Garrett

Garrett G-Series II G25-700 54mm Turbocharger

$2,714.39

COMPRESSOR MAP EXHAUST FLOW CHART FLANGE DIAGRAM (PDF)

ROTATION

TURBINE HOUSING

PRODUCT DETAILS

The G-Series II G25-700 54mm is part of Garrett's G-Series II line, the second generation of the G-Series. Its revised compressor wheel flows up to 10 percent more air than the first-generation G-Series at peak pressure ratio and peak shaft speed, with better efficiency at high flow. To turn that extra flow into more power, the engine needs to be recalibrated. G-Series II shares its compressor and turbine housings with the first-generation G-Series, so an existing Gen I turbo can be upgraded by replacing only the center housing rotating assembly (CHRA).

Garrett rates the G-Series II G25-700 54mm for 350 to 700 horsepower on 1.4 to 3.0 liter engines.

Key Specifications

Series — G-Series II
Frame size — 25 frame
Horsepower rating — 350–700 hp (Garrett rating)
Engine displacement — 1.4–3.0 L
Compressor wheel — 54 mm inducer, 67 mm exducer
Turbine wheel — 54 mm inducer, 49 mm exducer
Base boost, complete turbo — 7.3 psi (0.5 bar actuator)
Center housing — Oil and water cooled
Maximum turbo speed — 160,000 rpm
Supercore part number (standard rotation) — 934075-5002S
Supercore part number (reverse rotation) — 934114-5002S
CHRA part number (standard rotation) — 934074-5002S
CHRA part number (reverse rotation) — 934113-5002S
Complete turbo part number (standard rotation, 0.49 A/R) — 934076-5004S
Complete turbo part number (standard rotation, 0.72 A/R) — 934076-5005S
Complete turbo part number (standard rotation, 0.92 A/R) — 934076-5006S
Complete turbo part number (reverse rotation, 0.72 A/R) — 934115-5003S
Complete turbo part number (reverse rotation, 0.92 A/R) — 934115-5004S

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.

Garrett part number	Rotation	A/R	Inlet	Outlet	Wastegate	Divided
740902-0069	Standard	0.72	V-Band	V-Band	External	No
740902-0068	Standard	0.92	V-Band	V-Band	External	No

740902-0076	Standard	0.72	V-Band	V-Band	Internal	No
740902-0077	Standard	0.92	V-Band	V-Band	Internal	No

740902-0080	Standard	0.49	T25	V-Band	Internal	No

740902-0073	Reverse	0.72	V-Band	V-Band	External	No
740902-0074	Reverse	0.92	V-Band	V-Band	External	No

740902-0078	Reverse	0.72	V-Band	V-Band	Internal	No
740902-0079	Reverse	0.92	V-Band	V-Band	Internal	No

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 160,000 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.