Garrett G Series G25-550 Reverse Rotation Turbo

Garrett G Series G25-550 Reverse Rotation Turbo Packs a Big Punch for its Size

Garrett’s G25-550 is the smallest Reverse Rotation turbo in the potent G-Series lineup, but it delivers more power than competitors. A clean-slate ball bearing turbo with state-of-the-art aerodynamics, this turbo is more compact yet outflows all comparable products on the market.

The new compressor and turbine aero combined with exotic high-temperature alloys allowed engineers to outdo the Gen2 GTX and competitor turbos. Carrying nothing over from the old gen – the G-series 60mm exducer billet compressor wheel redefines what we thought was possible for a given airflow range. This turbo manages to flow +10 lbs/min (+22% gain) compared to the outgoing GTX2860R Gen II turbo it supersedes.

The reverse rotation G25-550 is an exact mirror of the standard rotation G25. Designed to improve fitment in single and twin-turbo installs, the max turbo speed is 185krpm and the max temp is 1050C/1922F. G25 Compressor housings use a traditional 3″ inlet and 2″ hose outlet with a fully machined speed sensor port. The Improved ported shroud inlet design offers maximum surge resistance with huge flow rates in a compact outline. This turbo is available in standard rotation and reverse rotation options for enthusiasts that want the perfect twin turbo installation or a single reverse rotation turbo for applications with installation restrictions. It is sold as a complete assembly with supercore and turbine housing.

Compressor Specifications

• Compressor Wheel Exducer: 60mm
• Compressor Wheel Inducer: 48mm
• Compressor Wheel Trim: 65
• Compressor Wheel Material: Forged Billet Aluminum Alloy
• Compressor Wheel A/R: 0.70 A/R
• Max Flow Rate: 50 lb/min
• Max Recommended Turbo Shaft Speed: 185000 RPM
• Compressor Housing Connections:
  • Inlet: 3.0″ Hose Coupler
  • Outlet: 2.0″ Hose Coupler

G25-550 60mm Compressor Map

Turbine Specifications

• Turbine Wheel Exducer: 49mm
• Turbine Wheel Inducer: 54mm
• Turbine Wheel Trim: 84
• Turbine Wheel Material: Mar-M
• Turbine Wheel Max Temp: 1050C / 1922F
• Housing Size and A/R ratio: G-Series G25-550 is available in five (5) different turbine housing configurations:
  • 0.49 A/R T25 Single Scroll Inlet, V-Band Outlet w/ Internal Wastegate
  • 0.72 A/R V-Band Single Scroll Inlet, V-Band Outlet
  • 0.92 A/R V-Band Single Scroll Inlet, V-Band Outlet
  • 0.72 A/R V-Band Single Scroll Inlet, V-Band Outlet w/ Internal Wastegate
  • 0.92 A/R V-Band Single Scroll Inlet, V-Band Outlet w/ Internal Wastegate

Turbine Flow Map

G25-550 Dyno Results

When installed by Tunnel Vision Turbocharging in Melbourne, Australia, on a Nissan SR20DET, the Garrett G25-550 turbo turned out the following numbers on the dyno.

Understanding the Name

A new name designates a new generation of industry-leading technology and innovation. In G25-550, the “G” designates 81 years of Garrett® Turbo heritage, the “25″ classifies the frame size, and the remaining 3 digits identify the “max horsepower” rating at the flywheel of the turbocharger (550).

G-Series Billet Compressor Wheel

Available in standard rotation and reverse rotation options for enthusiasts that want the perfect twin turbo installation or a single reverse rotation turbo for applications with installation restrictions.  The CFD (computational fluid dynamics) engineered compressor wheel increases airflow up to 15% for 60mm with 79-80% efficiency when compared to GTX Gen II.