Tial MV-S External Wastegate 38 MM

Tial MV-S External Wastegate – Compact High-Temperature Racing Design

The Tial MV-S External Wastegate is a premium motorsport component designed for extreme boost, high exhaust temperatures, and limited installation space. Built entirely from high-grade stainless steel and advanced alloys, this wastegate delivers exceptional reliability, precise boost control, and long service life under the most demanding conditions.

Thanks to its ultra-compact design, the MV-S measures just 3.7 inches in height, making it ideal for tight engine bays where space is limited. Despite its compact size, it offers outstanding thermal stability and flow performance.

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High-Temperature Materials for Maximum Durability

Every major component of the MV-S wastegate is engineered to withstand extreme heat and pressure:

• Valve and valve body manufactured from a NiCrFe 347SS-based alloy, ensuring superior resistance to heat fatigue and corrosion

• Valve bushings made from Nitronic 60 stainless steel for excellent wear resistance

• Actuator spring constructed from 17-7 PH stainless steel, providing consistent pressure even at temperatures up to 900°F (483°C)

• Reinforced actuator diaphragm using Nomex-reinforced silicone, ideal for sustained high-temperature operation

As a result, this wastegate outperforms many competing designs in both durability and long-term consistency.

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Integrated Actuator Cooling System

To further enhance reliability, the MV-S features an integrated actuator cooling system:

• Two -4 AN water ports allow coolant to circulate through the actuator

• This reduces heat exposure in extreme racing conditions

• The system has minimal impact on the vehicle’s cooling circuit

• Ports can be securely sealed if cooling is not required

Each unit is factory pressure-tested to ensure leak-free operation.

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Precision CNC V-Band System

The MV-S uses Tial’s CNC-machined V-band clamps and flanges, all produced in-house for perfect fitment. Therefore, installation is quick, secure, and repeatable.

• Stainless steel V-band clamps and flanges

• Strong, uniform clamping force

• Excellent sealing under high boost

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Racing Valve Stem Technology

Every MV-S wastegate includes Tial’s racing valve stem, which features a wear-resistant coating. Consequently, it resists corrosion caused by lead oxide, making it suitable for use with leaded racing fuels.

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Flexible Installation & Finish Options

• Three lower and two upper mounting ports for flexible installation

• No need to rotate the actuator housing

• Unused ports are sealed with included plugs

• Outer body finished in anodized aluminum, available in:

  • Silver

  • Red

  • Blue

  • Purple

  • Black

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What’s Included in the Box

Each Tial MV-S External Wastegate includes:

• MV-S wastegate valve

• Two removable Tial -4 AN water fittings

• MV-S valve seal

• Stainless steel V-band clamps

• Inlet and outlet flanges

• Two Tial air fittings

• Plugs for unused air ports

• Additional actuator spring

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Why Choose the Tial MV-S Wastegate?

• Ultra-compact design for tight engine bays

• High-temperature alloys for extreme durability

• Integrated water-cooled actuator

• Precision CNC V-band mounting system

• Proven motorsport reliability

• Suitable for high-boost and racing applications

The Tial MV-S External Wastegate delivers unmatched boost control, thermal stability, and durability — making it the perfect choice for serious performance builds.