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  1. #1
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    Would I be able to upgrade my 335i's turbo to a bigger one like a 6266 or something?

    As the title says you guys, would I be able to upgrade my '12 335i stock turbo to a bigger turbo? I haven't seen anyone do it yet except VTT and PureTurbo. But I'm wondering if you just buy the turbo separately like a Garret and take it to a shop and they do the rest of the work. What would it cost including the rest of the parts, if possible? Any info would be great, thanks.

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    VTT is modifying the stock turbo I believe.

    Regarding a larger turbo, you'll have to wait for someone to produce a manifold or you can modify the stock manifold.

  3. #3
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    Check this one out:
    ,

    They are called Sound Performance. They've done the 6266 conversion, as long as you have the kit, tuning shouldn't be a problem. Terry or the guys at PTF can always help you out. Try contacting them :Click here to enlarge

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    Ok thanks you guys

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    Make sure you have a '12 that can be flash tuned. Only the early 2012's can be. If you are the later '12 then you won't be able to go to that big of a turbo without something like a Motec.

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    Click here to enlarge Originally Posted by JET Click here to enlarge
    Make sure you have a '12 that can be flash tuned. Only the early 2012's can be. If you are the later '12 then you won't be able to go to that big of a turbo without something like a Motec.
    What changed? ECU?

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    PTF says there turbo kits are N55 compatible, or just cut the stock turbo off the manifold, weld on a vband and fit the biggest turbo you can in the space, which is not much when I had a look. But I have a steering column in the way as well.
    But like other said make sure your car is Cobb compatible first or you won't be able to tune it properly.

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    We should really be seeing more big turbo N55's by now.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    What changed? ECU?
    Yeah at some point in 2012 when they switched to F30 they changed the ECU from 256 bit RSA encryption to 1024 bit (like all of the new M3/4 etc DME's.
    Cobb hasn't cracked it yet and as far as I know they haven't promised that they will be able to anytime soon.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    We should really be seeing more big turbo N55's by now.
    I think part of the problem is the only N55's that can be backend flashed are the 2011's and a few early 2012's so the vast majority of N55's would have to do piggyback alone to tune a big turbo.
    Also I dont think Vargas has tested the shotgun HPFP kit on an N55 yet (?) so if we went big turbo we would need to rely on lots of meth.

    It could definitely be done but these barriers are probably why there aren't more big turbo N55s

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    Click here to enlarge Originally Posted by subaru335i Click here to enlarge
    I think part of the problem is the only N55's that can be backend flashed are the 2011's and a few early 2012's so the vast majority of N55's would have to do piggyback alone to tune a big turbo.
    Also I dont think Vargas has tested the shotgun HPFP kit on an N55 yet (?) so if we went big turbo we would need to rely on lots of meth.

    It could definitely be done but these barriers are probably why there aren't more big turbo N55s
    You make a very good point here. If we had the entirety of N55's to choose from, well, that would definitely increase the aftermarket interest.

  12. #12
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    Click here to enlarge Originally Posted by subaru335i Click here to enlarge
    Yeah at some point in 2012 when they switched to F30 they changed the ECU from 256 bit RSA encryption to 1024 bit (like all of the new M3/4 etc DME's.
    Cobb hasn't cracked it yet and as far as I know they haven't promised that they will be able to anytime soon.
    BMW is so enthusiast friendly... $#@!s.

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    Well i hear on ecu tune part we are not that far off a real tune nowadays. But we still lack the hardware.

  14. #14
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    Click here to enlarge Originally Posted by Darkiedm4 Click here to enlarge
    Well i hear on ecu tune part we are not that far off a real tune nowadays. But we still lack the hardware.
    We have the hardware, just have to get it on an n55 and have Terry work at it!
    Burger Motorsports
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  15. #15
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    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    We have the hardware, just have to get it on an n55 and have Terry work at it!
    That sounds intresting and has my intrest as well Click here to enlarge

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    Guys, slightly off topic.. My N55 is the first gen built early '10. in relation to the engine internals, do they differ from lets say a '12 n55 or F30 n55 motor? im looking at a pure turbo and not sure if its safe to introduce more power with FBO + meth? sorry for the noob question btw..

  17. #17
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    The f2x 35i's have a forged crank and the post 2013 july n55's also have different wg/turbo and bigger outlet to downpipe.

    I believe besides the crank parts are the same.

  18. #18
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    I don't think anyone really knows if the N55 (any version) is as strong or less than the N54. I do know the rumors that N54 is all forged and the N55 all cast is not true.
    N54 still had casts pistons and so does the N55. I wouldn't be scared pushing the N55 with a bigger turbo.

  19. #19
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    Should not be an issue, several guys out there with Pure stage 1 units and some with the VTT stage 2 putting down 475whp.

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