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Various Questions M50B25 NV

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    #1

    Various Questions M50B25 NV

    Hi all,

    So I bought a M50 swapped 325i a few years ago. Just starting to get around to looking at it.

    I think it was never started since it doesnt have the harnesses spliced together. Issue is, I started looking a little deeper and I found some interesting things.

    There is a 413 ecu in it. I know this is not a good idea. Is there a quick reference for me to check to see if this guy swapped the cam sensor and crank trigger?

    Do I need to run a fan on the engine? Or is an electric fan sufficient?

    Is there a way to find out what production date car the engine came from by the engine serial? That would help me track down a replacement engine harness and ECU.

    Check out this transmission crossmember. Sketchy is not the word.

    "Dolphins aren't so smart, they can't even engineer an E-diff"
    Tags: None
    #2
    So to answer my questions:

    Sensors on engine appear to be regular non-vanos. MAF plug was spliced on to the harness to run the early MAF so its defintely a vanos harness.

    Going to run a SPAL puller fan that the PO graciously left me in a box and remove the mech one. Theres a new rad on it.

    Engine came from an early E36. Trans is a G260 with white325is' crossmember. I'm still not sure about that crossmember though I understand he was the guy for them. Might beef it up a bit.

    Found a 403 ECU on ebay for cheap so I snapped that up. Now I just need a manual E36 non-vanos harness.

    Only cut wires on the body electrics are the ones that go to the missing cruise actuator. I'll have to get a new actuator, I assume the E30 actuator can be hooked up to the E36 TB.
    "Dolphins aren't so smart, they can't even engineer an E-diff"

    Comment

      #3
      I can only help a little bit: Yes, the E30 Cruise Control Actuator can be hooked up to the E36 throttle body.

      Comment

        #4
        Cool, thanks. Every little bit helps. I want this car to be a fully functional E30 on the inside, so I want cruise and AC. There are no AC parts on this engine so its a blank slate, I'll have to get a full new AC setup, but that should mean that it'll work great.

        Now that I mostly know where I'm at, I think I can confidently take the car apart and get to work. Needs some bodywork so I'm going to build a rotisserie and fully strip it. I've got all the steel piled under the car, just need to loan a hoist and call out some buddies to strip the car.
        "Dolphins aren't so smart, they can't even engineer an E-diff"

        Comment

          #5
          I had to do the AC for my M50 swap. My setup was: E36 compressor with E30 everything else. This means that you only have to modify the two hoses going to the compressor. I had a hose shop modify my E30 lines to fit.

          You will also have to adjust your harness to connect to the ac system.

          I used Zionsville Autosport's Project Orca as a guide. They only charged $10 for a lot of technical detail.

          Comment

            #6
            e34's had NV m50's too, but the ECU connector trunk is a little short for an e30.

            That transmission cross-member is actually a well known and proven design. A member here was selling them a long time ago, and now Condor even sells them (I have personally used them in customer cars, never had a failure). When using the G260 trans with a 24v, the trans has to lean over 10°, so the stock ones don't work - however you can use an e36 trans with the stock e30 brace.

            G260 Transmission Swap Brace for 24v Swaps
            https://www.condorspeedshop.com/products/g260-transmission-swap-brace-e30-m50-52-s50-52
            Our G260 transmission swap brace for 24v swap are used for swapping a 24v motor into a BMW E30. Shop our full selection of BMW performance parts and more!
            john@m20guru.com
            Links:
            Transaction feedback: Here, here and here. Thanks :D

            Comment

              #7
              Originally posted by ForcedFirebird View Post
              e34's had NV m50's too, but the ECU connector trunk is a little short for an e30.

              That transmission cross-member is actually a well known and proven design. A member here was selling them a long time ago, and now Condor even sells them (I have personally used them in customer cars, never had a failure). When using the G260 trans with a 24v, the trans has to lean over 10°, so the stock ones don't work - however you can use an e36 trans with the stock e30 brace.

              https://www.condorspeedshop.com/prod...-m50-52-s50-52

              Thanks, I did see that after. This one is the one the member here was making. I suppose the engine mounts are meant to take the majority of the forces, and this one is just to stop the assembly from rotating up and down. Just looked a little weird at first glance. I can just sandblast and POR15 it before it goes back on. Maybe add a little gusseting first, we'll see what I think when I get it off.

              I think I'll get the E36 harness if I can find one, I have a 403 ECU coming now, spotted one on ebay for a good price.
              "Dolphins aren't so smart, they can't even engineer an E-diff"

              Comment

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