• 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. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        It's one of those things I'd have to do here on a non-rushed timeframe. Would need a car for maybe a week or so. Click here to enlarge

        But maybe wait it out for more single track times on autos. So far I think the RBs might put down better ETs.
        any idea what it would cost to ship you my car?

        i work 2 on 2 off in alaska so time is my friend lol
      1. BuraQ's Avatar
        BuraQ -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        Im telling you lol

        im this close to pulling the trigger on the Custom 6266 project but all this nonsense has me hesitating. The offer still stands, ill buy you a round trip flight to florida to figure the boost control out. If you accept ill pull the trigger and put the car in the shop to get built Click here to enlarge The car would be ready for boost control by the end of January ish if i pull the trigger

        other wise i guess im going RBs lol

        I know we can run off the wastegate fixed boost, but i want to have boost control as an insurance policy Click here to enlarge

        I really want to do this project but I will not go the FFTec / vishnu route lol
        If you decide to go the ST route ship your car to Terry, I am sure you two can work something out at the end that will benefit both of you.
      1. rudypoochris's Avatar
        rudypoochris -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        any idea what it would cost to ship you my car?

        i work 2 on 2 off in alaska so time is my friend lol
        Usually around $800 each way, maybe less, but the real $#@! is dealing with the shipping companies. I shipped a car to Iraq once. That was interesting.
      1. Ak335i's Avatar
        Ak335i -
        @Terry@BMS

        if its in the 800$ each way ballpark, ill ship.. are you in?
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        any idea what it would cost to ship you my car?

        i work 2 on 2 off in alaska so time is my friend lol
        Fairly expensive. I bet $1500ish round trip. But no problem tuning it if you ship it down. Just make sure it's running well otherwise and not leaking anything. You can pay for the shipping fees and I'll send it home with a new AP and dyno charts. Click here to enlarge
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Fairly expensive. I bet $1500ish.
        one way or roundtrip? lol

        edit it would ship from and back to florida
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Fairly expensive. I bet $1500ish round trip. But no problem tuning it if you ship it down. Just make sure it's running well otherwise and not leaking anything. You can pay for the shipping fees and I'll send it home with a new AP and dyno charts. Click here to enlarge
        K sounds like a deal.. you can have it as long as you need. You will work on boost controlling it correct?
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        K sounds like a deal.. you can have it as long as you need. You will work on boost controlling it correct?
        No I want to focus on more important things with it like angel eye development and BMS license plate frame design. Click here to enlarge
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        No I want to focus on more important things with it like angel eye development and BMS license plate frame design. Click here to enlarge
        ok youre on Click here to enlarge

        ill be in touch with you thru email again soon
      1. rader1's Avatar
        rader1 -
        Haha, holy $#@! this could be funny. Potentially the best running Vishnu ST cars will have nothing to with Shiv.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        Haha, holy $#@! this could be funny. Potentially the best running Vishnu ST cars will have nothing to with Shiv.
        N54 irony is awesome.
      1. Ak335i's Avatar
        Ak335i -
        mine will have nothing to do with FFTEC though Click here to enlarge completely custom
      1. rader1's Avatar
        rader1 -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        mine will have nothing to do with FFTEC though Click here to enlarge completely custom
        Interesting... How is the O2 sensor placement going to handled? To me, that's potentially the source of these misfires.
      1. Sorena's Avatar
        Sorena -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        No I want to focus on more important things with it like angel eye development and BMS license plate frame design. Click here to enlarge
        Bahahaha.Click here to enlarge
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        Interesting... How is the O2 sensor placement going to handled? To me, that's potentially the source of these misfires.
        Still hammering that out. Im at work in alaska now. With the way this plan looks now, ill get the car to the shop that weve been talking to right around or before Jan1 and when i know the exact details, there will not be any hiding or secrecy at all.
      1. rader1's Avatar
        rader1 -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        Still hammering that out. Im at work in alaska now. With the way this plan looks now, ill get the car to the shop that weve been talking to right around or before Jan1 and when i know the exact details, there will not be any hiding or secrecy at all.
        IIRC Shiv put the O2 sensors in the primaries of the mani pre-turbo and the N54(like a lot of engines) uses the O2 sensors as part of the misfire detection system. I'm thinking because the sensors are only really seeing exhaust gas from one cylinder of each bank it's thinking there i a misfire.

        Let's just say at x degrees of crank rotation it expects to see x AFR becuase cylinder x would've just fired, however it sees y AFRs and it thinks something's wrong in cylinder x.

        Could be something to keep in mind.
      1. bigdnno98's Avatar
        bigdnno98 -
        This is getting interesting. This is what I've been waiting on a ST kit tuned by someone other than shiv. Popcorn ready Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        IIRC Shiv put the O2 sensors in the primaries of the mani pre-turbo and the N54(like a lot of engines) uses the O2 sensors as part of the misfire detection system. I'm thinking because the sensors are only really seeing exhaust gas from one cylinder of each bank it's thinking there i a misfire.

        Let's just say at x degrees of crank rotation it expects to see x AFR becuase cylinder x would've just fired, however it sees y AFRs and it thinks something's wrong in cylinder x.

        Could be something to keep in mind.
        I think you may be on to something. Crank offset could induce misfires so this would not be all that different in that case.
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        IIRC Shiv put the O2 sensors in the primaries of the mani pre-turbo and the N54(like a lot of engines) uses the O2 sensors as part of the misfire detection system. I'm thinking because the sensors are only really seeing exhaust gas from one cylinder of each bank it's thinking there i a misfire.

        Let's just say at x degrees of crank rotation it expects to see x AFR becuase cylinder x would've just fired, however it sees y AFRs and it thinks something's wrong in cylinder x.

        Could be something to keep in mind.
        I can tell you with certainty that AFR isn't part of the equation. It does have to do with the CPS sensor and the DME monitoring the speed of the crankshaft for sudden slow downs (which would make the DME think there was a misfire). What else is part of that equation I don't know but I've had AFR vary from 11 to 12.5 anywhere in that range and stay solid on both banks with trims at near zero and it'd still happen with misfire detection turned on. Its not his o2 sensor placement as it happens with o2 sensors post turbo as well.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        IIRC Shiv put the O2 sensors in the primaries of the mani pre-turbo and the N54(like a lot of engines) uses the O2 sensors as part of the misfire detection system. I'm thinking because the sensors are only really seeing exhaust gas from one cylinder of each bank it's thinking there i a misfire.

        Let's just say at x degrees of crank rotation it expects to see x AFR becuase cylinder x would've just fired, however it sees y AFRs and it thinks something's wrong in cylinder x.

        Could be something to keep in mind.
        Hmm. A good friend of mine who is a very well known tuner/mechanic/drag racer in the Ford/Supra/Subaru world over here in Orlando suggested that the O2 placement might be causing some issues. He was concerned with the fact that there was an extender for the O2 and that the O2 wasn't directly in the path of the exhaust. He thinks that will cause the O2 to not read properly and that it could foul much quicker as it is not seeing exhaust flow to clean it.