2.8L to 3.5L
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- Posts: 65
- Joined: Fri Jun 26, 2015 3:29 am
- Location: Fresno, CA
2.8L to 3.5L
I have a question for the two lads who wrote the article on the 2.8-3.5l conversion. I saw that you said the 89 and up 3.5L needed extra things. Can someone elaborate on what is needed? I took a complete 3.5L out of a 1989 735i among with harness and motronic and the clutch kit out of a ‘87 535i. What else do I need? All feel to chime in. Thanks guys
Re: 2.8L to 3.5L
I didn't write it but it probably refers to the mounting bosses on the block and the need for a different motor mount bracket. I know that's an issue with E28s although they use different points than E12s. Koala Motorsports has adapters for E28s but those are different than E12s of course. Might be worth a call. IIRC the right side mount is the only one that's a problem.
http://www.bmw-stuff.com/proddetail.asp?prod=m30r
http://www.bmw-stuff.com/proddetail.asp?prod=m30r
Mike W.
1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
Re: 2.8L to 3.5L
The Koala adapter will work great. My 88 b35 didn’t need the adapter but an 89 will.
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- Posts: 65
- Joined: Fri Jun 26, 2015 3:29 am
- Location: Fresno, CA
Re: 2.8L to 3.5L
So is the motor mounts what’s different or is the actual bolt pattern to the block different between a 1988 and 1989? If it’s just the motor mount that’s different then can I just get the mount from a 1988 or older and bolt it up to my block? Also thanks for replying
Re: 2.8L to 3.5L
The lugs on the block are missing in two places on the 89 so a stock bracket is not secure. The adaptor uses a nearby lug to add strength.
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- Posts: 65
- Joined: Fri Jun 26, 2015 3:29 am
- Location: Fresno, CA
Re: 2.8L to 3.5L
Aside from the motor mount brackets, is there anything else I need to have?
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- Posts: 65
- Joined: Fri Jun 26, 2015 3:29 am
- Location: Fresno, CA
Re: 2.8L to 3.5L
To add to my previous question, is the a different ECU between automatic and manual transmissions on the M30B35 engines? I pulled the engine and ecu from a 735i auto but I plan on using the 5spd from a 535i. Will my 735i ecu work or will I have to use a ecu from the 535i?
Re: 2.8L to 3.5L
I would look up the part number of the ecu in RealOEM.
Re: 2.8L to 3.5L
I don't believe so. Everything you wanted to know and more about the swap is here, https://www.mye28.com/viewtopic.php?f=3&t=60306Vintagemotorwerks wrote: ↑Sun Aug 30, 2020 2:04 pm To add to my previous question, is the a different ECU between automatic and manual transmissions on the M30B35 engines? I pulled the engine and ecu from a 735i auto but I plan on using the 5spd from a 535i. Will my 735i ecu work or will I have to use a ecu from the 535i?
Mike W.
1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
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- Posts: 65
- Joined: Fri Jun 26, 2015 3:29 am
- Location: Fresno, CA
Re: 2.8L to 3.5L
Thank you mike!!!