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    525 ECU question

    I pulled my ecu to check and make sure it was a 153 before I purchased a 173 and to my surprise it's a 525. So I suppose this is a newer ECU and hence is 1.3 motronic but i'm not sure. Can somebody give me the run down about them?

    #2
    there is no big difference in E30 or E34 ECU's cause they're both M20 powered
    (E34 till 1993 euro version) I'm running also the E34 ECU without troubles ( 381)
    Mot. 1.3

    1989 E30 318iS_______________________________1989 E30 325iC M-Technic I
    1997 E36 328iT
    1990 E30 325iT 24v SOLD
    1989 E30 325i 2.7i M-Technic II SOLD

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      #3
      I know that the 5er's had M20's until 93, but my ecu # is actually 525.

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        #4
        0-261-200-525 ECU's were found on later model E30 325i's and E34 525i's (M20). It's Motronic 1.3, pretty much the same thing as a 173 or 380 ECU.

        '86 325 2.8i stroker - Arctic Blue
        '11 328i Sports Wagon - LeMans Blue
        Strictly Eta

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          #5
          That's what I was thought but just wanted to be clear. I thought it strange to find one in an '87 325is though.

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            #6
            yeah you should be fine. I have a 526 :P
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            Bimmerlabs

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