Do I need the G25-550 Reverse Rotation Turbocharger?

Yes, if the engine runs two turbochargers that mirror each other, one in standard rotation and one in reverse. The G25-550 Reverse Rotation Turbocharger has mirrored housings and wheels that turn the opposite way to the standard unit. A single-turbo engine should use a standard rotation G25-550, which Garrett offers in three housing sizes.

How much horsepower is the G25-550 rated for?

Garrett rates the G25-550 at 300 to 550 horsepower on engines from 1.4L to 3.0L. Garrett calculates that figure from the choke flow of the compressor map, so it describes potential flywheel horsepower for one turbocharger. Fuel, boost, intercooling and the calibration set the real number on a given engine.

Is the wastegate actuator set up from the factory?

Yes. Garrett assembles this turbocharger and calibrates the internal wastegate with a 0.5 bar actuator before it ships. The owner still needs to plan boost control, oil and water lines and a V-band manifold flange, and the engine calibration must be revised for the new turbocharger.

Should I pick the 0.72 or 0.92 A/R reverse rotation housing?

Pick by displacement and rpm range. The 0.72 A/R housing on this part number builds boost sooner and suits most engines in the lower and middle part of the rated range. The 0.92 A/R version flows more at high rpm and favors larger or higher revving engines where top-end power is the goal.

Can this turbo be upgraded to G-Series II later?

Yes. Garrett states that G-Series II reuses the first-generation compressor and turbine housings, and it describes a G25-550 to G25-585 move as a like-for-like CHRA swap. Garrett lists a reverse rotation G25-585 CHRA, so the housings on this turbocharger can stay in place.

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Description

Garrett G25-550 Reverse Rotation Turbocharger, 0.72 A/R V-Band

Garrett’s G25-550 Reverse Rotation Turbocharger is the mirror-image build of Garrett’s first-generation G25, made for the second turbocharger on a twin-turbo engine where the two units face each other. It pairs a 48mm compressor wheel with a Mar-M turbine wheel inside a stainless steel 0.72 A/R turbine housing that has V-band connections at both ends and an internal wastegate, set up at the factory with a calibrated 0.5 bar actuator. Garrett rates the model at 300 to 550 horsepower on engines from 1.4L to 3.0L. On a single-turbo engine this is the wrong part, and the standard rotation G25-550 is the one to buy.

Construction

Garrett’s first-generation G-Series compressor aerodynamics give the 48mm wheel a maximum compressor efficiency of 80 percent. The turbine wheel is Mar-M alloy and the turbine housing is stainless steel, both rated by Garrett to 1050C (1922F), and the center section carries fully machined speed sensor and pressure ports.

Features

Reverse rotation, with mirrored housings and wheels that spin opposite to a standard G25-550
Internal wastegate with a factory-calibrated 0.5 bar actuator, so no external gate is needed
V-band turbine inlet and outlet that can be clocked to suit the manifold and downpipe

Specifications

Compressor inducer and exducer: 48mm and 60mm
Compressor trim and A/R: 65 and 0.70
Turbine inducer and exducer: 54mm and 49mm
Turbine housing: 0.72 A/R stainless steel, V-band inlet and outlet
Wastegate actuator: 0.5 bar
Maximum turbocharger speed: 185,000 rpm
Rotation: Reverse

What’s Included

G25-550 reverse rotation turbocharger with internal wastegate housing and actuator
Oil restrictor and water fittings

Applications

The G25-550 Reverse Rotation Turbocharger is not vehicle specific. Garrett sizes it by engine and output:

Engine displacement: 1.4L to 3.0L
Power range: 300 to 550 horsepower (Garrett rating)
Layout: Twin-turbo engines that need one standard and one reverse rotation unit

Notes

Reverse rotation build; Garrett lists separate turbine housings and super cores for each rotation
Garrett also offers this reverse rotation turbo with a 0.92 A/R housing, and the full G25-550 range in standard rotation
The Garrett speed sensor kit is sold separately
Garrett states that running above 185,000 rpm is at the owner’s risk and can cause damage and premature failure

Frequently Asked Questions

Do I need the G25-550 Reverse Rotation Turbocharger? Yes, if the engine runs two turbochargers that mirror each other, one in standard rotation and one in reverse. The G25-550 Reverse Rotation Turbocharger has mirrored housings and wheels that turn the opposite way to the standard unit. A single-turbo engine should use a standard rotation G25-550, which Garrett offers in three housing sizes.
How much horsepower is the G25-550 rated for? Garrett rates the G25-550 at 300 to 550 horsepower on engines from 1.4L to 3.0L. Garrett calculates that figure from the choke flow of the compressor map, so it describes potential flywheel horsepower for one turbocharger. Fuel, boost, intercooling and the calibration set the real number on a given engine.
Is the wastegate actuator set up from the factory? Yes. Garrett assembles this turbocharger and calibrates the internal wastegate with a 0.5 bar actuator before it ships. The owner still needs to plan boost control, oil and water lines and a V-band manifold flange, and the engine calibration must be revised for the new turbocharger.
Should I pick the 0.72 or 0.92 A/R reverse rotation housing? Pick by displacement and rpm range. The 0.72 A/R housing on this part number builds boost sooner and suits most engines in the lower and middle part of the rated range. The 0.92 A/R version flows more at high rpm and favors larger or higher revving engines where top-end power is the goal.
Can this turbo be upgraded to G-Series II later? Yes. Garrett states that G-Series II reuses the first-generation compressor and turbine housings, and it describes a G25-550 to G25-585 move as a like-for-like CHRA swap. Garrett lists a reverse rotation G25-585 CHRA, so the housings on this turbocharger can stay in place.

About Garrett

Garrett Motion has turbocharged engines since 1955, when its T15 was matched to the Caterpillar D9 crawler, and in 1962 a Garrett turbocharger went into the Oldsmobile Jetfire Turbo Rocket, the first turbocharged production car. Garrett has supplied turbocharging in Formula 1 with Scuderia Ferrari, the FIA World Rally Championship and the 24 Hours of Le Mans. It has operated as a stand-alone company since 2018, and its technology is fitted to around 150 million vehicles worldwide.

Additional Information

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BP Pricing Difference

We do pricing a little differently on our JDM brands and we believe in making things simple and clear. No hidden fees or surcharges. Every price you see includes the shipping cost to our office in Los Angeles, California and all the associated taxes/duties/fees for bringing the products into the US. The only shipping you ever pay is from our facility in the US to your location. Be wary of resellers that don’t include the cost of international shipping in their pricing on JDM parts. While we believe we’ll always have the lowest all-in price on JDM products, we offer a price match guarantee for all authentic parts purchased from authorized dealers as well. For many international customers, it’s much more affordable to ship from the USA than from Japan directly, as the air freight and ocean freight costs are typically much less. However, for customers looking to ship directly from Japan outside of North America, or domestically in Japan, we can provide pricing specifically for that scenario. Please do not hesitate to contact us with any pricing questions or concerns. Please email us at sales@bulletproofautomotive.com with any inquiries.

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Garrett G25-550 Reverse Rotation Turbocharger, 0.72 A/R V-Band [877895-5007S]

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Garrett G25-550 Reverse Rotation Turbocharger, 0.72 A/R V-Band

Construction

Features

Specifications

What’s Included

Applications

Notes

Frequently Asked Questions

About Garrett

Reviews