17-7 PH Stainless-Steel Actuator Spring
The actuator spring is manufactured from 17-7 PH stainless steel, selected for its ability to maintain consistent pressure under elevated temperatures.
TiAL specifies resistance to spring relaxation at temperatures up to approximately 900°F / 483°C.
Spring selection plays an important role in determining the wastegate’s base boost pressure, so the correct spring should be selected for the specific turbocharger and engine combination.
Multiple Boost-Control Ports
Installation flexibility is one of the MV-R’s standout features.
The wastegate provides:
- Three lower air ports
- Two upper air ports
- Plugs for unused ports
This multi-port configuration gives installers flexibility when routing boost-control lines without requiring the actuator top to be rotated.
That can make plumbing cleaner in tight engine bays and custom turbo applications.
Integrated Water-Cooling Ports
For extreme applications such as road racing, the MV-R actuator top incorporates -4 AN water-cooling ports.
A small amount of engine coolant can be circulated through the actuator top to help reduce operating temperatures during sustained high-load use.
The water-cooling system is factory leak-tested. The ports can also be removed from service when water cooling is not required, according to the supplied product information.
V-Band Inlet & Outlet
The MV-R uses V-band connections at both the inlet and outlet, providing a compact mounting solution for custom turbocharger exhaust systems.
Flanges and clamps are included with the wastegate, making the V-band configuration convenient for fabrication and installation.
Always verify the dimensions and flange arrangement against your existing manifold before ordering.
Product Specifications
| Specification | Details |
|---|---|
| Brand | TiAL |
| Model | MV-R |
| Wastegate Size | 44mm |
| Product Type | External Wastegate |
| Body Color | Red |
| Valve Material | NiCrFe-Based High-Temperature Alloy |
| Valve Housing | 347 Stainless Steel |
| Actuator Spring | 17-7 PH Stainless Steel |
| Spring Quantity | 7 Springs |
| Upper Ports | 2 |
| Lower Ports | 3 |
| Water Cooling | Integrated -4 AN Ports |
| Inlet | V-Band |
| Outlet | V-Band |
| Included Hardware | Flanges & Clamps |
| Compatible TiAL Configuration | V44 |
What’s Included
The MV-R package includes the wastegate and installation hardware required for its V-band configuration.
The supplied product information identifies:
- TiAL MV-R 44mm Wastegate
- Seven spring options
- V-band inlet flange
- V-band outlet flange
- V-band clamps
- Plugs for unused boost-control ports
Verify the exact package contents with the manufacturer’s current specifications before installation.
Where Can You Use a TiAL MV-R 44mm?
The MV-R is intended for turbocharged performance applications, including:
- Custom turbo builds
- Street performance cars
- Track vehicles
- Road-racing applications
- High-output turbo engines
- Fabricated turbo manifolds
- Custom exhaust systems
This is a universal-style performance component rather than a vehicle-specific replacement part. Fitment depends on the manifold, flange configuration, exhaust routing, turbocharger, and available clearance.
Installation Considerations
Before installation, verify:
- Your manifold is designed for a compatible 44mm external wastegate.
- The V-band flange dimensions match your installation.
- There is adequate clearance around the actuator.
- Boost-control lines are routed correctly.
- Unused air ports are properly plugged.
- The selected spring matches your desired base boost strategy.
- Water-cooling connections are correctly configured if used.
Because the MV-R is part of the turbocharger’s boost-control system, incorrect installation or spring selection can affect engine boost levels.
Why Choose an External Wastegate?
An external wastegate provides dedicated control of exhaust flow around the turbocharger turbine.
For custom turbo systems, an external wastegate can provide flexibility in manifold design and boost control while allowing the builder to select the wastegate size and spring configuration appropriate for the application.
The 44mm MV-R combines that functionality with a compact body, multiple boost-control ports, V-band connections, and optional water cooling.
Frequently Asked Questions
What size is the TiAL MV-R?
The TiAL MV-R is a 44mm external wastegate.
What color is this MV-R?
This listing is for the red-body version.
Is the MV-R an external wastegate?
Yes. The MV-R is an external turbocharger wastegate.
How many boost-control ports does it have?
The MV-R provides three lower ports and two upper ports, allowing flexible boost-control plumbing.
Does it have water cooling?
Yes. The MV-R incorporates -4 AN water-cooling ports in the actuator top for applications where additional thermal management is required.
What material is the valve made from?
The valve uses a high-temperature NiCrFe-based alloy, while the valve housing is made from 347 stainless steel.
What type of actuator spring does it use?
The MV-R uses a 17-7 PH stainless-steel actuator spring designed to maintain consistent pressure at elevated temperatures.
Does it work with a TiAL V44?
The supplied information identifies the MV-R as a direct bolt-on for the TiAL V44 configuration.
Does it use V-band connections?
Yes. The MV-R uses V-band inlet and outlet connections, with flanges and clamps included according to the supplied listing.
Is this a vehicle-specific wastegate?
No. The MV-R is a performance external wastegate intended for compatible turbocharged systems. The specific vehicle application depends on the turbo manifold and exhaust configuration.
Compact TiAL 44mm Boost Control
The TiAL MV-R 44mm Wastegate with 7 Springs combines compact packaging with high-temperature materials, five boost-control ports, optional water cooling, and V-band installation.
For custom turbocharger systems where space is limited and precise exhaust-flow control is required, the MV-R provides a purpose-built 44mm external wastegate solution.
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