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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 08-12-2012, 07:03 AM   #1 (permalink)
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325e and I

Has anyone ever swapped an ecu from and I to your e? and the maf would it swap over and would this make any differance in performance?
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Old 08-12-2012, 01:30 PM   #2 (permalink)
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Are they both an M20B25? If so, the ecu is simple to swap. Its in the right side of the vehicle under neath the top cover in the glove box
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Old 08-12-2012, 02:32 PM   #3 (permalink)
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no the E is a 2.7 was just curious since the I has more power if it would make any differance in the way it thinks its getting fuel/air etc...
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Old 08-12-2012, 02:46 PM   #4 (permalink)
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no the E is a 2.7 was just curious since the I has more power if it would make any differance in the way it thinks its getting fuel/air etc...
I dunno, I know a 2.7 is bigger in some way mechanically. I think it has larger bores
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Old 08-12-2012, 11:20 PM   #5 (permalink)
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The M20 2.7 'eta' was designed with increased displacement and lower revving, torque enhanced I6 to offer a higher fuel economy model at the expense of some performance.
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Old 08-13-2012, 02:13 AM   #6 (permalink)
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The M20 2.7 'eta' was designed with increased displacement and lower revving, torque enhanced I6 to offer a higher fuel economy model at the expense of some performance.
that explains why it has a lower redline than my E30 with the 2.5 litre. That means, since it has more torque, it has not a bigger bore like I origionally thought, but a longer stroke. HA! NOW I know how to build a 2.9 litre stroker! YAY!
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Old 08-21-2012, 03:03 AM   #7 (permalink)
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The e model has a rev limiter to protect the weaker e model valve train.
A good upgrade is to switch out the head from an i and start from there.
Check out the difference between the two heads.
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