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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 -
        Click here to enlarge Originally Posted by Autobahn335i Click here to enlarge
        It takes less time to travel to mars and back than it takes to build Sticky's car. Just sayin'...
        NASA isn't working on my car.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by oldgixxer Click here to enlarge
        LOL! Maybe he should get the NASA rocket scientists who built the lunar explorer to figure out the transmissionClick here to enlarge
        The space shuttle would still be in operation if it had an awesome DCT.
      1. oldgixxer's Avatar
        oldgixxer -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        The space shuttle would still be in operation if it had an awesome DCT.
        Lol,you just redeemed yourself with that comment broClick here to enlarge
        Hope the car is done soon i wanna see it in actionClick here to enlarge
      1. BigM62's Avatar
        BigM62 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        No he doesn't.
        +1. Custom one off work by another shop takes much longer.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by BigM62 Click here to enlarge
        +1. Custom one off work by another shop takes much longer.
        People don't understand.
      1. MisterEm's Avatar
        MisterEm -
        how many miles on the break in?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by MisterEm Click here to enlarge
        how many miles on the break in?
        I would say no more than 500 should be good, it's more of how you break it in.
      1. MisterEm's Avatar
        MisterEm -
        I was not clear enough. How far into YOUR break-in are you?

        On another note... I was always told to drive it like you stole once at operating temperature. Bounce off the rev limiter or float the valves in order to seat those rings properly. But I started with pushrod V8's....
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by MisterEm Click here to enlarge
        I was not clear enough. How far into YOUR break-in are you?
        0

        Click here to enlarge Originally Posted by MisterEm Click here to enlarge
        On another note... I was always told to drive it like you stole once at operating temperature. Bounce off the rev limiter or float the valves in order to seat those rings properly. But I started with pushrod V8's....
        I believe in driving it harder rather than babying it.
      1. BigM62's Avatar
        BigM62 -
        Not to disagree, but all my BMW techs over the years to go easy first 500 miles, not baby miles, but diff. not bounce it off the limiter. I even discussed this with my engine builder Rebello Racing ( JE pistons/custom FI cams/ S62 crankshaft/ p-n-p heads ).
      1. fastgti69's Avatar
        fastgti69 -
        With every new engine build esp sleeved they recommend not going over 4k rpm for first 500 miles. I've even read not to use synthetic oil for the fist 1000 miles because it works so well it wont break the engine in properly LOL. I mean it's all different cause this is an m3. Just the stuff I've been reading cause I'm looking to build my motor now. Sleeved up and all. Click here to enlarge
      1. Sorena's Avatar
        Sorena -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        0



        I believe in driving it harder rather than babying it.
        It's not a factory engine anymore, babying it is the only way to do.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Sorena Click here to enlarge
        It's not a factory engine anymore, babying it is the only way to do.
        Whatever, we'll see what they do.
      1. bobS's Avatar
        bobS -
        I would do whatever the shop tells you so if it has a problem right off the get go, it's on them.
      1. PEI330Ci's Avatar
        PEI330Ci -
        Click here to enlarge Originally Posted by BigM62 Click here to enlarge
        Not to disagree, but all my BMW techs over the years to go easy first 500 miles, not baby miles, but diff. not bounce it off the limiter. I even discussed this with my engine builder Rebello Racing ( JE pistons/custom FI cams/ S62 crankshaft/ p-n-p heads ).
        Just another point of comparison: Porsche hammers the heck out of all of their models on a chassis dyno before shipping each car to dealers.
      1. Sticky's Avatar
        Sticky -
        Well it's going to be a while longer. Not going to get into it but on the bright side I get to change something I wanted to change.
      1. benzy89's Avatar
        benzy89 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Well it's going to be a while longer. Not going to get into it but on the bright side I get to change something I wanted to change.
        Bigger blower?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by benzy89 Click here to enlarge
        Bigger blower?
        No I'm already at about the biggest that can fit.
      1. TrippinBimmer's Avatar
        TrippinBimmer -
        A cookie stove? So it will bake cookies while driving hard Click here to enlarge
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by TrippinBimmer Click here to enlarge
        A cookie stove? So it will bake cookies while driving hard Click here to enlarge
        pretty sure if you would have mentioned adding it to the trans, it wouldnt be a far of assumption Click here to enlarge