• 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. VargasTurboTech's Avatar
        VargasTurboTech -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        There is definitely a little more power in there. We'll have to find some way to get a bung on there to measure the back pressure. We're running around 85% duty cycle now @ 20psi on a cold night. On timing, the motor has a pretty tight combustion chamber compared to the N54. For example on the stock turbo it's making peak power at only 8 degrees advance on E85+meth. We may have it over timed a bit right now at 9 degrees. I did a little work on the dyno adding +1 degree, etc, and power didn't really pick up. But didn't have time to do the full normal sweep I'd like to do. It will come with time though. Shifting around 6000rpm seems to give the best "power to the ground" through the gears as currently tuned.
        Once you get a higher boost threshold you can really play with it, capped at 20 psi is holding you back. You will want to read BP before the turbo not after it if possible, doing that is almost impossible with the turbo on the car, post turbo BP will still tell you something though. Would be interested in seeing it. Next one we put on will have the full array, SS, BP, EGT, analog boost. Then we can really see whats going on, until you get up near 3:1 BP you are fine, 2:1 is considered an efficient set up. Looking forward to seeing where it goes, but its not up to its full potential yet. Can you adjust the vanos at all with the JB or does that to wait for the flash?
      1. fastgti69's Avatar
        fastgti69 -
        There has been so much more technical info now instead of all that bickering. Love you guys, Tony if you come down to LA, hit me up. I'll buy you and Terry a beer, and you guys can turbo talk all day LOL
      1. VargasTurboTech's Avatar
        VargasTurboTech -
        Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
        There has been so much more technical info now instead of all that bickering. Love you guys, Tony if you come down to LA, hit me up. I'll buy you and Terry a beer, and you guys can turbo talk all day LOL
        I am down in LA all the time. I still have a place in Hollywood, but I think you guys are a lot further North right?
      1. fastgti69's Avatar
        fastgti69 -
        Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
        I am down in LA all the time. I still have a place in Hollywood, but I think you guys are a lot further North right?
        Bro, I swear I have seen you in Hwood before then. I knew your face looked familiar, (FB pics). Terry lives pretty far. I live 10 minutes from Hollywood, I'm in the valley LOL.
      1. VargasTurboTech's Avatar
        VargasTurboTech -
        Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
        Bro, I swear I have seen you in Hwood before then. I knew your face looked familiar, (FB pics). Terry lives pretty far. I live 10 minutes from Hollywood, I'm in the valley LOL.
        I have never been out in Hollywood before. No idea what you are talking about...Click here to enlarge
      1. bigdnno98's Avatar
        bigdnno98 -
        LMFAO!

        Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
        I have never been out in Hollywood before. No idea what you are talking about...Click here to enlarge
      1. fastgti69's Avatar
        fastgti69 -
        Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
        I have never been out in Hollywood before. No idea what you are talking about...Click here to enlarge
        Hahaha, don't trip brotha, i rarely go to Hwood anyways. All my buddies are club rats though, they literally live there.



        Anyways, back on topic. Interested to see this turbo at the efficiency range, 25 psi + will be nice power.
      1. Tzu's Avatar
        Tzu -
        Thats a very clean log. Looks like it might hold ~20psi at 100% WGDC. Great results T.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
        I am down in LA all the time. I still have a place in Hollywood, but I think you guys are a lot further North right?
        Why do you have a place in hollywood and what do you with it?
      1. VargasTurboTech's Avatar
        VargasTurboTech -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Why do you have a place in hollywood and what do you with it?
        LA was my home for 12 years. I kept my place when I moved back up north to take back over the Turbo business. I use it to stay in when I am in LA... DUH...Click here to enlarge
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
        Once you get a higher boost threshold you can really play with it, capped at 20 psi is holding you back. You will want to read BP before the turbo not after it if possible, doing that is almost impossible with the turbo on the car, post turbo BP will still tell you something though. Would be interested in seeing it. Next one we put on will have the full array, SS, BP, EGT, analog boost. Then we can really see whats going on, until you get up near 3:1 BP you are fine, 2:1 is considered an efficient set up. Looking forward to seeing where it goes, but its not up to its full potential yet. Can you adjust the vanos at all with the JB or does that to wait for the flash?
        Right now we can't do any valvetronic adjustment with the JB4 or the Cobb flash. Just need to wait for them to unlock and add those tables.
      1. VargasTurboTech's Avatar
        VargasTurboTech -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Right now we can't do any valvetronic adjustment with the JB4 or the Cobb flash. Just need to wait for them to unlock and add those tables.
        Gotcha
      1. maxnix's Avatar
        maxnix -
        No MAP on early N55. It is MAF only.

        Great work guys.

        Now go back and erase all those whiny posts!
      1. maxnix's Avatar
        maxnix -
        Click here to enlarge Originally Posted by paradoxical3 Click here to enlarge
        Cobb can't figure out how to work with 2012+ ECU's.
        1024 bit RSA encryption is very difficult to break. We'll see. No one else has done it yet.
      1. maxnix's Avatar
        maxnix -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Right now we can't do any valvetronic adjustment ... the Cobb flash.
        My understanding is they are accessible but not yet fully researched.
      1. paradoxical3's Avatar
        paradoxical3 -
        Click here to enlarge Originally Posted by maxnix Click here to enlarge
        1024 bit RSA encryption is very difficult to break. We'll see. No one else has done it yet.
        Everyone should just donate $10 and buy Cobb some time with IBM Watson.

        Or $#@! it, someone write a Cobb distributed computing program like folding@home and let's all crack it (yes, I'm aware it's not physically possible, it's a joke).

        EDIT: Hey, COBB http://au.ibtimes.com/articles/20100...024-hacked.htm
      1. iuhutch's Avatar
        iuhutch -
        Damn really!? I work in retail that also owns a bank division and that's the same VPN encryption we have! What are they trying to hide in there!!??
      1. inlineS54B32's Avatar
        inlineS54B32 -
        Click here to enlarge Originally Posted by iuhutch Click here to enlarge
        Damn really!? I work in retail that also owns a bank division and that's the same VPN encryption we have! What are they trying to hide in there!!??
        I think it's not about hiding anything, just trying to prevent people from easily modifying things and then claiming warranty. Click here to enlarge

        They also likely sell the key to some people (Dinan?) so they can tune? I am not certain of that, but would guess it's true.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by paradoxical3 Click here to enlarge
        Or $#@! it, someone write a Cobb distributed computing program like folding@home and let's all crack it (yes, I'm aware it's not physically possible, it's a joke).
        Dude, dude, DUDE! I'm all for this. Imagine if all automotive enthusiasts used collective computing power to crack ECU's. Instead of nonsense like searching for extraterrestrial life we could make a real difference here on Earth.

        I bet auto manufacturers never even thought enthusiasts might go that far. I'm in to make this happen.

        Why exactly can't we do it?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by inlineS54B32 Click here to enlarge
        I think it's not about hiding anything, just trying to prevent people from easily modifying things and then claiming warranty.
        But... then why don't they give us the option to forego the warranty and get the ECU unlocked?