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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. bobS's Avatar
        bobS -
        Maybe.......might stop modding and wait for the new M....

        That RB hp/tq curve is real nice though!
      1. NJrep335i's Avatar
        NJrep335i -
        Need to see some numbers!!! I'm sure Terry will come through, without a question. So much happening right now and really no numbers. ugggghhhh..
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Any way to get the .drf files and do a direct overlay?
        I don't have the single turbo DRF files. Only the image Shiv posted of the car.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        I don't have the single turbo DRF files. Only the image Shiv posted of the car.
        Well hopefully somebody shares, don't we have a guy here with the single turbo with an auto? He should have the files.
      1. orange's Avatar
        orange -
        Good info here. It endorses what I originally thought, regardless of the where the power level peaks, the single turbo isn't for me.
      1. dreikraft's Avatar
        dreikraft -
        wish this comparo was done on 0 smoothing and all the graphs scaled the same. the rb torque curve looks sick!

        wheres the overlay of all three?
      1. black bnr32's Avatar
        black bnr32 -
        you guys need more revs
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by dreikraft Click here to enlarge
        wheres the overlay of all three?
        Something we need the .drf files for to do. This is the best we got for now.
      1. 654's Avatar
        654 -
        RBs are an excellent match to the hilarious AT TCU shift points.

        The comparison is skewed because single is at its best at proper revs at around 7k. Let's see dynos showing the results to 7300rpm for getting a complete picture. Yes, I drive manual.
      1. Eleventeen's Avatar
        Eleventeen -
        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

        It doesn't matter if you win by an inch or a mile; winning is winning. 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
        Click here to enlarge well, you've got a couple advantages there beginning with a car that is actually running! heh
        Well I did one trial run in 75 degree weather and got a 7.58 on a 1.48% slope. So I think I took your record, lol. That auto shift right at 130mph kills it. Going to pump the tires up a bit more and see if I can squeeze another mph out of them to avoid the shift. If not I'll need to grab maybe 1/2" taller tires. Next run will be in colder weather too.
      1. bigdnno98's Avatar
        bigdnno98 -
        I really need a vbox Click here to enlarge
      1. 654's Avatar
        654 -
        Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks 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
        Well, you have head job with new valves and considering your car has been down because of it for half of the year, I really hope they will account for some serious enhancements Click here to enlarge
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        Sure hope so too Click here to enlarge we'll see soon enough
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Well I did one trial run in 75 degree weather and got a 7.58 on a 1.48% slope. So I think I took your record, lol. That auto shift right at 130mph kills it. Going to pump the tires up a bit more and see if I can squeeze another mph out of them to avoid the shift. If not I'll need to grab maybe 1/2" taller tires. Next run will be in colder weather too.
        shiiit.. thats nothin to worry about, youll be in 6's in no time,
        .5 in the slope is good for .5 in the 130 Click here to enlarge
      1. dzenno@PTF's Avatar
        dzenno@PTF -
        FWIW mine was on a 1.8% slope but no E85 up here back then and only a 5-11deg tune, stock catted exhaust
      1. longboarder's Avatar
        longboarder -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Well I did one trial run in 75 degree weather and got a 7.58 on a 1.48% slope. So I think I took your record, lol. That auto shift right at 130mph kills it. Going to pump the tires up a bit more and see if I can squeeze another mph out of them to avoid the shift. If not I'll need to grab maybe 1/2" taller tires. Next run will be in colder weather too.
        Hi Terry - I see you've upgraded the 1 a bit !!! 7.5's are no joke in warm weather.

        It appears to me that the BMW community is really prepping nicely for the Airstrip Event...with a lot of people making significant upgrades since the last one. See you there!
      1. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by longboarder Click here to enlarge
        Hi Terry - I see you've upgraded the 1 a bit !!! 7.5's are no joke in warm weather.

        It appears to me that the BMW community is really prepping nicely for the Airstrip Event...with a lot of people making significant upgrades since the last one. See you there!
        Thanks! Got a bit quicker this morning. 7.42 with a 2.1% slope. Still shifting right at the 130 mark though. =/

        Also did a couple 1/4 mile runs too going half throttle out of the hole to keep the trans together. Back to back 130mph. So it's moving pretty well. I hope the trans holds together a little longer!

        Did you get the blower yet? How is it running?
      1. Turkeybaster115's Avatar
        Turkeybaster115 -
        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
        FYI lamborghini no longer makes H-patern manuals. There simply wasn't anymore demand for the dying breed.
      1. LostMarine's Avatar
        LostMarine -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        Thanks! Got a bit quicker this morning. 7.42 with a 2.1% slope. Still shifting right at the 130 mark though. =/

        Also did a couple 1/4 mile runs too going half throttle out of the hole to keep the trans together. Back to back 130mph. So it's moving pretty well. I hope the trans holds together a little longer!

        Did you get the blower yet? How is it running?
        I know the RBs have 130mph in them Click here to enlarge

        He got the blower, and dyno'd should be fun, do you have gopro's T?