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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 06-12-2019, 04:05 PM   #1
simba15
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Join Date: May 2019
Location: Edmonton AB
Posts: 20
My Ride: E46 B30
Year: 2004
Transmission: Manual
MS45.1 B30 Swap

Hi there,

So I am almost completed my engine swap from M54B25 to B30.

This is on a 2004 car that has MS45.1

From all the research I have done it seems that the B30 Engine will run OK on the B25 intake manifold, Injectors and throttle body. (Would prefer to use B30 intake with B25 injectors and TB, but TB wont bolt up.)

This is the only complete setup I have (TB, intake boot, MAF and intake)

Would there be an any issues beyond the slight power loss of this setup?

I am planing to swap to all B30 Components and Flash the ECU with a B30 file (or have BaliDwag do it) but it will take some time to get al the required parts (at an ok price)

Any input or ideas is always appreciated.

Thanks
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Old 06-12-2019, 05:47 PM   #2
HayWagon
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May work ok.

If it was me I'd bite the bullet and get the last remaining parts.

Sent from my tractor.
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Old 06-13-2019, 11:57 AM   #3
simba15
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Join Date: May 2019
Location: Edmonton AB
Posts: 20
My Ride: E46 B30
Year: 2004
Transmission: Manual
I agree unfortunately cant seem to find a MAF for a good price.

Any thoughts if the B25 maf can be used? Would be able to get it ready with what I have.

Thanks
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Old 09-04-2019, 01:23 PM   #4
simba15
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Join Date: May 2019
Location: Edmonton AB
Posts: 20
My Ride: E46 B30
Year: 2004
Transmission: Manual
So had this car running for around 5k km on the B25 injectors and Maf.

Was running well, had tho odd hiccup but ran well overall

I swapped in the 3.0 Injectors and maf and had BaliDawg reprogram the ECM.

Unfortunately, with this new setup, the car idles ok but under mild acceleration, it hesitates and misfires.

It runs great on the highway!! I can feel the power difference in the top end but under 3000 it seems very unhappy.

No codes except for cat and SAP delete.

did a smoke test and found a few small leaks, fixed them but still the same issue.

Any ideas where to start? I really contemplate going back to the 2.5 setup.
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