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Old 05-08-2006, 11:16 PM   #1
mikiro80
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motor & tranny swap 318i

Ok first and foremost i have tried to search in the forum but i have been unable to get the info i need. I just got a fairly good deal on a s52 from a 97 m3. This beauty will soon be calling the engine bay of my 318i home. if anyone knows where i can find a writeup or parts list detailing what is needed to do the swap into a obd2 318i chassis i would greatly appreciate it.
i already have a big brake kit W/ stainless stell lines (e46 330ci), upgraded suspension (TMS sways, bilstein & h&r suspension, x brace), new frt control arms. new tie rods, and a transmission from a 98 328i (zf). BTW my 318i is a lowly slushbox right now. the only part i know i definately need right now is a new clutch.
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Old 05-09-2006, 12:16 AM   #2
Justin e36
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a few parts to start your list:

- rear subframe
- differential
- drive shaft (including flex disc)
- clutch
- ECU
- wiring harness
- radiator
- engine mounts

a lot of hoses/reservoirs will need to be relocated in the engine bay, as the 4 and 6 banger layouts are different. (i.e. power steering fluid reservoir, brake booster, etc.) These are all things that would not need to be done if you were upgrading from a m50/m52 to a s50/s52.
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Old 05-09-2006, 12:36 PM   #3
mikiro80
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Quote:
Originally Posted by Justin e36
a few parts to start your list:

- rear subframe
- differential
- drive shaft (including flex disc)
- clutch
- ECU
- wiring harness
- radiator
- engine mounts

a lot of hoses/reservoirs will need to be relocated in the engine bay, as the 4 and 6 banger layouts are different. (i.e. power steering fluid reservoir, brake booster, etc.) These are all things that would not need to be done if you were upgrading from a m50/m52 to a s50/s52.
1st thanks for replying.
why would i need a new rear subframe?
i have everything else in the list except a new radiator & the engine mounts. i cant seem to locate a difinitive answer as to which motor mounts are better/recommended. i also need to get a new clutch but i may just reuse the old one from the 328i transmission i got to save cost for now.
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Old 05-09-2006, 03:32 PM   #4
Justin e36
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The 328i clutch should be fine.

You'll need a new rear subframe because the larger m3 (or 325/328 for that matter) differential will not fit in the 318i subframe. I also HIGHLY recommend reinforcing your rear subframe while you're in the process of replacing it. There's a lot of information in this thread about reinforcing your subframe: http://www.maxbimmer.com/forums/showthread.php?t=67211

As for engine mounts, it depends on your preference really. OEM M3 engine mounts will be fine, but will wear out years down the line. Some people prefer the more expensive urethane engine mounts, at the expense of more vibration/engine noise transmitted to the vehicle.
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Old 05-09-2006, 06:45 PM   #5
318topless
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motor swap

k guys thats the swap i'm doin now, 318ic, to 325 motor, i've changed everything i took all the parts i need from a car that was salvage from the rear end, but the problem is the cars not running right, it revz' up and down by itself, if someone could call me or even lemme know whats the problem that would be greattttt.
416-357-5055
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Old 05-11-2006, 12:38 PM   #6
318topless
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motor swap

bump n e 1?
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Old 05-11-2006, 02:20 PM   #7
xBMWx
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Do a search on the E36 section. Justin had explained how to solve this problem many time!
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Old 05-11-2006, 05:24 PM   #8
bmdbley'sBro
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Quote:
Originally Posted by 318topless
but the problem is the cars not running right, it revz' up and down by itself, if someone could call me or even lemme know whats the problem that would be greattttt.
416-357-5055
I had reving up & down was a bad 02 sensor.
could also be a vacume leak though..
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Old 05-12-2006, 12:32 AM   #9
318topless
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reving

k the reving stopped by itself now ya i dunno don't ask, but now the car takes a couple trys b4 it starts, n e 1
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