• 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 -
        Great to hear there is a solution to this as I was feeling terrible for the guys that paid all this money for ST and the car not to function As advertised. Now I want to see some 1/4 passes!
      1. redlineryder's Avatar
        redlineryder -
        This place is so awesome because everyone is so humble Click here to enlarge

        Anyways, good to see progress being made.
      1. BuraQ's Avatar
        BuraQ -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Yes I hope so. I needed a new clutch anyway since the ACT is dragging, so it works out nicely.
        When this fix is applied and working please let me know when your going to be at PBIR so I can take vids on the side

        Thanks
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        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.
        My read is the author is saying the DMFW can itself cause rotational speed variations in the crankshaft which can then be interpreted as "rough running". I don't know a lot about DMFW mechanics. When the clutch is disengaged pressure from the pressure plate and friction holds both flywheels together? How would the flywheel slipping be any different than the clutch or wheels spinning from the perspective of the crank position sensor?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by tmo335tt Click here to enlarge
        I'm not looking for anything in return...
        Vishnu would be, interesting.
      1. nafoo's Avatar
        nafoo -
        Click here to enlarge Originally Posted by tmo335tt Click here to enlarge
        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.
        Just curious, do you have a single mass flywheel in your ST car now? How do you know this is the cause for sure, if you haven't tested the theory?

        Sorry if I missed this answer in the numerous pages before.
      1. rick@defiv's Avatar
        rick@defiv -
        HOW DARE YOU MENTION METH!? NOTHING BAD CAN COME FROM IT!! YOU WILL BE CHASTISED BY THE MAN THAT HAD WEEKS WORTH OF MISFIRES AND THEN FOUND THE FIX AS SOON AS AN ISSUE WAS MADE PUBLIC IF YOU SAY THAT AGAIN!!
        LMFAO..It has it's places.. BUT it takes balls of steel to use charge air meth injection with an oem intake and push past the even 80% of the DI system's max duty cycle....or reckless abandon....cant wait for the melted piston pics lol. And really, the dual mass flywheel causing misfires? Isn't the reluctor ring on the crankshaft...yup....hmmm. that's hilarious.this is such good reading...next it's gonna be timing chain deflection under load...not disagreeing that the dual mass fw's belong one place.the local trash heap...
      1. LostMarine's Avatar
        LostMarine -
        tough crowd i guess. shame on us for collectively questioning the all mighty shiv and his followers. years of procede misfiring has finally been solved here. years of phantom misfires have been solved, in 48 hours due to one man.. and yet, nothing has even been tested, but have no fear, the almighty and disciples guarantee its a fix, and we shall FINALLY see 9 and 10 second ST 335's, with 60-130 times and race videos.. and completely forget nothing has been wrong since they were released anyway.. no blown transmission for AT or misfires for MT..

        wait.. didnt someone call the AT hold back months ago from inside sources..? nah.. couldnt be..

        @tmot335ttyzfxtc

        you have a fix already, or you have a theory? I, and apparently a few others are confused..
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Man some people just never change. Shiv already made a big announcement on e90 that the fix is in the single mass flywheel because 3 cars that don't misfire have single mass flywheels and the other 3 that do misfire are running DMFWs. While I do sincerely hope this issue is behind us once and for all it just goes to show again how premature his decisions and conclusions are without any real world testing of the "fix" with the single mass flywheels in place.

        Shiv, it better work out at this point as that "yuck" way of dealing with this (turning misfire detection) may actually be back as a workaround again Click here to enlarge i mean, really yuck considering its just a checkbox to turn off an emissions control algorithm and its free

        Glad you at least took the time finally to thank @tmo335tt for troubleshooting this for so long
      1. uniter's Avatar
        uniter -
        Did you change your spark plugs?
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        Man some people just never change. Shiv already made a big announcement on e90 that the fix is in the single mass flywheel because 3 cars that don't misfire have single mass flywheels and the other 3 that do misfire are running DMFWs. While I do sincerely hope this issue is behind us once and for all it just goes to show again how premature his decisions and conclusions are without any real world testing of the "fix" with the single mass flywheels in place.

        Shiv, it better work out at this point as that "yuck" way of dealing with this (turning misfire detection) may actually be back as a workaround again Click here to enlarge i mean, really yuck considering its just a checkbox to turn off an emissions control algorithm and its free

        Glad you at least took the time finally to thank @tmo335tt for troubleshooting this for so long
        i think thats what will happen, regardless. the "fix" will ultimatley be shutting it off. do we expect any less? I wish we had real unbiased feedback
      1. nafoo's Avatar
        nafoo -
        Shiv's post says @ttmo335tt is local. Maybe they just threw in a SMFW into his car to test it?

        More details would be nice Click here to enlarge
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by uniter Click here to enlarge
        Did you change your spark plugs?
        <3
      1. nafoo's Avatar
        nafoo -
        Click here to enlarge Originally Posted by nafoo Click here to enlarge
        Shiv's post says @ttmo335tt is local. Maybe they just threw in a SMFW into his car to test it?

        More details would be nice Click here to enlarge
        Nevermind:

        Click here to enlarge Originally Posted by shiv@vishnu Click here to enlarge
        At this point, I think we have enough data to reliability come to this conclusion. We have 7 single turbo 6MTs with single mass flywheels with no such problem. And 3 single turbo 6MTs with stock dual-mass flywheels with this problem.


        Unless I'm mistaken I think even Dzenno, who eventually resorted and routinely recommends disabling misfire detection, also has a stock dual mass flywheel (but now with a fully built head). The latter didn't fix his misfire issue. Because the issue wasn't engine-related.


        Shiv
        All speculation right now. Le sigh.
      1. Sticky's Avatar
        Sticky -
        If this issue was happening for three weeks, why is it a day after BimmerBoost puts an article out on it Shiv decides to comment on the issues and the "fix" as well? It puts a smile on my face.
      1. bobS's Avatar
        bobS -
        Can't wait to see some performance numbers on these single turbo cars! Since they've all had so much time to drive/enjoy them.
      1. Q4P's Avatar
        Q4P -
        Can I just get my procede flashed at home so that I can run a higher level of e85 lol? It's not asking much...
      1. Ak335i's Avatar
        Ak335i -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        If this issue was happening for three weeks, why is it a day after BimmerBoost puts an article out on it Shiv decides to comment on the issues and the "fix" as well? It puts a smile on my face.
        Youre welcome Click here to enlarge

        I wasnt aiming for all this added BS when i posted that he ran, but i sincerely hoped that if it was brought to light, the pressure would help drive the solution.
      1. rick@defiv's Avatar
        rick@defiv -
        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...I'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.....
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by rick@defiv Click here to enlarge
        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...I'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.....
        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. Click here to enlarge