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Old 05-23-2006, 10:38 AM   #1
mikiro80
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Help: who has done a m44 to s52 swap

Hey i need some help desperately. i'm in the process of swapping in a s52 motor into my 97 318i. i'm also swapping in the transmission from a 97 328i. I have read numerous posts from ppl that have swapped in s52's but most of them went from m52 to s52. i was wondering what you guys had to change in order to complete your swap. i have the harness & ecu for the motor & i have the instrument cluster as well. what else do i need to prevent any unnecessary headaches during the swap process? any help will be greatly appreciated.

note: i am doing a full auto to manual swap at the same time and i have already upgraded my brakes & suspension.
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Old 05-23-2006, 11:26 AM   #2
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I would strongly consider swapping out the rear end. Gearing for your set-up is wrong. Go with a 3:15 or 3:23 LSD for sure. Will be really happy with that. Also don't forget you will need a larger radiator for your new set-up. Make sure you put cash to the side beside little things will come up during the swap. Relocating plumbing, replacing old things with new ones ie. mounts, etc.

Good luck.
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Old 05-23-2006, 12:47 PM   #3
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im quite sure Mark (Furious) swapped an S52 into his 318. oh, and he also went ahead and supercharged it im not sure if he's got an S50 or an S52 in there - but either way, he started with a 318 and popped an M3 engine in.
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Old 05-23-2006, 01:07 PM   #4
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I believe you have to chnage your engine mounts and its a good idea to reinforce your rear with plates
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Old 05-23-2006, 01:24 PM   #5
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BennyL, furious' car started as a 325. Then he modded it. then he put an s50 in. then he modded it some more. then he put a AA stage 1 kit on it. then.. well, im not quite sure what he'll do now, but we can probably guess

318->m3 motorswap? A lot of people on bf.c have done this. so has adriano on max. New rad forsure, new diff. new diff will require new driveshaft. its true that you could bolt it up to your old diff, but you'll blow it up vrrrrrrrrrrr quickly. Im assuming you're swapping everything, with the harness right? If so, it probably wont be too bad.


oh yeah, s52 exhaust is 2 in 2 our, 318 is 1 in. So time for a new exhaust too
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Old 05-23-2006, 01:33 PM   #6
mikiro80
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i actually just purchased a complete used m3 exhaust so that is taken care of. i also have the diff that came with my 328i transmission so i'm swapping that in at the same time.
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Old 05-23-2006, 01:34 PM   #7
mikiro80
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Quote:
Originally Posted by bimmer318ti
I believe you have to chnage your engine mounts and its a good idea to reinforce your rear with plates
do i need to swap the mount locations or just the rubber mounts themselves.
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Old 05-23-2006, 01:44 PM   #8
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Quote:
Originally Posted by mikiro80
i actually just purchased a complete used m3 exhaust so that is taken care of. i also have the diff that came with my 328i transmission so i'm swapping that in at the same time.

I would strongly consider getting a LSD diff. The 328 (if stock) is an open end diff with 2.98 gearing ratio. Seeing is the diff is already out why not save the cost on labour by doing it now because trust you will want to down the road.

As for the mounts no you dont have to swap the location but you need a more robust mount to handle the new weight of the motor.

Also something else came to mind. If you have upgraded your suspension I hope you keep in mind that you where doing the swap. If you drop in the M motor there is more weight then your stock 318. So if you suspension was set-up for the 318 be prepared to have your front suspension fail on you alot faster.

With the amout of cash your going to drop on this project you should have sold the 318 and just bought an M
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Old 05-23-2006, 02:20 PM   #9
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you asked this same question a few weeks ago...
http://www.maxbimmer.com/forums/showthread.php?t=71070
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Old 05-23-2006, 03:13 PM   #10
mikiro80
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i previously asked about the parts necessary. i started this thread b/c most of the info i got did not address the necessary headaches associated with a 4-6 cyl swap.
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Old 05-23-2006, 03:29 PM   #11
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Swapping an s52 into a 318 is no different then swaping any e36 6cyl into a 318.

As a note, the 328 tranny is identical to the M3 tranny.
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Old 05-23-2006, 04:23 PM   #12
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How about swapping a s52 into a 94 318, I heard obd1>obd2 swap is much harder
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Old 05-23-2006, 07:22 PM   #13
mikiro80
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Quote:
Originally Posted by thinair
Swapping an s52 into a 318 is no different then swaping any e36 6cyl into a 318.

As a note, the 328 tranny is identical to the M3 tranny.
i know its no different..its just that most of the info i find is from ppl who went from a m52 (6cyl) to a s52(6cyl). my question was asked to determine what particular headaches, changes needed to be made to go from a 4cyl to a 6cyl.
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