Close

    • 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. Linracing's Avatar
        Linracing -
        This sucks. Sorry to hear this man.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by keikdasneak Click here to enlarge
        This sucks. Sorry to hear this man.
        It's cool it will get resolved.
      1. Flinchy's Avatar
        Flinchy -
        Ohhh $#@!, Click here to enlarge

        finally looking good and the trans builder (the title of the thread even) bails on you after failing?

        good luck, be interesting to read about the outcome Click here to enlarge
      1. jjv104's Avatar
        jjv104 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Oh I didn't realize they had them separately that's what I was actually planning to do.

        You have to buy the whole clutch assembly which includes both clutches. Here is the link to realoem:

        http://realoem.com/bmw/showparts.do?...07&hg=28&fg=15

        Item 5, PN 28407842841
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by jjv104 Click here to enlarge
        You have to buy the whole clutch assembly which includes both clutches. Here is the link to realoem:

        http://realoem.com/bmw/showparts.do?...07&hg=28&fg=15

        Item 5, PN 28407842841
        Thanks, am I a retard because I can't find the price?
      1. benzy89's Avatar
        benzy89 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Thanks, am I a retard because I can't find the price?
        Gotcha your back, just needed the part number.

        $1940 from BMWPartsSupply.com or if that's not official enough for you, $2425 from BMW of South Atlanta. Could also contact Tischer & get their pricing.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by benzy89 Click here to enlarge
        Gotcha your back, just needed the part number.

        $1940 from BMWPartsSupply.com or if that's not official enough for you, $2425 from BMW of South Atlanta. Could also contact Tischer & get their pricing.
        That's not bad at all and a possibility.
      1. LostMarine's Avatar
        LostMarine -
        bmw south atlanta one is not for e9x
      1. jjv104's Avatar
        jjv104 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Thanks, am I a retard because I can't find the price?
        They didn't list the price. Sometimes they don't. Call the dealer.
      1. akh23456's Avatar
        akh23456 -
        you should try to see how close the new M5 dct clutches are to the e9x dct because i bet the new M5 dct clutches are stronger.
      1. lulz_m3's Avatar
        lulz_m3 -
        Click here to enlarge Originally Posted by akh23456 Click here to enlarge
        you should try to see how close the new M5 dct clutches are to the e9x dct because i bet the new M5 dct clutches are stronger.
        Great suggestion! Sorry to hear about this sticky, GL man.
      1. M3_WC's Avatar
        M3_WC -
        Click here to enlarge Originally Posted by benzy89 Click here to enlarge
        Gotcha your back, just needed the part number.

        $1940 from BMWPartsSupply.com or if that's not official enough for you, $2425 from BMW of South Atlanta. Could also contact Tischer & get their pricing.
        Looked up part number on Tischer - $1938
      1. benzy89's Avatar
        benzy89 -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        bmw south atlanta one is not for e9x
        Yea they are, just scroll down Product Fitment/Applications and you'll see
        BMW 3 Series (E21,E30,E36,E46,E90,E91,E92,E93) M3 Convertible 2007, 2008, 2009, 2010, 2011, 2012
        BMW 3 Series (E21,E30,E36,E46,E90,E91,E92,E93) M3 Coupe 2007, 2008, 2009, 2010, 2011, 2012
        BMW 3 Series (E21,E30,E36,E46,E90,E91,E92,E93) M3 Sedan 2007, 2008, 2009, 2010, 2011, 2012
      1. ZooyorQ's Avatar
        ZooyorQ -
        Click here to enlarge Originally Posted by akh23456 Click here to enlarge
        you should try to see how close the new M5 dct clutches are to the e9x dct because i bet the new M5 dct clutches are stronger.
        They both use the same clutch pack. P/N: 28407842841

      1. MisterEm's Avatar
        MisterEm -
        Click here to enlarge Originally Posted by ZooyorQ Click here to enlarge
        They both use the same clutch pack. P/N: 28407842841
        Very interesting.... Twin Turbo V8 with 50% more torque using the same clutch system as the N/A 4.0 screamer?

        I smell big things for the DCT S65 owners!
      1. ZooyorQ's Avatar
        ZooyorQ -
        Click here to enlarge Originally Posted by MisterEm Click here to enlarge
        Very interesting.... Twin Turbo V8 with 50% more torque using the same clutch system as the N/A 4.0 screamer?

        I smell big things for the DCT S65 owners!
        I imagine the difference being the transmission appears to be the same, and the clutch packs.. is how the pressure is applied. Just as mentioned earlier you can program the transmission to apply more pressure to the pressure plates. I believe this is the same dct tranny as in the 135i/is and the 335i. Each most likely programmed differently.

        .. I think the biggest take away here is that there's a market for upgrades due to cross platform usage.

        If each tranny was unique in such a way that r&d for the mechanical parts needed to be done on EACH model I'd say it would be a tough sell to someone like Shep or Dodson. But being its the same tranny in about 5 models, I see a market.

        Hopefully we can convince one of them to invest some R&D.
      1. benzy89's Avatar
        benzy89 -
        So it's all in the programming Click here to enlarge Someone with access to an E9x M3 DCT + F10 M5/F12 M6 with the DCT should cross reference the DCT files and look for differences in programming. Would be a simple mod to just retrofit the M5/M6 DCT programming to an E9x M3 and get an additional 200 Ft Lb of TQ with some simple software changes.
      1. ZooyorQ's Avatar
        ZooyorQ -
        Click here to enlarge Originally Posted by benzy89 Click here to enlarge
        So it's all in the programming Click here to enlarge Someone with access to an E9x M3 DCT + F10 M5/F12 M6 with the DCT should cross reference the DCT files and look for differences in programming. Would be a simple mod to just retrofit the M5/M6 DCT programming to an E9x M3 and get an additional 200 Ft Lb of TQ with some simple software changes.
        Has anyone stuck with the oem clutch packs and had programming done? I know someone mentioned they had the upgraded packs and then someone also attempted to program the transmission control to be more aggressive. I have to imagine part of it is torque reduction during shifts, I'm willing to bet the M5 has a bigger torque reduction between shifts. You'd be surprised what a clutch can hold once engaged (with minimal slip). The full face fermaic clutches from southbend (HPF calls them the "HPF Stage 1-3 Clutch") slip like butter but once fully engaged can hold a tremendous amount of power with only a single disk.


        Edit: Key being.. don't allow it to slip. Once it slips a little it will give out quickly.
      1. benzy89's Avatar
        benzy89 -
        Click here to enlarge Originally Posted by ZooyorQ Click here to enlarge
        Has anyone stuck with the oem clutch packs and had programming done?
        AFAIK, nobody's figured out the DCT programming
      1. BMWJunkie's Avatar
        BMWJunkie -
        http://www.esstuning.com/products/E9...-Software.html

        They told me there was no market for the 335is dct trans though, even though its the same...hmmm.

        Really wish someone could program my launch control to 3,000 rpm.