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BorgWarner S1BG T25 Turbo

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BorgWarner S1BG T25 Internal WG Turbocharger (313295)

The S1BG is a high end journal bearing T25 turbo with Internal-WG that supports 70-280hp. Available with 2 turbine wheel sizes and 3 compressor wheels – depending on engine displacement, boost and power targets. Oil-Cooled Journal Bearing only.

Note: Part #313798 has 0.81 A/R Turbine Housing

Compressor Specifications

  • Compressor Type: Extended Tip
  • Compressor Wheel OD (exducer): 48.31mm, 52.91mm, or 57.96mm
  • Compressor Wheel Inducer: 34.21mm, 39.32mm, or 43.28mm
  • Max Flow Rate: 30 lb/min
  • Compressor Housing Connections:
    • Inlet: 2.375″ Hose Coupler
    • Outlet: 2.0″ Hose Coupler

Turbine Specifications

  • Turbine Type: Inconel S1 Turbine Wheel
  • Turbine Wheel OD: 46.99mm or 52.92mm
  • Housing Material: D5S sandcast
  • WG bracket orientation independent from compressor and turbine clocking


Housing Size and A/R Ratio: S1BG is available in four (4) different turbine housing configurations:

  • 0.35 A/R T25
  • 0.46 A/R T25
  • 0.61 A/R T25
  • 0.81 A/R T25

Turbine outlet: twin 5 bolt (aka 6bolt)

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Product NameBorgWarner S1BG T25 Turbo
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