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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 06-28-2019, 03:12 PM   #1
E46330iAJ
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M54 3.0 to 2.5 Swap Will it work

I have a 2004 Bmw 330i that has a blown head gasket and I have a 2.5 from a 2001 wrecked Bmw that I want to put in from my understanding the 2.5 will run but I need to recode the DME
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Old 06-29-2019, 06:24 AM   #2
Effduration
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Haven't done it - Have swapped 3.0 to 3.0 but it should work. Intake and MAF are different. I would do the swap and use the 3.0 intake, harness, throttle body, MAF and see how it runs. then I would reflash the DME.

Consider rebuilding your 3.0.. those engines are a dime a dozen now, but won't be in a few years.
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Old 06-29-2019, 07:16 AM   #3
armenh7
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Yes, a 2.5 will swap in perfectly fine. You'll just need to flash the DME to the correct software. Since you have a 2004 and the donor car is 2001, there are some things you'll need to swap over. The valve cover is different, the coil packs are different, the intake air temperature sensor is moved to the maf sensor, and of course the maf sensor is different.
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Old 06-29-2019, 09:54 AM   #4
E46330iAJ
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Quote:
Originally Posted by armenh7 View Post
Yes, a 2.5 will swap in perfectly fine. You'll just need to flash the DME to the correct software. Since you have a 2004 and the donor car is 2001, there are some things you'll need to swap over. The valve cover is different, the coil packs are different, the intake air temperature sensor is moved to the maf sensor, and of course the maf sensor is different.


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