Will the PowerMax GT3788V Turbo fit my LML?

Yes, if the truck is a 2011-2016 Chevrolet or GMC 2500HD or 3500HD with the 6.6L Duramax LML. Garrett lists the PowerMax GT3788V Turbo for that engine as a direct drop-in that is outline interchangeable with the factory turbo. Earlier and later Duramax engines need different parts.

How much horsepower will it support?

Garrett estimates 600 horsepower, calculated strictly from the choke flow of the compressor map and representing potential flywheel horsepower. It is a turbo capability figure rather than a measured result, and an LML reaches what its fueling, exhaust and calibration allow, which is why the tune matters as much as the hardware.

Will it spool faster than the stock turbo?

Garrett does not claim that. It states that boost response of this PowerMax compared to the factory turbo has not been tested. The published claims are 19 percent more flow and better efficiency from the forged, fully machined compressor wheel.

If the aim is power, plan one. Garrett ties the result to the modifications and the calibration of each truck, and an LML left on factory software will hold its stock boost and fuel targets. In that state the 19 percent flow increase sits unused, and the turbo simply replaces the original.

Is any fabrication needed?

No. Garrett describes the turbo as a direct drop-in that maintains the original installation specifications and is outline interchangeable with the factory hardware. It goes into the stock location using the existing mounting arrangement, so the job is the same as replacing a factory turbo of the same type.

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Description

Garrett PowerMax GT3788V Turbo for 2011-2016 Chevrolet and GMC 6.6L Duramax LML

Garrett’s PowerMax GT3788V Turbo for the 2011-2016 Chevrolet and GMC 2500HD and 3500HD 6.6L Duramax LML is a direct drop-in Stage 1 upgrade that keeps the factory installation. Garrett states 19 percent more flow than the original turbo and estimates 600 horsepower from the choke flow of the compressor map. It suits an LML owner with a tune who needs more airflow than the stock turbo provides. Garrett is candid that it has not tested boost response against the factory turbo, so buy it for flow and top-end capacity rather than for quicker response.

Design

Garrett attributes the gain in efficiency and flow to a lightweight forged compressor wheel, fully machined. The turbo is outline interchangeable with the factory hardware for a correct fit, and it is engineered to keep the original installation specifications.

Features

Direct drop-in PowerMax GT3788V Turbo for the LML, outline interchangeable with the factory turbo
Lightweight forged, fully machined compressor wheel
19 percent more flow than the original turbo
Maintains the factory installation specifications

Specifications

Turbo model: GT3788V
Compressor inducer and exducer: 65mm and 91mm
Compressor trim and A/R: 55 trim, 0.58 A/R
Turbine inducer and exducer: 72mm and 62mm
Turbine trim and A/R: 75 trim, 0.90 A/R
Garrett power rating: 600 horsepower

Applications

Garrett lists the PowerMax GT3788V Turbo for these 6.6L Duramax LML trucks:

Chevrolet 2500HD: 2011-2016 | 6.6L Duramax LML
Chevrolet 3500HD: 2011-2016 | 6.6L Duramax LML
GMC 2500HD: 2011-2016 | 6.6L Duramax LML
GMC 3500HD: 2011-2016 | 6.6L Duramax LML

Notes

The 600 horsepower figure is Garrett’s estimate from the choke flow of the compressor map; results depend on modifications and calibration
Garrett has not tested boost response against the factory turbocharger
Earlier 2004.5-2009 Duramax trucks use the Duramax PowerMax Stage 1 turbo

Frequently Asked Questions

Will the PowerMax GT3788V Turbo fit my LML? Yes, if the truck is a 2011-2016 Chevrolet or GMC 2500HD or 3500HD with the 6.6L Duramax LML. Garrett lists the PowerMax GT3788V Turbo for that engine as a direct drop-in that is outline interchangeable with the factory turbo. Earlier and later Duramax engines need different parts.
How much horsepower will it support? Garrett estimates 600 horsepower, calculated strictly from the choke flow of the compressor map and representing potential flywheel horsepower. It is a turbo capability figure rather than a measured result, and an LML reaches what its fueling, exhaust and calibration allow, which is why the tune matters as much as the hardware.
Will it spool faster than the stock turbo? Garrett does not claim that. It states that boost response of this PowerMax compared to the factory turbo has not been tested. The published claims are 19 percent more flow and better efficiency from the forged, fully machined compressor wheel.
Do I need a tune? If the aim is power, plan one. Garrett ties the result to the modifications and the calibration of each truck, and an LML left on factory software will hold its stock boost and fuel targets. In that state the 19 percent flow increase sits unused, and the turbo simply replaces the original.
Is any fabrication needed? No. Garrett describes the turbo as a direct drop-in that maintains the original installation specifications and is outline interchangeable with the factory hardware. It goes into the stock location using the existing mounting arrangement, so the job is the same as replacing a factory turbo of the same type.

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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Garrett PowerMax GT3788V Turbo for 2011-2016 Chevrolet and GMC 6.6L Duramax LML [886976-5004S]

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Garrett PowerMax GT3788V Turbo for 2011-2016 Chevrolet and GMC 6.6L Duramax LML

Design

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Notes

Frequently Asked Questions

About Garrett

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