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Thread: Flywheel/clutch for Getrag 260/6 transmission on M30B35

  1. #1
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    Flywheel/clutch for Getrag 260/6 transmission on M30B35

    Long story short... I bought a manual E32 and will be swapping the engine & transmission (Getrag 260/6) into my '89 635csi that has a seized engine and auto transmission. I'm pretty sure the E32's came with a dual mass flywheel and the overwhelming majority of people say to go single mass.

    What is the best single mass flywheel and clutch that will work for an M30B35 and what clutch works with it? I don't know if this is an E32 question but the setup is going into my E24.

    Edit: Can't forget about the master+slave cylinders
    Last edited by Quasi635; 10-17-2020 at 03:04 AM.
    1989 635csi Auto (manual swap pending) - Salmon Silver w/ Black Interior + Vader Seats
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  2. #2
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    The best IMO.
    http://turbochargingdynamics.com/?wp...ry=m30clutches

    or



    http://www.jbracing.com/flywheel-bmw1.php#e12models

    https://www.partsgeek.com/catalog/19...lutch_kit.html

    Do a search for single mass flywheel. I could not find a lightweight around 17 lbs.
    Don'tgo lower for a street car. Aluminum too light for street. 8.5 lbs. Steel around 17 lbs is best for street.

  3. #3
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    IMHO the dual mass is a lot smoother, also easier on the gearbox, but they do tend to wear out and cannot typically be resurfaced. They also damp down the 'revviness' of the motor, so I avoid them personally. I was surprised when my local machine shop told me they could resurface DM wheels; I might try that option out someday.

    I don't believe Valeo ever sold a single-mass conversion kit for the M30 cars. I think they offer those kits for the M20/M4x/M5x families, but I've never seen one for our big ole' M30s.

    The best flywheel for my purposes is the stock M30B32 single-mass, at about 14# it's the lightest stock 'wheel. I believe that is part 11221270286, also used in the early M5/M6 and most Euro 635CSi. There is also the later M30B34 SM 'wheel, slightly heavier at like 19# but still a great choice (part 11221271463?). Oddly, I've never found a part number on a flywheel, it's hard to confirm that info. Both use the same commonly available clutch kit, 240mm IIRC. I've found SM clutch kits online for like $100ish. Used SM flywheels usually go for under $200. The kits are nice, since you'll get a complete set. No need to worry about the throw-out bearing or clutch slave pushrod matching the flywheel/clutch stack thickness. They also come with a pilot bearing. It's a good idea to replace it. I've attached a pic of the one I found in my donor car.

    Of course, while you're in there, shifter rebuild/rear main seal/giubo/CSB are also good ideas. Project creep does get to be a problem; I skipped a few steps when I put mine back together. I got lucky and I don't regret it.

    Pro tip: take both your flywheel and clutch kit along with you to the machine shop. After resurfacing the FW they can balance the complete assembly as a unit. Be sure you can see their indexing marks if you have this work done...don't ask how I know...
    Also remember that the SM flywheel uses shorter bolts. I re-use those bolts personally, but BMW recommends new bolts every time, along with locking compound.
    I'm sure you'll be replacing the clutch fork pivot pin. I've seen a few brass or alu replacement parts out there too, that's a nifty little upgrade!
    Attached Images Attached Images
    Last edited by DesktopDave; 10-18-2020 at 12:12 PM.
    Save the manuals!
    '08 128i 6MT, '86 635CSi 5MT (B32, Motronic 1.3, WBO2, G265, 18# FW, 3.46 torsen)
    Past projects:
    '96 318iS, sold 4/23 '90 535iM, RIP 1/23 '90 535iA RIP 6/22 '91 318i, sold 7/19 '97 M3 sedan, sold 11/18 '85 735i, RIP 2/18 '92 325iC, sold 7/16 '91 318iS, sold 6/16 '84 745i, sold 10/14 '82 633CSi, traded 9/12 '90 325i, RIP '87 325 sold '89 525i, traded '87 325iS, RIP

  4. #4
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    I appreciate all the detailed info!

    I saw on another forum (for E34's) that they recommend using an E28 flywheel. Considering the E34/E32 were the same and they all use the M30B35 engine I think this is the best way to go. I didn't stop to consider that the M30B34 may be different than M30B32. I'll try to look for pre 85 E24/E28/E23 with that engine. Does that mean I buy a Sach's clutch for that that same model (ex: 84 733i)? I saw a few 85+ flywheels on car-part. Not sure if those guys still have the part for sale.

    I do plan on replacing some other parts in there. I want to get new shifter equipment (bushings, etc). I need to replace the driveshaft so the guibo and CSB are a must. Didn't think about the rear main seal so good call there. My focus has been more on getting the major components sourced so I can then start looking into the minor parts.
    1989 635csi Auto (manual swap pending) - Salmon Silver w/ Black Interior + Vader Seats
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  5. #5
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    Desktop Dave is right on. When I installed my clutch after engine build
    the oem plastic pivot pin disintegrated in my hand.
    Get one like this.

    https://www.bing.com/search?q=BMW+e2...16&FORM=CHROMN

  6. #6
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    https://www.ebay.com/itm/BMW-Flywhee...432a%7Ciid%3A1

    Buy this flywheel in my opinion. Ive purchased from this seller in the past and he is great to work with. He has some hard to find stuff in great shape.

    Get flywheel bolts from an '83 633csi as it was the factory flywheel. Brand new bolts from BMW aren't expensive and are available. I had my flywheel resurfaced recently, and installed the clutch kit from an E28 M5, all onto a 90 M30B35 motor and dropped into my '83. Its a great combination. Throttle response is terrific.
    1983 633csi a.k.a. Wolfie - M30B35 Swap - Getrag 265 - 3.73LSD

  7. #7
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  8. #8
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    good find there! thats a bargain! Turn around time is the only issue I can see there if you are in a hurry.

    Youd be remiss if you didnt put a rear main seal and rear crank shaft seal in the car for the amount of effort you are getting into.
    Last edited by jbd5015; 10-19-2020 at 03:28 PM.
    1983 633csi a.k.a. Wolfie - M30B35 Swap - Getrag 265 - 3.73LSD

  9. #9
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    @1986series6, that seems to be a resurface service and not the part. Does that mean they can take my dual mass and shave it down? I didn't think that was possible.

    @jdb5015, good to see you're still on the forums! I remember way back when you were fixing Wolfie (not that these cars are ever done). I will heavily consider that new part if I can't find a good used one. Time isn't a huge issue but I would like to have the part in 1-2 weeks.
    1989 635csi Auto (manual swap pending) - Salmon Silver w/ Black Interior + Vader Seats
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  10. #10
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    Irelands wheel calls for a core and is a lightened stock fly wheel which I wouldn't fool around with. Mesa Performance, the seller on Ebay, are known good guys and excellent parts providers and if you do go new they are the go to guys. I would contact them direct if you go that way and get Ebay out of the picture. It will 10% cheaper as Ebay's fee will be off the table.
    81 Euro undergoing total nut and bolt restoration
    pictures at: flickr.com/photos/bertsphotos

  11. #11
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    I reached out via email earlier today but will try calling Mesa tomorrow. I started writing up a parts list and it's getting LONG.

    Main Components
    11221271463 - Single Mass Flywheel - this seems to be the popular one that used to be easy to find
    21219069012 (Sachs Part #) - Clutch Kit https://www.autohausaz.com/pn/21219069012


    Engine/Clutch:
    11227805885 - Flywheel bolts
    07119919939 - Clutch Pressure Plate Bolts (6), AKA 07129903984
    11141250073 - Rear Main Seal
    21511204229 - Clutch Fork
    21511202659 - Clutch Fork Pivot
    11142249533 - Crankshaft Seal
    23128677736 - Transmission Shift Shaft Seal


    Driveshaft related:
    Need to find E24 driveshaft for MT
    26117511454 - Guibo
    26111206502 - Driveshaft Center Support Bearing


    Shifter
    25117503525 - Shifter arm bracket
    25117519669 - Transmission Shift Bushing
    25111220707 - Shift Arm Bushing
    25111220600 - Shifter Bearing
    25111220785 - Shifter Boot Rubber
    25111220439 - Selector Rod Washer
    25117571899 - Shift Rod Clip
    23411466134 - Selector Rod Joint Pin
    25111203682 - Tension Bushing
    25111434194 - Selector Rod Joint Bushing
    Last edited by Quasi635; 10-20-2020 at 01:10 PM. Reason: Removed Clutch Pilot Bearing from list
    1989 635csi Auto (manual swap pending) - Salmon Silver w/ Black Interior + Vader Seats
    2011 535i Auto M Package - Black w/ Black Interior

  12. #12
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    No pilot bearing for the clutch. Should be throwout bearing. Pilot bearing is for the crank shaft
    81 Euro undergoing total nut and bolt restoration
    pictures at: flickr.com/photos/bertsphotos

  13. #13
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    The nice thing about the automatic trans B35 is that it wont have the pilot bearing pressed into the crank, so you wont have to remove an old one!
    1983 633csi a.k.a. Wolfie - M30B35 Swap - Getrag 265 - 3.73LSD

  14. #14
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    The clutch kit comes with the throwout bearing so that's good. Man, this is getting expensive with all these little parts here and there, haha! I haven't found one comprehensive list online on "what to replace" so I hope this list helps someone else in the future. I'll be editing it as needed. Hopefully I'm not missing anything else.
    1989 635csi Auto (manual swap pending) - Salmon Silver w/ Black Interior + Vader Seats
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  15. #15
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    It does add up, unfortunately. The little parts are annoyingly expensive.

    I've occasionally used the tactic of delaying expensive smaller jobs while I knock out the big ones. It's not like an E24 is ever 'done' LOL. I'll be back in there again. Depends on how much you value your time, honestly.

    Another thought: once you've broken all the stubborn bolts loose, and figured out how it all comes apart, the next job takes like half the time...
    Save the manuals!
    '08 128i 6MT, '86 635CSi 5MT (B32, Motronic 1.3, WBO2, G265, 18# FW, 3.46 torsen)
    Past projects:
    '96 318iS, sold 4/23 '90 535iM, RIP 1/23 '90 535iA RIP 6/22 '91 318i, sold 7/19 '97 M3 sedan, sold 11/18 '85 735i, RIP 2/18 '92 325iC, sold 7/16 '91 318iS, sold 6/16 '84 745i, sold 10/14 '82 633CSi, traded 9/12 '90 325i, RIP '87 325 sold '89 525i, traded '87 325iS, RIP

  16. #16
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    I've done a clutch/flywheel replacement on an E46 I used to have. Looking at pictures and parts lists for this project, it's pretty much the same thing except this time I already have the engine/tranny dropped which in theory should make it easier. Of course, last time I wasn't doing a retrofit and already had the shifter linkage/parts.
    1989 635csi Auto (manual swap pending) - Salmon Silver w/ Black Interior + Vader Seats
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  17. #17
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    Does the E32 have a compatible transmission subframe? I hope so, BMWs tend to have very similar transmission tunnel widths, the mounting bolts & rails are similar as well. There's more than a little similarity between the E24 & E32 chassis.

    There have been many different subframes made for the E24, I learned that the hard way...my '81 633CSi (E12 chassis with a 260/5 'box) had a different subframe from the later E28 chassis (260/6 'box). I had a heck of a time tracking down the right part, got it wrong more than once, took a few months to find the right one!
    Save the manuals!
    '08 128i 6MT, '86 635CSi 5MT (B32, Motronic 1.3, WBO2, G265, 18# FW, 3.46 torsen)
    Past projects:
    '96 318iS, sold 4/23 '90 535iM, RIP 1/23 '90 535iA RIP 6/22 '91 318i, sold 7/19 '97 M3 sedan, sold 11/18 '85 735i, RIP 2/18 '92 325iC, sold 7/16 '91 318iS, sold 6/16 '84 745i, sold 10/14 '82 633CSi, traded 9/12 '90 325i, RIP '87 325 sold '89 525i, traded '87 325iS, RIP

  18. #18
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    The motor swap will also throw some extra parts in the mix as well. Youll need to adapt your wiring harness for the motronic 1.3 (ECU 179), as well as additional motor mount adapters as the B35 block has different bolt patterns for the E32/E34. Having just went through all this very recently, PM me for more contact information to help you through if youd like.

    EDIT: Did a little research, and Im hoping that my prior statement is WRONG. Looks like the E24 did come with the Motronic 1.3 in '89. Im just unsure of the motor mount scenario between the E32 and E24.
    Last edited by jbd5015; 10-23-2020 at 09:30 AM.
    1983 633csi a.k.a. Wolfie - M30B35 Swap - Getrag 265 - 3.73LSD

  19. #19
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    Quote Originally Posted by jbd5015 View Post
    The motor swap will also throw some extra parts in the mix as well. Youll need to adapt your wiring harness for the motronic 1.3 (ECU 179), as well as additional motor mount adapters as the B35 block has different bolt patterns for the E32/E34. Having just went through all this very recently, PM me for more contact information to help you through if youd like.

    EDIT: Did a little research, and Im hoping that my prior statement is WRONG. Looks like the E24 did come with the Motronic 1.3 in '89. Im just unsure of the motor mount scenario between the E32 and E24.
    B35 blocks made for E32 and E34 will be different for the E24 applications. The mounting bosses are placed differently. Koala Motorsport should have the correct adapter plates when fitting E32/E34 blocks onto E24 cars. 88/89 B35 did come with 1.3 and need to confirm the correct ECU P/N for hose two years. If I'm not mistaken, I think 88 P/N was even different than 89, but still considered 1.3.
    Looking through some notes, The 150 was used on 1988 US 635's and the 179 was used on 1989 US 635's and E32's and E34's with the M30 engine. Don't forget, the AFMs have to match their associated ECUs as well.
    Last edited by carsnplanes; 10-23-2020 at 12:53 PM.
    '88 635, '92 325IC

  20. #20
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    Quote Originally Posted by carsnplanes View Post
    B35 blocks made for E32 and E34 will be different for the E24 applications. The mounting bosses are placed differently. Koala Motorsport should have the correct adapter plates when fitting E32/E34 blocks onto E24 cars. 88/89 B35 did come with 1.3 and need to confirm the correct ECU P/N for hose two years. If I'm not mistaken, I think 88 P/N was even different than 89, but still considered 1.3.
    Looking through some notes, The 150 was used on 1988 US 635's and the 179 was used on 1989 US 635's and E32's and E34's with the M30 engine. Don't forget, the AFMs have to match their associated ECUs as well.
    The part number 12141748258 "seems" to be the same for the Motronic 1.3 for the 89 635csi and 90 735i (donor car). I was planning on using my original ECU with the original AFM. Where are you getting the numbers 150 and 179 from?

    @jbd5015, you recommended using the ECU from the E32, any particular reason why?
    1989 635csi Auto (manual swap pending) - Salmon Silver w/ Black Interior + Vader Seats
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  21. #21
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    Yep, the E24 did come with 1.3 in late '88 & '89. Apparently some early E32 & E34 blocks have both sets of mounting bosses cast into the block. Those cars may also have differentials with both sets of mounting bosses as well.

    The E24 has some other differences. I believe it also still uses the B34 oil filter housing. I tried to fit the B35 housing in my '85, but it wanted to be in the same space as my ABS pump.

    Lots of other little differences too; I used an '88 1.3 wiring harness on mine. It's different than the E32 harness I've been using. I needed to add a splice in the C101 on the engine side, IIRC the E24 had an extra Motronic power output than the later cars. Of course, you'll need the SuperEta gauge temp sensor. I haven't found anytihng suiteable so we can retain the BMW high-temp warning light. It's an E24 exclusive, apparently.

    The intake manifolds are also different, I had to modify mine to work properly with the Evap valve, the fuel lines, the vac tap and some other stuff.
    Save the manuals!
    '08 128i 6MT, '86 635CSi 5MT (B32, Motronic 1.3, WBO2, G265, 18# FW, 3.46 torsen)
    Past projects:
    '96 318iS, sold 4/23 '90 535iM, RIP 1/23 '90 535iA RIP 6/22 '91 318i, sold 7/19 '97 M3 sedan, sold 11/18 '85 735i, RIP 2/18 '92 325iC, sold 7/16 '91 318iS, sold 6/16 '84 745i, sold 10/14 '82 633CSi, traded 9/12 '90 325i, RIP '87 325 sold '89 525i, traded '87 325iS, RIP

  22. #22
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    Quote Originally Posted by Quasi635 View Post
    The part number 12141748258 "seems" to be the same for the Motronic 1.3 for the 89 635csi and 90 735i (donor car). I was planning on using my original ECU with the original AFM. Where are you getting the numbers 150 and 179 from?

    @jbd5015, you recommended using the ECU from the E32, any particular reason why?
    I'm assuming the E32 was running when you got it, so using the same computer will give you the best baseline for getting the car running. If you run into any other issues with the swap, mye28.com has a M30B35 Swap Thread in their technical section that can be helpful. Fortunately for you, there wont be a ton of wiring differences for your application.
    1983 633csi a.k.a. Wolfie - M30B35 Swap - Getrag 265 - 3.73LSD

  23. #23
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    Quote Originally Posted by Quasi635 View Post
    The part number 12141748258 "seems" to be the same for the Motronic 1.3 for the 89 635csi and 90 735i (donor car). I was planning on using my original ECU with the original AFM. Where are you getting the numbers 150 and 179 from?

    @jbd5015, you recommended using the ECU from the E32, any particular reason why?
    Back to my notes, sometime ago I had compiled notes from a thread on Big Coupe.
    Here is the full list of effectivity for the 150 and 179 ECUs, however I can't confirm that person's source.

    Bosch 150 and 179 (interchangeable as both on the same page)
    BMW 12 14 1 722 314, 12 14 1 722 611, 12 14 1 726 685,
    12 14 1 730 440, 12 14 1 730 697, 12 14 1 738 168
    E30 320i Cabriolet 3/88 - 10/93 (95?) (129 hp) (also touring & saloon)
    E28 535i, M535i 9/86 -12/87 (136?) (185 hp)
    E28 535i, M535i 9/86 -12/87 (192 hp)
    E28 535i, M535i 9/86 -12/87 (218 hp)
    E34 535i, 1/88 - 12/93 (155?) (211 hp)
    E24 635CSi 9/86 - 4/89 (136?) (185 hp)
    E24 635CSi 9/86 - 4/89 (192 hp)
    E24 635CSi 8/87 - 5/89 (211 hp)
    E24 635CSi 6/78(?) - 9/86 (218 hp)
    E32 735i, 735iL 9/86 - 9/92 (211 hp)
    E32 735i, 735iL 9/86 - 12/87 (220 hp)
    (Note: above not identified for catalytic system, automatic, or US model)
    '88 635, '92 325IC

  24. #24
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    Quote Originally Posted by Quasi635 View Post
    The part number 12141748258 "seems" to be the same for the Motronic 1.3 for the 89 635csi and 90 735i (donor car). I was planning on using my original ECU with the original AFM. Where are you getting the numbers 150 and 179 from?

    @jbd5015, you recommended using the ECU from the E32, any particular reason why?
    I'm not sure if I'm understanding your project completely here..are you planning on running the B35 motor with your original Motronic 1.0 parts? I hope not, I don't think that will work. The speed & position senders likely won't mount to the 260 bell housing, the B35 uses a front-mount crank sensor with a trigger wheel on the vibration damper.

    I'd strongly recommend using the B35 engine & electronics as a complete unit. Then add necessary E24 parts onto the B35. In my case, I'm using the B34 accessories, oil pan, exhaust manifolds, oil filter and cooling system.

    The intake manifold, accessory mounts, front cam case & cooling system have some pretty significant differences, it'd be a LOT easier to splice the E32 harness into the E24. I believe the E32 harness is long enough to fit into the E24 cabin. Originally, I used an E34 535i harness, but it was a few inches too short. You'll have to lengthen a few wires for the AFM, otherwise it all worked out just fine.

    I've run a few different variations with my '86 chassis. First version was an '81 Euro high-compression B34 with Motronic 1.3. I ran that for a year, just pulled it to freshen up the valve seals. While that's getting rebuilt, I swapped in an '82 B32. That's also running Motronic 1.3, but from an '89 E24.

    You can't mix and match parts between Motronic 1.0 and the later 1.1/1.3 systems. I'd recommend using the complete 1.3 system. Motronic 1.0 and 1.1/1.3 have significant differences. have compatible injectors, no cold-start injector, etc.). Grab some of the chassis wiring harness from the donor too, then just wire it into your fuse box. The later cars use a large round plug (C101), the earlier cars had a square plug into the fuse box. It's surprisingly easy to splice them together, only like ten wires total. You'll also need a little stub wire from the DME connector, I think that's called the C103 by BMW.
    Save the manuals!
    '08 128i 6MT, '86 635CSi 5MT (B32, Motronic 1.3, WBO2, G265, 18# FW, 3.46 torsen)
    Past projects:
    '96 318iS, sold 4/23 '90 535iM, RIP 1/23 '90 535iA RIP 6/22 '91 318i, sold 7/19 '97 M3 sedan, sold 11/18 '85 735i, RIP 2/18 '92 325iC, sold 7/16 '91 318iS, sold 6/16 '84 745i, sold 10/14 '82 633CSi, traded 9/12 '90 325i, RIP '87 325 sold '89 525i, traded '87 325iS, RIP

  25. #25
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    Quote Originally Posted by DesktopDave View Post
    I'm not sure if I'm understanding your project completely here..are you planning on running the B35 motor with your original Motronic 1.0 parts? I hope not, I don't think that will work. The speed & position senders likely won't mount to the 260 bell housing, the B35 uses a front-mount crank sensor with a trigger wheel on the vibration damper.

    I'd strongly recommend using the B35 engine & electronics as a complete unit. Then add necessary E24 parts onto the B35. In my case, I'm using the B34 accessories, oil pan, exhaust manifolds, oil filter and cooling system.

    The intake manifold, accessory mounts, front cam case & cooling system have some pretty significant differences, it'd be a LOT easier to splice the E32 harness into the E24. I believe the E32 harness is long enough to fit into the E24 cabin. Originally, I used an E34 535i harness, but it was a few inches too short. You'll have to lengthen a few wires for the AFM, otherwise it all worked out just fine.

    I've run a few different variations with my '86 chassis. First version was an '81 Euro high-compression B34 with Motronic 1.3. I ran that for a year, just pulled it to freshen up the valve seals. While that's getting rebuilt, I swapped in an '82 B32. That's also running Motronic 1.3, but from an '89 E24.

    You can't mix and match parts between Motronic 1.0 and the later 1.1/1.3 systems. I'd recommend using the complete 1.3 system. Motronic 1.0 and 1.1/1.3 have significant differences. have compatible injectors, no cold-start injector, etc.). Grab some of the chassis wiring harness from the donor too, then just wire it into your fuse box. The later cars use a large round plug (C101), the earlier cars had a square plug into the fuse box. It's surprisingly easy to splice them together, only like ten wires total. You'll also need a little stub wire from the DME connector, I think that's called the C103 by BMW.
    I have an 89 635 which already has an M30B35 and Motronic 1.3. I want to keep the engine looking as stock as possible to make it easier to get any future parts. This way I can lookup E24 part numbers and continue to order those rather than E24 for this but E32 for that. I think @carsandplane verified that the ECUs should (in theory) be similar. I'll know more once I get all my manual swap parts in and pull the engine from the E32.

    I will definitely compare the harness between the E32 and E24 before doing a swap. I'm not afraid to splice any wires if necessary.

    Hope the project makes sense now. I know there are lots of different years and part numbers being thrown around.
    1990 E32 735i Engine/Getrag 260/6 -> 1989 E24 635csi
    1989 635csi Auto (manual swap pending) - Salmon Silver w/ Black Interior + Vader Seats
    2011 535i Auto M Package - Black w/ Black Interior

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