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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 12-09-2003, 07:25 AM   #1 (permalink)
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Hey guys long time no call... Just had a quick question, I have an 89 325i conv. My engine just went to shit, it had a small knocking a year ago and it turned into an ugly loud knocking a month ago, I purchased an engine from a 91 325is for 350.00 which I started swapping over this past weekend. The engine is out and I'm just transfering everything over to the new one... my question is, is this engine going to work with my own ecm? Also I saw on the head of my old one that is has a "2.5" molded into the side of the head and the new one has a "2.5 and a 2.7 right on top of the 2.5, is this gonna make a big difference on my performance of my car? This is only FYI for me, just need to know if I'm going to have to buy a new ecm or not... thanks fellow e30 freaks... have a good one.
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Old 12-09-2003, 07:41 AM   #2 (permalink)
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you should see what the ecu # was on the 91 just to verify. there shouldnt a big power difference unless your last engine was in poor shape for a while
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Old 12-09-2003, 07:59 AM   #3 (permalink)
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Well my car is a testimony for BMW engineering, I drove my car about 40 miles on the bad engine at 80 mile per hour on 5 cyl. But the car ran strong it just wounded like me piston was going to puncture through the block at anytime. But I need to get the number to the ecm from that car to compare... thank you sir for the 411.
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Old 12-09-2003, 06:45 PM   #4 (permalink)
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it's referred to as ECU, not ECM

and the reason why there's a 2.7 stamped on the block as well is beacuse there was also an m20b27... or a 2.7L m20... ie the ETA engine (the engine in the 325e, 325eS and 325)... they shared the same block, but the eta had a longer stroke
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Old 12-10-2003, 05:09 AM   #5 (permalink)
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Thank you Oreo, sorry for the confusion... . Well I know the difference between the I and E 2.5 and 2.7. But my initial question was will I need to buy the "ECU" from the "is" for my car to run properly. I hace access the the "ECU" to purchase, please help me because I will install the engine this weekend and so that I can have time to buy it.
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Old 12-10-2003, 07:52 AM   #6 (permalink)
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Originally posted by flipsgonetopless@Dec 10 2003, 06:49 AM
Thank you Oreo, sorry for the confusion... . Well I know the difference between the I and E 2.5 and 2.7. But my initial question was will I need to buy the "ECU" from the "is" for my car to run properly. I hace access the the "ECU" to purchase, please help me because I will install the engine this weekend and so that I can have time to buy it.
if you have access to it, deffinately ask the seller what the last 3 digits of the ecu are
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Old 12-10-2003, 03:45 PM   #7 (permalink)
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if you setarted w/ an m20b25 (325i/325iS/325iX engine) and you're swapping to another m20b25, you shouldn't need a new ECU... but if the ECU you have now is motronic 1.1 & you have access to one that's motronic 1.2, i wouldn't see why you woulnd't swap em.... but i'm not sure if they're a direct plug & play upgrade... your best bet is to get the last three digits like MrM3 said
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