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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. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        So both cars are over there running but yet i thought the heads were opened up saving the world LOL

        Or wait maybe youre just wasting the battery to have the lights on, my bad playa Click here to enlarge

        oh snap..
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by tmo335tt Click here to enlarge
        LOL reply of the year! This thread rocks
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        oh snap..
        damn the luck

        Or wait its fixed and put back together.
        //end thread
      1. Q4P's Avatar
        Q4P -
        lololololol

        picture is awesome
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        damn the luck

        Or wait its fixed and put back together.
        //end thread

        yup, it went from weeks of no known fix, to 1 post then a braingasm idea, to apart, inspected, parts ordered, parts arrived,installed fixed, buttoned up, and running smoothly in 24 hours..
      1. BuraQ's Avatar
        BuraQ -
        Click here to enlarge Originally Posted by Q4P Click here to enlarge
        I've said this once and I'll say it again...Misfires aside, this chassis is terrible at power levels above the mid 400's. You get terrible suspension, drivetrain, transmission issues and reliability issues past that level. We will not see a consistent 10 second 335i full street car ever... The fact that Shiv is the only one that has done 10's with essentially a drag setup is further proof... I wish the best of luck to all ST owners.
        I disagree with that sentence. Again this is opinion and it will be noted for later
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by BuraQ Click here to enlarge
        I disagree with that sentence. Again this is opinion and it will be noted for later
        Sub'd for later Click here to enlarge
      1. CaptainInsano's Avatar
        CaptainInsano -
        Click here to enlarge Originally Posted by tmo335tt Click here to enlarge
        Bahaha Click here to enlarge
      1. Eleventeen's Avatar
        Eleventeen -
        Click here to enlarge Originally Posted by BuraQ Click here to enlarge
        I disagree with that sentence. Again this is opinion and it will be noted for later
        I agree, running 10's is not magic; and hell, there are FWD street cars out there doing it. That configuration is the LEAST conducive to accelerating quickly in a straight line.
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by BuraQ Click here to enlarge
        I disagree with that sentence. Again this is opinion and it will be noted for later
        +1
      1. rader1's Avatar
        rader1 -
        I love this $#@!ing thread. Tech talk punctuated by lulpics
      1. BuraQ's Avatar
        BuraQ -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge

        ....The DME has a fairly strong pull up on the CPS sensor and a good filtering algorithm. IMHO any signal noise would likely be interpreted as a missing tooth or gap error. You'd have to have the same noise in the exact same tooth the exact same way for several RPM to indicate misfire and I just don't see that happening every single time only under certain boost levels.

        It is possible the misfire detection is simply overly sensitive and that at certain power levels a certain amount of "rough running" is inherent in the system. The fix would be to desensitize the misfire detection algorithm via the flash. Since that isn't possible the short term fix would be to disable misfire detection all together.
        This should be added to the N54 Psalms.....well said
      1. Eleventeen's Avatar
        Eleventeen -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        There can only be one of two causes. Either the crankshaft is rotating at a slightly uneven speed, or it's not and the DME is picking up a mistimed signal. If you had CPS in play where you are reading and replicating the signal, possibly with reduced resolution, I'd say that is suspect #1. But, as I understand it many have bypassed it and the misfires continue.

        The DME has a fairly strong pull up on the CPS sensor and a good filtering algorithm. IMHO any signal noise would likely be interpreted as a missing tooth or gap error. You'd have to have the same noise in the exact same tooth the exact same way for several RPM to indicate misfire and I just don't see that happening every single time only under certain boost levels.

        It is possible the misfire detection is simply overly sensitive and that at certain power levels a certain amount of "rough running" is inherent in the system. The fix would be to desensitize the misfire detection algorithm via the flash. Since that isn't possible the short term fix would be to disable misfire detection all together.
        Terry, will you be able to turn off the misfire detection with the BMS flash (via Cobb)?
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
        Terry, will you be able to turn off the misfire detection with the BMS flash (via Cobb)?
        Sure, I can turn it off upon request. It's just a simple check box in the pro tuning interface.
      1. rader1's Avatar
        rader1 -
        It can be disabled in ATR also.Attachment 22919
      1. Eleventeen's Avatar
        Eleventeen -
        Wow, didn't expect it to be that easy...
      1. rader1's Avatar
        rader1 -
        Click here to enlarge Originally Posted by Eleventeen Click here to enlarge
        Wow, didn't expect it to be that easy...
        Yeah, ATR is no joke. It really is an amazing tool.
      1. Sigma 3's Avatar
        Sigma 3 -
        Click here to enlarge Originally Posted by Q4P Click here to enlarge
        They need to quit being girls; build the motor and stick a Gt4780 on. I mean they did say it was a modern supra; right? lol
        If I recall.. you said the same thing on the other form... just sayin
      1. rudypoochris's Avatar
        rudypoochris -
        The cost to get this car to 10s is ridiculous. It makes more sense to just get a base model Vette if that's hat people are aiming for. The limitation is the platform itself and the small displacement. If you want 10s on pump gas you are going to have big lag and it won't be a "street" car anymore. Never mind all the cash you need for LSD, suspension, clutch, axles (like really, why are they so damn weak), driveshaft, fuel pumpS, tunes, turbos, piping, intercooler, etc. I agree there will be daily drivers in the 10s. I wouldn't call them street cars though personally.
      1. Autobahn335i's Avatar
        Autobahn335i -
        This thread delivers!!