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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. Legionofboom's Avatar
        Legionofboom -
        Click here to enlarge Originally Posted by Laloosh Click here to enlarge
        Put it this way, I have never officially drag raced anything BUT a manual transmission car, and the bmw manual tranmission flat out sucks. I was still able to crack low 12s and over 120 traps on stop turbos, however the shifting never felt right when pushed to its max. Over the course of 3 years I got some what use to it, untill I got my mustang and realized that I can slam the $#@! out of the shifter and chirp the 3-4 shift at over 100 mph in a bone stock car. I believe one of my first posts when my bmw was bone stock was how to fully turn off traction control (even though it was) becuase I was bogging a bone stock car from shifting to fast.

        As for launching a mt, theres alot more to getting a mt car downt he track then just launching, more then half the time I blow the tires on a good hard 1-2 shift instead of the initial hit....
        haha laloosh got a mustang.

        You will fit in good with mustang owners Click here to enlarge
      1. Torgus's Avatar
        Torgus -
        Click here to enlarge Originally Posted by Laloosh Click here to enlarge
        I was bogging a bone stock car from shifting to fast.
        Can you explain how this happens?
      1. Laloosh's Avatar
        Laloosh -
        Click here to enlarge Originally Posted by Torgus Click here to enlarge
        Can you explain how this happens?
        The cars programming cuts throttle when boost is higher then expected during shifts or when load clips are exceeded.
      1. dan avoN7's Avatar
        dan avoN7 -
        Launching with stock twins is extremely easy when compared to a larger single turbo. There are TONS of variables to consider though.. Powerband, suspension, tires, transmission, launch control, track prep, etc.. The stock twins will pull nice 60 ft's without requiring anything special. For a larger single turbo you need a lot more work to properly get the car off the line. Once setup properly and on a well prepped track, the setup will start to shine and pull better 60ft's than the twins. If not done just right though the car will bog big time and you will be looking at poorer results.
      1. shiv@vishnu's Avatar
        shiv@vishnu -
        Click here to enlarge Originally Posted by TerryBMS Click here to enlarge
        The MTs are in a good position to dominate MPH and 60-130 times, but in terms of ET, so far have not been impressive. For example at the same track with similar quality drivers Shiv's customers AT car went 11.3 OEM turbos with 440whp. Shiv went 10.8 single turbo with 200whp+, more suspension, etc. Only a half second difference.
        That's also with an extra shift. Which is worth at least 0.3-0.4s in itself. 6mt cars don't have be luxury of launching in 2nd gear. So you can take your half second and bump it up to 0.8-0.9. If that is minor, then we are not on the same page Click here to enlarge
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by shiv@vishnu Click here to enlarge
        That's also with an extra shift. Which is worth at least 0.3-0.4s in itself. 6mt cars don't have be luxury of launching in 2nd gear. So you can take your half second and bump it up to 0.8-0.9. If that is minor, then we are not on the same page Click here to enlarge
        lol, 2nd gear launches are good for what, 1.7's? that is a standard "decent" 60'. If i had done a 1st gear and sub 30psi tire that day, youd still be chasing my times. please dont offer excuses. for $#@!s sake, just bring the car out here to jersey for the ER roll on and a private atco rental that you and i can set up for the same weekend. ill be polite, im just tired of your excuses..
      1. Carl Morris's Avatar
        Carl Morris -
        MTs on street tires really benefit from AWD and 2-step/WOTbox. I haven't seen people getting serious with that combo yet.
      1. BEAR-AvHistory's Avatar
        BEAR-AvHistory -
        Click here to enlarge Originally Posted by shiv@vishnu Click here to enlarge
        That's also with an extra shift. Which is worth at least 0.3-0.4s in itself. 6mt cars don't have be luxury of launching in 2nd gear. So you can take your half second and bump it up to 0.8-0.9. If that is minor, then we are not on the same page Click here to enlarge
        It must really suck to only have an extra 200whp to cover a shift. What's next - the dog ate your clutch pedal stop?
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by shiv@vishnu Click here to enlarge
        That's also with an extra shift. Which is worth at least 0.3-0.4s in itself. 6mt cars don't have be luxury of launching in 2nd gear. So you can take your half second and bump it up to 0.8-0.9. If that is minor, then we are not on the same page Click here to enlarge
        lol why would you loose .4s doing a shift? The car doesn't stop moving when you go to shift.
      1. Kollegga's Avatar
        Kollegga -
        findings:

        shiv@vishnu
        doesnt know much about the"laws of physics"


        but he seems to be quite good in math (only counting so far)

        sit down pls ^^
      1. rudypoochris's Avatar
        rudypoochris -
        Click here to enlarge Originally Posted by shiv@vishnu Click here to enlarge
        That's also with an extra shift. Which is worth at least 0.3-0.4s in itself. 6mt cars don't have be luxury of launching in 2nd gear. So you can take your half second and bump it up to 0.8-0.9. If that is minor, then we are not on the same page Click here to enlarge
        Maybe you were granny shifting, not double clutching like you should? Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by rudypoochris Click here to enlarge
        Maybe you were granny shifting, not double clutching like you should? Click here to enlarge
        Also might need two of the big bottles.
      1. LostMarine's Avatar
        LostMarine -
        He didnt have enough cow bell..
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        lol why would you loose .4s doing a shift? The car doesn't stop moving when you go to shift.
        You don't lose .4s but you are at a 0.3sec disadvantage compared to a 6AT car that doesn't unload through shifts
      1. BEAR-AvHistory's Avatar
        BEAR-AvHistory -
        Its possible he really just sucks at shifting quickly. Maybe what he is really saying is if he was not losing so much time shifting, if he loses it on one shift all the shifts must be slow, he really has a 9 second car with a good driver.
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        I'd gladly let an AT owner take my car down the strip once this weekend in Orlando to see how much fun it is trying to launch this car.
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by GeorgiaTech335Coupe Click here to enlarge
        I'd gladly let an AT owner take my car down the strip once this weekend in Orlando to see how much fun it is trying to launch this car.
        My advice, if you dont get the ET you want (which i doubt you'll get due to lack of experience and 6MT) on the first two runs just roll easy off the line and go for that trap!

        OR, just go for the trap speed from the get-go Click here to enlarge
      1. GeorgiaTech335Coupe's Avatar
        GeorgiaTech335Coupe -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        My advice, if you dont get the ET you want (which i doubt you'll get due to lack of experience and 6MT) on the first two runs just roll easy off the line and go for that trap!

        OR, just go for the trap speed from the get-go Click here to enlarge
        100% what I'm doing. First few runs I won't launch too hard (but have to try or car bogs down badly). I want to see what trap I get mostly. Then after a few of those runs, I'll go for gold. My main concern is when I'm going to snap those half shafts, want to have a little fun first.

        I'm hoping this new clutch allows me to use 2step and NLS. The ACT clutch would not let me use it effectively due to the super low engagement point.
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        You don't lose .4s but you are at a 0.3sec disadvantage compared to a 6AT car that doesn't unload through shifts
        With NLS you hold boost so there isn't much re-spool time. You might loose .3ths of acceleration time but that is fairly negligible IMHO. Maybe .1th? I could go work it out on paper but under the weather and can barely keep my head up at the moment. Click here to enlarge
      1. BEAR-AvHistory's Avatar
        BEAR-AvHistory -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        You don't lose .4s but you are at a 0.3sec disadvantage compared to a 6AT car that doesn't unload through shifts
        I wonder if that's over the whole quarter mile not per shift. IIRC BMW lists the 6MT 2/10 quicker to 60 than the standard auto & 1/10 slower than the DCT go figure.