Garrett G-Series G57-2550 98mm Turbocharger

The G-Series G57-2550 98mm is one of Garrett's largest G-Series turbos. It uses a 16mm dual ceramic ball bearing cartridge in a one-piece aluminum center housing and is outline-interchangeable with GTX Gen II turbos. Garrett recommends 40 to 45 psi of oil pressure at maximum engine speed. Stainless steel turbine housings are sold separately as the variants below.

Garrett rates the G-Series G57-2550 98mm for 1,400 to 2,550 horsepower on 3.0 to 12.0 liter engines.

Key Specifications

• Series — G-Series
• Frame size — 57 frame
• Horsepower rating — 1,400–2,550 hp (Garrett rating)
• Engine displacement — 3.0–12.0 L
• Compressor wheel — 98 mm inducer, 133 mm exducer, 0.96 A/R housing
• Turbine wheel — 118 mm inducer, 112 mm exducer, 90 trim
• Bearing — Dual ceramic ball bearing (16mm cartridge)
• Maximum turbo speed — 84,000 rpm
• Supercore part number — 880547-5033S

Turbine Housing Options

Each turbine housing is listed by A/R (area-to-radius ratio), inlet flange, outlet and wastegate type. "Internal" housings have a built-in wastegate; "External" housings are free-float designs that require an external wastegate.

Important Information

Garrett calculates its horsepower ratings from the compressor map choke flow, which represents the potential flywheel horsepower of the turbo. Actual results depend on the engine, supporting modifications and calibration.

Garrett sets the maximum allowable speed for this turbo at 84,000 rpm. Operating above that speed can damage the turbo and cause premature failure. A turbo speed sensor (sold separately) lets you monitor shaft speed.

For race vehicles only. Not for use on public roads.

Installation and Tuning Available at Race Protocol

Turbo system design, installation and dyno tuning are available in house. Call (724) 732-8948 to discuss your build.