1985 BMW 745

[DevInAz]

This post is to start my new project log. I just bought this 1985 745 that is pretty bad shape cosmetically but all the drivetrain is in decent shape.

Specs:

Factory Engine and automatic transmissio
Vems 3.3 (had a extra from a old project)
Boost controller
stock ignition for now
stock 30lbs injectors as long as they clean up and flow test well. I also installed a 3bar pressure regulator instead of the stock 2.5 because it failed and the 3bar I had as an extra on the shelf.    <------   EDIT

Goals:

to have a clean daily driver
500hp/tq
manual swap
full leather interior

I'll start my research tonight for trigger wheels.

[gunni]

I reccomend M30B25 60-2 trigger wheel fitted on the front. quickest and easiest

[mattias]

.. and 60-2 allows you to use a wasted spark coilpack (or fire separate coils in pairs) instead of the distributor ignition.

VEMS can control boost, no need to complicate the situation with a separate boost controller. You can use anytrim function to get a manual override.

[DevInAz]

Here are some pictures of the car before work begins.












The top e23 is a 85 735 that i'm using as a interior donor. All the wood trim and a bunch of other pieces are in great shape. This car will be stripped and sent to the crusher in about a week.




The floors are really dirty in that picture but thats the shop

[DevInAz]

VEMS can control boost, no need to complicate the situation with a separate boost controller. You can use anytrim function to get a manual override.

Sorry thats what I mean but i'll install a boost solenoid and hopefully I can get it to work better than the solenoid on our e30 that I still can't seem to get right. On this e23 i'm going to use the headlight leveling switch position in the dash for the anytrim function.

I'm pulling the motor and trans out of the donor car today, I'll mock up a 60-2 wheel I have from a e30. I don't know if those fit or not but I have a few extras laying around and I could make one work i'm sure.

[gunni]

how have you plumbed the e30 solenoid? which one is it?

[DevInAz]

Here is a picture of the solenoid i'm running. I thought I had a picture of it installed but I guess not. I'll take a picture tonight and post it up on the other thread. The e30 has been sitting because I can't make the boost solenoid work with the vems and it hits my fuel cut at 3000rpm every time.

http://www.vemssupport.com/forum/index.php/topic,1473.60.html

[DevInAz]

Injector information.  I'll be sending these out to get a good cleaning and flow sheet done on them soon.


Part Number   lbs/hr   cc /min   grams /min       PSI   BARS     lbs/hr    cc /min     80%   95%   Feed   Impedance     Application   n-H

0-280-150-200   28-Jun          300.6   216.2        43.5       3.0      28-Jun   300.6    44     52.3    Top     Low         BMW, Peugeot     -



I'm looking for a factory 60-2 wheel along with sensor and the mount. I'll head to the junkyard next week to see what I can find.

                                       

[DevInAz]

Trigger wheel pictures. I got this 60-2 from a 535 at the junkyard for $25 with the sensor bracket and sensor. I installed these on the car yesterday along with new belts.



Notice the pulley size difference. I reused my old pulley which was the smaller one.

With the old wheel it had one trigger pin and I was wondering what it and the sensor does considering it doesn't run the the ecu. I found where it goes and i'll be cutting it out of the diag port soon.

[DevInAz]

Does anyone have a config for a m30 I could start with? or a stock timing map?

I've started my engine wiring harness and its half way done. I've included a Idle control valve from a m30 instead of the manual idle valve. I'm going to run the stock ignition for a little while and figure out what coils I want to use. I was thinking a coil pack from a GM since they are very available. I'll post pictures of my wiring harness tonight.

[DevInAz]

Here are the current pictures of most wires being ran. Since I haven't installed anything in the car yet I don't know where I'm going to mount my VEMS so I don't know the exact length. Later tonight I might pull the factory harness out and start running all these wires into the cab so I have a exact length and mounting location. I hope to have all this installed and running by friday this week.

[DevInAz]

The car is now running but doesn't drive yet. Here are some pictures.  I used the factory m106 tps bracket but modified it then installed a e36 tps and that part works great.

This is how the car was before anything was done.



The factory harness before being cut open.



Harness removed with factory injectors before I got them cleaned and flow tested.



new TPS bracket and installation.



The Idle valve I wanted to use before I found out that it gets in the way of the factory charge pipe. I'll figure out another way of doing this. For right now I've enabled ignition advance idle control and that seems to do ok at least for a little while.

[DevInAz]

The car is now running with a good idle and can rev slowly to 3500rpm. I'm using stock 13lbs injectors that are high imp from a 86 735. these will be to small for my motor once boost starts rolling in so i'll use the cleaned factory injectors that I just got back from being rebuilt and flow checked. See the picture with chart below for the injector specs.  My question is since these are low imp injectors do I need to use this power resistor http://shop.vems.hu/catalog/power-resistor-p-120.html and switch to PWM my injectors? Or do I put resistors in the harness and not change my PWM settings from 100% and 25.5ms?



I pulled out the exhaust today to weld on a o2 bung. Here are some pictures... This thing is muffler is crazy heavy so i'll change the exhaust out later I think.





here is the late model timing wheel I used.

[DevInAz]

Here is my config.

http://www.box.net/shared/fb3e8ovxduri14fpaohz

Here are some logs starting with a trigger log.

http://www.box.net/shared/zyu6p9yb9sao7dh20kr5

runnings logs.
http://www.box.net/shared/u2poa259fqp6yfxxckpj
http://www.box.net/shared/e1d57g03cruladi2demg
http://www.box.net/shared/1caa68ifp50j6rq0tiox

The car seems like its misfiring but all plugs are firing and all injectors are firing. I'm thinking my number 6 injector is leaking badly but I don't know yet and I don't really care since I need my other injectors to get installed.

On another note the vehicle runs pretty good while idling and not in gear but when I put the car in gear the rpm drops 450rpm and has a really poor acceleration. I think i'm going to install a m54 idle control valve since it isn't idling like I thought it would with the ignition advance.  This car has its EGS (trans computer) and DME in the same housing which i've never seen before on a BMW. I need to figure out how to get the egs working so it shifts gears without the dme being part of the system.  Does anyone have a wiring diagram for this 85 745??? I can only find US car diagrams and they are totally different.

[DevInAz]

Transmission is fixed. Some of the power and ground wires I cut while building the new harness. The original DME is now behind the speaker again but unhooked and only the transmission side is plugged in. I just went for my first cruise in the car with vems and it was pretty smooth. It still has the worlds worst tune in it but it does drive so we are getting somewhere.