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Product Details
The Turbosmart GenV UltraGate38 External Wastegate (TS-0551-1015) is a high-performance 38mm external wastegate designed to deliver precise boost control, exceptional durability, and reliable operation in demanding turbocharged applications. Featuring a 14 PSI preinstalled spring configuration, Sleeper Black finish, and compact 38mm valve design, the UltraGate38 combines Turbosmart's proven motorsport engineering with the advanced features of its fifth-generation wastegate platform.
Engineered for both street and competition applications, the GenV UltraGate38 regulates turbocharger boost pressure by controlling the amount of exhaust gas bypassing the turbine. As boost pressure reaches the wastegate's opening threshold, the actuator responds to the pressure signal and allows the valve to open, diverting exhaust gas away from the turbine to help maintain the desired boost level.
The TS-0551-1015 features Turbosmart's distinctive Sleeper Black configuration, incorporating a black actuator cap and black locking collar for a subtle, understated appearance. This makes it an excellent option for performance builds where a clean, stealthy engine bay aesthetic is preferred.
The GenV UltraGate38 represents a comprehensive redesign of Turbosmart's earlier Gen4 wastegate platform. Developed using computational fluid dynamics (CFD) and validated through extensive testing, the GenV design delivers improved exhaust flow characteristics, enhanced thermal management, and increased fatigue resistance.
Its construction includes a high-temperature 347 stainless steel wastegate body, Nitronic 60 valve guide, and 17-7 PH stainless steel springs, providing durability under demanding exhaust temperatures and repeated boost cycles.
The UltraGate38 retains the traditional compact 38mm mounting configuration, making it a convenient upgrade for compatible Gen4 UltraGate38 installations and custom turbocharger systems using the same mounting arrangement.
Additional GenV improvements include a modular actuator assembly, clockable upper and lower housings, 1/8-inch NPT pressure reference ports, and provisions for optional liquid actuator cooling and wastegate position monitoring.
Supplied with a 14 PSI spring configuration installed, the TS-0551-1015 provides a nominal mechanical base boost pressure of approximately 14 PSI. Additional springs are included to support alternative manufacturer-approved pressure configurations.
Whether upgrading a turbocharged Honda K20/K24, building a B-Series forced-induction engine, or assembling a custom motorsport turbocharger system, the Turbosmart GenV UltraGate38 TS-0551-1015 provides dependable boost management in a compact, serviceable package.
Features
Genuine Turbosmart GenV UltraGate38: Fifth-generation external wastegate engineered for performance applications.
38mm Wastegate Valve: Provides efficient exhaust gas bypass control for compatible turbocharger systems.
14 PSI Preinstalled Spring: Supplied with a nominal 14 PSI mechanical base boost configuration.
Sleeper Black Finish: Features an understated black actuator cap and locking collar.
High-Temperature 347 Stainless Steel Body: Designed to withstand demanding exhaust temperatures.
Nitronic 60 Valve Guide: Provides excellent wear and galling resistance.
17-7 PH Stainless Steel Springs: Engineered for strength and fatigue resistance.
CFD-Optimized Flow Design: Developed to improve exhaust gas bypass efficiency.
Improved Thermal Performance: Designed for demanding turbocharger operating environments.
Enhanced Fatigue Resistance: Supports reliable operation through repeated boost cycles.
Compact 38mm Configuration: Suitable for space-constrained turbocharger installations.
Traditional UltraGate38 Mounting Pattern: Supports compatible existing Gen4 installations.
Three-Bolt Mounting Configuration: Uses the traditional UltraGate38 mounting arrangement.
Modular Actuator Design: Allows convenient servicing and configuration changes.
Locking Collar Assembly: Provides secure actuator retention and simplified servicing.
360-Degree Clockable Actuator: Allows flexible pressure reference hose routing.
1/8-Inch NPT Pressure Ports: Compatible with appropriate boost control fittings and hoses.
Optional Liquid Actuator Cooling: Supports additional thermal management when properly equipped.
Optional Wastegate Position Sensor: Allows advanced monitoring with compatible accessories.
Additional Springs Included: Supports alternative manufacturer-approved base pressure configurations.
Electronic Boost Controller Compatible: Suitable for properly configured aftermarket boost management systems.
Manual Boost Controller Compatible: Supports compatible manual boost control arrangements.
Universal Turbocharger Application: Suitable for custom forced-induction installations.
Street and Motorsport Applications: Designed for performance-oriented turbocharger systems.
Turbosmart Part Number TS-0551-1015: Ensures accurate identification and ordering.
Popular Performance Applications
The Turbosmart TS-0551-1015 is a universal external wastegate designed for turbocharger systems utilizing a compatible 38mm UltraGate mounting arrangement.
Popular applications include:
Honda Civic K20 Turbo Builds: Compatible custom turbocharger systems using K20A, K20A2, K20Z1, and K20Z3 engines.
Honda Civic K24 Turbo Builds: Supports aftermarket turbocharger installations using compatible K24 engines.
Acura RSX Type-S Turbo Builds: Suitable for custom K20 turbo manifolds with the appropriate wastegate connection.
Acura TSX K24 Turbo Applications: Provides external boost control for compatible turbocharger systems.
Honda Accord K-Series Turbo Builds: Supports custom forced-induction configurations.
Honda S2000 Turbo Applications: Suitable for compatible F20C and F22C turbocharger installations.
Acura Integra Turbo Builds: Popular for custom B-Series and K-Series turbocharger systems.
Honda Prelude Turbo Builds: Suitable for compatible H-Series and K-Series turbocharger configurations.
K20/K24 Frankenstein Turbo Builds: Supports performance-oriented forced-induction applications.
B16, B18, and B20 Turbo Builds: Compatible with properly designed external wastegate manifolds.
Subaru WRX and STI Turbo Builds: Suitable for compatible aftermarket external wastegate systems.
Mitsubishi Evolution Turbo Builds: Supports custom turbocharger installations.
Nissan SR20DET and RB-Series Turbo Builds: Suitable for compatible performance turbo systems.
Toyota 1JZ and 2JZ Turbo Builds: Supports custom external wastegate installations where a 38mm valve is appropriately sized.
Drag Racing Applications: Provides reliable boost management for properly engineered competition vehicles.
Roll Racing Builds: Suitable for performance turbocharger systems requiring precise boost control.
Custom Motorsport Applications: Supports compatible external wastegate configurations.
Important: This is a universal performance component, not a vehicle-specific direct-fit replacement. Compatibility depends on the turbo manifold, wastegate mounting pattern, available clearance, and boost control configuration.
Additional Information
- Manufacturer: Turbosmart
- Part Number: TS-0551-1015
- Product Series: GenV UltraGate38
- Product Type: External Turbocharger Wastegate
- Wastegate Valve Diameter: 38mm
- Preinstalled Spring Pressure: 14 PSI / Approximately 0.97 Bar
- Finish: Sleeper Black
- Actuator Cap Color: Black
- Locking Collar Color: Black
- Wastegate Body Material: High-Temperature 347 Stainless Steel
- Valve Guide Material: Nitronic 60
- Spring Material: 17-7 PH Stainless Steel
- Valve Seat Material: 316 Stainless Steel
- Pressure Reference Ports: 1/8-Inch NPT
- Mounting Configuration: Traditional UltraGate38 Three-Bolt Flange
- Actuator Configuration: Clockable / Rotatable
- Optional Actuator Cooling: Liquid Cooling Compatible
- Optional Position Monitoring: Wastegate Position Sensor Compatible
- Vehicle Fitment: Universal, Based on Wastegate Mounting Compatibility
- UPC: 9329677022711
38mm External Wastegate Design
The GenV UltraGate38 uses a 38mm valve to regulate exhaust gas flow through the wastegate.
When the actuator receives sufficient pressure to overcome the spring's closing force, the valve begins to open.
Exhaust gas is then diverted away from the turbocharger turbine, helping control turbine speed and boost pressure.
The compact 38mm design is popular for many four-cylinder turbocharger applications.
However, proper wastegate sizing depends on the engine's exhaust flow, turbocharger characteristics, manifold design, and intended boost pressure.
14 PSI Preinstalled Spring
The TS-0551-1015 comes equipped with a 14 PSI spring configuration.
This establishes a nominal mechanical base boost pressure of approximately 14 PSI under suitable operating conditions.
The mechanical base pressure is determined by the spring force acting against the wastegate diaphragm.
Actual boost pressure may vary depending on exhaust backpressure, turbocharger characteristics, wastegate placement, and pressure reference plumbing.
Important: An electronic or manual boost controller generally cannot reliably reduce boost pressure below the wastegate's effective mechanical base pressure.
Included Spring Configurations
The GenV UltraGate38 is supplied with additional springs to support alternative pressure configurations.
The standard spring selection includes nominal 3 PSI, 5 PSI, 7 PSI, and 14 PSI spring options.
Compatible springs may be combined according to Turbosmart's approved spring configuration chart.
The TS-0551-1015 arrives with the 14 PSI configuration installed.
Spring changes should only be performed according to the manufacturer's instructions.
Sleeper Black Finish
The Sleeper version of the UltraGate38 features an understated black actuator assembly.
Unlike brightly colored wastegate configurations, the Sleeper Black design provides a subtle appearance that complements dark engine bay components and performance hardware.
The black actuator cap and locking collar help create a cohesive appearance in custom turbocharger installations.
The finish does not change the wastegate's fundamental boost control function.
High-Temperature 347 Stainless Steel Body
The GenV UltraGate38 incorporates a body manufactured from high-temperature 347 stainless steel.
External wastegates are exposed to elevated exhaust temperatures and repeated thermal cycling.
The stainless steel construction provides durability in these demanding operating conditions.
The GenV design also incorporates improved thermal management compared with earlier generations.
Nitronic 60 Valve Guide
The UltraGate38 features a Nitronic 60 valve guide.
Nitronic 60 is a stainless steel alloy known for its resistance to wear and galling.
These characteristics are beneficial in applications involving repeated valve movement and high temperatures.
The valve guide helps maintain proper valve alignment during wastegate operation.
17-7 PH Stainless Steel Springs
The GenV UltraGate38 uses 17-7 PH stainless steel springs.
This precipitation-hardening stainless steel provides strength and fatigue resistance.
Spring durability is important because the wastegate repeatedly opens and closes as boost pressure changes.
Correct spring selection helps establish the intended mechanical base boost pressure.
CFD-Optimized Exhaust Flow
Turbosmart developed the GenV wastegate platform using computational fluid dynamics and flow testing.
The internal geometry is designed to improve exhaust gas bypass efficiency.
Efficient wastegate flow is important for stable boost pressure, particularly in applications with substantial exhaust gas volume.
Proper wastegate placement remains essential for achieving the intended boost control performance.
Traditional UltraGate38 Mounting Configuration
The GenV UltraGate38 retains the traditional mounting arrangement used by compatible earlier-generation UltraGate38 wastegates.
This makes it a convenient upgrade for certain existing installations.
The UltraGate38 uses a traditional three-bolt flange arrangement rather than the V-band mounting style found on several other GenV wastegate models.
Important: The UltraGate38 does not include weld-on flanges. Verify the existing manifold flange and gasket arrangement before installation.
Modular GenV Actuator
The GenV actuator features a modular construction designed to simplify servicing and configuration changes.
Its locking collar arrangement secures the actuator assembly while allowing spring access using the appropriate service tool.
The actuator can also be clocked to improve pressure line routing.
This is particularly beneficial in compact engine bays with limited space around the turbocharger and exhaust manifold.
360-Degree Clockable Actuator
The GenV UltraGate38 features a rotatable actuator cap and base.
This allows the pressure reference ports to be positioned for improved access and hose routing.
Proper actuator positioning can help reduce interference with surrounding components and keep pressure hoses away from excessive exhaust heat.
1/8-Inch NPT Pressure Reference Ports
The UltraGate38 incorporates 1/8-inch NPT pressure reference ports.
These ports allow the wastegate to be connected to a compatible boost pressure source or boost control system.
Depending on the control arrangement, the upper and lower actuator chambers may be connected differently.
Unused ports must be sealed with the appropriate plugs.
Always follow Turbosmart's recommended plumbing diagrams.
Electronic Boost Controller Compatibility
The GenV UltraGate38 can be used with compatible electronic boost controllers.
Electronic boost controllers regulate the pressure signal acting on the wastegate diaphragm.
This allows boost pressure to be adjusted above the mechanical base setting within the limits of the turbocharger and boost control system.
Proper engine management calibration is essential when increasing boost pressure.
Manual Boost Controller Compatibility
The UltraGate38 is also compatible with properly configured manual boost controllers.
A manual boost controller modifies the pressure signal reaching the wastegate actuator.
The mechanical spring pressure remains an important factor in determining the minimum achievable boost pressure.
Optional Liquid Actuator Cooling
The GenV UltraGate38 supports optional liquid actuator cooling.
This feature can help manage actuator temperatures in demanding turbocharger installations.
Liquid cooling may be beneficial when the wastegate is positioned close to high-temperature exhaust components or operates under sustained heavy loads.
The necessary cooling components and plumbing must be installed according to Turbosmart's instructions.
Optional Wastegate Position Sensor
The GenV platform supports an optional wastegate position sensor.
A position sensor can provide information about wastegate valve movement.
This may be useful for advanced engine management systems, data acquisition, and boost control diagnostics.
The position sensor is sold separately.
GenV vs. Gen4 UltraGate38
The GenV UltraGate38 incorporates several improvements over the earlier Gen4 platform.
These include:
Revised internal flow geometry.
Improved thermal management.
Enhanced fatigue resistance.
Updated modular actuator construction.
Clockable pressure reference connections.
Optional liquid actuator cooling.
Optional wastegate position monitoring.
The GenV UltraGate38 retains the compatible mounting arrangement of the earlier generation.
However, internal service components should not be assumed interchangeable between generations.
Standard vs. High-Pressure UltraGate38
Turbosmart offers standard and high-pressure versions of the GenV UltraGate38.
The TS-0551-1015 is the standard GenV UltraGate38 with a 14 PSI preinstalled spring configuration.
High-pressure versions are intended for applications requiring substantially higher mechanical spring pressures.
These versions may use different internal components.
Always select replacement springs and diaphragms according to the exact wastegate model.
Wastegate Placement and Boost Creep
Proper wastegate placement is essential for stable boost control.
The wastegate should be positioned so exhaust gas can flow efficiently from the manifold into the wastegate inlet.
Poor placement or restrictive outlet plumbing can reduce bypass efficiency.
If the wastegate cannot bypass enough exhaust gas, boost pressure may continue increasing even when the valve is fully open.
This condition is commonly referred to as boost creep.
Selecting the correct wastegate size and designing appropriate exhaust plumbing are essential for preventing this problem.
Common Reasons for Replacement
Upgrading From a Gen4 UltraGate38: Provides updated GenV features while retaining compatible mounting arrangements.
Inconsistent Boost Pressure: Replaces an existing wastegate that has been diagnosed as faulty.
Damaged Wastegate Diaphragm: Provides a complete replacement assembly when necessary.
Turbocharger Upgrades: Supports revised exhaust bypass requirements.
Custom Turbo Manifold Installation: Provides a compact external wastegate for compatible manifolds.
High-Performance Engine Builds: Supports reliable boost management in properly engineered turbo systems.
Electronic Boost Controller Installation: Provides a compatible wastegate platform for advanced boost management.
Existing Wastegate Damage: Replaces a cracked, worn, or otherwise damaged wastegate assembly.
Engine Bay Appearance Upgrades: Offers a subtle Sleeper Black finish.
Turbo System Rebuilds: Provides a complete wastegate for a revised forced-induction configuration.
Motorsport Applications: Supports demanding street and competition turbocharger systems.
Preventative Replacement: Replaces aging wastegate components when a complete assembly is preferred.
Installation Notes
Verify Application Requirements: Confirm that a 38mm external wastegate is appropriate for the engine and turbocharger combination.
Confirm Mounting Compatibility: Verify the traditional UltraGate38 three-bolt flange arrangement.
Review Turbosmart Instructions: Read the current GenV UltraGate38 installation documentation.
Allow the Engine to Cool: Never work on turbocharger or exhaust components while hot.
Inspect the Turbo Manifold: Check the wastegate mounting flange for damage or distortion.
Clean the Mounting Surface: Remove debris and old gasket material.
Inspect the Supplied Gaskets: Confirm they are clean and undamaged.
Install the Valve Seat: Follow Turbosmart's specified installation procedure.
Position the Wastegate: Align the wastegate with the manifold mounting flange.
Install the Mounting Hardware: Use the appropriate bolts and nuts.
Tighten Fasteners Correctly: Follow the manufacturer's specified torque requirements.
Verify Outlet Plumbing: Ensure the wastegate discharge path is properly designed.
Check Engine Bay Clearance: Maintain suitable clearance from wiring, hoses, and heat-sensitive components.
Install Heat Protection: Use appropriate shielding where necessary.
Verify the Installed Spring: Confirm that the 14 PSI configuration matches the intended mechanical base pressure.
Select Approved Spring Combinations: Use only Turbosmart-recommended spring configurations.
Clock the Actuator: Position the cap and base for convenient pressure line routing.
Install Pressure Reference Fittings: Use compatible 1/8-inch NPT fittings.
Seal Unused Pressure Ports: Install the supplied blanking plugs as required.
Connect the Boost Reference Hose: Use suitable pressure-rated hose.
Verify Boost Controller Plumbing: Follow the correct diagram for the selected control system.
Inspect All Connections: Check pressure hoses, fittings, and mounting hardware.
Perform a Controlled Pressure Test: Verify actuator response using regulated pressure.
Check for Pressure Leaks: Inspect the actuator and reference plumbing.
Verify Mechanical Base Pressure: Confirm expected operation before increasing boost targets.
Review Engine Management Calibration: Ensure the ECU is configured for the turbocharger system.
Perform Initial Low-Boost Testing: Monitor boost pressure carefully.
Check for Boost Creep: Verify that boost pressure remains controlled throughout the intended operating range.
Inspect Exhaust Connections: Check for leaks and excessive heat exposure.
Reinspect After Initial Operation: Verify mounting hardware and pressure connections after heat cycling.
Important: Incorrect wastegate installation or boost control plumbing can cause uncontrolled boost pressure and engine damage. Professional installation and tuning are recommended.
What's Included
(1) Turbosmart GenV UltraGate38 38mm External Wastegate – Sleeper Black (TS-0551-1015)
(1) Preinstalled 14 PSI Spring Configuration
Additional GenV UltraGate38 Springs – 3 PSI, 5 PSI, and 7 PSI Options
(1) GenV 316 Stainless Steel Valve Seat
GenV UltraGate38 Stainless Steel Mounting Gaskets
Mounting Bolts and Nuts
(1) Locking Collar Service Tool
(4) 1/8-Inch NPT Blanking Plugs
(2) 1/8-Inch NPT Hose Tail Fittings
(1) Turbosmart Decal
Note: Weld-on flanges, custom exhaust piping, boost controllers, and pressure reference hoses are not included.
Upgrade your turbocharger boost control with the Turbosmart GenV UltraGate38 38mm External Wastegate (TS-0551-1015), engineered to deliver dependable exhaust bypass performance, excellent thermal durability, and precise boost management.
Featuring a 38mm wastegate valve, 14 PSI preinstalled spring, Sleeper Black actuator finish, 347 stainless steel body, Nitronic 60 valve guide, 17-7 PH stainless steel springs, and modular GenV actuator design, the UltraGate38 provides the strength and flexibility required for demanding performance applications.
Whether building a turbocharged Honda K20/K24, upgrading a B-Series forced-induction system, or assembling a custom motorsport turbocharger setup, the Turbosmart TS-0551-1015 GenV UltraGate38 Sleeper Black delivers proven boost control engineering in a compact, professional package.
| Part Number: | TS-0551-1015 |
| Brand: | Turbosmart |
| Color: | Black |
| Spring Pressure: | 14 psi |
| Wastegate Size: | 38mm |
WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.
Vehicle Fitment
This part does not have vehicle specific fitment. Please contact us if you need assistance.
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