GTX4720R GEN II – Owen Developments
Motorsport Turbochargers and Engine Management 01865 821 062
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Gen II Compressor Wheel Dimensions and Aerodynamics

GTX4709R GTX5009R Available in 76mm and 80mm inducer diameters

  • Comp exducer is now 109mm (+1mm vs Gen I)
  • Gen II wheel produces 15% more air flow
  • 39% lower inertia

GTX4720R GTX5020R Available in 76mm, 80mm, and 88mm inducer diameters

  • Comp exducer is now 120mm (+2mm vs Gen 1)
  • Gen II wheel produces 9% more air flow
  • 30% lower inertia
  • Reduced inertia due to reduction of material in the hub and blades
  • Roughly 20% lower mass
  • Lower inertia helps make boost faster and increases overall turbo efficiency
  • Increased flow has potential to make more power at same boost or same power at lower boost levels

Larger Comp Exducer on Gen II


• GEN II compressor wheel aerodynamics
• 9% increased flow
• 76mm, 80mm, 88mm inducer configurations
• Larger .88 A/R compressor housing volute
• GTX4720R features a 120mm comp exducer ( + 2 mm) and has 30% lower inertia*.
• Super core and turbine housing sold separately
• Compatible with GT and GTX turbine housings

Horsepower: 1025 - 1950

Displacement: 2.5L - 10.0L


GTX4720R GEN II | Reference Data Compressor Turbine
Super Core PN Replaces Inducer Exducer Trim A/R Inducer Exducer Trim
851285-5013S NEW 76mm 120mm 41 0.88 93mm 84mm 82
851285-5014S NEW 80mm 120mm 45 0.88 93mm 84mm 82
851285-5015S 804878-5007S 88mm 120mm 54 0.88 93mm 84mm 82
Notes: Turbine Kit PN A/R Inlet Outlet Wastegate Divided Trim
Super Core and Turbine Kit Sold Separately 761208-0009 0.96 T6 V-Band Free Float N 82
761208-0010 1.08 T6 V-Band Free Float N 82
761208-0011 1.23 T6 V-Band Free Float N 82
761208-0012 1.39 T6 V-Band Free Float N 82

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