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Thread: For those of you in search of zoom (M73 cars only) . . .

  1. #1
    Join Date
    Mar 2006
    Location
    Harrisburg, PA, USA
    Posts
    377
    My Cars
    x5, 640i, 850Ci, 850CSi

    For those of you in search of zoom (M73 cars only) . . .

    I just installed the [upgraded?][improved?] transmission control unit (TCM) that m6bigdog has made available for the M73 cars. I don't know how many of you there are on this forum that haven't performed this upgrade, but just do it. Without question the easiest, best bang for the buck you can do for your car. I now have full sport mode as well as manual mode, and the installation takes all of about 10-15 minutes. This literally makes my 850Ci as quick and fun to drive as my 850CSi (heresy, I know), without having to row through the gears. I know that these won't be available forever, and I'm not sure how many he has left, so all I can say is -- GET IT! I promise you won't be disappointed.
    Mike Barrett
    94 850CSi, Hellrot over silbergrau dunkel/silbergrau hell
    96 850Ci, Oxfordgrun over silbergrau hell

  2. #2
    Join Date
    Dec 2011
    Location
    CSRA, SC
    Posts
    661
    My Cars
    850Ci, Excursion
    Reading all the comments about this mod makes me want an M73 car more LOL and I'm so manual-transmission-obsessed I swapped a 6 speed manual into my Excursion. Sounds like a great mod to a great car for sure!

  3. #3
    Join Date
    Oct 2002
    Location
    Cold Snowy North
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    7,163
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    Misc.
    I complete agree.
    I have several hunderd miles of smiles with this upgrade....this TCM + my 3.23LS differential that have transformed the car.

  4. #4
    Join Date
    Aug 2007
    Location
    San Ramon, CA
    Posts
    1,430
    My Cars
    850Ci, M5, Model-S P85D
    Mike,
    Thanks for posting your experience with the 850-M73 SD-TCM upgrade...
    You said it.. 850-M73 "as quick and fun to drive as my 850CSi", you should know...

    I always thought that BMW didn't offer the Sport Mode option with the M73 for fear of the competition and hurting CSi sales!!
    Well, the 850-M73 Sport Mode is now an available option!!

    I just harvested another 7 TCM's from eBay for upgrade with SD EPROMs.
    I only have a couple upgraded SD-TCM,s ready to ship and this will allow me to make what I anticipate will be the last production run, before summer.

    Lots to read:
    https://www.bimmerforums.com/forum/s...DONE-Wonderful

    https://www.bimmerforums.com/forum/s...rogram-Finally





    Quote Originally Posted by mbarrett635 View Post
    I just installed the [upgraded?][improved?] transmission control unit (TCM) that m6bigdog has made available for the M73 cars. I don't know how many of you there are on this forum that haven't performed this upgrade, but just do it. Without question the easiest, best bang for the buck you can do for your car. I now have full sport mode as well as manual mode, and the installation takes all of about 10-15 minutes. This literally makes my 850Ci as quick and fun to drive as my 850CSi (heresy, I know), without having to row through the gears. I know that these won't be available forever, and I'm not sure how many he has left, so all I can say is -- GET IT! I promise you won't be disappointed.
    Last edited by m6bigdog; 02-24-2024 at 03:38 PM.

  5. #5
    Join Date
    Dec 2010
    Location
    Newbury Park, CA
    Posts
    167
    My Cars
    1995 BMW 850CI
    Which version did you get?
    EricinConejo

    1995 850CI, 1959 Chev Impala, 1965 Cessna 172, 1986 Mustang GT, 2002 Mustang GT, 2005 Dodge Durango Hemi, 2016 Land Rover Discovery Sport

  6. #6
    Join Date
    Oct 2002
    Location
    Cold Snowy North
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    7,163
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    Misc.
    I got both; currently using the 3.15 version; so far so good.

  7. #7
    Join Date
    Mar 2006
    Location
    Harrisburg, PA, USA
    Posts
    377
    My Cars
    x5, 640i, 850Ci, 850CSi
    Quote Originally Posted by EricinConejo View Post
    Which version did you get?
    I got the 2.81 version.


    Sent from my iPhone using Tapatalk
    Mike Barrett
    94 850CSi, Hellrot over silbergrau dunkel/silbergrau hell
    96 850Ci, Oxfordgrun over silbergrau hell

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