Garrett G-Series Turbochargers - The Most Powerful Small Frame Turbos on the Market



The G-Series G25-550 and the G25-660 turbochargers are compatible with 1.4L - 3.0L engine displacements and capable of producing up to 550 and 660 horsepower. G Series 25  turbochargers are smaller and outflow all comparable products on the market. These "clean sheet" products are tailored to meet the demands of hard core racing enthusiasts while providing industry leading power capability in a small package.

Understanding the Name: G25-550

G G designates 81 years of Garrett® heritage
25 25 classifies the size of the frame
550 The remaining 3 digits identify the max horsepower rating of the turbocharger


New compressor and turbine aero combined with high temperature resistant materials have allowed engineers to push the limits of performance. Let's take a closer look at the features of the new G-Series turbochargers.



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) The compressor housing features a fully machined ported shroud to help reduce compressor surge. The addition of an o-ring between the compressor housing and backplate reduces the possibility of boost pressure leakage.


Wide compressor maps indicate a larger operating range to support a variety of vehicle setups.


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.


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 housings.


Water Jackets

Four large water jacket ports increase cooling capacity and allow enthusiasts to customize water line routing to help improve the installation process.  The turbocharger comes with two -6AN water fittings and two plugs. *Recommended to install waterlines on opposite sides of the housing.


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