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    • BMW N54 (335i) six-cylinder turbo upgrade comparison dyno charts - Maxed out stock twin turbos vs. upgraded twins vs. single turbo upgrade

      This comes to us from BimmerBoost sponsor Burger Tuning (BMS) who decided to put together a few dyno charts showing the difference between the stock N54 twin turbochargers maxed out, upgraded twin turbos, and the single turbo conversion. These all come from a E9X 335i with an automatic transmisison. As one would expect, the single turbo shifts the powerband to the right making for more peak horsepower but less torque through the entire curve and down low compared to the upgraded twins.

      More insight from Terry@BMS:

      A couple interesting charts to check out.

      The first is maxed out OEM turbos compared with RBs. Both done on the same car a few months apart.

      The second is RBs compared with a single turbo running higher octane and meth. It's an interesting comparison with the single as both cars are automatic so you get an apples to apples feeling for the power curves.

      The single turbo clearly has the edge from 5700-6500rpm but for all around street car use does that gain make up what is lost below 4000rpm? In terms of racing I'd love to see what the 335 auto single runs 60-130. Is it going to be in the 6s or are we looking more like low 7s? Our 135 is around 140# lighter, but makes maybe an average of 35whp less from 5700rpm+ to redline, so I'm curious just how far behind it would wind up. Hopefully I can get some 60-130 testing on ours done this weekend.



      This article was originally published in forum thread: stock vs. RB vs. single dyno comparison started by Terry@BMS View original post
      Comments 109 Comments
      1. boosted-M's Avatar
        boosted-M -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        This is crazy talk.
        It does sound like crazy talk lol...
        It wasnt the main reason I sold it, I have another BMW M car in the stable and wanted to try the twin turbo platform out.. I do love the TQ and traction of the 335xi.. My ESS VT2-600 was an awesome highway car though!!!
      1. marv85's Avatar
        marv85 -
        Click here to enlarge Originally Posted by boosted-M Click here to enlarge
        It does sound like crazy talk lol...
        It wasnt the main reason I sold it, I have another BMW M car in the stable and wanted to try the twin turbo platform out.. I do love the TQ and traction of the 335xi.. My ESS VT2-600 was an awesome highway car though!!!
        if you loved the TQ wait until you tune it Click here to enlarge
      1. Terry@BMS's Avatar
        Terry@BMS -
        Yes during a 50-150mph race the RBs are at a disadvantage as that type of a race favors the higher RPM power curve. But I'm looking forward to racing their automatics anyway! But loosing in a 50-150mph rolling airport runway race doesn't mean the single will run quicker 1/4 mile times... Maybe they will let us do some runs from a dig like they did at the last event. Click here to enlarge
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by ChuckD05 Click here to enlarge
        terry you dont need a headlight to do a 60-130 !!! lol

        do one tonight...

        hopefully the headlights get there sooner than later and the parts on them actually solve your issue.. if you have motor issues you can always get that coded out as its really not ness to have your bulbs turn with the wheel so you look cool lol...

        I think fedex said they should get there saturday at the latest though so hopefully by Sunday we get some results.
        I think my private track is open Sunday so we'll see if weather and family cooperate. Click here to enlarge
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
        Good data, hope to see what you get from that 60-130...6sec or bust! Click here to enlarge
        I'll have to work my way to 6s. First test will be basically as it was run on the dyno with the seats out but baby seat in. My daily driver trim. Then based on that I'll figure out how much more aggressive it needs to be for that 6s run. I may need to finally switch to a lighter aftermarket exhaust, raise the boost up another psi up top, start running 100% E85, replace the turbo inlet hoses, remove more weight, etc. We'll see!

        Have yours back together yet? What is it running these days on the aggressive Cobb tuning? Low 7s?
      1. themyst's Avatar
        themyst -
        6AT single turbos are such fail.

        Funny thing is I bet @Sikh335 single turbo is even slower than the 58mms due to its oversized turbo. Curious how Shiv didn't post anything from SIKH car. Click here to enlarge
      1. Terry@BMS's Avatar
        Terry@BMS -
        I'm surprised none of them are posting 60-130 times or drag times? I mean you spend 10k on something you think you'd want to run out and enjoy it?
      1. themyst's Avatar
        themyst -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        I'll have to work my way to 6s. First test will be basically as it was run on the dyno with the pass seat out. Daily driver trim. Then based on that I'll figure out how much more aggressive it needs to be for that 6s run. I may need to finally switch to a lighter aftermarket exhaust, raise the boost up another psi up top, start running 100% E85, replace the turbo inlet hoses, etc. We'll see!

        Have yours back together yet? What is it running these days on the aggressive Cobb tuning? Low 7s?
        I think low to mid 7s is possible even for my full weight car.
      1. jpsimon's Avatar
        jpsimon -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        I'm surprised none of them are posting 60-130 times or drag times? I mean you spend 10k on something you think you'd want to run out and enjoy it?
        They probably are out enjoying it. You don't have to go to a 1/4 track to enjoy a car. I've personally never seen a 1/4 track with my own eyes yet still enjoy the $#@! out of my car!

        That being said, now that temps are starting to drop I'm sure we'll see more 1/4 times pop up.
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by jpsimon Click here to enlarge
        They probably are out enjoying it. You don't have to go to a 1/4 track to enjoy a car. I've personally never seen a 1/4 track with my own eyes yet still enjoy the $#@! out of my car!
        They they all live next to one of the best tracks in the country? And there are lots of long flat roads up there not far out of town...
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Have yours back together yet? What is it running these days on the aggressive Cobb tuning? Low 7s?
        Click here to enlarge not running yet, its getting put back together slowly, should be ready to play next week
      1. Terry@BMS's Avatar
        Terry@BMS -
        Sweet!! Race you to 6s? Click here to enlarge
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Sweet!! Race you to 6s? Click here to enlarge
        Click here to enlarge well, you've got a couple advantages there beginning with a car that is actually running! heh
      1. Legionofboom's Avatar
        Legionofboom -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Sweet!! Race you to 6s? Click here to enlarge
        luls this comment was like, hahah race to see who is faster googogogogo lolol
      1. LostMarine's Avatar
        LostMarine -
        great info!

        Also, JP, some people, didnt buy the 335 to mod so highly, they just wanted a sleek bimmer.. just as it was in my case. Just turns out a JB2 was a cheap and effective upgrade.. and then you get carried away again..
      1. Sticky's Avatar
        Sticky -
        Promoted to front page with intro paragraph:

        This comes to us from BimmerBoost sponsor Burger Tuning (BMS) who decided to put together a few dyno charts showing the difference between the stock N54 twin turbochargers maxed out, upgraded twin turbos, and the single turbo conversion. These all come from a E9X 335i with an automatic transmisison. As one would expect, the single turbo shifts the powerband to the right making for more peak horsepower but less torque through the entire curve and down low compared to the upgraded twins.

        More insight from Terry@BMS:
      1. Terry@BMS's Avatar
        Terry@BMS -
        Sweet. Article status! Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Any way to get the .drf files and do a direct overlay?
      1. bobS's Avatar
        bobS -
        This makes me want to get meth.....
      1. LostMarine's Avatar
        LostMarine -
        and upgraded turbos Click here to enlarge