GTA4088S HP Turbocharger for Caterpillar C13 Acert | New

GTA4088S 10R2027 High Pressure Turbocharger for Caterpillar C13 Acert

GTA4088S

The GTA4088S is the high-pressure turbocharger in the Caterpillar C13 Acert compound (two-stage) turbo system, used from 2005 on the 12.5L C13. The Acert C13 runs two turbos in series: the smaller high-pressure GTA4088S spools fast for low-end response and feeds the larger low-pressure unit (GTA4702B) that handles top-end airflow. This is the high-pressure side, fitted to industrial and on-highway C13 Acert engines including Kenworth module trucks. Our GTA4088S is built new to OEM-spec and balanced before it ships, and we confirm the part number against your engine serial first. We supply repair shops, fleets and distributors with single units and bulk orders.

Turbo Model

GTA4088S (high pressure)

OEM / Interchange Numbers

743279-5004S, 743279-0001, 242-4334, 10R2027, 2395581, 2395583, 500496

Application

2005- Caterpillar industrial CAT C13 Acert High Pressure

Service & Support

1-Year Unlimited-Mileage Warranty
US Stock, Fast Dispatch
Bulk Orders Welcome
White-Label Support
Fully Certified

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FAQ

The GTA4088S is the high-pressure turbo in the Caterpillar C13 Acert two-stage system, used from 2005 on the 12.5L C13, including industrial and Kenworth module trucks.

This is the high-pressure unit, the smaller turbo that sits closest to the engine and spools first.

It pairs with the low-pressure GTA4702B. We can supply the high-pressure GTA4088S and the low-pressure unit separately or as a set.

Not always. If only the high-pressure side failed you can replace it alone. When mileage is high, many shops do both since they wear at a similar rate.

Yes, brand new with 100% new components, built to OEM-spec and balanced before dispatch. No core charge and nothing to return. One-year warranty.

Yes. We hold it in US stock and supply shops, fleets and distributors with single units or bulk orders, priced for resale.

GTA4088S High Pressure Turbo: The C13 Acert Two-Stage System

The C13 Acert uses sequential twin turbos, so getting the right one means knowing which side you need. The GTA4088S is the high-pressure unit.

How the C13 Acert compound system works

The Acert C13 runs two turbos in series. The high-pressure GTA4088S sits closest to the engine and spools quickly for low-end torque, then feeds the larger low-pressure turbo that handles airflow at higher RPM. Both sides have to be right for the engine to make rated power and run clean.

High pressure vs low pressure

The GTA4088S is the high-pressure turbo. Its pair is the low-pressure GTA4702B (743279 / 10R2027 low-pressure series). If you are diagnosing a boost or smoke problem, confirm which unit has failed before ordering, since the two are different turbos with different part numbers.

Detail	GTA4088S
Position	High pressure (compound system)
Paired with	GTA4702B low pressure
Engine	C13 Acert 12.5L
Years	2005 on

Do you replace one turbo or both?

If only the high-pressure unit has failed you can replace it alone. Many shops do both when mileage is high since they wear at a similar rate. We supply the high-pressure GTA4088S and the low-pressure GTA4702B separately or as a pair.

Before you install

On the Acert system, check both oil feeds and drains and the crossover plumbing for restriction or debris, and prime the new turbo with clean oil. Sorting the cause of the old failure first protects the new unit and keeps the warranty valid. See our quality process for how each turbo is tested before dispatch.