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Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 03-09-2011, 08:17 AM   #1
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Join Date: Jul 2009
Location: South Carolina
Posts: 41
My Ride: 2002 BMW 330Ci
Question M54B30 rebuild or build S52B32...?

i have a '02 330Ci. The M54 powerplant she has is getting high mileage cause i use her as a daily driver. But i recently got me another daily driver and im parking my sweetie in the garage lol Its gotten high mileage cause she has been a daily driver its almost 140,000 now i would like some other guys opinions on what to do... I debating on whether to buy this S52B32 i can get a hold of and build it on an engine stand.. or i could drop the M54 out and completely rebuild it... any suggestions on which would be best? which one i could get more N/A power out of? I thought of maybe boring and/or stroking the M54 but not sure... maybe later down the road i might s/c the motor to but I'd like to run it N/A for a long while first. So opinions on better bang for my buck, which motor would be better for the FI, and so on..
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Old 03-09-2011, 03:32 PM   #2
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Join Date: Mar 2006
Location: Southern California
Posts: 26,179
My Ride: Lexus
So you're going to put an S52B32 in your E46 330ci? Good luck. Also your reasons for wanting to rebuild your M54B30 is because it has 140,000 miles?
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Old 03-10-2011, 08:28 PM   #3
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Join Date: Aug 2009
Location: gross deutsches reich USA
Posts: 958
My Ride: 323i with S54
140 000 miles on M54 is nothing. Main problem is gaskets, they are junk and leak after about 5 years. Don't use gaskets on timing cover, oil pan, rear seal cover. Use ultra gray silicone alone and use front and main seals from M50 engine
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Old 03-11-2011, 10:06 AM   #4
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Join Date: Nov 2010
Location: Ohio
Posts: 143
My Ride: 02 325i
Like said 140k is breaking that motor in. Forged crank and rods mean it's a strong motor. Why use the front and rear main seal from the M50 though?

(OO=(||||) (||||)=OO)
2002 BMW 325ish - Soon to be slammed, blackened, blown, and still daily driven

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Old 03-11-2011, 10:09 AM   #5
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Join Date: Aug 2009
Location: St Louis, MO
Posts: 3,008
My Ride: 01 330x-xi
don;t be a dummy leave that m54 alone turbo ethanol thicker head gasket done.
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330ci swap, m54, motor swap, s52

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