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Discussion Starter #1
Hi all. Did a swap to a 2.8 but i have to reuse the 2.5 ecu/dme, I can't find a flash file anywhere for a 2.8. Any help with the 528i flash file would be greatly appreciated. Thanks
 

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Discussion Starter #4
Hi, thanks for reply. My ecu is ms43, its m54 intake manifold. 2.8 stamped on the block. It was from an e39 by the way.. How can u tell the difference m52 and m54.. Could i flash m52b28 file onto my ms43? Thanks again.
 

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well, the engine is 100% M52 but what about the ancillaries? did you keep your original harness/maf from M54B25?
if you did so, you can use your 525 ECU as is and tune it a bit.
you cannot flash M52B28 file in MS43.
 

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Discussion Starter #6
Ya harness and maf and whole intake from m54 325., iv no exhaust sensors at all just to add. Also I'm not great with the tuning side of it. Iv done the 2.5 ews delete flash but that's about it
 

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well, the engine is 100% M52 but what about the ancillaries? did you keep your original harness/maf from M54B25?
if you did so, you can use your 525 ECU as is and tune it a bit.
you cannot flash M52B28 file in MS43.
Could I flash the ms43 b30 file and tune it back a bit. Or if I was to add supercharger and plenium intake with bigger injectors, do u think I could tune it myself to run good. At the moment it's idling OK but lacking power driving on the road
 

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the m54b25 file is more suitable for your engine. but of course needs tuning. go to ms4x wiki and try a bit. also logging is necessary.
going ms42 is much more work to do.
 
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