BMW 1-Series Forum (F20) 135i - 1Addicts.com > Second Generation 1 Series Forum > 2012 BMW 1-Series Sporthatch (F20) Discussion > Convert 120D to 125D
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      08-12-2019, 04:58 AM   #1
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Convert 120D to 125D

Hello,

Sorry if this is a double post; it's my first post here and I'm looking for a bit of advice. I originally didn't get the 125 because of insurance cost (it was about 2k more) but now I'm a little older I'm looking at trying to cover the gap. For very personal reasons this particular car means a lot to me therefore I'd rather spend more than it would cost to sell mine and buy a 125, converting the car.

I know for sure that my 120 is twin scroll turbo and that the 125 is twin turbo. Now could I just swap the turbos on or are there other parts I definitely 100% need to swap on too? I also assume that I'll need some kind of remap?

Thanks

P.S. I would plan on using genuine BMW parts for this
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      09-21-2019, 10:25 AM   #2
Sean8098
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I'm pretty sure other than the turbo, bits like the injectors, ECU, potentially the oil feed for the turbo. Maybe even the diff to handle the extra power
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      09-22-2019, 04:10 AM   #3
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One way to find out is to spend a lot of time on realoem.com and check every single part to see if it's different between the 2 engine types. (Like already said; turbo, injectors, exhaust, pistons, etc etc)

And yes, the engine management will have to be changed. But you might be able to flash the ecu to stock 125D if you actually do a complete "original parts upgrade".

Isn't a complete engine swap (rebuild or lower mileage) a better option?
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