GTX5020R 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
• GTX5020R 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: 1075 - 2050

Displacement: 2.8L - 11.0L

GTX5020R GEN II | Reference Data Compressor Turbine
Super Core PN Replaces Inducer Exducer Trim A/R Inducer Exducer Trim
851285-5018S NEW 76mm 120mm 41 0.88 99mm 91mm 84
851285-5019S NEW 80mm 120mm 45 0.88 99mm 91mm 84
851285-5020S 804878-5024S 88mm 120mm 54 0.88 99mm 91mm 84
Notes: Turbine Kit PN A/R Inlet Outlet Wastegate Divided Trim
Super Core and Turbine Kit Sold Separately 761208-0030 0.96 T6 V-Band Free Float N 84
761208-0033 1.39 T6 V-Band Free Float N 84

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