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Old 12-02-2009, 07:29 PM   #1
WorkmanE30
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Join Date: Dec 2009
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Question 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!
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Old 12-02-2009, 09:05 PM   #2
Dissembler
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search... there are a million threads on how to swap m/s5x engines into e30s.
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Old 12-02-2009, 10:44 PM   #3
SamE30e
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91 318is - M50NV (gone)
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Old 12-03-2009, 01:03 PM   #4
njansenv
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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 boost...it really depends what you're looking for.
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1998 328i "M-tech"
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Gone: '99 M3 vert, '98 M3 sedan, '91 E30, '89 E30, '87 E30, '91 Euro M5, '93 6-speed Corvette, STI v8 swapped '98 Impreza, '73 2002, 2004 325iT
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