• 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. inlineS54B32's Avatar
        inlineS54B32 -
        Click here to enlarge Originally Posted by milkt Click here to enlarge
        It may be a long time until serious torque is available to these cars, but they're handsome and handle well.
        The M5 already is hitting 700 Nm (which is what the new Getrag is rated at) - the 335i with a good kit (from the dyno numbers I have seen) is really close to 500 ft-lbs which is right about 700Nm...

        You are right if you are talking S65 power though - I think most kits are a bit north of 400 ft-lbs...

        It's the hard launches that will kill the clutches - throwing sticky tires (drag radials?) with 400 ft-lbs of torque - and having no wheel slip is different than launching with slip. Time will tell - but even Sticky's clutch(es) were hurting - and as you said, well under serious torque levels...

        If I could (even @ stock power levels) have the new Getrag transmission, I would love to - just for the comfort of not burning out expensive clutches.

        They are damn good looking cars - and handle very well. Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by PennywiseM3 Click here to enlarge
        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.
        That makes sense and there are plenty of options for strengthening the 7DCI600.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by inlineS54B32 Click here to enlarge
        The M5 already is hitting 700 Nm (which is what the new Getrag is rated at) - the 335i with a good kit (from the dyno numbers I have seen) is really close to 500 ft-lbs which is right about 700Nm...

        You are right if you are talking S65 power though - I think most kits are a bit north of 400 ft-lbs...

        It's the hard launches that will kill the clutches - throwing sticky tires (drag radials?) with 400 ft-lbs of torque - and having no wheel slip is different than launching with slip. Time will tell - but even Sticky's clutch(es) were hurting - and as you said, well under serious torque levels...

        If I could (even @ stock power levels) have the new Getrag transmission, I would love to - just for the comfort of not burning out expensive clutches.

        They are damn good looking cars - and handle very well. Click here to enlarge
        Torque levels are meaningless and with a centrifugal blower it isn't about peak torque but adding it toward redline for hp multiplication which some guys don't seem to understand.

        My clutches were used up from launches not hurting from torque.

        I want horsepower and making more with less torque means less stress and less traction issues. These guys whining about torque in cars that are slower is hilarious.
      1. inlineS54B32's Avatar
        inlineS54B32 -
        Agreed - if I wanted gobs of torque, I would buy a 330d. I like moderate amounts of torque - created across A HUGE RPM band (M3), to make a very good horsepower average - and a redline horsepower that is outstanding. This makes for a car that is "easy" to control out of corners - and simply a great overall "feel"...

        I think the whole torque thing is overrated (no pun intended - although not sure if this is a pun) Click here to enlarge -- point is, I think people like the way it feels and equate it with speed - it's hard to explain that it's horsepower not torque that matters. Being able to make torque at high RPM is what matters - and that's what your centrifugal supercharger is helping out with. The car is running out of breath at 8000+ RPMs - and you are helping it out with more and more air as engine speed increases.

        Would really love to see your car run when you are done with it - it's been a long ride, but am sure it will be awesome when back on the streets.

        Cheers.
      1. GG///M3's Avatar
        GG///M3 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        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.
        It was a joke making fun of ur never ending thread. I guess that was way over ur head. Now go try and interview someone when they do not want to be(test driver for bmw in the m5 priceless)Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by GG///M3 Click here to enlarge
        It was a joke making fun of ur never ending thread. I guess that was way over ur head. Now go try and interview someone when they do not want to be(test driver for bmw in the m5 priceless)Click here to enlarge
        Kind if cute how you follow me around like a puppy dog. Never ending? Weird, last update was the end of the trans build but don't let reality or anything get in your way.

        What is priceless is how you are such a jealous hater. This obviously isn't the forum for you. When people have transmissions worth more than your entire car you probably shouldn't try to talk down when they are doing things you never will be able to. Hi 5
      1. e38 prototype's Avatar
        e38 prototype -
        I may be new here, and I've read this whole thread... and let me just say Sticky that you're kinda like one of those fly traps hanging from the ceiling, your name suits you well.

        I commend you for dealing with all these haters over product development in your own personal car, and how you handle them all. Not going to lie I've seen probably THE STUPIDEST responses to your project to date, that I've seen on any forum... ever.

        K.. back on topic... those oil pans are sick!!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by e38 prototype Click here to enlarge
        I may be new here, and I've read this whole thread... and let me just say Sticky that you're kinda like one of those fly traps hanging from the ceiling, your name suits you well.

        I commend you for dealing with all these haters over product development in your own personal car, and how you handle them all. Not going to lie I've seen probably THE STUPIDEST responses to your project to date, that I've seen on any forum... ever.

        K.. back on topic... those oil pans are sick!!
        Most people are cool about it, it's just the same couple people who have a problem with everything. Doesn't matter, they are irrelevant. Thanks for the kinds words, it's an interesting project.
      1. stega's Avatar
        stega -
        Sticky I got a question.
        I just boosted my e93 m3, ess 600 kit. Car is a dct w/ full catless exhaust and 3.45 gears. I have been putting the tranny into safe mode with some hard launches back to back so I have been looking into doing a dct tranny cooler and possibly add the SSP pan w/ 2 extra liters of capacity as well as cooling fins.

        Do you happen to know if the cooler SSP made for you retains DME-controlled oil flow and temperature control?

        I would also like to ask a few other questions, any way we could have a quick talk on the phone? Lemme know.


      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by stega Click here to enlarge
        Do you happen to know if the cooler SSP made for you retains DME-controlled oil flow and temperature control?
        Yes, those DME functions were not altered.

        Click here to enlarge Originally Posted by stega Click here to enlarge
        I would also like to ask a few other questions, any way we could have a quick talk on the phone? Lemme know.
        I would prefer to just speak on the forum as on the phone won't serve as a resource for anyone. Any questions you have just go ahead and ask here.
      1. stega's Avatar
        stega -
        Ok cool I will ask here, I agree its nice if everyone can learn... did SSP ever figure out where they are mounting the cooler as it was in the way of the blowers cooler...?

        Does this replace the oem tranny cooler mounted passenger side of bumper??

        Thanks for the quick response.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by stega Click here to enlarge
        did SSP ever figure out where they are mounting the cooler as it was in the way of the blowers cooler...?
        No, they should be doing that next week.

        Click here to enlarge Originally Posted by stega Click here to enlarge
        Does this replace the oem tranny cooler mounted passenger side of bumper??
        Yes.
      1. stega's Avatar
        stega -
        Ok, so I am assuming it was impossible to fit the new one in the OEM's cooler place? Not even if they cut away a bit??

        Cant wait to see your car running, at that point I will have a few more questions.

        I also wanted to say I love the site and what you have done with your build, all of the info here has been extremely helpful to many decisions I have made. You got some balls most of the M community does not.

        PS: ESS is betta!! lol j/k Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by stega Click here to enlarge
        Ok, so I am assuming it was impossible to fit the new one in the OEM's cooler place? Not even if they cut away a bit??
        Most likely, yes. It is much larger.

        Click here to enlarge Originally Posted by stega Click here to enlarge
        Cant wait to see your car running, at that point I will have a few more questions.
        I hope I will have the answers and I can't wait to see it running either.

        Click here to enlarge Originally Posted by stega Click here to enlarge
        I also wanted to say I love the site and what you have done with your build, all of the info here has been extremely helpful to many decisions I have made. You got some balls most of the M community does not.
        My pleasure, if you appreciate it please refer people to it.

        Yes, big balls, $#@! the warranty.
      1. stega's Avatar
        stega -
        Oh and one last thing I forgot...
        What tranny fluid are you going to be using? SSP's or OEM?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by stega Click here to enlarge
        Oh and one last thing I forgot...
        What tranny fluid are you going to be using? SSP's or OEM?
        SSP's.
      1. fastgti69's Avatar
        fastgti69 -
        Saw your car today sticky... Just posted with the HRE's without an engine inside lol.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
        Saw your car today sticky... Just posted with the HRE's without an engine inside lol.
        The engine still isn't in? That's great...
      1. fastgti69's Avatar
        fastgti69 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        The engine still isn't in? That's great...
        No, but Alex said it's ready. They're just waiting on SSP to come move their oil cooler thing from the bumper cause that's where they put the heat exchanger for the SC kit.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
        No, but Alex said it's ready. They're just waiting on SSP to come move their oil cooler thing from the bumper cause that's where they put the heat exchanger for the SC kit.
        Well Alex is supposed to call Kris@SSP to schedule SSP coming down. I hope he did it as I txt'd him the number today but I doubt it.