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BorgWarner EFR 6258 Turbo

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 Product Description

The EFR Series combines the engineering prowess of the turbocharger market leader, BorgWarner, with the most advanced race grade technology available. Using high-end composite materials, BorgWarner has created a turbocharger which has almost eliminated spooling lag, while maintaining massive power gains. If you are looking to unleash the full potential of your vehicle, there is no better choice than the EFR series. The modern standard in turbochargers, nothing can beat the combination of performance, features, and form factor.

The 6258 is the smallest and fastest spooling EFR turbocharger in the EFR lineup. It’s small size results in the best possible turbo response time, making this an excellent choice for autocross, rally, drift, road racing and street applications. The 62mm OD compressor has a 49.6mm inducer rated at 44lb/min max flow - supporting up to 450hp

The compressor wheel is highly versatile with extremely large map width for outstanding power potential, even at high boost. The low inertia 58mm Gamma-Ti turbine wheel is optimally matched for maximum response and fast spool with the FMW compressor wheel. EFR 6258 uses the smallest-sized compressor housing, making fitment in even the most cramped engine bays a breeze.

Compressor Specifications

  • Compressor Type: Forged-Milled Wheel (FMW) Extended Tip
  • Compressor Wheel OD (exducer): 62mm
  • Compressor Wheel Inducer: 49.6mm
  • Max Flow Rate: 44 lb/min
  • Built-in BOV: All EFR compressor housings incorporate an integrated BOV.
  • Compressor Housing: 2.5" inlet, 2.0" hose coupler outlet.

Turbine Specifications

  • Turbine type: Low Inertia Gamma-Ti Turbine Wheel
  • Turbine Wheel OD: 58mm (recommended) OR 55mm
  • Stainless Steel Cast Housing
  • Turbine outlet: GT-Vband (aka small 3" vband) ~92mm OD for all EFR turbos

Product Features Include

  • 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.  Less drag than standard ball bearing turbos.
  • 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 electronic 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.  V-band connections allow turbo to be easily clocked.
  • 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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