Product Description
BorgWarner 178787 S400SX Turbine Housing 87mm .90 A/R T4
The BorgWarner 178787 S400SX Turbine Housing 87mm .90 A/R T4 is a genuine replacement and upgrade turbine housing designed for BorgWarner AirWerks S400SX turbochargers equipped with 87mm turbine wheels. Featuring a .90 A/R ratio and divided T4 inlet flange, this housing is engineered to improve spool-up characteristics while maintaining excellent airflow and turbine efficiency for high-performance diesel applications.
Commonly used in performance Cummins, Duramax, and Power Stroke builds, the BorgWarner 178787 housing is a popular choice for builders seeking quicker turbo response without sacrificing the airflow capability that makes the S400SX platform a proven performer in street, drag racing, sled pulling, and compound turbocharger applications.
Features
- Genuine BorgWarner AirWerks S400SX turbine housing
- Designed for 87mm S400SX turbine wheels
- .90 A/R turbine housing ratio
- Twin-scroll divided T4 inlet flange
- Improves spool-up and throttle response
- Maintains strong airflow characteristics
- High-temperature cast construction
- Direct replacement for compatible S400SX turbochargers
- Excellent for performance single turbo applications
- Ideal for custom turbocharger and compound turbo builds
- Built for durability in demanding diesel environments
Fitment
- BorgWarner AirWerks S400SX turbochargers with 87mm turbine wheels
- S464/87 turbocharger applications
- S471/87 turbocharger applications
- S475/87 turbocharger applications
- 5.9L Cummins performance builds
- 6.7L Cummins competition applications
- 6.6L Duramax performance builds
- 6.0L Power Stroke performance applications
- 6.4L Power Stroke racing builds
- Custom diesel turbocharger projects
Note: Proper fitment depends on turbine wheel size, turbine housing configuration, manifold compatibility, and turbocharger specifications. Verify turbine wheel dimensions and housing requirements before ordering.
What's Included
- BorgWarner 178787 S400SX Turbine Housing
- .90 A/R Divided T4 Housing Assembly
Specifications
- Manufacturer: BorgWarner
- Part Number: 178787
- Product Type: Replacement Turbine Housing
- Turbocharger Series: AirWerks S400SX
- Turbine Wheel Compatibility: 87mm Turbine Wheels
- Turbine Housing A/R: .90
- Turbine Inlet Flange: Divided T4 (Twin-Scroll)
- Construction: High-Temperature Cast Iron
- Application: Performance Diesel Turbocharger Systems
- Primary Use: Turbocharger Replacement or Performance Upgrade
- Engine Compatibility: Cummins, Duramax, and Power Stroke Applications
Cross Reference Numbers
178787, BorgWarner 178787, S400SX Turbine Housing, S400 .90 A/R Housing, T4 Divided Turbine Housing, S400SX 87mm Housing
FAQ
What turbine wheel size is the BorgWarner 178787 designed for?
The 178787 turbine housing is designed for use with BorgWarner S400SX turbochargers utilizing 87mm turbine wheels.
What does the .90 A/R ratio provide?
A .90 A/R housing generally improves turbocharger spool-up and throttle response compared to larger A/R housings while still supporting strong airflow for high-performance applications.
Does this housing use a divided T4 inlet?
Yes. The BorgWarner 178787 utilizes a twin-scroll divided T4 inlet flange designed to work with compatible divided T4 exhaust manifolds.
Can this housing be used on an S475 turbocharger?
Yes. This housing is commonly used on S475/87 configurations and other compatible S400SX turbochargers equipped with 87mm turbine wheels.
Is this a genuine BorgWarner housing?
Yes. The 178787 is a genuine BorgWarner AirWerks S400SX turbine housing designed to meet original equipment specifications and performance standards.
Will this fit every S400 turbocharger?
No. Fitment depends on turbine wheel size, turbine housing style, and specific turbocharger configuration. Always verify compatibility before purchasing.
