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. nafoo's Avatar
        nafoo -
        Click here to enlarge Originally Posted by Carl Morris Click here to enlarge
        One thing you are making me wonder, has anybody with the misfire problem ever duplicated the problem with a SMFW installed? I just ask because I notice that on hard shifts I seem to get several samples of rpm oscillation on the Cobb logger before it settles out again. I assume it due to the DMFW oscillating. In my low-power case that seems to cause more sensitive knock readings but I don't have the misfire issue. But since I have seen it affect the ECU, I'm just wondering if anybody with a SMFW has ever had your misfire issue? The DMFW will allow a lot more instantaneous change in rpm.
        12/10/12 at 2:22 PM

        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        Shiv is running a single mass, FBIS is running a single mass flywheel. AFAIK they don't misfire. My issues have all been with the DMFW in place as my single mass flywheel from CM went before putting on RB turbos as far as I remember. I'll have to double check though.

        However, if that were indeed the case, why ONLY and ALWAYS bank2! Click here to enlarge

        EDIT: Another funny thing since we're on it, both Shiv and FBIS run a 3.46 rear end!
        12/10/12 at 2:27 PM

        Click here to enlarge Originally Posted by tmo335tt Click here to enlarge
        I have the stock dual mass with a spec clutch..and it misfires so I wouldn't rule it out yet.
        12/10/12 at 2:33 PM

        Seems like this is where tmo found his bright idea and pitched it to Shiv.
      1. nafoo's Avatar
        nafoo -
        Click here to enlarge Originally Posted by rudypoochris Click here to enlarge
        My point exactly. Enlighten me as to why Shiv is taking ANY credit for this. If anything he is the one who should of not only known about it but also developed a solution. Its okay, this is the first issue... oh wait, never mind ATs apparently can't perform at Shift Sector... Oh wait... neither can MTs. AHHHH DERP.
        Oh, your post, at first read, seemed like you were defending Shiv, lolol.

        Choose your words wisely my friend Click here to enlarge
      1. rudypoochris's Avatar
        rudypoochris -
        Well to Shivs credit, at least he solved the post shift misfires that have been plaguing all ATs for the past 2 years. OH WAIT. Terry did that and didn't try and claim credit for someone elses work.
      1. themyst's Avatar
        themyst -
        Click here to enlarge Originally Posted by rudypoochris Click here to enlarge
        Well to Shivs credit, at least he solved the post shift misfires that have been plaguing all ATs for the past 2 years. OH WAIT. Terry did that and didn't try and claim credit for someone elses work.
        You mean the post-shift flatline. To Shiv's credit, he did fix the 6AT misfires (while costing me $150.00 for that stupid VIN lock).
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by themyst Click here to enlarge
        You mean the post-shift flatline. To Shiv's credit, he did fix the 6AT misfires (while costing me $150.00 for that stupid VIN lock).
        You can't take credit for fixing something you caused in the first place. Click here to enlarge
      1. themyst's Avatar
        themyst -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        You can't take credit for fixing something you caused in the first place. Click here to enlarge
        lol, truth!
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Not sure if tmo335tt got the idea here or just on his own pondering, but he didn't consult with Shiv. He told Shiv a few days after he, I, and the other guy discussed it for a while. tmo335tt also used an expensive oscilloscope that he borrowed from his buddy's Porsche shop and saw the spike on the CPS when he put his car on the dyno and induced the misfire.

        tmo335tt definitely deserves the credit for all the info up to this point and if it does work. If it doesn't, then back to the drawing board for all of us. Let's hope it doesn't come down to that though, because we all suffer, especially us guys who have dropped over 10k.
      1. amclint's Avatar
        amclint -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        It would come up some runs and not others for me. Still have not really had a chance to look in to it. I don't spend a lot of time in 5th gear @ 150mph accelerating. Click here to enlarge
        It would be glorious if we could legally do this in the USA every day on the way to work, early AM with the V1 I have fun deep into 4th sometimes but it's never for more than a few miles. I need to do a euro delivery and take a delimiter with me Click here to enlarge
      1. themyst's Avatar
        themyst -
        I wonder if there is a way to reset adaptations for the crank position sensor. Still believe the procede with its extensive CPS implementation is causing these issues.

        If this is truly a 6MT specific issue we can throw hotrods issues out the Window.
      1. Autobahn335i's Avatar
        Autobahn335i -
        Click here to enlarge Originally Posted by stangorang Click here to enlarge
        The BMW Bentley manual states that when doing an ATF change one should monitor the trans fluid temp using the OBD port, in order to fill the tranny to the appropriate fluid level.

        I am surprised nobody has tapped into this feature (assuming it exists) to monitor tranny temps during these high speed runs. Seems like the Cobb AP could take advantage of this Click here to enlarge
        I don't think heat is the root of the problem. When raced on a roadtrack for an extended time, the 6AT fluid will surely heat up more than on a single 2-5th gear pull. I've heard reports from folks getting a proper tranny malfunction message/limp mode when the transmission overheats. Different problem.

        If we could get ahold of the Alpina code the issue would probably be solved. Alpina uses the same gearbox on the B3 GT3 (408bhp, 540 NM). Yet they make the transmission shift a bit faster and withstand the added torque. Admittedly we're talking about different power levels than what we see with RBs and STs, but it would be a good start for the 6AT cars.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Not sure if tmo335tt got the idea here or just on his own pondering, but he didn't consult with Shiv. He told Shiv a few days after he, I, and the other guy discussed it for a while. tmo335tt also used an expensive oscilloscope that he borrowed from his buddy's Porsche shop and saw the spike on the CPS when he put his car on the dyno and induced the misfire.

        tmo335tt definitely deserves the credit for all the info up to this point and if it does work. If it doesn't, then back to the drawing board for all of us. Let's hope it doesn't come down to that though, because we all suffer, especially us guys who have dropped over 10k.
        how so?
        Click here to enlarge Originally Posted by nafoo Click here to enlarge
        12/10/12 at 2:22 PM



        12/10/12 at 2:27 PM



        12/10/12 at 2:33 PM

        Seems like this is where tmo found his bright idea and pitched it to Shiv.
        givent that timeline, he didnt discover anything. given the reports tmo said here, he didnt discover anything, it was carl. MAYBE he looked into it to confirm, but he doesnt get credit for raising the information to public light. IF ANYTHING, YOU get the most credit for FORCING the research aggressively for posting here. as everyone else see's it tmo didnt do anything except make himself look a fool..
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by themyst Click here to enlarge
        sell me your S65
        ok, call me, its with rick@defiv right now for fitment testing, but its for sale, you know this Click here to enlarge
      1. NJrep335i's Avatar
        NJrep335i -
        For what it's worth, I did some research and found a bunch of Porsche owners having similar problems. They did all of the usual maintenance I.E Plugs, Coils, injectors... and still had the issue until moving to a SMFW. So It is plausible, hope it does fix the problems so we can see some nice times and N54 advancment.

        I also read that the clunking noise when you shut off the car is from a worn down DMFW. I know I've been hearing it a bit more then I can rememeber and I'm only in the low 400's range.
      1. Sticky's Avatar
        Sticky -
        Why does BMW choose dual mass over single in the first place?
      1. NJrep335i's Avatar
        NJrep335i -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Why does BMW choose dual mass over single in the first place?
        It seems the only "Pro" to a DMFW is the vibration dampening between the Crankshaft and the Transmission. It lessens the chance of gear chatter and torsional shock on the drivetrain. This is more evident on Diesel Motors which provide more torque shock.

        I can't say myself if I've ever heard real gear chatter from a SMFW. I know my 6 puck clutch was quite noisy but I expected that. BMW trying to provide the "ultimate driving experience" is a mix between sporty and comfort..
      1. Autobahn335i's Avatar
        Autobahn335i -
        Click here to enlarge Originally Posted by NJrep335i Click here to enlarge
        For what it's worth, I did some research and found a bunch of Porsche owners having similar problems. They did all of the usual maintenance I.E Plugs, Coils, injectors... and still had the issue until moving to a SMFW. So It is plausible, hope it does fix the problems so we can see some nice times and N54 advancment.
        Which Porsche models have similar issues?
      1. NJrep335i's Avatar
        NJrep335i -
        Click here to enlarge Originally Posted by Autobahn335i Click here to enlarge
        Which Porsche models have similar issues?
        Here is a link to a 993.
        http://forums.rennlist.com/rennforum...ire-codes.html
      1. Autobahn335i's Avatar
        Autobahn335i -
        Click here to enlarge Originally Posted by NJrep335i Click here to enlarge
        Thanks! Very interesting.
      1. JStang's Avatar
        JStang -
        Click here to enlarge Originally Posted by NJrep335i Click here to enlarge
        I don't think you are comparing apples to apples here. The Porsche forum is just stating that the car is misfiring due to a bad DMF. These guys do not have bad flywheels but their speculation is that it is twisting because of the power levels. There are a couple of guys with 20K miles on their cars and they are getting the same misfires with known good flywheels.
      1. NJrep335i's Avatar
        NJrep335i -
        Click here to enlarge Originally Posted by JStang Click here to enlarge
        I don't think you are comparing apples to apples here. The Porsche forum is just stating that the car is misfiring due to a bad DMF. These guys do not have bad flywheels but their speculation is that it is twisting because of the power levels. There are a couple of guys with 20K miles on their cars and they are getting the same misfires with known good flywheels.
        I'm not in anyway saying this is definitely the fix. What I am saying is that the Porsche community has replaced some of there DMFW's in lieu of random misfires, So it could be plausible.

        Also the amount of miles does not also always have a direct effect on failures. Premature failures are possible when the actual doesn't meet the designed specifications. I.E Applying more torque then the unit was designed for.