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Thread: EML Switch in 850i

  1. #1
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    EML Switch in 850i

    My 1991 850i 6-speed has a working EML switch. From what I can find, this was something that only the 850CSi was equipped with. I know my car was owned by some kind of enthusiast before me because of the complete CSi kit, Bilstein sport shocks, Dinan sway bars, alcantara headliner, and by looking at the maintenance receipts I got with the car.

    Is it possible that they retrofitted this feature? Did any 850i come with this as an option? The VIN is CB42282 and it doesn't show up on the build sheet.

    1995 540i/6 // Dylan Leff - www.originalplate.com


  2. #2
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    not sure what you mean by an EML switch. that doesnt make sense to me.
    do you mean EDC? the EML is the computer brain controlling the two DME modules.
    I swear, my cars are like a girlfriend.
    Sometimes its a rough ride, sometimes its smooth motorin'.
    Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
    BUT at the end of the day, she loves it when I am inside her.

  3. #3
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    image.jpeg

    The EML switch controls how much the throttle opens based on pedal position, it switches between sport and comfort modes. This photo is from an 850CSi.

    1995 540i/6 // Dylan Leff - www.originalplate.com


  4. #4
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    I have NEVER seen a regular 850 with this switch, I am sure it was retrofitted... interesting!

  5. #5
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    With a little bit of creativity you can "upgrade" an M70 EML with a different EEPROM which has 2 throttle response maps like the 850CSi EML. More details in How does the EML button work on CSi's?.

  6. #6
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    That's a real interesting read. I'll also add that there is no S light on the cluster when using the switch, but I definitely feel the change if I flip the switch while at partial throttle.

    1995 540i/6 // Dylan Leff - www.originalplate.com


  7. #7
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    What is also possible: the M70 EML already has 2 throttle maps from factory (but not active because they do not have the switch).

    Developing a new Bosch EML just for a few manual 850i's......why, they already had it !
    They just took the CSI 6-speed with EML and installed it without switch (and probably changed the eprom a bit.... different map's and ID so it shows as M70 in DIS).

    If the EML loom is the same for all 850's.... then it might just work by installing the switch (connector pre-wired).

    EML's: 850i and 850 CSI, most are the same ! (hardware.... trust me... I did open them and INDENTICAL hardware.... even the numbers on the PCB boards are the same for some versions).
    p.s. not all but tested a few and you can just swap and reprogram most and runs !

    I chipped one of my CSI's and used an 750 M70 EML (just to keep the original EML original.... still sealed). The hardware is indentical ! I just put in the new eprom's.
    If you install the M70 EML in a CSI: DIS just sees it in the CSI as an M70 EML. Installed the S70 eprom and DIS sees it as an S70 EML.

    You can just install the S70 eprom in the M70 EML (manual box) and it runs with EML switch (EML just handles throttle).


    What number (picuture would be perfect) is your EML ?
    Connected to DIS: what does it say (M70 or S70 EML) ?
    BMW 850 CSI march 1994 (EU spec), SOLD. https://www.classiccars-forsale.com/...94-bmw-850csi/
    BMW 850 CSI november 1994 (EU spec)

  8. #8
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    Quote Originally Posted by mojocoggo View Post
    image.jpeg

    The EML switch controls how much the throttle opens based on pedal position, it switches between sport and comfort modes. This photo is from an 850CSi.
    Wow, 8 years an owner of an 850i and still learning about features (of a CSi).

    I just installed the "PedalBox" on my e53 and it works to change throttle positioning in a huge way... this EML switch is a pre PedalBox design. neat to have.
    Last edited by clockwork; 05-30-2016 at 06:10 PM.
    I swear, my cars are like a girlfriend.
    Sometimes its a rough ride, sometimes its smooth motorin'.
    Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
    BUT at the end of the day, she loves it when I am inside her.

  9. #9
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    Quote Originally Posted by mojocoggo View Post
    That's a real interesting read. I'll also add that there is no S light on the cluster when using the switch, but I definitely feel the change if I flip the switch while at partial throttle.
    Ahhh....when I test drove my CSi the first time when it was still in Baltimore that was a magical moment when I flipped that switch . You're a lucky guy! I planned on doing this to the 850 too but it is a little involved. In case you want to get the "S" indicator working you're going to have to plug into the automatic trans harness that has a connection to the gauge cluster. The connector for the harness is the same as one of the big connectors in the seats. 16 or 18 pin me thinks. I'd have to dig out my notes.

    I wonder what chip's settings you have...could be OEM/Wokke.
    CB42366 - 1991 850i 6-speed. Brilliantrot & Black Nappa Leather
    CD00144 - 1994 850CSi. Hellrot & Black Nappa Leather


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  10. #10
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    Is this feature only for a manual trans EML?

  11. #11
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    Is like the 'sport' setting that the e-spec and j-spec 850's have?
    Live, Love, Life, Amazing...

  12. #12
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    Could you run that switch in a auto m70 e31?

  13. #13
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    Quote Originally Posted by peezen View Post
    Is like the 'sport' setting that the e-spec and j-spec 850's have?
    Yes, it's triggered via some automatic transmission mode switch.
    All it does just ground pin 52 of the EML.
    Likely you could install CSI chip in an auto and run the S switch of the transmission if you have it.

  14. #14
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    You can trip PIN number 52 or 54 (I can't recall) to keep the car in S mode at all times. Omega Man should know the exact pin #s.

    I have an S70 car that had no EML switch, so above was done to keep it in S mode at all times.

    Alex
    Last edited by alex840; 07-25-2018 at 02:24 AM.

  15. #15
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    Yes ground pin 52 on the EML to switch maps to Sport mode. I think (I don't own an auto) that the EGS will ground pin 52 when sport drive mode is selected. The throttle map may not be as aggressive in the auto but the Alpina AUTO EML file is like the CSi. I have a copy of that file if any Auto owners would like to try it.

  16. #16
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    But grounding pin #52 on the control box for the automatic gear box, it only puts the transmission into lock-up mode to minimize any slip. Wokke did have some logic to over ride this to invoke an early lock-up at around 70 km/h.

  17. #17
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    Quote Originally Posted by peake View Post
    But grounding pin #52 on the control box for the automatic gear box, it only puts the transmission into lock-up mode to minimize any slip. Wokke did have some logic to over ride this to invoke an early lock-up at around 70 km/h.
    pin 52 on the EML

  18. #18
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    Hallo,
    sorry for my bad english.
    I have tested some configurations on my 4/94 auto M70 850i.
    I think gearbox in Eco/Sport does not improve performace.
    The same with the Alpina EML.
    The Alpina EGS makes the car slower - i think the gear shift is to late. Not enougth power at high revs.
    The DME Chips are a performace improove. After 6 testrauns the car ist with the DME Chips like the first run. The 9. testrun in Stock mode is compared to the the DME chips slower.
    Tested with "Performace Box". Car ist rolling in idle at the biginning of the test - better for the all Part of the car.
    Attached Images Attached Images

  19. #19
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    In the European e31 there is a switch connected to the EML #52. This switch selects 3 modes for the transmission, S-E-M, (Sport, Eco and Manual). Read about it in the ETM manual page 2460.0A-2. The manual (M) mode is used for motor breaking going down steep roads. The sport (S) mode makes a large difference in acceleration and switching off the ASC+T makes it even more aggressive.

  20. #20
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    Quote Originally Posted by E31 850i View Post
    Hallo,
    sorry for my bad english.
    I have tested some configurations on my 4/94 auto M70 850i.
    I think gearbox in Eco/Sport does not improve performace.
    The same with the Alpina EML.
    The Alpina EGS makes the car slower - i think the gear shift is to late. Not enougth power at high revs.
    The DME Chips are a performace improove. After 6 testrauns the car ist with the DME Chips like the first run. The 9. testrun in Stock mode is compared to the the DME chips slower.
    Tested with "Performace Box". Car ist rolling in idle at the biginning of the test - better for the all Part of the car.
    That is excellent information - it must have taken a long time to do all those tests!

    Sports mode should decrease acceleration times, so I would suggest that there is some problem with your engine at high load and high revs - and that can often be a restriction in the exhaust, possibly catalytic converters starting to fail.

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  21. #21
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    Quote Originally Posted by E31 850i View Post
    Hallo,
    sorry for my bad english.
    I have tested some configurations on my 4/94 auto M70 850i.
    I think gearbox in Eco/Sport does not improve performace.
    The same with the Alpina EML.
    The Alpina EGS makes the car slower - i think the gear shift is to late. Not enougth power at high revs.
    The DME Chips are a performace improove. After 6 testrauns the car ist with the DME Chips like the first run. The 9. testrun in Stock mode is compared to the the DME chips slower.
    Tested with "Performace Box". Car ist rolling in idle at the biginning of the test - better for the all Part of the car.
    Hello!
    Interesting tests!
    Ah, ok, I understand.
    What chips did you use for DME?
    Last edited by Diskovod; 07-28-2018 at 05:53 PM.

  22. #22
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    -it must have taken a long time to do all those tests!
    -> less then one hour

    -Sports mode should decrease acceleration times, so I would suggest that there is some problem with your engine at high load and high revs - and that can often be a restriction in the exhaust, possibly catalytic converters starting to fail.
    -> i think the car is ok:
    Test hills up: 0-80kmh 5,1s (BMW 5,3s); 0-100kmh 7,4s (7,4s); 1/4mile 15,3s (15,2s); 1000m 27,4s (27s)
    If the exhaust oder an other thing broken, it is take effekt in Sport and economy mode.

    I got the Tuning in a "BIN" file.
    -Alpina B12 EGS (239 Bytes different to stock)
    -Alpina B12 EML (28 Bytes different to stock)
    -Rottaler2 / Landzer DME (326 Bytes differnt to stock)
    If theese are real Alpina/Rottaler2/Landzer files? I dont know.

    If you are interessted, i can show die full trottle spark advanced difference stock/tuning.
    I drive the car with the stock chips. I dont trust the tuning files. Only for testing i put the tuning files on.

  23. #23
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    Quote Originally Posted by peake View Post
    In the European e31 there is a switch connected to the EML #52. This switch selects 3 modes for the transmission, S-E-M, (Sport, Eco and Manual). Read about it in the ETM manual page 2460.0A-2. The manual (M) mode is used for motor breaking going down steep roads. The sport (S) mode makes a large difference in acceleration and switching off the ASC+T makes it even more aggressive.
    I was watching a youtube video just a few days ago of a euro 850 auto accelerating and could clearly see when in S mode, all 4 gears were available. Here in the US my 91 850 has only 3 gears in S mode (4th gear locked out) which I find annoying because once up to cruising speed there is no reason to stay in 3rd forcing me move between D and 3.

    Do you think the US 850 can function like the EU model by replacing the US A/M switch with a EU E/S/M switch? Do you know if the EU and US EML/EGS are the same (4 speed auto)? I would make any necessary wiring changes to accommodate a EU switch or one of my own making.

  24. #24
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    The ESM Euro transmission switch is wired differently than the AM Domestic switch and has a different harness, I have switches and I think a harness available somewhere as I had the same thought years back about installing the Euro style. I also think you need the Euro style Transmission controller (which I also have available). FWIW.....
    91 850 (Panzer), 2012 Mini Cooper Countryman (WifeMobile) www.wuffer.ca


  25. #25
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    My 04/92 euro M70 auto has:
    EGS "CR"
    EML 0 205 000 015; 1733600
    DME 0 261 200 352; 1738703

    I have the BINs here. I think you have an other EGS. Check the Code. (CR at mine)

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