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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. CaptainInsano's Avatar
        CaptainInsano -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        All plugs were changed less than 1000 miles ago. Injector on 3 was changed in September. So I'm thinking/hoping coil. The bank 1 crap seems to be unrelated tho. Not really sure what that is. I just replaced an O2 but can't remember which one off the top of my head. No O2 codes tho.
        Damn you are having a lot of problems. I had misfires on 2 cylinders due to coils just before the single turbo conversion, and the 02 sensors went out at laguna seca a couple months later. My bet is on the O2 sensor since you only changed one, but the coils are an easy test.

        Thanks for keeping everyone updated.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Q4P Click here to enlarge
        LOL... both those cars have every single dash warning light on.

        BLASPHEME!!!
      1. lulz_m3's Avatar
        lulz_m3 -
        Have to admit, the ST sounds damn sexy.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        I just realized that I just put a new O2 sensosr in bank 1 at the beginning of the month. What are the odds it could have gone bad already?
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by lulz_m3 Click here to enlarge
        Have to admit, the ST sounds damn sexy.
        It sounds bad ass. Turbo spool makes you want to go WOT all the time.
      1. bigdnno98's Avatar
        bigdnno98 -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        I just realized that I just put a new O2 sensosr in bank 1 at the beginning of the month. What are the odds it could have gone bad already?
        Very unlikely.
      1. CaptainInsano's Avatar
        CaptainInsano -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        I just realized that I just put a new O2 sensosr in bank 1 at the beginning of the month. What are the odds it could have gone bad already?
        Slim to none. Check your coils, especially if you haven't' change them before. Took me about 20 min to replace them all.
      1. Terry@BMS's Avatar
        Terry@BMS -
        At higher boost levels your o2 sensors might be a little more sensitive to going out since you have them mounted preturbo. They are rated for 900c give or take. Since they are right on top of the engine and easy to reach maybe just switch them to see if problems move to bank 2. Apparently there is a generic Bosch sensor that is a direct fit and 1/2 the price of the OEM one if you are not already using those.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        New injector on cylinder 3 cleared up the issue. No more misfire and AFR and STFT look as they should.

        It's crazy that this injector went bad already. I had just replaced cylinder 3's injector at the end of September. Less than 3 months of service is terrible, especially for how expensive they are.
      1. whoosh's Avatar
        whoosh -
        Better get in on that 90 day parts warranty then. Click here to enlarge

        What's your next opportunity at the track now that your car is in good health?
      1. Legionofboom's Avatar
        Legionofboom -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        New injector on cylinder 3 cleared up the issue. No more misfire and AFR and STFT look as they should.

        It's crazy that this injector went bad already. I had just replaced cylinder 3's injector at the end of September. Less than 3 months of service is terrible, especially for how expensive they are.
        Ugh! We need an upgrade coil option that isn't $1000+
      1. bigdnno98's Avatar
        bigdnno98 -
        Why doesn't someone experiment with coils from other models like other platforms do? are the coils on the S65 and the N63/S63 similar to the N54? one could just try to install one and see what happens. you wouldn't be out a bunch of money and who knows it could be a relatively cheap upgrade.

        Click here to enlarge Originally Posted by E90SoFlo Click here to enlarge
        Ugh! We need an upgrade coil option that isn't $1000+
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        He said injector on cylinder 3, not coil.

        Having said that I have to say that my Okada coils along with the NGK 5992 plugs gapped seem to be very reliable. I haven't had to change either coils or plugs in a while now other than me pulling plugs to inspect them here and there. I have a feeling having a shorter gap on the plugs is making it easier on the ignition system overall and also making the system less prone to failure due to less ignition load. Maybe having NGK 5992 plugs gapped to 0.022" even with the stock coils would prove a nice "upgrade" to the ignition system in the sense that it'd reduce coil failure rates. Just a thought..
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        If someone could find a sure-fire way to recondition an injector, they'd probably make a lot of money...at least from me lol.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by whoosh Click here to enlarge
        Better get in on that 90 day parts warranty then. Click here to enlarge

        What's your next opportunity at the track now that your car is in good health?
        My local track is "closed for good", but I'm pretty sure they are reopening in March. There is an event down at PBIR on the 27th, I may do that but it's a drive for me.

        Maybe some 60-130 runs to hold me over?
      1. bobS's Avatar
        bobS -
        Yes, get some 60-130 runs ASAP! I want to see what these single cars can really do.
      1. 654's Avatar
        654 -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Maybe some 60-130 runs to hold me over?
        +1
      1. whoosh's Avatar
        whoosh -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        Maybe some 60-130 runs to hold me over?
        obviously, since Mexico is closer to your house than PBIR. Click here to enlarge
      1. Terry@BMS's Avatar
        Terry@BMS -
        60-130 is a great way to enjoy the car as your new power curve is very well suited for it being a manual. Click here to enlarge Full weight with race gas, max boost, etc, I think a good target for you is 6.9s on a 1.5% or lower grade.
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        60-130 is a great way to enjoy the car as your new power curve is very well suited for it being a manual. Click here to enlarge Full weight with race gas, max boost, etc, I think a good target for you is 6.9s on a 1.5% or lower grade.
        If he goes with 26" tires in the rear, that I think he had mentioned before, and uses a 3.46 it'd be even better. 3.08 doesn't provide the same acceleration as a 3.46 diff and this puts the advantage to the 6AT cars when it comes to pure acceleration/speed type tests such as the 60-130 times..the only thing hurting a 3.46 is if you run a smaller diameter tire that'll require a shift into 5th

        If I wasn't going to hit the strip ever again and focus in on 60-130 entirely my car would have a 3.46 in it long time ago