Turbo Comparison - Borg-Warner EFR 7670 vs Borg-Warner SX200

This week Adam looks at the comparison between the Borg-Warner EFR 7670 vs the Borg-Warner SX200. Giving an insight into what makes each turbocharger different and the pro and cons of using each in your set up.
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BORG WARNER EFR 7670
https://enhanceyourcar.co.uk/product/borg-warner-efr-7670/

Low Inertia Turbine Wheel
Gamma-Ti turbine wheel cuts turbine inertia by roughly 50% dramatically improving turbo response. Turbine sizes range from 55 to 80mm in exducer diameter.

Heat Resistant Turbine Housings
Investment cast stainless steel turbine housings improve durability and offer an offer extremely smooth internal flow channel. Turbine housings have thin walls to reduce weight and thermal inertia.

High Turbine Efficiency
Superback” and “Fullback” back-disk shapes offer very high efficiencies. The Superback shape adds a curved profile to the back-disk and has the effect of lowering centrifugal stress and permitting higher rotational speeds.

Enhanced Turbo Response
EFR turbochargers use a dual-row ball bearing cartridge with ceramic balls and metal cage. This bearing system provides substantial friction reduction at low turbo speeds and in the process helps improve turbo response. Metal cage improved the durability of the ball bearing assembly

Flexible Compressor Cover
The EFR turbo “large” cover has a dual-machined outlet, both for a hose connection and a v-band connection.

Simplified Installation
Integrated compressor recirculation valve (CRV) to help avoid compressor surge and backflow during a throttle lift event. This feature helps to simplify the installation task and lowers overall system install cost.

Forged Milled Compressor Wheels (FMW)
EFR turbos contain wheels that are fully milled from forged aluminum, commonly known as “billet”. Cut from custom forgings, their strength exceeds that which is available from typical bar-stock and also exceeds the material properties of an aluminum casting

Sensor Mounting Convenience
Speed sensor mounting provisions are also supplied on every compressor cover. Speed sensors are sold separately.

Boost Control Solenoid Valve (BCSV)
A boost control solenoid valve (BCSV) is included with every EFR turbo.

High Flow Wastegates
Purpose designed large wastegate ports give the wastegated EFR turbos the capability of handling the flow requirements of high performance applications.

Ease of Orientation
Turbo orientation flexibility is facilitated by the wastegate bracket to bearing housing mounting arrangement.

Adjustable Wastegate
The fabrication and installation task is simplified with wastegated EFR models that feature adjustable wastegates available in three different canister sizes.

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BORGWARNER AIRWERKS S257SX-E TURBOCHARGER
https://enhanceyourcar.co.uk/product/borgwarner-airwerks-s257sx-e-turbocharger/

BW PART NUMBER 12709095003
Original BorgWarner AirWerks Turbocharger
The BorgWarner SX-E turbochargers are a combination of the attractively priced AirWerks turbochargers and the high technology of the EFR turbochargers. The most important key feature of the EFR series is the forged and milled compressor wheel in a special design with the perfectly tuned high-flow intake channels. This was adopted into the AirWerks turbochargers to create a perfect response and an optimal boost pressure build-up as with the EFR turbochargers. However, the basics of the AirWerks series are retained, so that the turbo still has a cast turbine housing and a robust (overhaulable) plain bearing. Also the passing for the speed sensor was taken over to reach the optimal efficiency of the charger.
All SX-E turbochargers come with a mounting kit for an exhaust gas housing and are prepared for a compressed air connection in the compressor housing.

SX-E Highlights:
– Good response thanks to the latest compressor wheel geometry (EFR technology)
– High flow / anti-surge intake (EFR technology)
– Robust, repairable plain bearing
– Preparation for speed sensor
– Preparation for pressure connection
– Included mounting kit for exhaust housing

Power range: 300 – 550PS
Compressor housing: Intake 89mm / discharge 51mm
Compressor wheel: Inlet 52,17mm / Outlet 69,60mm
Exhaust housing: Exhaust housing from S200SX fit
Turbine wheel: Outlet diameter 69,56mm / Inlet diameter 61,43mm

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