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    NG6 Tech Manuals: How the N54/N52 Works (2007 Manuals)

    Tech manuals with information relating to the operation of, and differences between, the N54 and N52.

    Origionally compiled by ksfrogman.
    Attached Images Attached Images

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    Yay! Downloaded these last night, have them on my phone
    Click here to enlarge

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    @Sticky this, very handy references especially for new comers...some of the older stickies should really be removed at this point
    Click here to enlarge

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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    @Sticky this, very handy references especially for new comers...some of the older stickies should really be removed at this point
    List which ones.

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    Click here to enlarge Originally Posted by ATP Click here to enlarge
    Tech manuals with information relating to the operation of, and differences between, the N54 and N52.

    Origionally compiled by ksfrogman.
    Cool all worked.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    List which ones.
    BMW AccessPORT v4.00 BETA Maps Now Available
    N54 Tune Comparison Chart (Detailed)
    Click here to enlarge

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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    BMW AccessPORT v4.00 BETA Maps Now Available
    N54 Tune Comparison Chart (Detailed)
    Unstickied.

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    N54 Diagnostic Fault Tree

    N54 Fault Code List

    These two could be merged into one, same topic
    Click here to enlarge

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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    N54 Diagnostic Fault Tree

    N54 Fault Code List

    These two could be merged into one, same topic
    Merged.

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    This is pretty awesome, thanks
    || DCT | ESS Tune | ACM Test-pipes | AA Green Filter | Swift Spec-R Springs | Stoptech ST-40 F || || My Youtube Channel|| My Vimeo Channel ||

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    @Sticky, you forgot to sticky this thread though..
    Click here to enlarge

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    Click here to enlarge Originally Posted by dzenno@ProTUNING Freaks Click here to enlarge
    @Sticky , you forgot to sticky this thread though..
    That's because you have to say Sticky three times.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    That's because you have to say Sticky three times.
    LOL
    Click here to enlarge

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    That's because you have to say Sticky three times.
    Another fine example of why this site is the best.

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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    Another fine example of why this site is the best.
    This sure feels like a good week.

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    Does anyone have the N54TU documentation (similar to this) that outlines the technical updates to that motor?

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    Click here to enlarge Originally Posted by Kommodore Click here to enlarge
    Does anyone have the N54TU documentation (similar to this) that outlines the technical updates to that motor?
    There's an N54TU?

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    Sometimes called N54HP, or N54B30TO as well from what I was digging up. I was talking to a BMW Master Tech on Saturday and he said they revised the RGE/Oil Separator system to deal with the carbon buildup issues among other things. It was all internal. This is the motor that was used in the later 335is/Z435is, and I believe also the 1M according to what I am seeing here. First thing I said was is it a direct swap? Unforutnately not. So, I wanted to see for myself what exactly was changed. There are most certainly internal documents around somewhere.

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    Click here to enlarge Originally Posted by Kommodore Click here to enlarge
    Sometimes called N54HP, or N54B30TO as well from what I was digging up. I was talking to a BMW Master Tech on Saturday and he said they revised the RGE/Oil Separator system to deal with the carbon buildup issues among other things. It was all internal. This is the motor that was used in the later 335is/Z435is, and I believe also the 1M according to what I am seeing here. First thing I said was is it a direct swap? Unforutnately not. So, I wanted to see for myself what exactly was changed. There are most certainly internal documents around somewhere.
    I can't find any internal documents but yes you are referring to the N54B30TO.

    I didn't think there were any differences really other than software but it seems you found something in the Oil Separator system.

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    Specifically he said that it better atomizes the oil. I suspect that you would still have buildup over time, but the cleaning interval would be much greater than every 10K like I am currently doing.

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    To what type of cleaning is Kommodore referring? Click here to enlarge

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    I probably should have updated this. But, I made the determination some time ago that he must have been talking about the N55 and not the N54, which uses an impact plate for oil separation versus cyclonic separators. After many hours of cross referencing data for the T0 motor, the only difference seems to be software. Why a "Master Tech" would refer to the N55 as the N54TU is anyone's guess.
    Click here to enlarge

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    Click here to enlarge Originally Posted by Kommodore Click here to enlarge
    I probably should have updated this. But, I made the determination some time ago that he must have been talking about the N55 and not the N54, which uses an impact plate for oil separation versus cyclonic separators. After many hours of cross referencing data for the T0 motor, the only difference seems to be software. Why a "Master Tech" would refer to the N55 as the N54TU is anyone's guess.
    This certainly raises more questions than it answers, doesn't it?

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    Well, historically TU motors were vastly improved on the original designs, and the N55 seems to follow that tradition. It's way more efficient, economical, etc. Only problems arise from tuning, which it was never meant to be tuned in the first place. A built N55 with accessible tuning would be pretty interesting to see. I wouldn't be surprised at all if it ended up being the better buy. Just a question of how much longer it will be before we see that.
    Click here to enlarge

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    Click here to enlarge Originally Posted by Kommodore Click here to enlarge
    Well, historically TU motors were vastly improved on the original designs, and the N55 seems to follow that tradition. It's way more efficient, economical, etc. Only problems arise from tuning, which it was never meant to be tuned in the first place. A built N55 with accessible tuning would be pretty interesting to see. I wouldn't be surprised at all if it ended up being the better buy. Just a question of how much longer it will be before we see that.
    The N55 is kind of an N54TU but I don't know the Valvetronic is all that great if you want to tune and then maybe rev it out too.

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