
Garrett G25-550 Turbocharger O/V T25 / V-Band 0.49 A/R Internal WG
877895-5001S
Features
- G SERIES COMPRESSOR AERODYNAMICS FOR MAXIMUM HP
- 48mm TURBOCHARGER COMPRESSOR WHEEL
- 80% MAXIMUM COMPRESSOR EFFICIENCY
- MAR-M ALLOY TURBINE WHEEL RATED UP TO 1050° C
- NEW TURBINE AERO PROVIDES HIGHER FLOW AND EFFICIENCY
- TURBOCHARGER ASSEMBLIES ARE CALIBRATED WITH A 0.5 BAR ACTUATOR
- STAINLESS STEEL TURBINE HOUSINGS RATED UP TO 1050° C
- OIL RESTRICTOR AND WATER FITTINGS INCLUDED
- FULLY MACHINED SPEED SENSOR AND PRESSURE PORTS
G25-550
HP: 300-550 Disp: 1.4L-3.0L
Compressor Map

Exhaust Flow Chart

The most powerful small frame turbocharger on the market
Introducing performance out of a package you never thought possible. This clean sheet product is tailored to meet the demands of hard core racing enthusiasts while providing industry leading power capability in a small package.
The G-Series G25-550 turbochargers are compatible with 1.4L – 3.0L engine displacements and capable of producing up to 550 horsepower. G Series 25 turbochargers are smaller and outflow all comparable products on the market.
New compressor and turbine aero combined with high temperature resistant materials allowed engineers to push the limits of performance.
A new name designates a new generation of industry leading technology and innovation.
Understanding the Name:
G25-550 || G25-660
G designates 81 years of Garrett® heritage.
25 classifies the size of the frame. The remaining 3 digits identify the max horsepower rating of the turbocharger. (ie 550)

Compressor Aero
Forged fully-machined compressor wheel and new aerodynamics increase maximum horsepower output and boost response. The CFD (computational fluid dynamics) engineered compressor wheel increases air flow up to 15% for 60mm and 30% for 67mm with 79-80% efficiency. (Compared to GTX GenII)
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.

Speed Sensor
The compressor housing features a fully machined ported shroud to help reduce compressor surge. A fully machined speed sensor port provides enthusiasts the option to add the new G Series speed sensor to measure turbocharger shaft speed, a key factor in determining ideal operating conditions.
The new speed sensor is easy to install and does not need to be adjusted for length like previous sensors. Simply remove and plug, then insert the speed sensor and tighten the bolt. The new speed sensor is sold separately and is not compatible with GT and GTX sensors due to the new design and sizing.
The addition of an o-ring between the compressor housing and backplate reduces the possibility of boost pressure leakage.

Center Housing
A new one-piece center housing and backplate increase durability and product safety by reducing the number of failure points associated with the turbocharger. The center housing to turbine housing v-band connection allows for 360 degree orientation when installing with Garrett® non-wastegated turbine housing