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      12-04-2018, 02:14 PM   #1
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Lightbulb THE ULTIMATE Turbo Upgrade Thread

With so little information on our forum regarding all of the different turbo upgrade options available, enthusiasts may not recognize the many options available for the N55 M2. This thread is an attempt to compile all of the upgrades currently available on the market to help you when choosing which route you may want to go.

Turbo upgrade options for the N55 loosely fall into three turbo stages. These stage definitions are exclusive to the N55, as stages on different motors often have different meanings.
Stage 1: Hybrid turbo using stock housing with an upgraded compressor wheel. Similar spool to stock with more headroom to breath at higher rpm. Estimated 40-75hp gain.

Stage 2: Hybrid turbo using stock housing with larger upgraded compressor and turbine wheels. Typically have a slight delay in turbo spool (lag) from 300-700rpm but provide much better power to redline. Estimated 100-150hp gain.

Stage 3: Completely new turbo and manifold. Many of these kits were designed for other N55 applications and may require fabrication to fit onto the M2. Usually comprised of a ball bearing turbo with quick spool and higher overall hp potential. Estimated 150-400hp gain dependent on turbo selection.
Shortcut to each manufacturer's post:
I have gathered as much information as I could find on each available option and created the following spreadsheet. I welcome any additional information, corrections, etc. which may be helpful:

https://docs.google.com/spreadsheets...it?usp=sharing

Disclaimer: I do no proclaim to be a turbo expert and am gathering the following information as a jumping off point for discussion and knowledge gathering. Feel free to add your own comments and expertise.
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      12-04-2018, 02:15 PM   #2
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Dinan
"Big Turbo"

Manufacturer's Description:
For the racing enthusiast or those just looking for the best, this is the ultimate upgrade to fully maximize the power output of your F87 M2. The stock turbocharger is replaced with one that utlizes a larger compressor wheel that allows ~30% greater flow, thus enabling additional boost pressures at higher engine speeds while retaining efficiency. These are fully cast turbos that are manufactured to Dinan specifications along with an upgraded thrust system over the stock turbo to ensure reliable and prolonged life. In order to attain maximum advertised power gains these big turbos will need to be paired with DINANTRONICS Stage 4, as well as Dinan’s intercooler to fully regulate the boost increase and deliver a polished product although the exhaust and intake are also recommended.
Benefits of the Dinan Big Turbo for the EWG N55 Engine:
+ Fully cast turbo that is manufactured to Dinan specifications with an upgraded thrust system thereby avoiding lengthy turnaround times caused by a core exchange program.
+ Larger billet compressor/impeller wheel that allows ~30% greater flow over stock which then enables additional boost to be realized while retaining efficiency.
+ Peak power: 446 HP @ 6500 RPM and 458 ft-lbs @ 4500 RPM with max gains of 101 HP @ 6500 RPM and 86 ft-lbs @ 4500 RPM when coupled with other Dinan Performance upgrades.
+ Dinan Installation instructions detail a procedure which is quicker than BMW's turbo replacement procedure saving the end-user money and time at the shop.
+ Includes o-rings and gaskets needed for complete installation.
+ Factory matching new car warranty (4yr/50k) when run in Dinan specification.
+ 50 State Emissions legal; CARB EO # D-176-49.

Source:
https://www.dinancars.com/product/D3...bo-bmw-f87-m2/

Installation Guide:
http://files.dinancars.com/webresour...2e24ee07dc.pdf
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      12-04-2018, 02:16 PM   #3
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Pure Turbos

Stage 1
Manufacturers Description:
Stg1: Top end gains of up to 70whp depending on supporting mods.

Stage 2
Manufacturers Description:
"The Wolf in Sheep's Clothing"
-Engineered to reach 500+whp.-Utilizes all OEM housings. Appears unmodified stock from the outside. This is not a TD05 CHRA fitted into the housings like other Stage 2 offerings.
-Upgraded Point-Milled Billet Compressor Wheel
-Upgraded HiFlow Turbine Wheel
-Dual Compressor Oil Seals, Dual Turbine Oil Seals
-Large Diameter 360 Thrust Upgrade
-Extensive Turbofold Modifications and Machining
-VSR Balanced of course

We recommend our N55 High Flow Inlet Pipe with the Stage 2. The OE inlet pipe is restricted to a 1.85" inside diameter.

Source:
Stage 1: https://www.pureturbos.com/store/oem...o-upgrade.html
Stage 2: https://www.pureturbos.com/store/bmw...e-stage-2.html
Stage 2 M2: https://www.pureturbos.com/store/bmw...ade-turbo.html
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      12-04-2018, 02:17 PM   #4
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TheTurboEngineers (TTE)

TTE460
Manufacturers Description:
TTE460 begins as a brand new standard N55 turbocharger that we dismantle and then set about upgrading and optimising to create our upgrade turbocharger. TTE460 Turbocharger offer great power and spool for the range of N55 vehicles.

The formula to making a TTE460 starts with a much larger TTE billet compressor wheel, chosen because is highly efficient, new generation type with very thin blades, creating extremely high flow for comparative size, giving a compressor map that's very wide. The Re-Profiled compressor cover is machined to a optimized tolerance to ensure maximum compressor efficiency. Also the intake pipe is larger and ported to give a smooth transition for the incoming air flow.

A key part to driving the large TTE compressor and in turn making this unit produce the power advantage over stock is fitting a curved clipped turbine and shaft. This turbine gives lower back pressure and keeps EGT lower compared to stock turbine.

The clipping of the turbine. Clipping reduces blade area thus increasing gas flow and so reducing back pressure and lowering exhaust gas temperatures, allowing safer higher boost level's. This process also gives a secondary advantage of removing some material, lightening the turbine thus reducing rotational mass improving moment of inertia.

Precisely balancing our turbochargers is a key critical factor to become a TTE upgrade unit as longevity and performance are paramount. Good balance improves acoustics also. Subsequent great care is taken with all TTE turbochargers to achieving our balance standards. Firstly parts are balanced at slow speeds up to 2800RPM in multiple planes using our single parts machine, then components are assembled and then the CHRA is dynamically balanced, but this time depending on application at up to 250,000 RPM in multiple planes using our in house VSR machine to acquire the ultimate equilibrium, to a standard far higher than OEM. Each turbocharger is supplied with serial numbered balance test result document.

TTE550
Manufacturers Description:
BMW TTE550 begins as a brand new standard N55 turbocharger that we dismantle and then set about upgrading and optimizing to create our upgrade turbocharger.

BMW TTE550 Turbocharger offer great power and spool for the range of N55 vehicles with Electronic Wastegate, manufactured after July 2013 such as the BMW M2, M135i, M235i, 335i & 435i. Capable of 550bhp+ with the correct supporting modifications and custom tuning.

The formula to making a TTE550 starts with a much larger TTE billet compressor wheel, chosen because is highly efficient, new generation type with very thin blades, creating extremely high flow for comparative size, giving a compressor map that's very wide. The Re-Profiled compressor cover is machined to a optimised tolerance to ensure maximum compressor efficiency. Also the intake pipe is larger and ported to give a smooth transition for the incoming air flow.

A key part to driving the large TTE compressor and in turn making this unit produce the power advantage over stock is fitting a larger 9 blade last Gen. turbine and shaft. This turbine gives lower back pressure and keeps EGT lower compared to stock turbine.

The Larger 9 blade last Gen. Turbine increase gas flow and so reducing back pressure and lowering exhaust gas temperatures, allowing safer higher boost level's. This process also gives a secondary advantage of removing some material, lightening the turbine thus reducing rotational mass improving moment of inertia.

Precisely balancing our turbochargers is a key critical factor to become a TTE upgrade unit as longevity and performance are paramount. Good balance improves acoustics also. Subsequent great care is taken with all TTE turbochargers to achieving our balance standards. Firstly parts are balanced at slow speeds up to 2800RPM in multiple planes using our single parts machine, then components are assembled and then the CHRA is dynamically balanced, but this time depending on application at up to 250,000 RPM in multiple planes using our in house VSR machine to acquire the ultimate equilibrium, to a standard far higher than OEM. Each turbocharger is supplied with serial numbered balance test result document.

Features
Genuine Housings & Components
Highly Efficient Next Gen Billet Compressor Geometry
Optimised Compressor Cover Machining Clearances
Special Curved Clipped Turbine
Genuine actuator
Genuine diverter valve
Dynamically Balanced & Supplied with test result documents
Fitment As Original. Plug & Play
470+ PS Capable on 98ron (TTE460)
550+ PS Capable on 98ron (TTE550)
Designed, Machined & Built by TTE in Germany

Source:
TTE460: https://www.theturboengineers.com/fu...1/25/%3Fi%3D25
TTE550: https://www.mlperformance.co.uk/prod...235i-335i-435i
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      12-04-2018, 02:18 PM   #5
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Steamspeed

STX67
Manufacturers Description:
The Steam STX 67 for BMW N55 is a direct replacement stock-location turbo for BMW owners with BMW's new TwinPower (twin scroll) 3.0 l inline 6 direct injection motors (BMW engine code N55). The N55 is motor is used extensively throughout the BMW lineup, but includes: M135i (E82/E88/F20), 335i (E90/E92/F30), etc.

The Steam STX 67 for BWM TwinPower N55 engines provides turnkey stock location replacement of the OEM turbo. This means your turbo will appear stock, and can utilize exhaust, intercoolers, and intakes designed for the stock turbo.

Made from all brand new components, so there are no core deposits, and you don't have to return your factory turbo. The turbo is brand new instead of a rebuilt used OEM turbo.

The STX 67 compressor wheel is 5-axis CNC milled billet aluminum and flows ~25-30% more than the stock turbo.

STX78R
Manufacturers Description:
The STX 78R is quite a bit larger than the STX 67, about +11mm on the exducer side. Based strictly on the comp wheel, this turbo should be able to make between 500-600 whp, but the OEM turbine housing should limit that to some degree. Initial dyno testing will show to what degree.

Base purely on inductive reasoning, this turbo should perform somewhat better than the currently popular Pure Stage 2 turbo: their turbo has wheels somewhat larger than a GTX3076R, our 78R is somewhat larger than a GTX3076R, they remachine the OEM housings, so do we, but the main difference is that our turbo has a BB center section, and Pure reuses the OEM JB CHRA. Given that the only main difference that impacts performance is that our has a BB CHRA, what does that impact?

BB CHRAs have some standard advantages over JB: it is more responsive especially with transient boost, it is more efficient, it is more durable, etc. In this case, the biggest difference, I think, will be the fact that BB CHRAs can be stay efficient in spite of backpressure much better that a JB CHRA. Normally JB is fine up to 2:1, but BB can still be efficient at much higher ratios. This matters a lot in this case, because the OEM manifold/turbine housing is going to generate a lot of backpressure when you try to make over 500 whp.

Specs:
Bearing System: custom ceramic BB
Custom Compressor wheel In:59 / Ex:78 (the size is between GTX3076 and GT3582)
Custom Turbine wheel In:60 / Ex:57 (The size slightly bigger than GT3076 - In:60 / Ex:55).
Flow capacity: 70 lbs/min (est.)
Estimated WHP: ~550+ whp

Source:
STX67: http://http://steamturbochargers.com...r-upgrade.html
STX78R: http://steamturbochargers.com/index....r-bmw-n55.html
Steamspeed Blog: https://blog.steamspeed.com/2018/03/...w-n55-install/
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      12-04-2018, 02:18 PM   #6
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Vargas Turbo Tech (VTT)

Stage 1 upgrade
Manufacturers Description:
WHP Level supported (with proper fuel, upgrades, and tuning) Stock - 425WHP

Our NEW N55 Stage 1 upgrade consists of a brand new N55 turbo, custom cast and manufactured for VTT, this is coupled with a VTT custom reverse billet compressor wheel and brand new stock turbine. Stage 1 upgrade uses the stock plastic DV, but with the option to include a custom VTT / Forge DV system, or a GFB DV+ system to replace the stock plastic DV parts which are prone to cracking, and leaking. This upgrade will support 40-75 WHP over a stock turbo with stock spool and plenty of flow to redline. Turbo upgrade is a complete bolt on with no changes to water or oil lines and is undetectable by the dealership.

Stage 3 N55 "GC" DBB Cast upgrade
Manufacturers Description:
WHP Level supported (with proper fuel, upgrades, and tuning) Stock - 600WHP

Our N55 "GC" upgrade consists of 100% new castings for the entire unit. The turbine housing and manifold have been cast in two pieces with all the factory flow restrictions removed. This allows our uprgaded to support a whopping 600WHP. The highest for any drop in N55 upgrade. A GENUINE GTX3670R Garret Dual Ball bearing center section is used, coupled with VTT custom reverse wheels. The compressor is a full billet 11 blade GTX wheel, and the turbine is a Garrett style 10 blade design, these are the same turbine wheels you would find in the Garrett GT line up but made in reverse rotation. DBB stage 2 upgrade also has the option to include a GFB DV+ system to replace the stock plastic DV parts which are prone to cracking and leaking +$245 from the drop-down. This upgrade will support Stock levels-600WHP with quick spool and plenty of flow to redline. Turbo upgrade includes everything needed to install turbocharger including all water, and oil lines, and o-rings.
VTT N55 "GC" Units have no core charge

Source:
http://performance.vargasturbo.com/b...ducts/bmw-n55/
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      12-04-2018, 02:19 PM   #7
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G-Power

Manufacturers Description:
  • high performance turbocharger upgrade
  • basis: OEM turbocharger N55B30
  • power output range: 450 - 550 hp
  • enlarged exhaust gas turbine & compressor wheel
  • CNC-optimised exhaust housing
  • CNC-optimised compressor housing
  • enlarged air intake
  • intake pipe made of PU plastic
  • reduction of exhaust gas back pressure
  • CNC-optimised compressor turbine blade
  • increased air flow
  • reduction of exhaust temperature
  • optimised tolerances for max. efficiency level
  • reinforced sealing for increased boost pressure
  • high durability by reinforced shaft bearing
  • dynamic precision balancing of components

Source:
https://www.g-power.com/artikeldetai....php?details=1
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      12-04-2018, 02:19 PM   #8
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What a timely thread, thank you for doing this as I was just mulling over a swap.

In my case I thinking about going with a Dinan turbo/intercooler combo. I was wondering if it would be possible to do this on a stock tune, drive it 90 miles home and then tune it? The work would be done at a dealership and the closest Dinan one is an hour and a half away.
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      12-04-2018, 02:20 PM   #9
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Big Boost

Manufacturers Description:
What comes with the Simple kit?
– Cast exhaust manifold
– Master Power turbocharger (7-Blade billet aluminum compressor wheel)
– Wastegate mount
– Turbo to intercooler charge pipe
– BOV mount
– Turbo inlet pipe
– Big Boost down-pipe
– Custom coolant pipe
– Engine block coolant adapter
– Intercooler inlet adapter
– Oil lines

Our different stages: (Reasonable boost level)

Stage 3.1 (5459 turbo) capable of 470 whp
Stage 3.2 (5959 turbo) capable of 520 whp
Stage 3.3 (6159 turbo) capable of 620 whp
Stage 3.4 (6564 turbo) capable of 800 whp

Complete kit add-ons:
Laser Iridium NGK Colder Spark Plugs
Custom Bootmod3 DME calibration

Source:
http://bigboostusa.com/product/n55-stage-3-f-chassis-turbo-upgrade/
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      12-04-2018, 02:21 PM   #10
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Speedtech
BMW N55 STAGE 3 TURBO KIT

Manufacturers Description:
We wanted to create the ultimate daily driver turbo kit.
OEM reliability. OEM driveability.
600whp. Full boost by 3000rpm.

Cast Manifold
At the heart of the N55 kit is our ceramic coated cast manifold. Starting with a blank slate in CAD, we were able to design a manifold that will produce awesome spool, and big hp... all while keeping optimal reliability (no welded joints to fatigue crack over time).

BorgWarner EFR Turbo
BorgWarner’s EFR turbochargers set new world standards in performance, convenient installation and high-tech features:
Ultra low-mass Gamma-Ti turbine wheels
Mixed-flow turbine blade design
Dual ceramic ball bearing cartridges
Aluminum bearing housing
Stainless steel turbine housing
Flexible orientation compressor cover
Forged milled compressor wheels
Integrated high-flow wastegate, boost control solenoid valve, speed sensor and compressor recirculation valve

Options for turbos are:
7064 (up to 520whp)
7670 (up to 620whp)
8374 (up to 750whp)
9180 (up to 900whp)
Factory Fit and Finish
The kit was designed to not only make power, but also be efficient and reliable. As such, we designed for it to interact with the stock components such as the airbox/filter/tube/intercooler/exhaust. With just our kit installed, and extra fueling, we've laid down 680whp... through the above stock components. Form and function living together... and making big power.

Included In The Kit
BorgWarner EFR Turbo
Cast Exhaust Manifold (divided for twin scroll)
Stainless Steel Downpipe
RH Engine Mount
Waterpump Mount Bracket
Coolant Hoses and Fittings
Oil Lines and Fittings
Aluminum Turbo Inlet Tube
Aluminum Turbo Outlet Tube
Silicone Couplers
EWG Bracket and Linkage
Required Fasteners and Hose Clamps
V-band Clamp

Please note - kits are made to order - lead time is generally 4 to 6 weeks and depends on the availability of the BorgWarner EFR turbocharger(s).

Source:
https://www.speedtech.com/bmw-n55/
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      12-04-2018, 02:21 PM   #11
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BP-Engineering
BPE-600 Hybrid turbo

Manufacturers Description:
BMW N55 /M2/M235i
Bolt-on Installation.
Can Deliver Up To 500+Whp.
Turbo Manifold Ceramic Coated.
Upgraded Dual Ball Bearing System.
Balanless 3D Printing Techology.
CNC Polished Comperessor Housing.
110.000 RPM Dynamically Balanced.
Inconel Material Turbine Wheel.

Source:
http://www.bp-motorsport.com/?page_id=9617

Brought to you by the same manufacturer who makes this awesome carbon fiber aero kit with integrated brake cooling ducts:
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      12-04-2018, 02:22 PM   #12
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      12-04-2018, 04:49 PM   #13
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Great write up brother. Thanks for taking the time to compile all this contraband.
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      12-04-2018, 05:20 PM   #14
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F87 M2 Aw -Vorsteiner Aero Kit, VFF-107,Macht Schnell-Springs,
VF-Engineering/Hex tuning Stage Two,ER DP,Stock Exhaust,Drop-In Bmc Filter,
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      12-04-2018, 05:32 PM   #15
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Don't forget the $2500 fuel pump upgrade to take advantage of any of these.
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      12-04-2018, 06:29 PM   #16
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Subbed.

As others have said, thanks for taking the time to put this together!
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      12-04-2018, 09:13 PM   #17
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OP, thanks for taking your time doing the summary. I'll contribute wherever I see fit or I can.

There're two points that you will want to correct though -

1) The key to qualifying for a Stage 2 Hybrid turbo is the Turbine upgrade. It's what takes the exhaust momentum and drive the entire turbo assembly. Upgraded turbine must be freer flow and has less backpressure which unlocks top end power, huge.

2) TTE460 is a Stage Two turbo and an excellent one.
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      12-06-2018, 12:24 AM   #18
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Thanks! I wasn't even aware about VTT in Hayward, who are really local to me. I think I'll go check them out.
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      12-11-2018, 10:35 PM   #19
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the Steamspeed STX78R seems bad ass
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      12-14-2018, 10:18 AM   #20
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Quote:
Originally Posted by Natek View Post
the Steamspeed STX78R seems bad ass
Here's a lot more information on that one:
https://bmw.***********.com/threads/steamspeed-stx-78r-bb-n55-turbo-aka-stage-2-5-specs-details.2874/

But then you have to also take into account threads like this where Pure Turbos defends their turbo comparison:
https://www.***********.com/showthread.php?90840-A-look-at-the-SteamSpeed-Stage-2-5-STX-78R-BB-N55-turbo-upgrade-500-whp

Quote:
Originally Posted by Pure Turbos View Post
I see a lot of speculation in your thread, regarding our very popular Pure Stage 2. Let's see some true repeatable dynojet results of your Sumalaya brand Taiwan cartridge turbo, before making any claims. They pitched their BB cartridges to us April '15, we were not interested. Same brand as those n54 billet BB cartridge turbos that popped up, which had failure problems. Also, 59x78 is the size of our in house engineered PS2 compressor wheel. I surely hope your wheel profile doesn't exactly match our solidworks file created here in our facility. We will be checking on that. Also, FYI your cartridge is missing a heatshield in your pics!
Point is, do your research. I have been researching all of the turbo options for months and still haven't reached a decision. Be smart and do your homework before investing and trusting your car with one of these options.
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Charlie Nibbana
517whp PS2, XDi-35, Öhlins RT, 763m, etc.
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      12-15-2018, 01:11 AM   #21
M2OG
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Quote:
Originally Posted by nothingman View Post
Here's a lot more information on that one:
https://bmw.***********.com/threads/steamspeed-stx-78r-bb-n55-turbo-aka-stage-2-5-specs-details.2874/

But then you have to also take into account threads like this where Pure Turbos defends their turbo comparison:
https://www.***********.com/showthread.php?90840-A-look-at-the-SteamSpeed-Stage-2-5-STX-78R-BB-N55-turbo-upgrade-500-whp



Point is, do your research. I have been researching all of the turbo options for months and still haven't reached a decision. Be smart and do your homework before investing and trusting your car with one of these options.

Yeah I hear ya, I've done research to death but the internet is a black hole. At the end of the day there just aren't enough people running these to get a strong sense of how well or poorly they function relative to the competition. With that said, I personally don't care where the components come from. As with manufacturing in any country, you can get junk or really high quality stuff.

Also, full disclosure... I called Steamspeed the other day and chatted with them about this turbo. In our conversation the gentleman mentioned they're willing to machine the turbo to whatever spec I want should I desire something different. Between that flexibility and the BB center section it's hard to knock the appeal.

It does make me wonder why no one else has utilized a BB center section...
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      12-20-2018, 03:07 PM   #22
eeyang92
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I know this may be a silly question to ask, but what kind of reliability hit should one expect when pushing +100-200 HP over stock? For example, if the N55 lasts on 100k miles on average before major problems, after tuning, should I expect the lifetime of the engine to go down significantly, perhaps to 50k miles? Even less? I'm just trying to get a sense of how much damage I'll be doing to my wallet

On the other hand, if you only increase torque slightly, but allow the top end to breathe easier with a big turbo and increased fueling (preventing the torque drop off after 6k RPM) for higher top-end HP, I don't think that should effect reliability too much, right?

I see that some of the companies listed above claim "OEM reliability", but that's probably referring to the turbo only, and not the system as a whole.
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