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Thread: 1985 745 rebuild log

  1. #1
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745

    1985 745 rebuild log

    UPDATE: After a four year pause this build is now back in action. I'll be changing my old photobucket links to ImageShack, this should take a few weeks. Click here to see all my pictures in the album: https://imageshack.com/user/Devin1205
    Many things have changed, the ECU is now a Link Fury g4+.
    __________________________________________________ __________________________________________________
    Hello,

    my name is Devin and this is my rebuild log for my 745

    here is my other thread for my standalone install. http://www.vemssupport.com/forum/ind...ic,1782.0.html This is mainly a thread for engine management install but my old pictures are in here.

    Pictures from when I first got the car.










    I'll take and post new pictures sometime this week. work is slowing for the holidays so i'll have more time for my 745.

    Things I will do in the next few weeks:

    new 3inch exhaust that will need to be as quiet as possible.
    Remove and wrap my new engine harness now that everything is working like it should.
    finish my interior.
    find my boost leak.
    fix the leak in my hvac system.
    drop off my m parallels for straightening and painting.

    To come in the future:
    respray car
    new diff bushing and trailing arm bushings
    tint (a must in vegas)
    Custom radiator with electric fans controlled by VEMS
    rebuild a/c system
    electronic boost controller
    fix my si board
    find and install new seats (i'm thinking about e39 or e38 seats)
    recover all interior
    replace trans cooler lines
    Last edited by DevInAz; 02-20-2018 at 01:10 AM. Reason: Automerged Doublepost

  2. #2
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    Long story short... the battery died. I tried to start it with a bad wiring connection(not knowing it) and the car started melting its body harness because previous owner put 30 amp fuses where 7.5 ampers belonged.

    I started tearing the car apart because the burnt wires under the dash couldn't be reached while the dash was still in the car. Also my instrument cluster melted down and caused a battery draw.

    After I found the draw i figured out the engine was started and it wouldn't shut off with the key because a power wire burned into the KL15 wire.

    Cause: ABS system caused over drew of the wiring and the fuse never blew.

    Now: ABS harness and system has been removed except for the ABS pump and valves. Only the wiring and the control module has been removed. I also removed the transmission harness since I now have a 4-hp24 non EH.

    Pictures of the interior coming apart:













    Last edited by DevInAz; 02-20-2018 at 01:18 AM.

  3. #3
    Join Date
    Mar 2007
    Location
    SD, Cali, USA
    Posts
    11,707
    My Cars
    1995 M3, 1985 745i , S13 240sx sr20det
    Keep the pics coming, I'm interested. That's way more work than I would ever want to put into my 7


    95 BMW M3 Alpine-
    <GO...JIC Cross Coilovers- UUC RCAB, AKG FCAB, Rogue Engineering TM bushings- AA Gen3 Exhaust- Dinan F&R Strut Bars- Dinan F&R Sway Bars- X-Brace- Mishimoto Rad- BBS RK 17x8"- TRM Chip- Dinan BBTB- DIY CAI- JP Performance Headers- 21.5 injectors- JB Racing Flywheel- Bimmerworld TB boot- 540i MAF><SHOW...OE euro clear exterior lights- Depo w/ HID- Hurricane Alcantara interior- Stereo (Kenwood,Sony,MB Quart,Rockford Fosgate,JL Audio)- Black kidneys- Euro 3 Spoke- ZHP Knob- AutoDim Mirror>

  4. #4
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    I just ordered new floor mats, all the seals for the heater box. I still need to check the valves on the heater box to see if any are leaking.

    We finished the 3 inch exhaust too and i'll post some pictures of that up later.




    Last edited by DevInAz; 02-21-2018 at 02:30 AM.

  5. #5
    Join Date
    May 2011
    Location
    Brisvegas, Straya
    Posts
    247
    My Cars
    1990 735il
    Nice looking car. Has to be the cleanest workshop I have ever seen!
    1990 735il

  6. #6
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    Lewie12 - thanks for the compliments but its trashed right now. We've been working hard and haven't had to much time to keep it clean.

    Update: carpet is now N/A and can't be ordered. For all the heater box gaskets and everything I need none of those can be purchased through the dealer either. That means I need to find another source for these parts or figure something else out.

    for the carpet i'm going to remove it and dye the whole thing black instead of buying it new. I'll take picture of that in a bit.

  7. #7
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,487
    My Cars
    1983/84/85 745i

    Thumbs up

    Hate to break it to you, but someone stole your interior!



    Still have that exhaust off? I am interested in the rear resonator. I tried to PM and email but you have those turned off.
    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



  8. #8
    Join Date
    Mar 2007
    Location
    SD, Cali, USA
    Posts
    11,707
    My Cars
    1995 M3, 1985 745i , S13 240sx sr20det
    Hitman what resonator are you looking for? I have a midpipe I want to get rid of.


    95 BMW M3 Alpine-
    <GO...JIC Cross Coilovers- UUC RCAB, AKG FCAB, Rogue Engineering TM bushings- AA Gen3 Exhaust- Dinan F&R Strut Bars- Dinan F&R Sway Bars- X-Brace- Mishimoto Rad- BBS RK 17x8"- TRM Chip- Dinan BBTB- DIY CAI- JP Performance Headers- 21.5 injectors- JB Racing Flywheel- Bimmerworld TB boot- 540i MAF><SHOW...OE euro clear exterior lights- Depo w/ HID- Hurricane Alcantara interior- Stereo (Kenwood,Sony,MB Quart,Rockford Fosgate,JL Audio)- Black kidneys- Euro 3 Spoke- ZHP Knob- AutoDim Mirror>

  9. #9
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    Hitman - I checked my settings and they are all enabled to receive emails and PM's.

    for the interior it was the side of my shop that stole it all haha.

    My dash was dropped off at the interior place today and they are going to fix all the really bad cracks and make it black for me.

  10. #10
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,487
    My Cars
    1983/84/85 745i

    Thumbs up

    Again, thanks for making this repair thread. It keeps this section alive with content!

    The dash repair is of interest to most of us. I am very curious to see how all that will turn out.
    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



  11. #11
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    I sent the dash off today with the interior man. He is going to wrap the dash in black vinyl for $350. thats a lot better than the $550 the dealer wanted. I'll have it back by next friday.

    I'll finish the carpet dying and the heater box tonight. I'll take some pictures. Remember that I can't find any factory seals for the heater box at all.

    I'll be making all the seals myself. I'm not happy but it is what it is.

  12. #12
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    The dash is back! and it looks great! i'll post pictures up in a bit.

    I'm kinda stuck on the a/c box. since I can't buy ANY seals for the a/c box I need something that I can make seals out of. any ideas?

    I've looked around alittle bit and have found some single sided foam tape but I need some thin sheets for covering the flapper doors...

    hopefully someone has some ideas! i'd love to get this thing done.

  13. #13
    Join Date
    Mar 2007
    Location
    SD, Cali, USA
    Posts
    11,707
    My Cars
    1995 M3, 1985 745i , S13 240sx sr20det
    If u haven't already dyed carpet i saw ad in roundel for new for $400


    95 BMW M3 Alpine-
    <GO...JIC Cross Coilovers- UUC RCAB, AKG FCAB, Rogue Engineering TM bushings- AA Gen3 Exhaust- Dinan F&R Strut Bars- Dinan F&R Sway Bars- X-Brace- Mishimoto Rad- BBS RK 17x8"- TRM Chip- Dinan BBTB- DIY CAI- JP Performance Headers- 21.5 injectors- JB Racing Flywheel- Bimmerworld TB boot- 540i MAF><SHOW...OE euro clear exterior lights- Depo w/ HID- Hurricane Alcantara interior- Stereo (Kenwood,Sony,MB Quart,Rockford Fosgate,JL Audio)- Black kidneys- Euro 3 Spoke- ZHP Knob- AutoDim Mirror>

  14. #14
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    CMG - thanks for the heads up but its already dyed and installed back in the car. I've been taking pictures along the way but haven't loaded them in yet.

    I rebuilt the heater box with insulation tape from homedepot. Its good to 175 F so we'll see how it holds up. Anything will be better than the none existent foam that WASN'T in the box. Tomorrow i'll be spending all day locked away working on the car with my phone turned off. I hope to have the full thing back together in one day but we shall see. hopefully I don't need any parts for anything.

  15. #15
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    I didn't look through these pictures before posting them so disregard the worthless ones. Most of it is in order. The car is much further along than the pictures show because my camra died and the wife and I can't find the charger. ask questions if needed but it should be pretty straight forward.

    So far I have $412 into the full interior and its fully assembled right now. Some how I have prevented the passenger seat from getting power and now the blinkers don't work. Both should be easy to track down but thats next on my list.

    I also torn apart the seat bases on drivers and passengers and pressure washed them, disassembled them and rebuilt them for a cost of 1 can of HHS and some bearing grease. Drivers works perfect, i'll see about the passengers when I get some power to it.























    Last edited by DevInAz; 02-21-2018 at 02:38 AM.

  16. #16
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
















    Last edited by DevInAz; 02-21-2018 at 02:48 AM.

  17. #17
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    For the seals on the heater box I used Wurth black silicone sealant and 1/8in foam tape from hopedepot. Since I couldn't get the seal from the firewall to the evap case I siliconed it up and squished it all together. It made a great seal! i'll take pictures tomorrow but its nice and clean and didn't make a mess at all. Also while I had the evap box out I grinded all the rust out of the firewall and sprayed it with primer and black paint then put the box back it.















    To do list:

    install new transistors in the final stage units.
    fix passenger seat
    fix blinkers
    re make idle control valve circuit
    purchase and install high impedance injectors (60's or 80's pounders should do)
    new fuel pumps
    paint vehicle (maybe in 2 weeks time)
    some kind of sound system (only have head unit)
    headlights need to be replaced with euro's and HID's
    Last edited by DevInAz; 02-21-2018 at 02:52 AM. Reason: Automerged Doublepost

  18. #18
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,487
    My Cars
    1983/84/85 745i

    Thumbs up

    Dash looks great!

    I wish I had known you were going to go through that heater box, late cars have a more efficient evap core!

    Did you replace the blower resistors while you had it all apart? What about heater core hoses? Test all the pods?
    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



  19. #19
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    It will be coming back apart for the pod replacement. I should be able to do it in a few hours.

    Hoses didn't get replaced yet. They don't look bad at all.

    I did order new floor mats from the dealer for $100 in black.
    pods should be here in a few weeks.

    Hit Man - this is my first 745 so I don't really know most of the tricks and stuff or when most of the updates happened. If I have to redo a few things it won't be the end of the world though. Thanks for the tip on the evap! i'll be rebuilding the a/c system in a few months before the heat hits. I'm going to go out of my way to make a badass a/c system for this thing. I'll take some outside photos of it tomorrow.

    I did add in the extra ground for the solenoids though. (no more clicking sounds!)
    Last edited by DevInAz; 02-01-2012 at 11:52 PM. Reason: Automerged Doublepost

  20. #20
    Join Date
    Feb 2005
    Location
    Herriman UT
    Posts
    1,660
    My Cars
    81 323i 86 535i 08 335i
    My 745i is in St George, would you like to take it apart?
    80 B6, 81 & 82 323, 85 745i, 86 535i-all euro. 01 750iL Blk/Blk 08 335i

  21. #21
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    Sorry for the slow updates guys we've been really busy at the shop and my projects keep getting pushed back. I have found someone to do the full interior including front and rear seats only. I asked them to install all new foam but especially in the front seats on the bolsters to give them more of a sport seat feel. This weekend i'm going to finish my left over projects including my transistors for my final stage and putting all the misc pieces back in the interior.

    The dealer ordered me e32 floor mats not e23 like they were suppose to. Now i'm stuck with these.

    Bimmerboyz - email me at Southwestbimmers@gmail.com
    Last edited by DevInAz; 02-07-2012 at 10:32 PM.

  22. #22
    Join Date
    Mar 2006
    Location
    Sacramento, CA
    Posts
    935
    My Cars
    87 535i/84 €735i/8
    That dash looks the business. Wicked cool. $350 is a bargain. Though the transition at the bottom third of the cluster area is a little awkward..

    Are the wood covers on the rear ashtrays a 745 only thing? I wants some.

    So many little things to learn about this chassis, coming from the e28 world.
    --Jay3->Sic gorgiamus allos subjectatos nunc
    84 €735i manual, 88 528e/i
    Motronic 1 and 1.3 wiring
    Transmission & Diff gearing sheet

  23. #23
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,487
    My Cars
    1983/84/85 745i

    Thumbs up

    Quote Originally Posted by Jay535is View Post
    That dash looks the business. Wicked cool. $350 is a bargain. Though the transition at the bottom third of the cluster area is a little awkward..

    Are the wood covers on the rear ashtrays a 745 only thing? I wants some.

    So many little things to learn about this chassis, coming from the e28 world.


    Well, 745i with buffalo hide had them. So I would GUESS 735i with the 'executive' trim would have them too. They do pop up like that, but super rare.
    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



  24. #24
    Join Date
    Mar 2004
    Location
    las vegas
    Posts
    338
    My Cars
    85 745
    Does any one have a good wiring diagram for my blower motor and HVAC? I'm having problems with an intermitent blower motor. I installed new transitors in my housings. It was working well for a day and now its kinda working sometimes and not others.

    Ideas? Common failures?

  25. #25
    Join Date
    Jun 2010
    Location
    TX
    Posts
    4,487
    My Cars
    1983/84/85 745i

    Thumbs up

    I do, thank me later.....







    I make E23 parts.
    09/1983 745i (stolen spring '13 around Houston, TX Achatgruen on nutria buffalo. 8481080)
    10/1984 745i
    11/1984 745i
    11/1984 735i (10:1-265/6)
    Ford, MB, and GM round out the pack.



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