Close

    • 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. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Q4P Click here to enlarge
        Shiv's gone silent because he's probably working like a monkey to get a solution and to avoid questioning at all costs.
        You think this is more plausible than my breast implants theory? Vishnu does cater to a lot of babies...
      1. tmo335tt's Avatar
        tmo335tt -
        Click here to enlarge Originally Posted by Q4P Click here to enlarge
        Shiv's gone silent because he's probably working like a monkey to get a solution and to avoid questioning at all costs. This is his style; he must know it wont be long before customers get really disgruntled and no longer stay silent. I think 3 sold cars and no performers prove this.

        I don't know about 3, I think my frustration accounts for one of those three. Seriously i was ready to throw in the towel until now. I'm impressed that Dzenno has stuck with it as long as he has. Its not fun to have a problem that you can't figure out especially after dropping a lot of money on it.
      1. CaptainInsano's Avatar
        CaptainInsano -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        You think this is more plausible than my breast implants theory? Vishnu does cater to a lot of babies...
        Now who's acting childish Click here to enlarge You were very hospitable yesterday, seeing the home page this morning shows your bias. Something tick you off?
      1. CaptainInsano's Avatar
        CaptainInsano -
        What happened to this thread...

        Good luck to those pushing the platform, and to those who have been waiting for a misfire fix for years.
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by CaptainInsano Click here to enlarge
        What happened to this thread...

        Good luck to those pushing the platform, and to those who have been waiting for a misfire fix for years.
        You are a manual trans and don't have misfire issues, right? So doesn't that blow the "all manual trans misfire over xyz whp" theory out of the water?
      1. DefactoM6's Avatar
        DefactoM6 -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        You are a manual trans and don't have misfire issues, right? So doesn't that blow the "all manual trans misfire over xyz whp" theory out of the water?
        He does have an FX850...that's single mass (assuming tmo335 is still barking up the DMFW tree)
      1. ChuckD05's Avatar
        ChuckD05 -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        When the weather clears up the firmware is here ready to email! Click here to enlarge
        I leave work at 4-4:30 and the road should be DRY but it will be rush hour traffic on the LIE but I will hit the service roads ... never been more excited to go drive my car before... I hope to come back and confirm my flatline which happens every single time i shift prior to the latest firmware T sent is gone... crossing my fingers...
      1. mithiral67's Avatar
        mithiral67 -
        I would happily accept a fix independent of its source and I would hope anyone with the knowledge of said fix wouldn't hold it back due to the asshats in the world. I hope it would benefit more of the non-asshats, but you never know if the population mix allows for that.
      1. tmo335tt's Avatar
        tmo335tt -
        I'll say that it really has to do with interference
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        I really doubt its the DMFW...anything is possible and yes those that don't misfire are running single mass but i really don't think that'd be the case as the misfire wouldn't be boost dependent
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by DefactoM6 Click here to enlarge
        He does have an FX850...that's single mass (assuming tmo335 is still barking up the DMFW tree)
        I see. I've never been a fan of them due to the complexity involved. KISS. Click here to enlarge I would think if it was slipping under the higher loads the first indicator would be random small RPM spikes in logs. I don't see how a flywheel problem would impact bank2 only either. But if all the cars with a DMFW are misfiring and all those without it are not, maybe you are on to something.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by CaptainInsano Click here to enlarge
        Now who's acting childish Click here to enlarge You were very hospitable yesterday, seeing the home page this morning shows your bias. Something tick you off?
        What new bias? My tone has been consistent. It's a joke, and I find the idea of Vishnu fanboys sucking Shiv's teets hilarious.
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by tmo335tt Click here to enlarge
        I'll say that it really has to do with interference
        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.
      1. amclint's Avatar
        amclint -
        It's a thing of beauty to watch a forum get trolled, congrats to tmo335tt.

        And lol at Shiv's new 'modifications', now how long before someone puts up a photoshop image and makes the thread NSFW Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by amclint Click here to enlarge
        And lol at Shiv's new 'modifications', now how long before someone puts up a photoshop image and makes the thread NSFW
        Thanks to NWS tags it's rather impossible to make a thread NSFW here.

          Click here to enlarge NWS:  
        see?
      1. fast4door's Avatar
        fast4door -
        Click here to enlarge Originally Posted by amclint Click here to enlarge
        It's a thing of beauty to watch a forum get trolled, congrats to tmo335tt.
        lol...thats what I was thinking..I think this guy just trolled the $#@! out of everyone lol
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by fast4door Click here to enlarge
        lol...thats what I was thinking..I think this guy just trolled the $#@! out of everyone lol
        Guys, he isn't trolling.
      1. nafoo's Avatar
        nafoo -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Thanks to NWS tags it's rather impossible to make a thread NSFW here.

          Click here to enlarge NWS:  
        see?
        What a tease.

          Click here to enlarge NWS:  
        Click here to enlarge
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by amclint Click here to enlarge
        It's a thing of beauty to watch a forum get trolled, congrats to tmo335tt.

        And lol at Shiv's new 'modifications', now how long before someone puts up a photoshop image and makes the thread NSFW Click here to enlarge
        Trevor used to be a customer and he's a good guy and a real enthusiast. I'm sure he's just frustrated with the car and trying to find a solution like anyone else in his situation would be.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        On the manual trans misfires, in my experience it's different every time. We have a few manual cars putting out 500-520rw without reporting any misfire codes so I'd be surprised if there was some inherent hardware issue that affects all manual transmission cars in that power range. Beyond that power level I have not personally explored much so I'll defer to those who have. I do understand the mechanics and electronics of the N54 very well so if anyone wants to throw a theory out I'd be happy to give it a thumbs up or thumbs down.
        But how many of those cars are making 520whp over 6500rpm?