BorgWarner S1BG T25 Turbo

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)