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Thread: Has anyone on here converted from MS45.1 to MS43?

  1. #21
    Join Date
    May 2012
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    Northern Michigan
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    485
    MS45.1 can be tuned for forced induction, several companies have done it, ESS, AA, TT, etc. But, they don't know that DME as well as the MS43, and so there are some challenges when tuning it for higher horsepower. It is rumored that ESS didn't release their TS3 kit for the MS45.1 cars because of some issue they ran into with the DME at those higher power levels, for example.

    Think of it this way:
    MS45.1 - moderate understanding is available, enough to get by, but nothing fancy
    MS43 - its an open book, everyone knows how to do just about anything with it
    2003 BMW 330i ZHP
    ESS Twin Screw Stage 2 - Wavetrac - Headers - Borla - BMW Performance
    Turner Motorsports - Powerflex - Hawk Performance

    Build thread: http://www.zhpmafia.com/forums/showt...yan-s-2003-ZHP
    Wheelwell: 2003 BMW 3 Series
    Fuelly: 2003 BMW 330i

  2. #22
    Join Date
    Jan 2013
    Location
    Florida
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    223
    Quote Originally Posted by rkneeshaw View Post
    MS45.1 can be tuned for forced induction, several companies have done it, ESS, AA, TT, etc. But, they don't know that DME as well as the MS43, and so there are some challenges when tuning it for higher horsepower. It is rumored that ESS didn't release their TS3 kit for the MS45.1 cars because of some issue they ran into with the DME at those higher power levels, for example.

    Think of it this way:
    MS45.1 - moderate understanding is available, enough to get by, but nothing fancy
    MS43 - its an open book, everyone knows how to do just about anything with it
    Thanks for clarifying that. Sounds like its would be worth finding out how hard it is. I want to do high hp turbo kit on my zhp. I would like to try and get 450hp.

  3. #23
    Join Date
    Jul 2014
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    European Auto Source
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    899
    I was planning on 43 for FI down the road. But I want it now for that crackle
    Modification Thread
    Original Car: Silver Grey on Grey, A/T (1 of 186)
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  4. #24
    Join Date
    Jan 2014
    Location
    Dayton, OR
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    Quote Originally Posted by CarbonZHP View Post
    I was planning on 43 for FI down the road. But I want it now for that crackle
    I second that! Can't wait!


    Sent from my iPhone using Tapatalk

  5. #25
    Join Date
    Jun 2013
    Location
    Charlotte, NC
    Posts
    1,255
    Really informative vid posted about this on e46f today. This is something thats definitely not in the near future for me but I'm very anxious to follow the progress and see where it goes.

  6. #26
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    Jan 2014
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    Dayton, OR
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    What thread is this video posted in? Very curious!


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  7. #27
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    Charlotte, NC
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  8. #28
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    Jan 2014
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    Dayton, OR
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    Awesome! Thank you!


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  9. #29
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    Philadelphia
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    Quote Originally Posted by wertyu78 View Post
    Update: I am currently on the hunt for the items needed to complete this conversion. My goal is to photo document this process. The first step will be to layout the MS43 harness next to the MS45.1 harness for comparison. I've been doing some reading online and have found that there are some folks who have run into issues with the alternator and throttle body connectors being different between the harnesses, while others claim that it is plug n play.
    I don't know how far you got, but in theory the conversion wouldn't be too difficult. There are 5 connectors going into the DME (X60001 -> X60005). The functions are (roughly) the following:

    X60001: DME Power
    X60002: O2 sensor connections and "transmission harness" (reverse switch)
    X60003: Main engine harness
    X60004: DME / DSC / Body interface (built into chassis harness)
    X60005: Ignition harness

    X60001, 2, 3, and 5 can be easily replaced with the MS43 pieces. X60004 cannot be easily replaced, so it will have to be repinned. Also since the MS43 comes with narrowband O2s unlike the MS45.1, you'd have to get MS43 O2 sensors too.

    X60001 and 2 come as one piece and the correct part number for a 330 6-speed would be 12517520114 (auto transmission cars will be different)
    X60003 can be pulled from any MS43 325/330 - part number is 12517513554
    X60005 can be pulled from any 325/330 built between 09/2002 and 03/2003, and any xi built after 09/2002 -- correct part number is 12517518044

    Note: RealOEM has some mistakes on the part numbers for these - if it disagrees with what I have, go with what I have listed.

    X60004 would have to be repinned slightly (Probably 10 or so wires to move around), not difficult, though I don't have my spreadsheets with the info in front of me right now.

    Alternator connector probably won't match, though I think you can just change the voltage regulator and not have to worry about that. Throttle body connector should match since the throttle bodies didn't change.

    You'll also have to add an IAT sensor and change to the 3-pin MAF (though if we have full tuning capability on the MS43, it might be feasible to just use the stock 5-pin MAF and rescale the software)

    I haven't decided whether or not I want to go this way. I like the wideband O2s in the MS45, so personally I'd rather be able to figure out how to tune this damn thing. But that is looking difficult with how little information there is out there (on the flip side, it seems to be quite similar to the MSV70 structurally, so it should be possible to figure some things out).

    Edit: It occurred to me that you'd also have to either delete the secondary air pump or retrofit the MS43 SAP.
    Last edited by terraphantm; 02-11-2016 at 02:06 PM.

  10. #30
    Join Date
    Jan 2014
    Location
    Raleigh, NC
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    257
    Interesting... this would allow us to use the EU2 tune on our ZHPs I suppose. Now that I am almost done installing headers I would love to have an EU2 tune instead of paying $500 for some tune chip that does close to the same.
    2004 Silver Grey ZHP Sedan 6 Speed Manual
    CDV Delete, AUX Input, Clear TMS Lights, Stealth Bulbs, Orion V2 Angel Eyes, Black Grille,
    aFe Stage 1 CAI Pro 5r, Dinan Front Strut Brace, CF Splitters, Active Autowerke Headers

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