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WorkmanE30 12-02-2009 07:29 PM

E30 325E 2.7L to 2.5L Swap
Hey was wondering if anyone could tell me some of the things i might need, or some problems i might face with the swap. I'm thinking of the M20B25, Or was thinking about the E36 M50. I would appreciate some feed back! thanks!

Dissembler 12-02-2009 09:05 PM

search... there are a million threads on how to swap m/s5x engines into e30s.

SamE30e 12-02-2009 10:44 PM

njansenv 12-03-2009 01:03 PM

I just swapped an '89 M20B25 into my '87 a couple weekends ago. EASY swap: use the ECU and harness from the M20B25, and it'll start up without any splicing. Some odds and ends do need work: 3 wires I think had to be spliced to get the tach and eco-meter to work.
Overall, if I was swapping only for performance I think I'd be looking at an M52 or better, frankly. If you intend to keep the car for a long time, the cost isn't that much different. Alternatively, I'd consider really depends what you're looking for.

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