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    • 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 145 Comments
      1. iuhutch's Avatar
        iuhutch -
        Thank you for the detailed insight. I bet you she makes 500+ with 22-23psi Click here to enlarge

        lets take this damn thing to the limit!!!! Click here to enlarge
      1. iuhutch's Avatar
        iuhutch -
        Click here to enlarge Originally Posted by VegasJD Click here to enlarge
        im hoping we can get it over 20 psi and hit over 500hp Click here to enlarge
        you installing yourself? If one is a wrench and tony posts a DIY, I'm pondering on the install difficulty. I've done everything myself on FBO but this....Click here to enlarge
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Click here to enlarge Originally Posted by iuhutch Click here to enlarge
        you installing yourself? If one is a wrench and tony posts a DIY, I'm pondering on the install difficulty. I've done everything myself on FBO but this....Click here to enlarge
        Its harder to install than an N54. Possibly cause it was my first one, but we are recommended these only be installed by shops. It's a time consuming, difficult job.
      1. VegasJD's Avatar
        VegasJD -
        Click here to enlarge Originally Posted by iuhutch Click here to enlarge
        you installing yourself? If one is a wrench and tony posts a DIY, I'm pondering on the install difficulty. I've done everything myself on FBO but this....Click here to enlarge
        no i have a shop that does all my install work all certified bmw techs southwest bimmers in vegas...they are eager to get this on they have done many turbo intall setups
      1. bigdnno98's Avatar
        bigdnno98 -
        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.
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        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.
        I honestly don't think its the housing, but we will see, we honestly do not know yet. Right now the JB is maxing out at 20 psi, so it cant ask for more than that, as the BP, EGT, shaft speed builds, I am assuming its going to have to ask for more than its actually going to see. I do not know much about the stack, but I was told the N55 Jb is maxed at 20, so if its asking for 20, its seeing 18. I am confident this thing will hold 20 psi to redline. We shall see
      1. bigdnno98's Avatar
        bigdnno98 -
        Tuning aside what do you thing the housing will support to redline? Is this the 20psi you're talking about? It'd be awesome to see 30psi peak with 25psi at 7000rpms.
      1. rader1's Avatar
        rader1 -
        Wow, freaking awesome numbers. Glad to see the N55 finally catching up!
      1. iuhutch's Avatar
        iuhutch -
        It really doesn't look all to complex to me. What does your kit consist of? Built housing and manifold. We are in the midst of getting a lift and engine hoist. With those, your DIY, time and Vargas consulting and two fairly skilled (non-mechanic but systems engineers) be capable of this task?


        Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
        Its harder to install than an N54. Possibly cause it was my first one, but we are recommended these only be installed by shops. It's a time consuming, difficult job.
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
        Tuning aside what do you thing the housing will support to redline? Is this the 20psi you're talking about? It'd be awesome to see 30psi peak with 25psi at 7000rpms.
        I don't see why you couldn't run 30 psi down low of you wanted to. The turbo would do it that's for sure. As far as 25 psi to 7K, that I am not sure about. The housing is a good size, but it is a housing built for spool over top end power. We have plenty of time to find out.
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Click here to enlarge Originally Posted by iuhutch Click here to enlarge
        It really doesn't look all to complex to me. What does your kit consist of? Built housing and manifold. We are in the midst of getting a lift and engine hoist. With those, your DIY, time and Vargas consulting and two fairly skilled (non-mechanic but systems engineers) be capable of this task?
        our kit is only slightly more difficult than a stock turbo to install, but bring a seasoned N54 turbo installer, the N55 to me was tougher, and there are plenty of things to go wrong.
      1. bigdnno98's Avatar
        bigdnno98 -
        Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
        I don't see why you couldn't run 30 psi down low of you wanted to. The turbo would do it that's for sure. As far as 25 psi to 7K, that I am not sure about. The housing is a good size, but it is a housing built for spool over top end power. We have plenty of time to find out.
        It's pretty awesome. I love that wheel combo. I have a feeling it'll be all the turbo that motor can handle.
      1. ajm8127's Avatar
        ajm8127 -
        Great results! Glad to see the N55 coming into its own.
      1. Terry@BMS's Avatar
        Terry@BMS -
        Post shift power is pretty solid too. This is a 3->4 on the dynojet.
      1. Tony@VargasTurboTech's Avatar
        Tony@VargasTurboTech -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Post shift power is pretty solid too. This is a 3->4 on the dynojet.
        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. Sticky's Avatar
        Sticky -
        There's so much damn positivity! I love it.
      1. iuhutch's Avatar
        iuhutch -
        N55 FTW....I mean in some sense it's BMW new platform...

        it gives me a stiffy realizing the power of these two collaborating again Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by iuhutch Click here to enlarge
        it it gives me a stiffy releasing the power of these two collaborating again
        lulz
      1. iuhutch's Avatar
        iuhutch -
        A six pack of beer and loads of future excitement got the best of me Click here to enlarge
      1. Linracing's Avatar
        Linracing -
        Nice Job