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Thread: MS3Pro to M50TU Adapter

  1. #1
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    MS3Pro to M50TU Adapter

    Hello all,

    I've posted in the Tuning section also, but it seems that the FI section is more active, and we likely wouldn't be tuning if we weren't going FI, SO.

    For my E34 Turbo project, I have an MS3Pro, a gutted case with an 88-pin connector, stock coil drivers, and a universal harness for the MS3Pro. I've found a number of threads for building an adapter harness for the MS3x and M50TU, but none for the MS3Pro. During my attempt at building a pinout, I'm running into issues finding where exactly grounds are supposed to go. I've read the the sensor grounds are different than the rest in that they don't go to earth?

    In older posts for the MS3x, such as goathumpers, all of the grounds on the 88-pin were connected to a single spot via ring connector, along with the grounds from the MS3x. Is this how it's supposed to be done for the MS3Pro also or do the grounds from the MS3Pro connect to individual pins on the 88-pin?

    My pinout: https://docs.google.com/spreadsheets...gJBjOg/pubhtml

    Thanks in advance!

    IMG_20180511_162536.jpg
    Last edited by CallMePuff; 05-13-2018 at 12:12 PM.

  2. #2
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    Hey! That stuff looks familiar. Glad to see its being put to good use.
    Last edited by jakermac; 05-13-2018 at 10:36 PM.

  3. #3
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    Quote Originally Posted by jakermac View Post
    Hey! That stuff looks familiar. Glad to see its being put to good use.
    It's been a slow roll so far, but I'm finally (attempting) to get this thing set up!

  4. #4
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    Sensor grounds are exactly what they say, grounds for sensors that require grounds. Cam and Crank sensors are the most important to do this with.
    1997 328is - Mishimoto Rad - 17" wheels - E46 Sport seats - Suede headliner - M Bumper - A118 Dashcam - Escort Radar Detector - FX-R Bi Xenon Projectors - iJDM Switchback Angel Eyes - Joying Android Double DIN head unit, Megasquirt PNP, Holset HX35, Deka 80lb injectors, SPA T3, Precision PW39 WG, Synapse Synchronic BOV, GM Flex Fuel sensor, Innovate LC-2 W/B, Mishimoto Intercooler, Mishimoto Catch Can, Corsa Exhaust

  5. #5
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    Quote Originally Posted by somebody5788 View Post
    Sensor grounds are exactly what they say, grounds for sensors that require grounds. Cam and Crank sensors are the most important to do this with.
    Excuse my ignorance, but does that mean it's kosher to connect all of the grounds from the 88-pin to one spot and connect all of the relevant grounds (sensors, cam, crank) to the same spot?

    Sent from my Nexus 6P using Tapatalk

  6. #6
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    Quote Originally Posted by CallMePuff View Post
    Excuse my ignorance, but does that mean it's kosher to connect all of the grounds from the 88-pin to one spot and connect all of the relevant grounds (sensors, cam, crank) to the same spot?

    Sent from my Nexus 6P using Tapatalk
    Cam position and Crank Position when they have their own ground should be grounded directly to a sensor ground with nothing else grounded on that wire. Same goes for any factory sensor that is grounding to the computer. Sensor grounds are grounds for sensors and nothing else.
    1997 328is - Mishimoto Rad - 17" wheels - E46 Sport seats - Suede headliner - M Bumper - A118 Dashcam - Escort Radar Detector - FX-R Bi Xenon Projectors - iJDM Switchback Angel Eyes - Joying Android Double DIN head unit, Megasquirt PNP, Holset HX35, Deka 80lb injectors, SPA T3, Precision PW39 WG, Synapse Synchronic BOV, GM Flex Fuel sensor, Innovate LC-2 W/B, Mishimoto Intercooler, Mishimoto Catch Can, Corsa Exhaust

  7. #7
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    There are 2 types of grounds in this case, like SomeBody posted.

    1. A power ground- this is the MS3pro grounding. Think of this as an output
    2. Sensor ground- this is intended to use for sensors that need a ground. Think of this as a input.

    As many power grounds should be used/grounded as possible.

    Also, remember what your trying to do with a ground, which is completing a circuit, which means your trying to get back to the negative of the battery. This can be done grounding through the car, but alot of times thats not good enough.
    328i Sedan Twin s366's, 6.0LS, TH400, MS3 Ultimate
    9.20 at 150 on 22psi

  8. #8
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    Quote Originally Posted by dburt86 View Post
    There are 2 types of grounds in this case, like SomeBody posted.

    1. A power ground- this is the MS3pro grounding. Think of this as an output
    2. Sensor ground- this is intended to use for sensors that need a ground. Think of this as a input.

    As many power grounds should be used/grounded as possible.

    Also, remember what your trying to do with a ground, which is completing a circuit, which means your trying to get back to the negative of the battery. This can be done grounding through the car, but alot of times thats not good enough.
    Both you and somebody have added great insight!

    Since this will be an adapter where the MS3 connects to the pins on the 88-pin connector which connect to the wiring harness, will the ground wires from the MS3 be connecting solely to ground pins on the stock harness?

    As far as I've seen, there are never ground wires from the adapter going to their own spot on the car.

    Sent from my Nexus 6P using Tapatalk

  9. #9
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    All of the brown wires are grounds to chassis. Also the brown with orange stripe I believe too.
    1997 328is - Mishimoto Rad - 17" wheels - E46 Sport seats - Suede headliner - M Bumper - A118 Dashcam - Escort Radar Detector - FX-R Bi Xenon Projectors - iJDM Switchback Angel Eyes - Joying Android Double DIN head unit, Megasquirt PNP, Holset HX35, Deka 80lb injectors, SPA T3, Precision PW39 WG, Synapse Synchronic BOV, GM Flex Fuel sensor, Innovate LC-2 W/B, Mishimoto Intercooler, Mishimoto Catch Can, Corsa Exhaust

  10. #10
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    Quote Originally Posted by somebody5788 View Post
    All of the brown wires are grounds to chassis. Also the brown with orange stripe I believe too.
    Awesome! Thanks a ton. I also just got a Bentley manual, so I'll confirm that info.

    Sent from my Nexus 6P using Tapatalk

  11. #11
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    Ive done it both ways. Using all the factory grounds and then taking them out of the 88pin and grounding them separate. I didnt notice a difference, but if you run into issues, this is where id look first.
    328i Sedan Twin s366's, 6.0LS, TH400, MS3 Ultimate
    9.20 at 150 on 22psi

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