• N55 tuning goes to the next level - Vargas N55 turbo upgrade with BMS JB4 tuning dyno results - 468 wheel horsepower

      Finally the N55 motor is getting some love! Up to this point the twin turbo N54 engine has dominated modern BMW turbo tuning and the N55 has been left in its shadow. BimmerBoost is proud to report that vendors BMS and Vargas Turbo Tech were able to work in collaboration and show a successfully tuned and installed turbocharger upgrade for the BMW N55. This is still very early on and there is more to come but N55 owners finally have a realistic turbo upgrade option to look forward to.


      Notes from Terry@BMS:

      I think the data speaks for itself but here are a few notes:

      1) Boost with the fix is overall what I expected it would be from the start. It's able to hit ~20psi in the midrange and hold ~18psi @ 6000rpm. There is probably another psi or so of midrange boost in there with a 3.5 bar MAP sensor if we want it. It makes a little less down low which is to be expected. The gains up top are now well worth anything lost. On the street it's spooling faster now and feels great.

      2) Tuning is done using JB4 ISO v5.2. We also reworked the back end flash for the E50 + meth fuel and found MBT around 9 degrees peak. The flash is loaded using a Cobb AP. Currently, they only support 2011-early 2012 models. Hopefully more models are added soon. The turbo can be used with the OEM flash but only with E85, or E85 + meth. We'll write pump gas maps for the turbo in the coming weeks for those who are using the back end flash and want to run 91 or 93.

      3) With a little more boost and some other tuning tweaks 500whp might be possible with this setup. For now I'm very happy to have 120whp over stock @ 6000rpm. At 468rw this car should have enough power to run mid 11s full weight. I hope to find out this weekend.

      4) This car finally lives up to it's "Dr N55" plates.







      This article was originally published in forum thread: Vargas N55 Turbo Upgrade Dyno - Take 2! started by Terry@BMS View original post
      Comments 143 Comments
      1. BavarianBullet's Avatar
        BavarianBullet -
        Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
        Tony why the taper up top? Turbine housing? I've seen a 3076r with a .63 hold 30psi to redline. Just wondering why this one won't. I assume it's due to the much smaller turbine housing.
        The manifold has some pretty serious bends in it too if you saw the sectioned one earlier. Not as nice as N54 turbos.

        Also maybe the stock inlet tube could be starting to slow things down a little at these power levels.

        Its also valvetronic. If cobb figures out those tables and makes them accessible, could be some goodness in there as well. Recall he n55 has slightly larger valves and cam adjustment range vs the n54 head. Time will tell!
      1. fastgti69's Avatar
        fastgti69 -
        Awesome news. Can't wait to see that turbo with 28lbs boost and e50 mix. 550whp all day.
      1. Dr. G's Avatar
        Dr. G -
        Nice to see it all worked out in the end. The difference up top is amazing, must feel great all the way up to redline.

        I look forward to seeing how things workout with some more boost.
      1. 335i-BB's Avatar
        335i-BB -
        Hi Tony.
        Isn't this thing faster than a Stage 2.2 N54 when it reaches 500whp/650ft-lb?

        Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
        Oh yeah! That thing is making power all the way to redline. Once you get the new map sensor on there, you should be able to do that with 500WHP+ as long as the fuel system can keep up, that is a bad ass wheel combo it should keep pulling, its not a fluke we picked it, when you see a GT3582 rated at much lower power levels then a smaller wheel combo, you know the smaller set is working together nicely. Good dyno info right there.

        Did we just create a stock frame N54 killer...Click here to enlargeClick here to enlarge
      1. Terry@BMS's Avatar
        Terry@BMS -
        You can view the page at http://www.germanboost.com/content.p...e-Dyno-Take-2!
      1. Sticky's Avatar
        Sticky -
        Promoted this to the front page with some minor edits. Terry, look at how beautiful your attachments look inserted inline and centered Click here to enlarge

        Intro paragraph added.

        Well done everyone. Looking forward to the crossing of the 500 whp barrier.
      1. BMDUB1's Avatar
        BMDUB1 -
        It can only go up from here....Great job Terry And Tony!
      1. ChuckD05's Avatar
        ChuckD05 -
        Props to Tony and Terry for seeing this through... This on a DCT 135i would be pretty damn awesome... esp when boost is raised even more
      1. Sticky's Avatar
        Sticky -
        I'm liking this for an X3.
      1. Andrew@activeautowerke's Avatar
        Andrew@activeautowerke -
        Waiting for the word so I can throw one in my 435Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Andrew@activeautowerke Click here to enlarge
        Waiting for the word so I can throw one in my 435Click here to enlarge
        Looks like everyone is getting in on this.

        The N55 section I guess will become the second most popular forum here in the coming year.
      1. BMDUB1's Avatar
        BMDUB1 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Looks like everyone is getting in on this.

        The N55 section I guess will become the second most popular forum here in the coming year.
        So Sticky, Does this mean I will need the Cobb Tune AP V3 also to go with my updated N55 Jb4 ( ISO is needed also? ) to run this turbo?
      1. curare's Avatar
        curare -
        Click here to enlarge Originally Posted by BMDUB1 Click here to enlarge
        So Sticky, Does this mean I will need the Cobb Tune AP V3 also to go with my updated N55 Jb4 ( ISO is needed also? ) to run this turbo?
        Its certainly recommended and really a necessity as you push higher boost targets. V2 will work just as well though
      1. BMDUB1's Avatar
        BMDUB1 -
        Click here to enlarge Originally Posted by curare Click here to enlarge
        Its certainly recommended and really a necessity as you push higher boost targets. V2 will work just as well though
        Awesome, Just wanted clarity on that..
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by BMDUB1 Click here to enlarge
        So Sticky, Does this mean I will need the Cobb Tune AP V3 also to go with my updated N55 Jb4 ( ISO is needed also? ) to run this turbo?
        You have to ask Terry.
      1. 135idct's Avatar
        135idct -
        the test car MT or DCT, i don't think the dct can handle +500 wtq
      1. leveraged sellout's Avatar
        leveraged sellout -
        Wow this is great news. I'm really excited to see the N55 finally get some real power. This is awesome. Cannot wait to see this continue to develop.
      1. benzy89's Avatar
        benzy89 -
        Haven't seen STFTs or LTFTs.... Was just wondering where they stand, especially since you're running an ethanol blend
      1. VargasTurboTech's Avatar
        VargasTurboTech -
        Click here to enlarge Originally Posted by benzy89 Click here to enlarge
        Haven't seen STFTs or LTFTs.... Was just wondering where they stand, especially since you're running an ethanol blend
        They are running meth so it would be hard to tell exactly what the fuel system is doing unless they did some runs without it. I cant imagine it would be any different from the N54 at those power levels
      1. Sticky's Avatar
        Sticky -
        I have to say I'm pleasantly surprised how popular the N55 stuff is getting.

        I don't know if this platform will ever rival the N54 for tuning popularity but this motor sticks around longer it just may.