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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 bigdnno98 Click here to enlarge
        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.
        Where were you a couple hours ago? Lol. Oh well, I've only heard good things about 2+. My only concern is that the pedal pressure will be too light.
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Where were you a couple hours ago?
        If it wasnt such a secret a lot of people would have chimed in with flywheel suggestions lol
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Getting neg repped for making a sarcastic response to a sarcastic comment. Seems fair, lol.

        If I get neg repped too much I won't be able to post any of the 60-130 times or roll races I do the day my clutch gets broken in.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        If it wasnt such a secret a lot of people would have chimed in with flywheel suggestions lol
        touche
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Has anyone read the article (or abstract) that I linked? Comments or thoughts?
      1. bigdnno98's Avatar
        bigdnno98 -
        I wrote a review and posted it on here a few months ago Click here to enlarge

        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Where were you a couple hours ago? Lol. Oh well, I've only heard good things about 2+. My only concern is that the pedal pressure will be too light.
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Where were you a couple hours ago? Lol. Oh well, I've only heard good things about 2+. My only concern is that the pedal pressure will be too light.
        We literally just today posted up info on the SPEC Steel flywheel that most likely would've been and is a better option for most 6MT owners out there especially those looking to minimize chatter/noise (22lbs vs. 14lbs for aluminum) and have easier/smoother engagement daily driving. If anyone is interested in anything SPEC related including this new steel single mass flywheel let me know.

        http://www.protuningfreaks.com/drive...hes-flywheels/
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Getting neg repped for making a sarcastic response to a sarcastic comment. Seems fair, lol.

        If I get neg repped too much I won't be able to post any of the 60-130 times or roll races I do the day my clutch gets broken in.

        Im stoked for ya!
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Has anyone read the article (or abstract) that I linked? Comments or thoughts?
        I dont have enough rep points to read this entire thread plus an article in one day :/


        ill check it out tomorrow
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Has anyone read the article (or abstract) that I linked? Comments or thoughts?
        I read it. One thing that is still a bit puzzling is why the misfire happens always past 6k, always on bank2 and varies with boost by as much as +/-1psi...you can go up 1psi and consistently have the misfires and 1psi down and not have them...also, it won't happen in 1st or 2nd gear ever...it also won't happen in 3rd either if you start the pull at around 4.5-5k rpm and take it to redline but it will happen if you start the pull earlier than that...this is why i'm still a sceptic on this and i'm waiting on further testing on ALL 3 cars before i'll start to entirely believe in the possibility this is the fix
      1. JStang's Avatar
        JStang -
        Congrats on the fix. Brock, make a trip down to Bradenton again soon so I can check out the car (assuming this fixes it).
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        wanna bet?
        It's possible they could, but if you are using that as a reason to discredit the DMFW theory/solution then you are looking at it in the wrong way. Very similar to someone knowing that the equation for final velocity is v+at, but not knowing why that is the equation (derivation of the position equation with respect to time).

        The root of the problem is the CPS signal being interfered with by the DMFW. It is very possible that the AT's CPS is being interfered with by something else, which would yield a similar result. Or at least that is what the theory is based on and a way to harmonize the 2. We will know in a week.
      1. jpsimon's Avatar
        jpsimon -
        I love my spec stage 3 clutch and although the flywheel is noisy is feels great. I've had this combo for about 45k miles now with no issues (and no misfires ever, not that I have anywhere near the power). I would get the 22lbs one for sure just to minimize the sound if I were to do it again
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        I read it. One thing that is still a bit puzzling is why the misfire happens always past 6k, always on bank2 and varies with boost by as much as +/-1psi...you can go up 1psi and consistently have the misfires and 1psi down and not have them...also, it won't happen in 1st or 2nd gear ever...it also won't happen in 3rd either if you start the pull at around 4.5-5k rpm and take it to redline but it will happen if you start the pull earlier than that...this is why i'm still a sceptic on this and i'm waiting on further testing on ALL 3 cars before i'll start to entirely believe in the possibility this is the fix
        It is weird how the DME reacts the same way every time. My car will always misfire, even if I start my WOT past 4500rpm. I tested this exact scenario to be sure. I also get misfires in 2nd sometimes too (rarely tho). I think it has to do with the condition of the DMFW. I noticed that in the other guys car (only 20k miles) he sometimes did not get the misfire, where my car (60k miles) would always get the misfire. It seems to make sense that an aging DMFW might have more slop creating interferences with the CPS. The DMFW is spinning faster at higher rpms so that is why I think it is only present then.
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Certainly plausible. Really looking forward to you guys nuking this one.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        Certainly plausible. Really looking forward to you guys nuking this one
        Yes I hope so. I needed a new clutch anyway since the ACT is dragging, so it works out nicely.
      1. Terry@BMS's Avatar
        Terry@BMS -
        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.
        When you say interference what do you mean exactly? I have not read the article yet. But, if the dual mass is the cause, it seems it would have to be that it was causing actual uneven acceleration or running of the crankshaft. Not electrical interference for example. Either way I hope the fix works. Like I said I've never liked or used dual mass flywheels.
      1. tmo335tt's Avatar
        tmo335tt -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        @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.

        I'm not looking for anything in return...I saw that Shiv poseted and did thank me but I think you may have deleted it? It vanished right in front of us.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        When you say interference what do you mean exactly? I have not read the article yet. But, if the dual mass is the cause, it seems it would have to be that it was causing actual uneven acceleration or running of the crankshaft. Not electrical interference for example. Either way I hope the fix works. Like I said I've never liked or used dual mass flywheels.
        From the abstract:
        Typically misfire detection is performed using signals derived from the crankshaft position sensor, which works well for engines with a limited number of cylinders and which are connected to relatively simply drivelines. Torque reactions from the DMF or rest of the driveline can, in extreme circumstances, be misinterpreted as engine misfires, which never actually occurred.
      1. tmo335tt's Avatar
        tmo335tt -
        Now for all of the people who doubted me and said I was trolling? You are the real trolls. Feel free to insert your foot into your mout.



        You are welcome.