Turbosmart 40mm Wastegate Gen V Compgate

The Gen V Turbosmart 40mm Wastegate is designed with compact size and maximum flow in mind. It provides the highest level of boost control in its class.

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Turbosmart 40mm Wastegate Gen V Compgate

Included in the Box 
• Wastegate unit (pre-assembled with spring as per order)
• SS316 Valve seat
• Inlet V-Band
• Inlet SS304 weld flange
• Outlet V-Band
• Outlet SS304 weld flange
• Collar tool (master/slave)
• 17/7 PH 3, 5, 7, 14 psi spring kit (1x spring installed)
• 4x 1/8” NPT plugs (1x installed) / 2x 1/8” NPT nipples
• Sticker
• Instruction card

The Gen-V WG40 Compgate40 external wastegate is a cost-effective, high-performing 40mm external wastegate. The Gen-V provides extensive user configurability, world-leading extended thermal performance, fatigue resistance, and best-in-class flow performance for optimum control and longevity.

  • Liquid cooling provision
  • Strap type V-band clamps
  • User adjustable actuator position
  • Modular actuator design

The Gen-V WG40 CompGate 40 external wastegate is the ultimate in boost control and quality. We switched from the Tial 44mm after real-world testing showed it was no match for the newest design from Turbosmart.

The WG45 has superior thermal capacity, handling the most demanding applications with ease. It features a rotatable actuator which makes installation in tight spaces much easier. The diaphragm design is hands down the best in the industry and able to withstand any abuse you throw at it. The internal design outflows anything in its size range.

If you’re in the market for a wastegate in the 40mm size range you won’t find anything better at any price.


Suitable for medium-large capacity engines with medium frame turbochargers systems -or- to be used as twin wastegate configuration for high power twin-scroll setups.


Valve diameter 40mm Mass 752g Linearity -1.13% of full lift (BFSL) Hysteresis 8.5% of base pressure Set pressure accuracy +/- 0.5 psi of base pressure Safe working pressure max. 220 psi / 1520 kPa / 15 bar Safe inverted pressure max. 180 psi / 1250 kPa / 12.5 bar Actuator life 750k cycles @ 180ºC ambient 1000k cycles @ 80ºC ambient Actuator/Valve ratio 2.0:1 Max. spring base pressure 26 psi / 180 kPa / 1.8 bar Min. spring base pressure 3 psi / 21 kPa / 0.2 bar Port fittings type Air: 2x 1/8” NPT top chamber Air: 2x 1/8” NPT lower chamber Liquid Cooling: 2x 1/8”

NPT THERMAL DATA Max. thermal stress (non-cooled)* >30min @ 1250ºC EGT continuous Max. thermal stress (h2O cooled)* >24hr @ 1250ºC EGT continuous Max. ambient/compartment temp. 260ºC / 500ºF Max. actuator temp. 310ºC / 590ºF

MATERIAL DATA Main Body High temp 347 SS Diaphragm Proprietary Silicone w/ Nomex Actuator housing 6061 T6 anodized Al. Valve Guide Nitronic 60 Valve EV8 w/ proprietary plating V-Band Heat treated 431 SS w/ 18-8 nut Weld Flanges 304 Stainless Steel Springs 17/7 PH Stainless Steel Beryllium (Be) 0%

FLOW DATA Max. Flow 165.4 CFM/4.53 m3 /min @1psidP Flow Linearity -15% of full lift (BFSL)

Additional information

Wastegate Color

Black, Blue, Purple

Wastegate Spring

7 PSI Spring, 14 PSI Spring