Does the PowerMax GT3788VA Turbo fit a 2003 F-250?

No. Garrett lists this part, 772441-5002S, for the 2004-2007 F-250, F-350 and Excursion with the 6.0L Power Stroke. A 2003 truck takes the PowerMax GT3788VA Turbo under part 777469-5002S. Garrett publishes the same wheel sizes and rating for both, so the model year decides the part.

How much horsepower is it rated for?

Garrett estimates 560 horsepower, worked out from the choke flow of the compressor map as potential flywheel horsepower. That is turbo capability rather than a dyno result, and Garrett states that results depend highly on the modifications and tuning of the vehicle.

What are the compressor and turbine sizes?

Garrett lists a 64mm compressor inducer and 88mm exducer, 52 trim, in a 0.58 A/R housing, and a 73mm turbine inducer with 66mm exducer, 84 trim, at 0.90 A/R. The compressor wheel is larger than stock, which Garrett says extends the power range while keeping turbo speed down.

Can I use it as a stock replacement?

Yes. Garrett presents the GT3788VA as outline interchangeable with the original turbo, and on an untuned truck it works as a replacement with more compressor capacity. Getting more power from it takes a calibration and a fuel system able to support the target.

How are the vanes controlled?

By Garrett patented integral electro-hydraulic actuation with a proportional solenoid, which gives infinitely variable control of the nine movable vanes. Garrett credits the system with significantly higher turbine efficiency and better engine performance from idle launch through peak torque, the range a working truck spends most of its time in.

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Description

Garrett PowerMax GT3788VA Turbo for 2004-2007 Ford F-250, F-350 and Excursion 6.0L Power Stroke

Garrett’s PowerMax GT3788VA Turbo for the 2004-2007 Ford F-250, F-350 and Excursion 6.0L Power Stroke is Garrett’s Stage 1 AVNT upgrade for the later 6.0L trucks. A compressor wheel larger than stock lifts the power range to a choke-flow rating of 560 horsepower while running the turbo slower at any given output. For a 6.0L owner who tows or tunes and wants a turbo with more margin than the original, it is the straightforward choice. It is not listed for 2003 trucks, which have their own part number.

Design

The turbine side uses Garrett’s patented Advanced Variable Nozzle Turbine: nine movable vanes driven by integral electro-hydraulic actuation and a proportional solenoid, giving infinitely variable control. Garrett says the design significantly increases turbine efficiency and improves performance from idle launch through peak torque. The unit is outline interchangeable with the factory turbo.

Features

Advanced Variable Nozzle Turbine with nine movable vanes
Patented electro-hydraulic actuation and proportional solenoid
Compressor wheel larger than the factory wheel
Outline interchangeable with the original turbocharger

Specifications

Garrett turbo model: GT3788VA
Compressor inducer and exducer: 64mm and 88mm
Compressor trim and A/R: 52 trim, 0.58 A/R
Turbine inducer and exducer: 73mm and 66mm
Turbine trim and A/R: 84 trim, 0.90 A/R
Garrett power rating: 560 horsepower

Applications

Garrett lists the PowerMax GT3788VA Turbo for these 2004-2007 vehicles:

Ford Excursion: 2004-2007 | 6.0L Power Stroke
Ford F-250: 2004-2007 | 6.0L Power Stroke
Ford F-350: 2004-2007 | 6.0L Power Stroke

Notes

For 2003 trucks, choose the 2003 6.0L PowerMax turbo
Garrett estimates 560 horsepower from the choke flow of the compressor map; results depend on modifications and calibration
Garrett publishes speed sensor kit instructions for the 6.0L turbo; see Garrett speed sensor kits

Frequently Asked Questions

Does the PowerMax GT3788VA Turbo fit a 2003 F-250? No. Garrett lists this part, 772441-5002S, for the 2004-2007 F-250, F-350 and Excursion with the 6.0L Power Stroke. A 2003 truck takes the PowerMax GT3788VA Turbo under part 777469-5002S. Garrett publishes the same wheel sizes and rating for both, so the model year decides the part.
How much horsepower is it rated for? Garrett estimates 560 horsepower, worked out from the choke flow of the compressor map as potential flywheel horsepower. That is turbo capability rather than a dyno result, and Garrett states that results depend highly on the modifications and tuning of the vehicle.
What are the compressor and turbine sizes? Garrett lists a 64mm compressor inducer and 88mm exducer, 52 trim, in a 0.58 A/R housing, and a 73mm turbine inducer with 66mm exducer, 84 trim, at 0.90 A/R. The compressor wheel is larger than stock, which Garrett says extends the power range while keeping turbo speed down.
Can I use it as a stock replacement? Yes. Garrett presents the GT3788VA as outline interchangeable with the original turbo, and on an untuned truck it works as a replacement with more compressor capacity. Getting more power from it takes a calibration and a fuel system able to support the target.
How are the vanes controlled? By Garrett patented integral electro-hydraulic actuation with a proportional solenoid, which gives infinitely variable control of the nine movable vanes. Garrett credits the system with significantly higher turbine efficiency and better engine performance from idle launch through peak torque, the range a working truck spends most of its time in.

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.

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Shipping Policy

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BP Pricing Difference

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Garrett PowerMax GT3788VA Turbo for 2004-2007 Ford F-250, F-350 and Excursion 6.0L Power Stroke [772441-5002S]

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Garrett PowerMax GT3788VA Turbo for 2004-2007 Ford F-250, F-350 and Excursion 6.0L Power Stroke

Design

Features

Specifications

Applications

Notes

Frequently Asked Questions

About Garrett

Reviews