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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. Terry@BMS's Avatar
        Terry@BMS -
        Click here to enlarge Originally Posted by LostMarine Click here to enlarge
        for the love of god, someone please take an RB car to the track (with the ambition to go fast Click here to enlarge )
        One of our 335 guys just went 11.1 on a 1.75 60'. He has a shot at 10s with a better launch or some weight removal. Click here to enlarge
      1. bigdnno98's Avatar
        bigdnno98 -
        Awesome! Was it a forum member?
      1. rudypoochris's Avatar
        rudypoochris -
        Hey Terry, what does IAT and PWM look like for those RBs? Really nice power curve.... full spool by 2750rpm! What map was that on?
      1. Terry@BMS's Avatar
        Terry@BMS -
        The dyno guy is on e90post, I think. I suspect he will post the details sooner or later. On the JB4 for integrated methanol use you always use map 3. The 11.1 guy doesn't use the forums but someone posted his slip on n54tech for him.
      1. bigdnno98's Avatar
        bigdnno98 -
        Click here to enlarge Originally Posted by Terry@BMS Click here to enlarge
        The dyno guy is on e90post, I think. I suspect he will post the details sooner or later. On the JB4 for integrated methanol use you always use map 3. The 11.1 guy doesn't use the forums but someone posted his slip on n54tech for him.
        Oh, ok. I'll have to check it out. The slip that is.
      1. LuSt4Boost's Avatar
        LuSt4Boost -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        What are you talking about? A manual IS offered.
        I thought the F10 M5 was automatic (DCT)?
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LuSt4Boost Click here to enlarge
        I thought the F10 M5 was automatic (DCT)?
        First of all DCT is not an automatic.

        Secondly, the F10 M5 is available in the USA in manual and dual clutch.
      1. LuSt4Boost's Avatar
        LuSt4Boost -
        Click here to enlarge Originally Posted by LuSt4Boost Click here to enlarge
        I thought the F10 M5 was automatic (DCT)?
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        First of all DCT is not an automatic.

        Secondly, the F10 M5 is available in the USA in manual and dual clutch.
        Call it what you want. I know its technically not an "automatic", but it doesn't have the use of a clutch pedal and switches gears without the input of the driver... so yeh, automatic.


        And I realized after reading a few articles that the F10 M5 came out in 6-speed manul shortly after the dual-clutch model. Either way, a "true" manual was released after the "automatic" :p
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by LuSt4Boost Click here to enlarge
        Call it what you want. I know its technically not an "automatic", but it doesn't have the use of a clutch pedal and switches gears without the input of the driver... so yeh, automatic.
        That's exactly my point, it's technically not an automatic. It technically is a dual clutch. This is a technical forum where we use the correct terms.

        Click here to enlarge Originally Posted by LuSt4Boost Click here to enlarge
        And I realized after reading a few articles that the F10 M5 came out in 6-speed manul shortly after the dual-clutch model. Either way, a "true" manual was released after the "automatic" :p
        Yes, after the DCT. Click here to enlarge