

E34/E32 harness: (got it from m535i.org)
Pin 1, BU goes to the alternator. Comes from the Instrument Cluster "charge indicator" light. BU in the fuse box.
Pin 2, GN/YL comes from oil lever sensor. It is BU/BK in the fuse box and runs to the static oil level active check control unit, which is the same as the oil level light.
Pin 4, BR/VI comes from the coolant temp sender unit. It is BR/VI in the fuse box and goes to the Instrument cluster temp gauge.
Pin 5, BR/GN Oil pressure switch. Runs to instrument cluster oil pressure light.
Pin 6, GN/WH goes to the O2 sensor heater relay. Gets power from fuse 9 and in the fuse box is colored GN/YL.
Pin 7, GN comes from the ignition switch and goes to the Start Input, in the motronic unit and it also goes to Pin 15 on the coil. In the fuse box it is colored GN.
Pin 8, WH/BK comes from the motronic unit "present fuel rate output". Is YL/WH in fuse box and runs to Fuel Economy Gauge in the bottom of the tach.
Pin 9, BK goes to the ECU Engine speed output. This is BK in the fuse box. On the E28 this actually should be the connected in C103.
Pin 10, BU comes from the oil level sensor. It is VI/GN in the fuse box and goes to the active check control unit as the dynamic oil level light.
Pin 11, WH/GN comes from Pin 7 of the diagnostic connector. Is WH/BU in the fuse box and goes to the Service Indicator Processor.
Pin 12, GY comes from the ECU and is the trigger for the "Check Engine" light control. In the fuse box it is BR/BK. This wire is not used on the E28, since there is no check engine light.
Pin 13, GN/VI comes from Pin 87 of fuel pump relay. Is VI/RD in fuse box and runs to Fuse 11.
Pin 14, BK/WH comes from motronic unit "Speed Signal Input". Is BU/YL in fuse box and goes to the Speed Input of the Instrument Cluster.
Pin 15, BK/GN comes from Pin 30h on the coil. In the fuse box it is BK/GN and runs to the unloader relays.
Pin 16, WH/BK comes from Pin 6 of diagnostic connector and is used in the SRS system. In the fuse box it is WH/BK and is said to be not used.
Pin 18, BK/YL is the starter trigger and comes from in the car. It is also BK/YL in the fuse box. It also runs to Pin 11 of the diagnostic connector.
Pin 20, RD/YL comes from Pin 87 of the main relay. It is RD/YL and goes to power the ABS Hydraulic Unit.

[E30SPDFRK]

Ok, wiring time. Specifically, what do I need to do with my chassis plugs? This is the one on my car (86 325e)

And these are the ones on my e34 535 harness



They are all females, so they don't plug into each other, and they wouldn't line up if they did. This is the one part of this swap that kind of scares me, as I have almost no idea what to do.