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  1. #1
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    RB N55 turbo upgrade update from Rob

    http://www.n54tech.com/forums/showthread.php?t=14974

    Ok so I finally got the N55 Turbo and had a chance to take a close look at it via a teardown.
    First off, there have been questions about whether it will work on the N54 or vice versa. The answer to that is yes it could, but not easily. The N54 Twin Turbos have all of the same mounting locations on the top of the flange, but not on the bottom. Due to manifold design and packaging constraints the flanges are secured via studs from the heads at points at which they can be reached for installation and removal jobs. The N54 Twins have studs on the bottom side of the flange that can not be utilized with the N55 Single. What this means is that in order to place the N55 Turbo on the N54 you must remove 5 of the N54 Studs, and redrill the head and add 4 studs in the correct location to properly secure the N55 Turbo. Pending on the casting of the N55 head and if it has provisions for the N54 stud placement (doubtful yet possible), you maybe able to bolt up N54 Twins to the N55 engine. Aside for this mounting fiasco, it does seem doable (at least on the surface).

    Secondly, the N55 Turbo is pretty cool. It does use a custom version of the smallest Borg Warner EFR Billet Compressor wheel (62mm). However it has a custom inducer sizing, which is quite abit smaller than the exact wheel that is used in the BW EFR 62mm (45.8mm vs. the EFR's 49.6mm) with the extended tip technology. It also uses the twin seal arrangement as do the EFRs (not sure if this is common across other BW units). The turbine has the backing plate like the EFRs as well, but I do not think its a Ti wheel. The turbine is also quite small, approx. 53mm Inducer and 46.1mm Exducer. It is a Journal Bearing Turbo, unlike the EFR. Both housings seem to be built on the EFR foundation. Overall it seems like a very nice unit OEM unit, just does not have much flow potential.

    Thirdly, upgrading the unit. BMW has DONE it again. I know some of you are going to say, lop of the turbo, toss on a flange or just weld up another turbo. The problem is that it is NEVER that easy. In this case the original twin scroll manifold has a BMW specific turbine housing inlet that would not adapt to any of the standard available BW twin scroll offerings (ie. based on the T4 flange). It would take some transitional adaptive flanges to be able to even consider such a thing, which is probably another long stretch considering all of the consequences of lowering the turbocharger that much (requiring pretty much all things replaced aside for the exhaust manifold). The compressor housing has plenty of material to upgrade the wheel, there is no issue there when it comes to upgrading. However the turbine housing doesn't seem to have too much to work with and modifying it is fairly complex considering it is twin scroll (the new wheel will have to still retain certain original specs and has to be chosen wisely) and it will be a handful trying to tool into a milling process. If the original turbine can not be upgraded there will be little that can be done short of tossing a larger (potentially mismatched) compressor wheel on the original turbine shaft and hoping for some fair gains. I haven't given up on it, need to do some homework on turbines to see what meets my needs (if anything); but not looking too great on the surface.

    Lopping off the turbo is also not out of the question, but doing so and matching the inlet style will be necessary to have even the slightest chance of success. I need to look further into this as well, but I am not holding my breath.

    Rob



  2. #2
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    Excellent, excellent stuff! Why is nobody talking about this?

    Looks like there is quite a bit to gain with modifying the stock N55 turbo.

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    That is sick news. Almost like the EFR the only difference is the journal bearings..
    Burger Motorsports
    Home of the Worlds fastest N20s, N54s, N55s, S55s, N63s, and S63s!

    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.

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    Maybe this is the start of the n55 really showing its potential.

    First we will hit 500whp on stock turbo....

    Then 800 whp on upgraded turbo...


    then over nine thousand.

    While I'm dreaming I want a v12 sound.

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    Click here to enlarge Originally Posted by turugara Click here to enlarge
    Maybe this is the start of the n55 really showing its potential.

    First we will hit 500whp on stock turbo....
    It will be interesting to see if it can do more on the stock setup than the N54.

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    If you can hit over nine thousand I would be impressed.
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    If you can hit over nine thousand I would be impressed.
    Had to:


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    Click here to enlarge Originally Posted by turugara Click here to enlarge

    First we will hit 500whp on stock turbo....

    Then 800 whp on upgraded turbo...


    then over nine thousand.
    I think you OD"d on Viagra.

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    Ok so I finally got the N55 Turbo and had a chance to take a close look at it via a teardown.
    First off, there have been questions about whether it will work on the N54 or vice versa. The answer to that is yes it could, but not easily. The N54 Twin Turbos have all of the same mounting locations on the top of the flange, but not on the bottom. Due to manifold design and packaging constraints the flanges are secured via studs from the heads at points at which they can be reached for installation and removal jobs. The N54 Twins have studs on the bottom side of the flange that can not be utilized with the N55 Single. What this means is that in order to place the N55 Turbo on the N54 you must remove 5 of the N54 Studs, and redrill the head and add 4 studs in the correct location to properly secure the N55 Turbo. Pending on the casting of the N55 head and if it has provisions for the N54 stud placement (doubtful yet possible), you maybe able to bolt up N54 Twins to the N55 engine. Aside for this mounting fiasco, it does seem doable (at least on the surface).

    Secondly, the N55 Turbo is pretty cool. It does use a custom version of the smallest Borg Warner EFR Billet Compressor wheel (62mm). However it has a custom inducer sizing, which is quite abit smaller than the exact wheel that is used in the BW EFR 62mm (45.8mm vs. the EFR's 49.6mm) with the extended tip technology. It also uses the twin seal arrangement as do the EFRs (not sure if this is common across other BW units). The turbine has the backing plate like the EFRs as well, but I do not think its a Ti wheel. The turbine is also quite small, approx. 53mm Inducer and 46.1mm Exducer. It is a Journal Bearing Turbo, unlike the EFR. Both housings seem to be built on the EFR foundation. Overall it seems like a very nice unit OEM unit, just does not have much flow potential.

    Thirdly, upgrading the unit. BMW has DONE it again. I know some of you are going to say, lop of the turbo, toss on a flange or just weld up another turbo. The problem is that it is NEVER that easy. In this case the original twin scroll manifold has a BMW specific turbine housing inlet that would not adapt to any of the standard available BW twin scroll offerings (ie. based on the T4 flange). It would take some transitional adaptive flanges to be able to even consider such a thing, which is probably another long stretch considering all of the consequences of lowering the turbocharger that much (requiring pretty much all things replaced aside for the exhaust manifold). The compressor housing has plenty of material to upgrade the wheel, there is no issue there when it comes to upgrading. However the turbine housing doesn't seem to have too much to work with and modifying it is fairly complex considering it is twin scroll (the new wheel will have to still retain certain original specs and has to be chosen wisely) and it will be a handful trying to tool into a milling process. If the original turbine can not be upgraded there will be little that can be done short of tossing a larger (potentially mismatched) compressor wheel on the original turbine shaft and hoping for some fair gains. I haven't given up on it, need to do some homework on turbines to see what meets my needs (if anything); but not looking too great on the surface.

    Lopping off the turbo is also not out of the question, but doing so and matching the inlet style will be necessary to have even the slightest chance of success. I need to look further into this as well, but I am not holding my breath.

    Rob

    any progress Rob??

  10. #10
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    Click here to enlarge Originally Posted by turugara Click here to enlarge
    Maybe this is the start of the n55 really showing its potential.

    First we will hit 500whp on stock turbo....

    Then 800 whp on upgraded turbo...


    then over nine thousand.

    While I'm dreaming I want a v12 sound.
    Dream on dude.

  11. #11
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    Definitely want to see power numbersClick here to enlarge
    Click here to enlarge
    1999 M3 AA C30 S/C w/FMIC, UUC Motowerks, Vorsteiner, Bilsteins, Bav Auto, DEPOs

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    Very good news from RB.
    Click here to enlarge



    EURO 04 M3 Current Mods:GC DAs, Eibach Sways, PF RTAB's, RE RCAs, INTRAVEE II, Black Roundels, ///MFEST Badges, Depo's, Screen protector for NAV display, VCSL Bumper + Race Lip & CF Trunk & CF Rear Diffusor, DIETZ TV in Motion, SS= V1 Headers + catless pipes + X-Pipe + SS Sport Exhaust, Z8 Starter Button, Lamin-X, OEM CSL interior, OEM CSL Steering, OEM CSL Intake, OEM CSL Roof, MSS54HP + OEM CSL Tune, BBS CH's, LIGHTWERKZ, 355mm ST40 BBK, BW Oil Cooler....

  13. #13
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    Click here to enlarge Originally Posted by 0-60Motorsports Click here to enlarge
    Very good news from RB.
    Nothing has come of this since February...

  14. #14
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Nothing has come of this since February...
    Im sure once he gets a chance it will develop more but also with the new single turbo setups coming from HPF and Doc race etc...........

    But I like the thought of having upgraded oem turbo's like RB's. If I ever got a 1M in the future I would do full bolt ons and RB Turbos and Custom tune by EVOLVE.
    Click here to enlarge



    EURO 04 M3 Current Mods:GC DAs, Eibach Sways, PF RTAB's, RE RCAs, INTRAVEE II, Black Roundels, ///MFEST Badges, Depo's, Screen protector for NAV display, VCSL Bumper + Race Lip & CF Trunk & CF Rear Diffusor, DIETZ TV in Motion, SS= V1 Headers + catless pipes + X-Pipe + SS Sport Exhaust, Z8 Starter Button, Lamin-X, OEM CSL interior, OEM CSL Steering, OEM CSL Intake, OEM CSL Roof, MSS54HP + OEM CSL Tune, BBS CH's, LIGHTWERKZ, 355mm ST40 BBK, BW Oil Cooler....

  15. #15
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    2 out of 2 members liked this post. Yes Reputation No
    This thread can be deleted. Will post updates on N54Tech.

  16. #16
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    Click here to enlarge Originally Posted by Rob@RBTurbo Click here to enlarge
    This thread can be deleted. Will post updates on N54Tech.
    Thread isn't going to be deleted and any updates will just be added to the thread. Thanks.

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    lol

    Click here to enlarge
    E92 335i SB / Black Leather / 6AT / Navi Prof / Sunroof / Active Steering
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    It will be interesting to see if it can do more on the stock setup than the N54.
    Down low, it has a slight advantage. Up high, it doesn't flow as well. New manifold and new turbo required for top end performance.

  19. #19
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    Click here to enlarge Originally Posted by maxnix Click here to enlarge
    Down low, it has a slight advantage. Up high, it doesn't flow as well. New manifold and new turbo required for top end performance.
    Yes, that post was made 9 months ago...

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    Click here to enlarge Originally Posted by turugara Click here to enlarge
    First we will hit 500whp on stock turbo....
    Maybe with Vargas exhaust manifold and new turbo. Otherwise, no.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Yes, that post was made 9 months ago...
    Just confirming as I have seen the data.

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    Click here to enlarge Originally Posted by maxnix Click here to enlarge
    Just confirming as I have seen the data.
    Understood, most of us have by now. The N55 stock turbo isn't a powerhouse.

  23. #23
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    The motor isnt a powerhouse either...replaced a few set of Vanos at the dealer due to the bolts shearing for no apparent reason.

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    I feel so behind on the N55... Considering my wife is driving the X5 while I am in Kuwait... Looks like I haven't missed much... To see so little development in regards to it, a little disappointing.. I won't be pioneering anymore 'one off' projects with the X5.
    2013 Dodge Challenger R/T: CAI, Catch Can, Shorty Headers, Custom Exhuast, M.M. 87mm Throttle Body, DiabloToona Custom 93 Oct Tune, 190* Thermostat, Seibon CF Grille, 6.4 CAM, Inertia M.S Ported Cylinder Heads
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