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E30 m20 into E28

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  • packratbimmer
    replied
    I think the pan and harness are different. Don't quote me, but you might need a super ETA harness if your engine is an M20B25. Also, the eta would be the way to go in the E28 due to weight. I suspect that driveability would be a little compromised in an E28 with a M20B25 due to the torque curve. You could certainly dial it in with the differential ratio which might need to be 3.91 or 4.10. With that said, the car would weigh about the same as an iX or a cabrio so it obviously can be done - its just not going to feel fast. Eta engines are great for comfortable/pleasurable driving with plenty of low end grunt, but do not expect to crank one out to 120 MPH in the desert. Another thing is that the E28 had a wide range of differential ratios so the gearing might have to be changed depending on the specs from factory.

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  • JeLani
    replied
    In for info as well. I’ve tried looking it up . Its do-able for sure.

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  • packratbimmer
    replied
    Do you have an eta, super eta or 325i engine coming out?

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  • KyleE30
    started a topic E30 m20 into E28

    E30 m20 into E28

    In the process of pulling my m20 out of my e30 to put an m52 in and recently came across an e28 that has everything but the engine and trans for a sweet deal. Is throwing the e30 m20 into the e28 as simple as plopping the motor in and plugging it in or what's all required for this simple swap?
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