[Vinboo]

Hi guys, I owned a 325i with a N52B25 and ZF6 gearbox. Just a few months ago, the engine block was cracked and coolant got leaked into cylinders which causes serious misfiring. Due to that, the mechanic suggested me for a engine swap and so I did it. But instead of swapping another B25 into it, I got a N52B30AF. After the swap, the car behaving weirdly (not rough idling) without error codes such as:

1) inconsistent lost in power, usually at <4k RPM (It feels like the engine is farting and no power coming in when stepping on the paddle, but doesn't happen all the time)
2) heavy jerk when gear change (never happened before swap)
3) extremely high fuel consumption (15.2L/100km)

Most of the parts were also changed to new OEM parts such as Spark Plugs, Coils, Valvetronic, both Disa Valve, Air Mass Meter, Throttle Body and Fuel Pump +Filter.
For gearbox part, new clutch pad, mechatronic valve was flushed and cleaned.

After some research, I suspect the problem was caused by the 325i software does not really match well with the B30 engine? If thats really the case, I know that there is plenty of 330i software can be found in Bimmerlabs but most of them are 325i/328i 3.0l -> 330i. In my case, I am from 325i 2.5l -> 330i 3.0l, so my question is:

1) I not sure is it okay to run those same file into my DME (MSV80)
2) Most of them are N52B30 + GM gearbox, does different gearbox effect the engine software?
3) Have anyone experience any weird problem like mine that may not cause by engine software?

Btw, my English may not be good, so if there is any weird sentences, I am really sorry abt that.

[3PedalJake]

Welcome Vinboo. The 325 to 330 is for the MSV70 DME it won't flash onto a MSV80. The 328i to 330i is for the MSV80 I believe, that would have a better chance of working. I have a N52B30 MSV70 325i so not sure.

[ptpending]

there were plenty of 325 with MSV80 outside of the US and EU.
the TS need to virginize his own MSV80 and code it and CAS and to B30 later
also the gearbox reflash and recoding may require

[Vinboo]

Originally Posted by 3PedalJake

Welcome Vinboo. The 325 to 330 is for the MSV70 DME it won't flash onto a MSV80. The 328i to 330i is for the MSV80 I believe, that would have a better chance of working. I have a N52B30 MSV70 325i so not sure.

I think maybe that because you are having a N52B30 in it? I assume that u are having the silver top version on your 325i right?

[Vinboo]

Originally Posted by ptpending

there were plenty of 325 with MSV80 outside of the US and EU.
the TS need to virginize his own MSV80 and code it and CAS and to B30 later
also the gearbox reflash and recoding may require

Cnt I just flash one of these stock 330i file into my current MSV80?

[ptpending]

if this your daily car i would recomment get a spare used msv80 from ebay and experiment on it

[Vinboo]

What if i go to nearby performance shop for a custom tune? Would it be better? Because the current ecu works were not spoiled or burnt, doesn't really feels logical to get another MSV80 just to try it out myself 🤔