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Product Details
The Turbosmart IWG75 Universal Internal Wastegate Actuator (TS-0681-4102) is a high-performance boost control upgrade engineered to improve turbocharger response, wastegate control, and boost pressure stability. Featuring a 10 PSI (0.7 BAR) base pressure spring, M6 threaded actuator rod, 140mm nominal rod configuration, and black billet aluminum housing, this universal actuator is designed for compatible internally wastegated turbochargers.
Developed as part of Turbosmart's IWG75 series, this actuator addresses several limitations commonly associated with factory internal wastegate actuators. Original equipment actuators may struggle to maintain consistent boost pressure under demanding operating conditions, particularly when increased exhaust backpressure or higher performance demands place additional force on the wastegate mechanism.
The Turbosmart IWG75 utilizes an improved internal design that increases the effective working ratio of the actuator. By optimizing diaphragm surface area and spring characteristics, Turbosmart provides improved control over the forces acting against the wastegate, helping the turbocharger achieve and maintain the desired boost pressure.
One of the primary advantages of the IWG75 design is its ability to improve boost response throughout the engine's operating range. When installed with a base spring pressure comparable to the original actuator, the IWG75 can help the turbocharger reach peak boost earlier and maintain boost more consistently at higher engine speeds, depending on the turbocharger and engine configuration.
The 10 PSI spring provides a nominal mechanical base pressure of approximately 0.7 BAR. This makes the TS-0681-4102 suitable for appropriately configured turbocharged applications requiring this spring specification.
The actuator features high-grade billet aluminum construction, providing a durable and lightweight housing designed to withstand demanding engine compartment conditions. Its black finish delivers a clean appearance that complements aftermarket turbochargers and performance engine builds.
Internally, Turbosmart incorporates its proprietary silicone-Nomex diaphragm, designed to provide responsive actuator movement and durability under repeated pressure and temperature cycling.
The IWG75 also features a stainless steel actuator rod and Turbosmart's unique locking collar system. These components provide a durable mechanical connection while allowing the actuator to be serviced or configured with compatible replacement springs.
Unlike vehicle-specific wastegate actuators, the TS-0681-4102 is a universal single-port actuator. Its M6 threaded rod configuration allows it to be adapted to a variety of internally wastegated turbochargers, provided the mounting arrangement, rod geometry, actuator travel, and wastegate lever connection are compatible.
Because this is a universal component, installation may require custom mounting brackets, a compatible clevis, additional hardware, or fabrication.
For Honda and Acura enthusiasts building turbocharged K-Series or B-Series engines, the TS-0681-4102 offers a potential boost control solution when paired with an appropriately configured internally wastegated turbocharger.
The actuator can also be used in other custom turbocharged applications where the required spring pressure and mechanical dimensions are suitable.
Whether replacing a worn factory actuator, improving boost stability, or completing a custom turbocharger installation, the Turbosmart IWG75 TS-0681-4102 provides a premium solution for precise mechanical wastegate control.
Features
Turbosmart IWG75 Series: Performance internal wastegate actuator designed for improved turbocharger boost control.
10 PSI Base Pressure Spring: Supplied with a nominal 10 PSI (0.7 BAR) spring configuration.
Universal Single-Port Design: Suitable for compatible internally wastegated turbochargers.
M6 Threaded Actuator Rod: Designed for applications requiring an M6 threaded connection.
140mm Nominal Rod Configuration: Identified by Turbosmart as the universal M6 140mm actuator variant.
High-Grade Billet Aluminum Housing: Provides strength and durability in demanding engine compartments.
Black Housing Finish: Complements performance turbocharger installations.
Proprietary Silicone-Nomex Diaphragm: Designed for responsive operation and long-term durability.
Stainless Steel Actuator Rod: Provides corrosion resistance and reliable mechanical operation.
Turbosmart Locking Collar System: Supports servicing and compatible spring changes.
Improved Working Ratio: Designed to increase actuator effectiveness compared with many factory units.
Enhanced Boost Response: Can help the turbocharger achieve target boost earlier in the RPM range.
Improved Boost Holding Capability: Helps reduce unwanted boost drop-off under suitable operating conditions.
Responsive Wastegate Operation: Provides controlled movement of the internal wastegate mechanism.
Serviceable Spring Configuration: Compatible replacement spring options are available separately.
Optional Spring Pressure Range: Turbosmart offers IWG75 spring options covering approximately 3–26 PSI.
Compatible with Electronic Boost Control: Can operate with appropriately configured boost control systems.
Suitable for Custom Turbo Builds: Useful for performance applications requiring a universal actuator.
Internal Wastegate Compatibility: Designed for turbochargers using an internal wastegate mechanism.
Potential OEM Actuator Upgrade: May replace suitable factory actuators when mounting and operating specifications match.
Compact Performance Design: Provides a durable actuator assembly without requiring conversion to an external wastegate.
Tunable Mechanical Configuration: Spring selection and rod adjustment allow setup for compatible turbocharger applications.
Additional Information
- Manufacturer: Turbosmart
- Part Number: TS-0681-4102
- Product Series: IWG75
- Product Type: Internal Wastegate Actuator
- Application: Universal / Custom Fitment
- Actuator Configuration: Single-Port
- Base Spring Pressure: 10 PSI
- Base Spring Pressure (Metric): Approximately 0.7 BAR
- Actuator Rod Thread: M6
- Nominal Rod Configuration: 140mm
- Housing Material: High-Grade Billet Aluminum
- Housing Finish: Black
- Diaphragm: Proprietary Silicone-Nomex
- Actuator Rod Material: Stainless Steel
- Locking System: Turbosmart Locking Collar
- Spring Configuration: Replaceable / Serviceable
- Optional Spring Range: Approximately 3–26 PSI
- Wastegate Type: Internal
- Vehicle Fitment: Universal; Modification May Be Required
Turbosmart IWG75 Technology
The IWG75 series was developed to improve the operating characteristics of conventional internal wastegate actuators.
An internal wastegate actuator uses pressure acting against a diaphragm and spring to control the opening of the turbocharger's wastegate valve.
As boost pressure increases, pressure applied to the actuator diaphragm creates force against the internal spring.
Once sufficient force is generated, the actuator rod moves and begins opening the wastegate.
This allows some exhaust gas to bypass the turbine wheel, helping regulate turbocharger speed and boost pressure.
The Turbosmart IWG75 improves this process through an increased effective diaphragm area and optimized spring design.
These improvements can provide better actuator sensitivity and help maintain more consistent boost pressure under demanding conditions.
10 PSI Spring Pressure
The TS-0681-4102 is supplied with a nominal 10 PSI (0.7 BAR) spring.
This pressure represents the actuator's nominal mechanical base spring specification.
It should not be interpreted as a guarantee that every installation will produce exactly 10 PSI of boost.
Actual boost pressure depends on several factors, including:
Turbocharger configuration.
Wastegate valve size.
Exhaust backpressure.
Actuator rod preload.
Boost reference routing.
Electronic or manual boost control settings.
Engine airflow characteristics.
ECU calibration.
Selecting the correct base spring pressure is important for proper boost control.
A spring that is too strong for the intended application may prevent the boost control system from achieving a sufficiently low boost pressure.
Improved Boost Response
Turbosmart designed the IWG75 series to provide a more effective working ratio than many factory actuators.
This improved working ratio is achieved through diaphragm and spring design changes.
The result can be more responsive wastegate control and improved resistance to forces generated by exhaust backpressure.
Depending on the application, this can help the turbocharger achieve target boost earlier and maintain boost more consistently through the upper RPM range.
Actual improvements depend on the complete turbocharger system and engine calibration.
Billet Aluminum Housing
The IWG75 features a high-grade billet aluminum housing.
This construction provides a durable enclosure for the diaphragm and spring assembly.
The black finish complements performance turbocharger installations while providing a clean appearance.
The housing is designed for demanding underhood environments where temperature cycling and vibration are common.
Proprietary Silicone-Nomex Diaphragm
The TS-0681-4102 utilizes Turbosmart's proprietary silicone-Nomex diaphragm.
The diaphragm is a critical component of the actuator because it converts pressure changes into mechanical movement.
Turbosmart's diaphragm design is intended to provide reliable operation through repeated pressure and temperature cycles.
A properly functioning diaphragm is essential for consistent boost regulation.
M6 Threaded Actuator Rod
The TS-0681-4102 uses an M6 threaded actuator rod.
This thread specification is important when selecting a compatible clevis or wastegate lever connection.
The actuator is cataloged as the universal M6 140mm configuration.
However, Turbosmart's detailed product description also refers to a 100mm-long M6 threaded section.
These measurements should not be treated as interchangeable. Verify the manufacturer's dimensional drawing and the specific measurement being referenced before ordering for a tight-clearance installation.
Universal Fitment Requirements
The TS-0681-4102 is not a vehicle-specific bolt-on actuator.
Successful installation requires compatibility between the actuator and the turbocharger's internal wastegate mechanism.
Important measurements include:
Actuator mounting bracket position.
Distance between actuator mounting points.
Rod length and available adjustment.
M6 clevis compatibility.
Wastegate lever attachment.
Required actuator travel.
Wastegate valve opening direction.
Desired base spring pressure.
Clearance from the turbine housing and surrounding components.
Custom fabrication may be required.
Internal vs. External Wastegate Applications
The Turbosmart IWG75 is designed for turbochargers equipped with an internal wastegate.
It is not a replacement for an external wastegate such as a Turbosmart GenV HyperGate45, ProGate50, or PowerGate60.
An internal wastegate uses a valve integrated into the turbocharger turbine housing.
An external wastegate is a separate valve assembly mounted in the exhaust system.
The TS-0681-4102 is intended to operate the internal wastegate mechanism through its actuator rod.
Spring Replacement and Adjustment
The IWG75 series features a serviceable spring arrangement.
Turbosmart offers optional springs for applications requiring different base pressures.
Spring changes must be performed according to Turbosmart's instructions because the actuator contains a compressed spring.
Rod adjustment and preload must also be set correctly to ensure proper wastegate operation.
Changing spring pressure or preload can alter boost behavior and may require ECU recalibration.
Electronic Boost Control Compatibility
The TS-0681-4102 can be used with suitable electronic boost control systems.
The actuator provides the mechanical foundation for internal wastegate operation, while a boost control solenoid can regulate the pressure signal reaching the actuator.
Compatibility depends on the boost controller, solenoid configuration, pressure routing, and ECU calibration.
The actuator's base spring pressure establishes an important lower operating limit for the system.
Tuning Considerations
Replacing a factory actuator with an upgraded IWG75 can change turbocharger response and boost behavior.
Even when the replacement actuator uses the same nominal spring pressure, differences in diaphragm area, rod preload, and actuator characteristics can affect boost control.
For this reason, ECU tuning or boost control recalibration may be necessary.
Monitor boost pressure and air-fuel ratio during initial testing.
Do not assume that the factory ECU calibration will safely compensate for every actuator upgrade.
Common Reasons for Replacement
Weak Factory Wastegate Actuator: Replaces an actuator that no longer maintains its intended spring force.
Inconsistent Boost Pressure: Helps address boost regulation problems caused by a worn or unsuitable actuator.
High-RPM Boost Drop-Off: Provides an upgraded actuator design that may improve boost holding capability.
Damaged Actuator Diaphragm: Replaces an actuator with an internal pressure leak or diaphragm failure.
Corroded Actuator Rod: Provides a replacement with a stainless steel rod.
Turbocharger Upgrade: Supports custom turbo installations requiring an M6 internal wastegate actuator.
Improved Boost Response: Offers an upgraded working ratio compared with many conventional actuators.
Custom Turbo Fabrication: Provides a universal actuator option for compatible internal wastegate systems.
Spring Pressure Changes: Allows selection of a suitable base pressure for a modified turbo system.
Worn Wastegate Control Components: Restores reliable mechanical operation when the original actuator is damaged.
Performance Engine Builds: Provides a durable boost control component for suitable turbocharged applications.
Serviceability Improvements: Offers access to compatible replacement springs and service components.
Installation Notes
Verify Turbocharger Compatibility: Confirm that the turbocharger uses an internal wastegate and can accommodate the IWG75 actuator.
Confirm Spring Pressure: Verify that the 10 PSI base spring is appropriate for the intended boost control strategy.
Measure the Existing Actuator: Record mounting dimensions, rod length, clevis position, and required travel.
Check M6 Thread Compatibility: Confirm that the rod connection matches the required clevis or linkage.
Allow the Engine to Cool: Never work around hot turbocharger or exhaust components.
Disconnect the Boost Reference Hose: Carefully remove the pressure hose from the existing actuator.
Inspect the Wastegate Lever: Check for binding, excessive play, or damaged linkage.
Remove the Existing Actuator: Detach the actuator rod and mounting hardware.
Inspect the Mounting Bracket: Confirm that the existing bracket is suitable or determine whether fabrication is required.
Prepare the New Actuator: Inspect the IWG75 housing, rod, spring configuration, and pressure fitting.
Install the Appropriate Bracket: Secure the actuator in the correct orientation.
Select the Correct Clevis: Use an M6-compatible clevis with the appropriate attachment dimensions.
Connect the Actuator Rod: Attach the rod to the wastegate lever without forcing the mechanism.
Set Rod Preload: Follow Turbosmart's installation instructions for the required preload.
Verify Wastegate Travel: Ensure the actuator can move the wastegate through the required operating range.
Check Mechanical Clearance: Confirm that the rod, housing, and linkage do not contact surrounding components.
Install the Boost Reference Fitting: Use the supplied fitting and follow the manufacturer's sealing instructions.
Connect the Pressure Hose: Route the hose according to the intended boost control system.
Inspect All Connections: Check the mounting hardware, linkage, and pressure fittings.
Pressure-Test the Actuator: Use regulated pressure and follow Turbosmart's recommended testing procedure.
Confirm Wastegate Movement: Verify smooth, repeatable actuator operation.
Check Boost Controller Settings: Ensure the controller is configured appropriately for the new actuator.
Perform Initial Low-Load Testing: Monitor boost pressure carefully before full-throttle operation.
Verify ECU Calibration: Recalibrate boost control and fueling as necessary.
Reinspect After Installation: Check rod adjustment, mounting hardware, and pressure connections after initial operation.
Important: Incorrect spring selection, rod preload, or boost control plumbing can result in uncontrolled boost pressure and engine damage. Professional installation and tuning are recommended.
What's Included
(1) Turbosmart IWG75 Universal Internal Wastegate Actuator (TS-0681-4102)
(1) Preinstalled 10 PSI Spring Configuration
Required actuator fasteners
Swivel hose barb fitting
Note: This is a universal actuator. Application-specific mounting brackets, clevis components, and additional fabrication hardware may be required and are not guaranteed to be included.
Upgrade your turbocharger's boost control system with the Turbosmart IWG75 Universal Internal Wastegate Actuator (TS-0681-4102), engineered to deliver improved wastegate response, durable construction, and more consistent boost regulation for compatible turbocharged applications.
Featuring a 10 PSI base spring, M6 threaded rod, 140mm nominal rod configuration, billet aluminum housing, proprietary silicone-Nomex diaphragm, stainless steel actuator rod, and Turbosmart locking collar system, this actuator provides a premium alternative to conventional factory internal wastegate actuators.
Whether upgrading a factory turbocharger, completing a custom K-Series turbo build, or improving boost control on a compatible performance application, the Turbosmart TS-0681-4102 delivers the engineering, serviceability, and performance-focused design expected from Turbosmart.
| Part Number: | TS-0681-4102 |
| Brand: | Turbosmart |
| Color: | Black |
| Size: | 140mm |
| CARB Approved: | No |
Not legal for sale or use in California on any pollution controlled motor vehicles. See http://www.semasan.com/emissions for state by state emissions requirements.
There is a 5% cancellation fee if you order this product and want to ship it to the state of California.
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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