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    • First high torque N54 (335i/135i) steptronic transmission build completed by Level 10 Transmisisons - ~700 pound-feet capable

      As many of you know, BimmerBoost user LostMarine got his 335i Steptronic transmission built by Level 10 to handle increased torque as his upgraded turbos took their toll on the stock transmission. Turn around time was surprisingly quick and should be 10 days and under for all N54 transmission builds. LostMarine had the transmission built along with upgrading the torque converter with a higher stall and the valve body. Price will vary depending on options.

      In Lost Marine's words:

      So here are the details I can speak of. Car runs strong, very solid and strong now. Much improved over what I can remember even when I first bought the car. Here she is as the short journey began. Luckily the car was only down for about 1-1/2 weeks










      Clutches were fried in mine as you can see from this pic.


      They were replaced with stronger material obviously. Now rated up to 700ft/lbs




      Tq convertor was setup for mild street use and increased stall RPM by 500.


      Sorry no more pics on that

      VB Pressure was increased from the stock 60-70psi to 130 psi.

      Pump volume was also increased in total flow from 2qt's/30 seconds to 3 qt's/30 second

      All of this translates in the much stronger and firmer shifting that I have been noticing.

      I have to say, for being a BMW and asking for a mild street use Transmission , Level 10 Delivers.

      The higher stall has nearly no affect on the DD driving characteristics of the car. I do not feel any "slack", and had i not known the stall was increased, I could never tell.

      I had planned on attaching video of the car/trans going through the gears, but the angle was way off. I attempted to have it catch the sound and speedo/Tach so you could see the correlation, along with Datalogs. The roads today were not easily manuevered though.

      This article was originally published in forum thread: First high torque N54 (335i/135i) steptronic transmission build completed by Level 10 Transmisisons - ~700 pound-feet capable started by Sticky View original post
      Comments 64 Comments
      1. Forcefed's Avatar
        Forcefed -
        Wow, your car is quick. Nice videos.
      1. paulmcmn's Avatar
        paulmcmn -
        Click here to enlargeClick here to enlargeClick here to enlargeClick here to enlargeClick here to enlargeClick here to enlargeClick here to enlargeClick here to enlarge
      1. GTiceman's Avatar
        GTiceman -
        glad to see things are back in shape LM
      1. RTA's Avatar
        RTA -
        Hi LM,

        Did you receive your software update in the meanwhile? Would you mind to provide me / us an experience describtion based on your observations and butt dyno after this major update?
        I mentioned before that I'm extremly interested in this solution as mine AT is in his end of life stage... (Slipping upon acceleration).

        Thanks and enjoy! Good to hear that they delivered as promissed!
      1. LostMarine's Avatar
        LostMarine -
        no update on software yet. i have been to busy to even worry about it. Ill call on monday and see if they are ready for me. trans is 98-99% perfect, id just liike a few things a bit more aggressive is all
      1. Terminator-N54's Avatar
        Terminator-N54 -
        Seems to lock the gears harder awesome job.
      1. enrita's Avatar
        enrita -
        My AT is officially shot. When doing pulls 2-5 gears it does not want to go from 4th to 5th anymore :-( lost now 3 seconds from my last year runs ... Looking forward to upgrade it as well!
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by enrita Click here to enlarge
        My AT is officially shot. When doing pulls 2-5 gears it does not want to go from 4th to 5th anymore :-( lost now 3 seconds from my last year runs ... Looking forward to upgrade it as well!
        You going the same route or having someone in Europe do it?
      1. enrita's Avatar
        enrita -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        You going the same route or having someone in Europe do it?
        same route, LEVEL 10 FTW. Will be sent there 2 week of august.
      1. LostMarine's Avatar
        LostMarine -
        Just be sure to specify what, if any stall increase. i havent had a chance to try launching yet so i cant say how it reacts
      1. Terminator-N54's Avatar
        Terminator-N54 -
        Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
        I've heard that a properly matched upgraded torque converter can be good for nearly a half second reduction in 1/4 mile times. If they properly matched the converter to his powerband, he should be able to leave the line under very high boost.
        +1 going to be awesome!
      1. enrita's Avatar
        enrita -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        Just be sure to specify what, if any stall increase. i havent had a chance to try launching yet so i cant say how it reacts
        Yeah, level 10 told me they need to see first my transmission and from that they will know exactly what needs to be done.... I specified also the use i do which is street, track and 30 mph rolls starts.
        I was in a stage 3 at today and noticed very clearly how bad mine is....
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by enrita Click here to enlarge
        same route, LEVEL 10 FTW. Will be sent there 2 week of august.
        Sounds awesome, let us know how it goes.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by enrita Click here to enlarge
        Yeah, level 10 told me they need to see first my transmission and from that they will know exactly what needs to be done.... I specified also the use i do which is street, track and 30 mph rolls starts.
        I was in a stage 3 at today and noticed very clearly how bad mine is....
        yea, if you dont plan on tracking, id say tell them no dragstrop launches and just want stronger and faster shifting. im sure you'll get the same parts as mine, just stock stall
      1. karun2000's Avatar
        karun2000 -
        Is the level 10 transmission still running well?

        how many miles have you covered with what whp/wtq?
      1. alex@ABRhouston's Avatar
        alex@ABRhouston -
        probably looking at an X5 trans
      1. 135pats's Avatar
        135pats -
        Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
        probably looking at an X5 trans
        Could you expand on that? Have not given that any thought, would the bellhousings match?
      1. alex@ABRhouston's Avatar
        alex@ABRhouston -
        N54's came in x5's- they have a metal pan.
      1. Linracing's Avatar
      1. 135pats's Avatar
        135pats -
        Click here to enlarge Originally Posted by alex@ABRhouston Click here to enlarge
        N54's came in x5's- they have a metal pan.
        Whoa, I had no idea. Shows you what I know about SUVs lol.