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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. Sticky's Avatar
        Sticky -
        I think this shall be front paged. Good stuff Terry.
      1. jpsimon's Avatar
        jpsimon -
        Wait maybe i'm missed something but why aren't you comparing it to the higher single turbo numbers (654whp)?
      1. jpsimon's Avatar
        jpsimon -
        oh just because it's an auto? I don't think I will ever in my life understand why someone would want to mod an automatic car when a manual version is available.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by jpsimon Click here to enlarge
        oh just because it's an auto? I don't think I will ever in my life understand why someone would want to mod an automatic car when a manual version is available.
        Because the Auto is faster, more consistent, and better for drag racing?

        Manuals are fun and all but there are better performance options these days.
      1. jpsimon's Avatar
        jpsimon -
        ... and extremely boring to drive. I guess if you live your life 1/4 mile at a time and don't care about how fun it is to drive the car it makes sense. I'll still never understand. but that's just me
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by jpsimon Click here to enlarge
        oh just because it's an auto? I don't think I will ever in my life understand why someone would want to mod an automatic car when a manual version is available.
        Many of us drive and love the automatics. Click here to enlarge

        With the manual they are extending the RPM range up to 7200rpm which provides further gains while the RBs max out around 6500rpm on manual cars, so in that regard it's not much of a comparison for manual owners. Although, they still suffer from the lower RPM torque loss with the single. The few who have them claim it's a worthwhile trade off for the top end power. Fair enough. But I like my low end torque and like automatics. Click here to enlarge
      1. jpsimon's Avatar
        jpsimon -
        to each there own i guess, i seriously just can't wrap my head around it. I commute 70 miles or so round trip to work every day and sit in a ton of traffic, yet never once has getting an auto even remotely crossed my mind. oh well
      1. blisstik's Avatar
        blisstik -
        I overlaid them as evenly as I could. Question: does that single have 4 meth nozzles? So the 58 "only" maxes at 560whp?

        Attachment 21593
      1. jpsimon's Avatar
        jpsimon -
        There will be some good videos from that shift sector event in november. Multiple single turbo guys will be there so some actual real life comparisons will be made
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by jpsimon Click here to enlarge
        ... and extremely boring to drive. I guess if you live your life 1/4 mile at a time and don't care about how fun it is to drive the car it makes sense. I'll still never understand. but that's just me
        Yep, it's you.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Many of us drive and love the automatics. Click here to enlarge

        With the manual they are extending the RPM range up to 7200rpm which provides further gains while the RBs max out around 6500rpm on manual cars, so in that regard it's not much of a comparison for manual owners. Although, they still suffer from the lower RPM torque loss with the single. The few who have them claim it's a worthwhile trade off for the top end power. Fair enough. But I like my low end torque and like automatics. Click here to enlarge
        So every graph there is the automatic including stock turbo correct?
      1. piele_bps's Avatar
        piele_bps -
        +1000 jpsimon.

        I would love to see Terry against a few singles at that event.
        I'll bet he will lose, but it will be fun.
      1. marv85's Avatar
        marv85 -
        Unfortunately, at that event, the race is skewed towards the power curve of the single.
      1. Legionofboom's Avatar
        Legionofboom -
        @Terry@BMS

        What would you suggest for a transmission upgrade for the automatics?


      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Hopefully I can get some 60-130 testing on ours done this weekend.
        Good data, hope to see what you get from that 60-130...6sec or bust! Click here to enlarge
      1. boosted-M's Avatar
        boosted-M -
        Click here to enlarge Originally Posted by jpsimon Click here to enlarge
        to each there own i guess, i seriously just can't wrap my head around it. I commute 70 miles or so round trip to work every day and sit in a ton of traffic, yet never once has getting an auto even remotely crossed my mind. oh well
        My commute is the same with half highway and the other half stop & go.. I sold my manual Supercharged E92 M3 coupe to get my E92 335xi coupe auto with paddle shifters simply because of the PITA it was with the manual.. I never thought I would enjoy an Auto but after driving a few DCT M3's both NA and boosted I was sold. Understand I do not have the DCT in my XI although I wish BMW would add the option to the XI model, I do like my FBO 335xi with m-sport package as a daily driver and I can smoke my M3 in the 1/8mile and slap on some snows for the winter Click here to enlarge Best of both worlds IMHO
      1. ChuckD05's Avatar
        ChuckD05 -
        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.
      1. marv85's Avatar
        marv85 -
        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...
        hahaha
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by marv85 Click here to enlarge
        Unfortunately, at that event, the race is skewed towards the power curve of the single.
        Very valid point.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by boosted-M Click here to enlarge
        I sold my manual Supercharged E92 M3 coupe to get my E92 335xi coupe auto with paddle shifters simply because of the PITA it was with the manual..
        This is crazy talk.