Tuning: From 732iA to 730iA

[!LT!$]

hey gisle,

which electric parts do you use, the e23 or from an other car?

i planed the same engine swap for my e24, i know the technical thing is not the probelem, but the electrical system.

i have the hole wires from an e38, but i see the problem in the brake system and the signal for the speedometer.
the e24 with e38 technic would be great

greetings
sebastian

[Gisle]

Zitat von !LT!$

which electric parts do you use, the e23 or from an other car? e24, i know the technical thing is not the probelem, but the electrical system

Sorry for late answer. Primaly I use as much of the E23's wiring as possible. But all wiring from after the distributionbox and to/from (Thru connector C101) the engine is in this case M60. The M60 has already an integrated fuelpump relay, so you have to cut away the old E23's system. The only supply TO the engine from the distributionbox is:

- Constant positive from battery (Thick massive red cable)
- Ignition 2 (Hot in run & start)
- Start

The rest of the cabels is just return cabels as:

- Oilpressure
- Oiltemp
- Watertemp
- Charging lamp
- Current for the fuelpump

I'll post some photos and sheets later on how I have done it. In this way one avoids speedo & ABS-challenges. Again ... this is just a temporarily solution. l'll probably end up as You think. Replace everything (or as much as possible with E38). But that is another year in the future.

[!LT!$]

and the engine will run without a EWS signal?

At the e38 the engine will only turn without an ignition spark, so you need the ews module and the right key there.

I think the cableform, from the e38 will be the easiest way to run the engine and use the most of the funktions from that car.
The BC will also run, you need only some resistors.

In fact, the ABS and speedo ist the greatest challenge.
You need the same signals like the e38 or you can code the control boxes with the e23/24 signal.

Don´t know which is the better choice...

[Gisle]

At the e38 the engine will only turn without an ignition spark, so you need the ews module and the right key there.

Not absolutely essential. It looks as if EWS DWS only gives a signal to the Starter Immobilization Relay with E38 wiring. Easy to change over or disable. (I think). I think I'm ready to start up after the rebuilding in week 24 or 25 Then there are 2 weeks on work before I can continue the work on my project and eventual troubleshooting or try other solutions if the theoretical planning on wiring diagram E23 to M60 would not work as planned.

[!LT!$]

I convert my e38 750i into a 740i with manuell transmission.
After weeks over the wires i would start the engine, but it only turns.
No ignigtion spark without the ews signal.

so i think the engine box need the signal from the ews to start.
but you wrote that you take electric from a e34, maybe it works without the ews.

[challenger_ss]

Zitat von !LT!$

I convert my e38 750i into a 740i with manuell transmission.

Why that? Must be a hell of a job...

[Gisle]

Well, I have not come as far as trying to start it, but it turns OK. I have made a patch from the Dist.Box to and from the M60. If it is the case to get a signal from EWS, I'll just have to deal with that when time comes. If I'm stuck in a corner, I'll just ask for help from some one who knows ...

But have in mind, this build is just temporarily ... everyting here are build for guiding myself in right direction on my way for more permanent solutions as the test og the build goes by.


The heat exchangers for the steering & brake oil and the ZF 5HP-getriebe is located in front of the coolingwater exchanger. Lots of space.



As you can see, the Patch-cable goes from the original C101-connector through the rubberseal on the side of Right-hand distr.row. I have also ordered a new cap for the expansion tank.



Underneath everyting is in place, exept the downpipes w/catalyst and LAMBDA- / Oxygen sensors



I have ordered 2. ea new Oxygen / LAMBDA sensors. And I have to change the rubber mounting suspension to the rear differential.



More or less the final layout of the (temporarily) enginebay of the M60B30 in my E23. Seems I have temporarily to settle for a K&A-filter solution.

[!LT!$]

Zitat von challenger_ss

Why that? Must be a hell of a job...

i still want a e38 with manuell transmission, but found no car which makes me happy, so i have to build my own.

i would say, it was a total restauration of a e38

[challenger_ss]

Zitat von !LT!$

i still want a e38 with manuell transmission, but found no car which makes me happy, so i have to build my own.

i would say, it was a total restauration of a e38

Respect but why not. A friend of mine converted a 82' 745i from the M102 to the M106 motronic engine and then to manual 5 speed. Actually there where no manual 45ers built. A hell of a car, I checked it personally :-)))

[Gisle]

Zitat von !LT!$

so i think the engine box need the signal from the ews to start.

You have right! I need to re-program the DME to ignore loss of signals from ABS and EWS. But I'll get someone to do it for me.