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    • DCT Build Part XII - Build complete, pictures of final assembly, transmission cooler, and Viton seals

      Well, this has been a rather lengthy road to completion but the transmission is basically complete. The car was dropped off by SSP last month to Gintani who should have the motor in by the end of this week. The problem is SSP mounted their trans cooler in the location the heat exchanger for the supercharger needs to go so SSP will need to come to Gintani's facility to re-run their lines as the cooler will need to go in a different location. What took so long for this update? Well, we have been waiting, and waiting, and waiting for SSP to send us details on the Viton seals that required 3 redesigns but never received the information on why these seals are superior to the stock units.

      So, I decided to do my own research and here is what I came up with. These are the stock BMW seals used in the DCT. What is wrong with them exactly? We do not know other than they apparently are not up to the task:










      Here are the Viton seals which delayed the project by 3 months. Viton is a synthetic rubber used for seals, O-rings, things of that sort. Viton was likely used as it is less susceptible to decay and already used in BMW applications such as in VANOS. Viton has much higher temperature and chemical resistance characteristics than the stock seals. Here is what they look like:










      This is the DCT cooler that was mounted by SSP up front. This needs to be moved somewhere else as the supercharger heat exchanger will need to go there. This means SSP will need to come out and run their lines again checking all their fluids and so forth before tuning can take place:














      This is the final assembly. So, the transmission is built but it took about a year longer than estimated. I believe I was as patient as possible and hopefully this will all be wrapped up in December with a built motor, built transmission, a YSI, and a ton of horsepower.






































      This article was originally published in forum thread: M3 DCT Build Journal - World's First BMW DCT Build started by Sticky View original post
      Comments 2372 Comments
      1. Sticky's Avatar
        Sticky -
        They will have an update for me Wednesday. Looks like they are aiming for Kris@SSP to fly out next week sometime to finish up his work.

        Chances of me getting this for Christmas don't look good. Oh well, what's a few more weeks?
      1. Yukohama's Avatar
        Yukohama -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        They will have an update for me Wednesday. Looks like they are aiming for Kris@SSP to fly out next week sometime to finish up his work.

        Chances of me getting this for Christmas don't look good. Oh well, what's a few more weeks?
        hopefully not a couple more months... im pretty eager as im sure many are to see this beast fired up
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Yukohama Click here to enlarge
        hopefully not a couple more months... im pretty eager as im sure many are to see this beast fired up
        I'm considering just going into hibernation until it's done.
      1. ultimateendz's Avatar
        ultimateendz -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        They will have an update for me Wednesday. Looks like they are aiming for Kris@SSP to fly out next week sometime to finish up his work.

        Chances of me getting this for Christmas don't look good. Oh well, what's a few more weeks?
        i guess a few more weeks wont hurt...i mean its been a couple yrs now
      1. PennywiseM3's Avatar
        PennywiseM3 -
        I did mean the 7DCI600. We had my friend's 2011 BMW 335is DCT on the lift the other day trying to figure out if it had the new 7DCI700 DCT in it, there just isn't enough information on the internet to figure out if he has the 7DCI700. It does not take much tuning with the 335is before your torque starts getting close to the 7DCI600 torque limitations.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by PennywiseM3 Click here to enlarge
        I did mean the 7DCI600. We had my friend's 2011 BMW 335is DCT on the lift the other day trying to figure out if it had the new 7DCI700 DCT in it, there just isn't enough information on the internet to figure out if he has the 7DCI700. It does not take much tuning with the 335is before your torque starts getting close to the 7DCI600 torque limitations.
        Well the SSP upgraded clutch discs should work for either...
      1. inlineS54B32's Avatar
        inlineS54B32 -
        Sticky, not sure if this helps - but the latest European Car says the following in regard to the new gearbox in the M5: "the Getrag-built DCT dual-clutch transmission is similar in design to the MS's DCT, but features considerably beefed up internals" ... "The new gearbox has a 700Nm torque capacity - Gehring explains - It was a big challenge to strengthen the gearbox while trying to keep weight roughly the same. It is, in effect, the M3 DCT unit with stronger components throughout." -- European Car

        There is also a picture of the gearbox - I can snap a photo of the article if someone could identify it.

        Cheers.
      1. Sticky's Avatar
        Sticky -
        That helps, thanks. Seems Getrag did the same thing I did.

        Please do snap a photo!
      1. inlineS54B32's Avatar
        inlineS54B32 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        That helps, thanks. Seems Getrag did the same thing I did.

        Please do snap a photo!
        Here you go - excuse the flash burn...

        Attachment 12984
        Attachment 12985
        Attachment 12986
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by inlineS54B32 Click here to enlarge
        Here you go - excuse the flash burn...

        Attachment 12984
        Attachment 12985
        Attachment 12986
        Thank you!
      1. inlineS54B32's Avatar
        inlineS54B32 -
        No problem - anytime. Click here to enlarge
      1. milkt's Avatar
        milkt -
        Well, post 876 shows they know how to reassemble it. That's good stuff.

        cliff notes anyone?

        What special fabricated parts are we waiting on.
      1. GG///M3's Avatar
        GG///M3 -
        Click here to enlarge Originally Posted by milkt Click here to enlarge
        Well, post 876 shows they know how to reassemble it. That's good stuff.

        cliff notes anyone?

        What special fabricated parts are we waiting on.
        Plus 1. It maybe better to wait for someone to wreck the new m5 and swap the transie over into the never ending project
      1. inlineS54B32's Avatar
        inlineS54B32 -
        Click here to enlarge Originally Posted by GG///M3 Click here to enlarge
        Plus 1. It maybe better to wait for someone to wreck the new m5 and swap the transie over into the never ending project
        I really think this is a good way to get hands on one - would probably be close to a perfect fit, and would be perfect for you guys with some serious torque.
      1. inlineS54B32's Avatar
        inlineS54B32 -
        And we know this (wreck) will happen within the first month (week) this thing is released Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        The electronics in the M5 transmission may not make it a simple swap.

        Regardless, it's torque capability will be less than what my trans is capable of.

        Not to mention getting a hold of a $15k transmission out of a brand new car isn't exactly easy...
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by GG///M3 Click here to enlarge
        Plus 1. It maybe better to wait for someone to wreck the new m5 and swap the transie over into the never ending project
        Ya, it makes far more sense to wait around and hope someone wrecks one and then that they sell their transmission rather than upgrade your own, logical.

        Never ending? Ok, if you say so.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by milkt Click here to enlarge
        Well, post 876 shows they know how to reassemble it. That's good stuff.

        cliff notes anyone?

        What special fabricated parts are we waiting on.
        There are no parts to wait on, read the update.
      1. milkt's Avatar
        milkt -
        Click here to enlarge Originally Posted by inlineS54B32 Click here to enlarge
        I really think this is a good way to get hands on one - would probably be close to a perfect fit, and would be perfect for you guys with some serious torque.
        It may be a long time until serious torque is available to these cars, but they're handsome and handle well.
      1. PennywiseM3's Avatar
        PennywiseM3 -
        We stopped by Active Autowerkes last night on the way down to Homestead Speedway's 1/8th mile dragstrip and they said my friends 2011 BMW 335is DCT has the Getrag 7DCI600 in it. They had a bunch of cool projects going on in there garage.