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    • Trouble in paradise? Vishnu/FFtec N54 335ii Single Turbo kits experiencing issues as a BimmerBoost member runs 12.5@121 with misfires and having to short shift

      BimmerBoost would like to thank member GeorgiaTech335Coupe for his openness and honesty regarding his Vishnu/FFTEC single turbo setup. Recently, this member took his single turbo upgraded 6-speed manual 335i to the PBIR (Palm Beach International Raceway) dragstrip in Florida to do some testing. His best run was a 12.50@121.6 alongside a 12.8@117. Yes, these times are quite a ways away from the 10.8@131 glory pass from Vishnu demonstrating the kits capability.


      This is in no way the fault of GeorgiaTech335Coupe who experienced misfires on his car and had to short shift at 6300 rpm in order to avoid them. Now, Vishnu has basically portrayed this kit as perfect and ready for sale with nobody having any issues. The reason BimmerBoost is bringing this issue to the attention of the community is for potential buyers to understand what they are getting into.


      There is absolutely nothing wrong with having issues when modifying a car to this level and BimmerBoost is confident Vishnu will resolve them. There is something wrong with pretending nothing is wrong. A few cars with the single turbo kits have gone up for sale and apparently a total of three people, that are willing to open their mouths, are having misfire issues with these kits.

      These issues will no doubt get resolved but potential buyers and current customers needs to be aware of the process, effort, and that progress is being made. Pretending nothing is wrong and collecting money simply is the wrong way to go about this and once again (it's becoming a trend) BimmerBoost is the only site bringing these issues to the attention of the community.

      For the record, a member by the name of @tmo335tt says he has a hardware solution for the misfires that he will likely share with Vishnu (hopefully not for free). Interesting that it isn't Vishnu but the community solving this.

      Thanks again to @GeorgiaTech335Coupe for sharing his details, good or bad, as we all learn thanks to honesty and openness. There is more to tuning than just collecting money.

      This article was originally published in forum thread: Vishnu Single Turbo at PBIR - 12.50@121.6 having to shift all gears at 6300rpm started by Sticky View original post
      Comments 1090 Comments
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by GetSomeE92 Click here to enlarge
        Yup. Was just able to confirm. Look at Page 10 of the PDF: http://www.nhra.com/UserFiles/file/2...Amendments.pdf

        "NHRA DRAGS: STREET LEGAL STYLE PRESENTED BY AAA (Page xiv) (5th paragraph)
        Additionally requirements and specifications for Street Legal are the same as those for the Summit Racing Series with the following exception: Unaltered 2008 OEM model year and newer production cars running slower than 9.99 and 135 mph do not have to meet the requirements and specifications for the Summit Racing Series except for the following: Convertibles and T-tops must meet Summit Racing Series Roll Bar and Roll Cage requirements, All drivers must meet the Summit Racing Series Helmet and Protective Clothing requirements."

        The question will be what qualifies as "unaltered". I'm not so sure an aftermarket turbo system will satisfy the "unaltered" requirement of the amendment. This may just be for the stock low 11 and 10 second cars that are out there.
        It should cover all. The rationale behind the amendment is the increasing safety in the design of the frame, which eliminates the need for a roll bar. The unadultered probably just pertains to the actualy body of the car.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        @tmo335tt deserves the credit.

        He found this article:
        http://papers.sae.org/2007-01-3544/
        which was authored by LuK GmbH & Co. oHG who makes dual mass flywheels for our cars.

        He then put an oscilloscope on his car while on they dyno and saw the interference.
        He def is very knowledgeable and mechanically inclined, much more than a lot of people on this forum.
      1. Sticky's Avatar
        Sticky -
        Shiv shiv shiv, you must be confused as to what forum you are on.
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Reply to Shiv's earlier post:

        Yes, as discussed before I do run a dual mass flywheel. However, I'm not sure why you didn't give full credit to @tmo335tt for figuring this out for you. Also, you haven't tested this just yet and confirmed 100% as the flywheels are on order. Once you do and the misfires do go away let's call it the solution then.

        If this is resolved with a single mass flywheel a huge thanks to @tmo335tt is deserved by the N54 6MT community as his persistence is the reason why we have this idea as well as testing in the first place.

        EDIT: BMW's 1M flywheel is also dual mass only a bit lighter. There is no evidence of them doing that to get around their own misfire detection algorithms.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Since Shiv's post is deleted:

        The problem is the stock DMFW. At these power levels it is causing interference with the CPS, as the two pieces are spinning at different angular velocities.

        All the cars that are running fine: Shiv's, CaptainInsano's, FBIS all have a SMFW. My car, tmo335tt, and the other guy all have the DMFW. Dzenno had a DMFW I believe.
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Since Shiv's post is deleted:

        The problem is the stock DMFW. At these power levels it is causing interference with the CPS, as the two pieces are spinning at different angular velocities.

        All the cars that are running fine: Shiv's, CaptainInsano's, FBIS all have a SMFW. My car, tmo335tt, and the other guy all have the DMFW. Dzenno had a DMFW I believe.
        Hope this works! Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Since Shiv's post is deleted:

        The problem is the stock DMFW. At these power levels it is causing interference with the CPS, as the two pieces are spinning at different angular velocities.

        All the cars that are running fine: Shiv's, CaptainInsano's, FBIS all have a SMFW. My car, tmo335tt, and the other guy all have the DMFW. Dzenno had a DMFW I believe.
        Nobody is running a lightweight or single flywheel?
      1. LostMarine's Avatar
        LostMarine -
        interesting.. so AT's have DMFW's now..? hhmm.. learn something new every day
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Nobody is running a lightweight or single flywheel?
        None of us 3 with the problem are. Shiv and CaptainInsano who aren't experiencing the problem are running a lightweight flywheel.

        I ordered one today and so did tmo335tt.
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        None of us 3 with the problem are. Shiv and CaptainInsano who aren't experiencing the problem are running a lightweight flywheel.

        I ordered one today and so did tmo335tt.
        Which flywheel did you go with?
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        interesting.. so AT's have DMFW's now..? hhmm.. learn something new every day
        Who said anything about an AT? None of us 3 have ATs.
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        LM, AT's don't misfire up top.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        None of us 3 with the problem are. Shiv and CaptainInsano who aren't experiencing the problem are running a lightweight flywheel.

        I ordered one today and so did tmo335tt.
        Excellent, that sounds like a simple fix.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        Which flywheel did you go with?
        Spec AL with 2+ clutch. Was really struggling on either the 2+ or 3+. In the end I went with 2+ because a lot of other people run it with no issues and I couldn't find any info on 3+. Not willing to be the guinea pig after this crap ACT.
      1. Sticky's Avatar
        Sticky -
        @tmo335tt Has Vishnu compensated you for time, the parts, money, etc.? You are the one responsible for this after all, the great Shiv bumbling about and not being able to solve it. He has you to thank.
      1. amclint's Avatar
        amclint -
        Sheesh, what a mess. Hoping to see a full power 1/4 mile pass soon! Also very nice about the new NHRA rules, now I just need a car that will run deep 10s Click here to enlarge
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        EDIT: BMW's 1M flywheel is also dual mass only a bit lighter. There is no evidence of them doing that to get around their own misfire detection algorithms.
        Great point, but it lends itself to showing this is the problem. The 1M has a revised dual mass flywheel, that the 335 does not have. Seems like BMW knew something.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        learn something new every day
        Why am I not surprised?
      1. bigdnno98's Avatar
        bigdnno98 -
        I ran the Spec stage 3+ with LWFW on my 335i (440HP/480TQ). I loved the clutch. I hated the flywheel. It was super loud and chatty. The clutch engagement starts kind of low but ends up top unlike ACT. It actually engages a little higher than stock which took a little getting used to but overall I loved the clutch. It's no twin disk, which I have now. After driving a Spec stage 3 + and a twin disk clutch i will definately recommend spending the extra money and getting the twin disk. It is an amazing clutch!!!!! I currently have an exedy twin disk, not sure if they make any for BMWs but I'm pretty sure one ST guy has a twin disk and loves it.

        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Spec AL with 2+ clutch. Was really struggling on either the 2+ or 3+. In the end I went with 2+ because a lot of other people run it with no issues and I couldn't find any info on 3+. Not willing to be the guinea pig after this crap ACT.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        LM, AT's don't misfire up top.
        wanna bet?