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BorgWarner EFR 8374 Turbocharger
BorgWarner EFR 8374 Turbocharger
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8374 EFR Turbo

475-750 HP Power Rating

62.6mm Compressor Wheel/ 74mm Turbine Wheel

The EFR 8374 is one of the larger sized turbochargers in BorgWarner's ultra-efficient EFR lineup. The 83mm OD compressor has a 62.6mm inducer at 79lb/min max flow - supporting up to 750hp with a very large map width for outstanding power potential, even at high boost. The 8374 is an ideal single turbo for the majority of moderately modified diesels.  Water Cooling is highly recommended.

What makes the EFR Turbo so special?
BorgWarner did their research when they designed this turbocharger design. The EFR turbo is not one great technology but many put together in one package.
  • Gamma-Ti Turbine wheel: BorgWarner says that the EFR's turbine wheel is "the most exciting technology"of the EFR system. BorgWarner chose to use a newer exotic metal for the Turbine wheel, it is called Titanium Aluminide(Gamma-Ti), and it is very trick. This metal is a compound that mixes the best qualities of both metals and gives the wheel higher temperature capabilities over either metal alone. On top of that, it is much stronger than aluminum. Another big point is that it is about 1/2 the weight of a normal turbine wheel, this really reduces the inertia which is very noticeable on wheels larger than 64mm.

  • Ball Bearing: The next most talked about part of the EFR system is BorgWarner's new advanced ceramic Ball Bearing cartridge system. They designed the new cartridge system to be superior to all other ball bearing systems and journal bearings. It is well known that when a turbo is at the top end, there is very little difference between a journal bearing and ball bearing turbo, but the ball bearing will get you to the max much faster. With the EFR turbo, you will feel the much more instant turbo spool feel. One other great features of this cartridge design is if you do have a failure, the cartridge holds the oil so you can get home even if you blew your turbo. If you are using it for a work truck that might be doing hundreds of miles in a day, this might be an indispensable feature. Additional Image of the Bearing System:

  • Turbine Housing: The housing is not just there to look pretty, BorgWarner has designed it to be functional first. They used a 300 series stainless steel to make it extra resistant to heat and corrosion. The casting process is investment casting which yields a like machine finish on the inside and out, reducing gas friction losses on the inside and causing envy by anyone who looks at your engine bay. The Turbine housing can be polished or left as is. After heat cycling, it has a nice finished color without polishing.
  • Additional Image of the Turbine Housing:

  • Integrating the BOV and Wastegate for maximum efficiency: BorgWarner does not understand why people want to overcomplicate their turbo charging system by adding an external blow off valve, boost control solenoid and wastegate. Not only does it add cost but it also requires additional packaging requirements that a lot of engine bays can't support, this is why the EFR turbo has all of these already incorporated into the design. The CRV (compressor recirculation valve) vents the boost quickly back into the system instead of wasting it in the atmosphere and keeping the turbo speed high. The Boost Control Solenoid Valve (BCSV) will easily allow you to dial in the boost you want, instead of using an aftermarket solution.

Diesel and EFR Turbos

The EFR turbo is a very versatile turbo as you might have got by reading so far. This is why we chose to use it on our race truck for the Baja 1000. These turbos are completely different than the normal single or twin setups found on modern diesel trucks. The EFR is much more raw and mean. What we mean by this is that 20 lbs of boost on a triple EFR setup feels more aggressive in our Ram 3500 than our previous 909 horsepower twin setup that was running 70-100lbs of boost. How is this possible, you may ask? Well, it is rather simple, the EFR turbos are much more modern as you saw in the Why EFR tab, the EFR spools up to 2x faster and simply gives you much more power all the time. Instead of spooling a huge turbo in a big twin system, all that energy/power is instantly going to your wheels. So with the EFR, you have 4 decisions to make: Single, parallel twins, parallel triple turbos, or mixed/other.  For the majority of our customers we would probably recommend a Parallel twin setup for the best benefits with a lower cost of build than a triple setup.

Our Recommended Setups

Single Turbo:

The single turbo system is the simplest option for anyone looking for more power to upgrade from a stock or other non-EFR turbo. For a diesel truck we have three recommended turbos that should fit most customers needs.

BorgWarner Turbo 
EFR 7670
EFR 8374
EFR 9180
Recommended Power Rating
375-600 HP
475-750 HP
600-1000 HP
Recommended Use
Perfect for improved responsiveness, fuel economy and towing use.
Great for a street/ Drag Strip truck.
This is a drag strip turbo, it will not be a great daily driver due to its turbo lag.
Required Modifications
•Mild Programmer
•40HP Nozzles
•Wild Programmer
•90 HP Injectors
•Wild Programmer
•125 HP Injectors
MAX Turbo Pressure
 35-40 PSI
 35-45 PSI
 40-50 PSI

Triple Turbos(Parallel):

The Parallel triple setup is our favorite way to use the EFR turbos. Using 3 6258's on our Baja 1000 truck, we have had the most fun we have ever had in a diesel truck. This system is the best of all worlds, because we are using small frame turbos, they spool up almost instantly, and because we are using 3, we have a maximum power rating of around 1200 HP! At 20lbs of boost, the truck seemed much more violent and powerful than the previous 909 HP twin setup. They also sound unlike anything we have ever heard before, the sound is like a small pack of squirrels are caught inside the turbos screaming to get out.

We have two recommendations for a Triple setup:

BorgWarner Turbo 
EFR 6255
EFR 6258
Recommended Power Rating
200-350 HP Per Turbo
~ 600-1050 HP Combined
225-450 HP Per Turbo
~ 675-1350 HP Combined

Recommended Use
Great for a street/ Drag Strip truck.
Great for a street/ Drag Strip truck.
Required Modifications
•Wild Programmer
•90+ Injectors
•Wild Programmer
•90+ HP Injectors
MAX Turbo Pressure
35-40 PSI
35-40 PSI

Mixed/Other Setups(Sequential Twins): You can also use a single EFR turbo with a big secondary turbo to gain the quick spooling characteristics of the EFR.  This is another area in which we have not tested any trucks with yet, so we cannot currently recommend this system. Without testing we would recommend currently either the EFR 7670 or EFR 8374 as a solid primary turbo. We would recommend using BorgWarner's AirWerks S400 frame turbo for the big turbo in the system. When we try one of these out, we will update this with new information and recommendations.

Compressor Specifications:
  • Compressor Type: Forged-Milled Wheel (FMW) Extended Tip
  • Compressor Wheel OD (exducer): 83mm
  • Compressor Wheel Inducer: 62.6mm
  • Max Flow Rate: 79 lb/min
  • Built-in BOV: All EFR compressor housings incorporate an integrated BOV.
  • Compressor Housing: 4.0" inlet, 2.5" hose coupler outlet.

Turbine Specifications:

  • Turbine type: Low Inertia Gamma-Ti Turbine Wheel
  • Turbine Wheel OD: 74mm
  • Stainless Steel Investment Cast Housing
  • We offer the EFR 8374 in the following housing configurations:
    • 0.83 A/R T3 undivided (Internal WG)
  • Turbine outlet: GT-Vband (aka small 3" vband) ~92mm OD for all EFR turbos

Technical Illustrations

Compressor Map
Top Angle
Front Angle
Side Angle
  • Dual Row Ceramic Ball Bearings - lowest friction and fastest spool/response, most extreme durability, built-in oil control orifice - (aka oil restrictor) **no restrictor can be used with EFR turbos
  • Watercooled Center Section - watercooling is recommended, 14mm banjo bolts
  • Double seals on both turbine and compressor end for extreme durability and resistance to any oil seepage
  • Boost Control Solenoid Valve Integrated to Compressor Housing
  • Integrated Speed Sensor mounting provisions
  • Gamma-Ti turbine wheel
  • Dual ceramic ball bearing assembly with metal cage
  • Forged milled extended tip compressor wheel
  • Stainless steel turbine housing
  • Water cooled bearing housing
  • Large internal wastegate
  • Compressor recirculation valve (a.k.a BOV)
  • Boost control solenoid valve
  • Standard T3 mounting flange
    The following accessories are not included with turbo assemblies, but highly recommended:
    • Speed sensor
    • Turbine outlet V-Band
    • Turbine inlet gasket
    • Oil drain gasket or drain port fitting
    Speed Sensor Kit
    Part Number 179430
    (1) Speed sensor, frequency output
    (1) Speed sensor hold-down bolt
    ***Note: Speed Sensor signal conversion and display accessories
    can be purchased through us. Road Rage Gages is the manufacturer.

    Hardware/Installation Kit
    Part Number 179423
    (1) Turbine housing outlet V-band clamp
    (2) V-band clamp nuts
    (2) Water port plugs
    (6) Water port plug sealing washers
    (2) Oil drain flange gaskets
    (1) Oil inlet fitting (-4an) w/seal and washer
    (1) Compressor cover outlet V-band clamp for 83 & 91mm
    (5) Clamp plate bolts
    (1) Turbine inlet gasket for T25 flange
    (1) Turbine inlet gasket for T3 flange
    (1) Turbine inlet gasket for T4 divided flange

    Compressor Recirculation Valve Kit (Turbo comes with CRV, but does not include the block-off plate)
    Part Number 179424
    (1) CRV plastic cover w/hose nipple
    (1) CRV disabling block-off plate
    (1) CRV diaphragm/piston assembly
    (1) CRV spring
    (3) Cover plate bolts w/locking compound

    Boost Control Solenoid Valve (BCSV) Kit (Turbo comes with BCSV)
    Part Number 179425
    (1) Boost control solenoid valve
    (2) BCSV screws
    (4) Hose clamps
    (1) Compressor cover boost port fitting
    (1) Comp cover boost port washer
    (1) Wastegate signal hose, 110mm
    (1) Wastegate signal hose, 410mm

    Wastegate Hose Kit
    Part Number 179426
    (1) Wastegate signal hose, 410mm
    (2) Hose clamps

    AEM Tru-Boost Gauge Type Boost Controller
    Part Number AEM-30-4350

    AEM's TRU-BOOST Gauge-Type Controller is an electronic boost controller that combines the simplicity of a manual boost controller with the added ease of adjusting boost levels through a gauge interface. There is no external interface required for set up, and it is fully functional right out of the box. 

    BorgWarner EFR Technical Training Guide

    If you want to know nearly everything about the new EFR Turbos, this is a great place to start. This training guide was developed by BorgWarner for its distributors. We feel it is so informative, that we want to share it with our customers so they can understand even better how amazing these turbos are. Click the PDF icon to the right to download the guide.

    Inside look at the EFR TurboCharger

    This is a comprehensive illustration of the EFR turbo and its inner workings.

    Technical Illustrations

    Compressor Map
    Top Angle
    Front Angle
    Side Angle

    BorgWarner's Promotional Video for the EFR Series Turbochargers.

    Product SKU Description Price Order
    BorgWarner EFR 8374 Turbocharger BW-8374-179258T
    This turbo is NOT vehicle specific!  Thus, you will have to make provisions for installing it into your particular application.  We are working on building kits to make the EFR's vehicle specific.  If you have any questions regarding what would be involved, please do not hesitate to contact us.
    DPP Price: $2,414.96 

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