Why would I buy the G25-585 Reverse Rotation Turbo?

Buy it when a twin-turbo engine needs its two turbochargers to mirror each other. The G25-585 Reverse Rotation Turbo turns the opposite way to a standard unit, with housings mirrored to match, so each bank gets the same compressor and turbine while the plumbing stays symmetrical.

Which engines suit the 0.92 A/R reverse housing?

Engines that make their power high in the rev range, or the larger end of the 1.4L to 3.0L displacement band per turbocharger. The 0.92 A/R housing trades early boost for flow, so a twin setup built for street response is usually better on the 0.72 A/R reverse version.

Does Garrett offer other reverse rotation G25-585 parts?

Yes. Garrett lists a reverse rotation G25-585 super core, a reverse rotation CHRA, and reverse rotation G25 turbine housings in 0.72 and 0.92 A/R with either internal or external wastegate. That lets a builder assemble a free-float reverse unit if the manifold uses external gates.

What is the maximum shaft speed?

Garrett publishes a maximum allowable speed of 185,000 rpm for the G25-585. Running above it is at the risk of the owner and can cause damage and early failure. The compressor housing accepts a Garrett speed sensor, sold separately, so the tuner can watch shaft speed on both turbochargers.

Is a tune needed after installation?

Yes. Garrett states that a calibration is needed to take advantage of the increased G-Series II compressor flow. On a twin-turbo engine both banks must be calibrated for the new turbochargers, and boost control should be set to keep each unit inside its compressor map.

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Description

Garrett G25-585 Reverse Rotation Turbocharger, G-Series II 0.92 A/R V-Band

Garrett’s G25-585 Reverse Rotation Turbo with the 0.92 A/R housing is the high-flow reverse rotation G-Series II G25, made for the second bank of a mirrored twin-turbo engine. It uses V-band connections at the turbine inlet and outlet and an internal wastegate that Garrett sets with a 0.5 bar actuator. Garrett rates each turbocharger at 300 to 585 horsepower on 1.4L to 3.0L engines. The larger housing suits a twin-turbo six or V engine that makes its power at high rpm; a twin setup built for low-speed response should use the 0.72 A/R version instead.

Reverse Rotation Range

Garrett builds the G25-585 in reverse rotation as a super core, a CHRA and a complete turbo, and offers reverse rotation G25 turbine housings in 0.72 and 0.92 A/R with internal or external wastegate. The reverse turbos come only with V-band inlets; the T25 inlet is a standard rotation option.

Features

Turns opposite to a standard G25-585, with mirrored compressor and turbine housings
0.92 A/R V-band internal wastegate housing for lower back pressure at high rpm
Mar-M alloy turbine wheel rated to 1050C (1922F)

Specifications

Garrett turbo reference: 4849
Compressor inducer and exducer: 48mm and 60mm
Turbine inducer and exducer: 54mm and 49mm
Turbine housing: 0.92 A/R, V-band inlet and outlet
Wastegate actuator: 0.5 bar
Maximum turbocharger speed: 185,000 rpm
Rotation: Reverse

What’s Included

G25-585 G-Series II reverse rotation turbocharger with 0.92 A/R internal wastegate housing and actuator
Oil restrictor and water fittings

Applications

The G25-585 Reverse Rotation Turbo is not vehicle specific. Garrett sizes it by engine and output:

Engine displacement: 1.4L to 3.0L
Power range: 300 to 585 horsepower per turbocharger (Garrett rating)
Layout: Mirrored twin-turbo engines

Notes

Run it alongside a standard rotation 0.92 A/R G25-585 on the opposite bank
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
A new calibration is needed before the engine can use the extra G-Series II flow

Frequently Asked Questions

Why would I buy the G25-585 Reverse Rotation Turbo? Buy it when a twin-turbo engine needs its two turbochargers to mirror each other. The G25-585 Reverse Rotation Turbo turns the opposite way to a standard unit, with housings mirrored to match, so each bank gets the same compressor and turbine while the plumbing stays symmetrical.
Which engines suit the 0.92 A/R reverse housing? Engines that make their power high in the rev range, or the larger end of the 1.4L to 3.0L displacement band per turbocharger. The 0.92 A/R housing trades early boost for flow, so a twin setup built for street response is usually better on the 0.72 A/R reverse version.
Does Garrett offer other reverse rotation G25-585 parts? Yes. Garrett lists a reverse rotation G25-585 super core, a reverse rotation CHRA, and reverse rotation G25 turbine housings in 0.72 and 0.92 A/R with either internal or external wastegate. That lets a builder assemble a free-float reverse unit if the manifold uses external gates.
What is the maximum shaft speed? Garrett publishes a maximum allowable speed of 185,000 rpm for the G25-585. Running above it is at the risk of the owner and can cause damage and early failure. The compressor housing accepts a Garrett speed sensor, sold separately, so the tuner can watch shaft speed on both turbochargers.
Is a tune needed after installation? Yes. Garrett states that a calibration is needed to take advantage of the increased G-Series II compressor flow. On a twin-turbo engine both banks must be calibrated for the new turbochargers, and boost control should be set to keep each unit inside its compressor map.

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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Shipping Policy

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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 G25-585 Reverse Rotation Turbocharger, G-Series II 0.92 A/R V-Band [934115-5002S]

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Garrett G25-585 Reverse Rotation Turbocharger, G-Series II 0.92 A/R V-Band

Reverse Rotation Range

Features

Specifications

What’s Included

Applications

Notes

Frequently Asked Questions

About Garrett

Reviews