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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. Cn555ic's Avatar
        Cn555ic -
        With all do respect to everyone here...Lets just wait and see if this is the fix. In theory it can be the cause.
      1. rick@defiv's Avatar
        rick@defiv -
        Not to mention if I were to dump $thousands$ of dollars into said single turbo set up, I'd be looking for a bit more whp/tq than what's posted above. I'm looking further down the road...it's a power race that will keep escalating...It's at the end of the road for DME/piggyback interfaces.I was in the situation back in the late 90's with the supra's, community/producer communications eventually overcame that hurdle,now you're not $#@! in the supra community unless your over 1kwhp(and those are cave-man computers in relation to DME's). There aren't parts available atm to step past that 650hp reliably,back to back...there's some major conflicts to be addressed...they can be.It's highly unlikely that one shop is going to independently crack this little glass ceiling i see...
      1. Cn555ic's Avatar
        Cn555ic -
        Next would be an engine rebuild!
      1. rader1's Avatar
        rader1 -
        Click here to enlarge Originally Posted by rick@defiv Click here to enlarge
        Not to mention if I were to dump $thousands$ of dollars into said single turbo set up, I'd be looking for a bit more whp/tq than what's posted above. I'm looking further down the road...it's a power race that will keep escalating...It's at the end of the road for DME/piggyback interfaces.I was in the situation back in the late 90's with the supra's, community/producer communications eventually overcame that hurdle,now you're not $#@! in the supra community unless your over 1kwhp(and those are cave-man computers in relation to DME's). There aren't parts available atm to step past that 650hp reliably,back to back...there's some major conflicts to be addressed...they can be.It's highly unlikely that one shop is going to independently crack this little glass ceiling i see...
        +rep
        I agree 100%. Cobb and PROEFI are the only companies actually advancing the tuning aspect.
      1. CaptainInsano's Avatar
        CaptainInsano -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        Have the diff lockdown in place or at least solid diff bushings? Be careful with wheelhop and good luck!
        I have solid bushings. Let's see how bad the hop is before getting the diff lockdown.
      1. rick@defiv's Avatar
        rick@defiv -
        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        +rep
        I agree 100%. Cobb and PROEFI are the only companies actually advancing the tuning aspect.
        dzenno's torque figures back that pretty hard. I'm dying to see what's up with the PROEFI. At the end of the day, this is a tough nut to crack...It will happen eventually, but I hold no bets on when or who...they'll certainly earn all of my respect if it's repeatable/reliable. It's a shame Bosch Motorsport is so astronomically expensive, they have GDI ecu's out the wazoo, can build entire high flow DI setups,start to finish,incredible ignition options,etc,etc...Just way more coin than I'm willing to risk in event of car interface(datastream) issues....It's never going to be affordable in relation to the platform, or at least anytime soon. Wait and see I suppose
      1. Anthony@FFTEC's Avatar
        Anthony@FFTEC -
        GeorgiaTech335Coupe ---- "It would be nice if we could keep this discussion purely technical and respectful for the sake of problem solving. But for some odd reason I think I may be asking too much on the internet."

        Ill try my best -

        TerryOFBMS ---- "Yeah it doesn't really add up to me either. I'd worry more about bearing issues, etc, if there are really harmonics flying down the crankshaft. But I have not personally done testing on this so who knows. A good solid flywheel is always a good move anyway."

        rickOFdefiv ---- "So, the only way that this theory adds up on a technical level is that the DMFW is sending adverse reactions all the way through the crank thus disrupting timing chain deflection, creating cam/crank angle reference errors. Boy. theoretically that's like watching a Rube Goldberg machine go through it's paces. I'd be more inclined to buy it IF the reluctor ring was on the FW instead of the crank. 'm not discounting the incredibly slim chance that this is possible, but under full load against 6,000 rpm of rotational load?! Ha. This is great. One would assume the DMFW would be exiting the bellhousing in a relatively violent manner at that sort of disruption level. I'd love to see some oscilloscope screen shots of this going down"

        The crank angle sensor is located at the REAR of the engine. The heavy DMFW is causing the crank to fluctuate, which is being percieved by the sensor (located at the rear of the crank, next to the FW) as misfire.

        Nothing is shooting down the crank, to the timing chain etc.

        Please, do attempt to spin a very heavy flywheel at 6000+ RPM, and tell me that you had no trouble holding it perfectly centered. Actually, spin it rapidly and let me know if your results are even better.

        Spinning it up VERY fast with a lot of Torque is GOING to cause the crank to fluctuate, AND be picked up by the sensor.
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by trbolexis Click here to enlarge
        Why am i unable to POST!
        probably best you don't.
      1. Anthony@FFTEC's Avatar
        Anthony@FFTEC -
        Click here to enlarge Originally Posted by Ak335i Click here to enlarge
        probably best you don't.
        Cool.

        Please read my above post.
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by trbolexis Click here to enlarge
        Cool.

        Please read my above post.

        wow
        im impressed, not the same trbolexus I remember
        kudos
      1. Flinchy's Avatar
        Flinchy -
        Click here to enlarge Originally Posted by jpsimon Click here to enlarge
        former boosted posted up his independent dyno a long time ago (262 rwhp stock)


        http://www.bimmerboost.com/images/im...9/Dyno21-1.jpg

        http://www.youtube.com/watch?feature...=pdTwtr5RQgk#!
        ah, cool, not bad! .. i say a slightly disappointing power figure, but still not bad!

        any vids of it driving? on the road? how it's runnign today?

        any OTHER cars?
      1. Flinchy's Avatar
        Flinchy -
        Click here to enlarge Originally Posted by trbolexis Click here to enlarge
        Spinning it up VERY fast with a lot of Torque is GOING to cause the crank to fluctuate, AND be picked up by the sensor.
        only if something is out of balance somewhere

        which is never good, ever.. and should never happen >_>

        a heavier flywheel should be MORE stable though.

        the DMF whole deal is about ELIMINATING torque spikes/fluctuations by way of the dampening springs.. and having two masses... get a flywheel of the same balance in single mass and you'll see far worse.
      1. rader1's Avatar
        rader1 -
        Click here to enlarge Originally Posted by Flinchy Click here to enlarge
        only if something is out of balance somewhere

        which is never good, ever.. and should never happen >_>

        a heavier flywheel should be MORE stable though.

        the DMF whole deal is about ELIMINATING torque spikes/fluctuations by way of the dampening springs.. and having two masses... get a flywheel of the same balance in single mass and you'll see far worse.
        Well... yes and no. A DMFW is designed with a specific rev/power range in mind. The fact that the misfires are only occurring near the top of the stock rev band in cars over 500whp almost lends some credibility to this theory. Still though...
      1. Flinchy's Avatar
        Flinchy -
        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        Well... yes and no. A DMFW is designed with a specific rev/power range in mind. The fact that the misfires are only occurring near the top of the stock rev band in cars over 500whp almost lends some credibility to this theory. Still though...
        isn't it occuring at WOT where torque fluctuations that aren't caused by tuning issues are (should be) impossible?

        what kinda car would have weird torque spikes in that situation?


        we're talking about a DMF that's identical on all N54 powered cars.. regardless of how much power they're making, they have the same rotational forces at a given RPM.........
      1. rader1's Avatar
        rader1 -
        Click here to enlarge Originally Posted by Flinchy Click here to enlarge
        isn't it occuring at WOT where torque fluctuations that aren't caused by tuning issues are (should be) impossible?

        what kinda car would have weird torque spikes in that situation?


        we're talking about a DMF that's identical on all N54 powered cars.. regardless of how much power they're making, they have the same rotational forces at a given RPM.........
        I don't disagree with you. I'm not saying I am sold on their theory. If this was the cause I would actually expext to see this being more of an issue in the lower rev range of a torque monster(460wtq+) when someone hammers the throttle and the crank speed starts to ramp up but the drive line resists rather than mid pull.
      1. rader1's Avatar
        rader1 -
        The worst part of all this is that we'll never really know if this solves the problem. With Shiv publicly announcing this on nazipost I'm sure he's already decided that this will fix it(regardless of if it does or not) and will make it appear that it has. The nuthuggers will take it as gospel and scream "haterz" if the subject is ever brought up again... and the world turns.
      1. Flinchy's Avatar
        Flinchy -
        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        I don't disagree with you. I'm not saying I am sold on their theory. If this was the cause I would actually expext to see this being more of an issue in the lower rev range of a torque monster(460wtq+) when someone hammers the throttle and the crank speed starts to ramp up but the drive line resists rather than mid pull.
        yeah.. at peak torque, right? (or when peak torque HITS) since it's got an almost perfectly flat 'curve' going by the above graph.

        heck, compared to dzennos torque monster, these things are practically torque-free!.. can't stock turbo N54's just about reach these torque figures when you wring their necks?

        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        The worst part of all this is that we'll never really know if this solves the problem. With Shiv publicly announcing this on nazipost I'm sure he's already decided that this will fix it(regardless of if it does or not) and will make it appear that it has. The nuthuggers will take it as gospel and scream "haterz" if the subject is ever brought up again... and the world turns.
        Click here to enlarge Click here to enlarge Click here to enlarge Click here to enlarge

        this kills the N54 development/community.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by rader1 Click here to enlarge
        The worst part of all this is that we'll never really know if this solves the problem. With Shiv publicly announcing this on nazipost I'm sure he's already decided that this will fix it(regardless of if it does or not) and will make it appear that it has. The nuthuggers will take it as gospel and scream "haterz" if the subject is ever brought up again... and the world turns.
        Oh you guys will definitely know if this works. None of us were happy about this situation, I can assure you that. We are more worried about a solution than playing the blame game, but I have no problem playing it if I need to.

        If the new flywheel does not fix my misfire, I will be sure to post it. It wouldn't be cool to let other people think this would solve the problem (regardless of what kit they may be running in the future), if it didn't. I don't want anyone to have to deal with this like I have.
      1. Flinchy's Avatar
        Flinchy -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Oh you guys will definitely know if this works. None of us were happy about this situation, I can assure you that. We are more worried about a solution than playing the blame game, but I have no problem playing it if I need to.

        If the new flywheel does not fix my misfire, I will be sure to post it. It wouldn't be cool to let other people think this would solve the problem (regardless of what kit they may be running in the future), if it didn't. I don't want anyone to have to deal with this like I have.
        just make sure 100% that nothing else is done... not that you can on the tuning side of things

        hence we'll never 100% know for sure >_>
      1. BlackJetE90OC's Avatar
        BlackJetE90OC -
        LOL at this dumbass who thinks he is the only that knows of Joey Hand.