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E46 Engine Swaps
Replacing your motor? From direct replacements to more exoctic engines, if it's going under the hood of an E46 3 Series this is the forum to discuss it.

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Old 08-09-2018, 11:05 AM   #1
Chrisbimmer
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Turning 4dr e46 328i into m3

Hi all,
Rather new to the world of bmw, but getting a 328i e46 for next to nothing, and was interested in doing a engine/trans swap from the regular 328i stock to m3 engine&6speed manual. Although I am not the most knowledgeable about cars, my father is a very experienced mechanic and is willing to help. Money isn't really a concern here since I'm getting it for free and I know where to get the M3 parts... how difficult is it to achieve this/ does this project seem realistic?
Cheers.
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Old 08-10-2018, 08:04 AM   #2
markusmarkus
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Unless youíre very familiar with bimmers, I recommend that you donít try the swap. Your car is wired for the M52 engine family. The S54 engine uses very different wiring setup. I have a friend who swapped an S54 into an E46 that had the S52 engine. Took him 6 months to get it right.
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Old 08-23-2018, 08:56 PM   #3
genius328i
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many people have done it everything mounts up fairly easy their tons of guys on here that will help out and have done write ups on them. me myself has done the swap had headaches with the pedal and throttle actuator but it is fairly simple. Their is more than enough people in this form that can help you in the right direction
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Old 08-23-2018, 09:47 PM   #4
HayWagon
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Quote:
Originally Posted by markusmarkus View Post
Unless youíre very familiar with bimmers, I recommend that you donít try the swap. Your car is wired for the M52 engine family. The S54 engine uses very different wiring setup. I have a friend who swapped an S54 into an E46 that had the S52 engine. Took him 6 months to get it right.
Wait what?
I assume that is a typo, S52s were in the e36.

A 99 328 e46 with a M52TU is wired 99% the same as a M54 equipped e46.
If you have a donor m3, it isn't a crazy custom swap. Gut the donor and shove it in the sedan.
If you only have the motor, youre in for headaches.

Sent from my tractor.
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