External Wastegates: Features
- CFD tested for maximum flow and thermal efficiency
- Optimized actuation stability and temperature resistance for superior
durability - Replaceable valve and bushing components to increase service life
- Robust design for easy diaphragm replacement
- Liquid-cooled actuator ports for use on severe applications
(up to 52% reduction in body temp) - Anodized aluminum actuator cover
- Four Colors: Red | Blue | Black | Silver
- Springs | Fittings | Flanges | V-bands included
- Standard Base Pressure: 1 Bar | 14.5 PSI
- Maximum Base Pressure:
GVW40: 25 PSI | 1.7 Bar
- Minimum Base Pressure: 3 PSI | 0.2 Bar
Flow Data
Garrett engineers created GVW as a high flowing product with low degradation in performance over its lifespan. Here's how the three GVW wastegate sizes flow in LBS/MIN and KG/SEC at various increments of the valve stroke.
Material Data
The valve housing is cast from high temp stainless steel and rated for exhaust temperatures up to 1050° C. CFD optimized for maximum flow and thermal efficiency.
- Valve Housing: High temp stainless steel rated up to 1050° C
- Diaphragm: High temp Nomex reinforced elastomer
- Actuator Cover: Fully-machined anodized 6061 aluminum
- Valve Guide | Bushing: Nitronic 60
- Valve: high temp stainless steel with plated stem
- V-Band: CNC machined 304 stainless steel
- Flanges: Fully-machined 304 stainless steel
- Springs: 17/7 PH stainless steel
Mechanical Data
- Valve Diameter: 40mm
- Valve Mass: (40mm)1.27kg | 45oz
- Max Spring Base Pressure: 1.7 bar | 25 psi (1:1 backpressure ratio)
- Minimum Spring Base Pressure: 0.2 bar | 3 psi (1:1 backpressure ratio)
- Port Fitting | Air: M10x1.0 to hose barb (hose ID 6mm | .25in)
- Port Fitting | Water: M8x1.0 to AN-3
Thermal Data
When researching and testing common shortfalls of wastegates, we observed how heat cycling and normal wear can rapidly change their actuation characteristics. Garrett engineers created GVW as a high flowing product with low degradation in performance over its lifespan. Actuation data (opening and closing) in the chart was measured before and after extreme testing conditions. Results show the heat cycled GVW product maintains linear control of the wastegate as compared to the new product. Precise actuation of the GVW provides accurate calibration settings and performance throughout the lifespan of the product. Accurate wastegates, allow for optimum performance of the turbocharger.
- Max Thermal Stress (non-cooled): 270°C actuator body temp during thermal cycle test
- Max Thermal Stress (liquid-cooled): 130°C actuator body temp during thermal cycle test
- Max Exhaust Temp | Peak: Up to 1050°C
4 Color and Size Options
Kit Contents
GVW Wastegates include all the following parts:
- Springs
- V-Band: Inlet | Outlet
- Outlet Flange
- Inlet Flange
- Valve Seat
- Washers: M8 | M10
- Water Fittings
- Banjo Bolt and Banjo Fittings
- Air Plugs
Wastegate Springs
GVW wastegates are set to 1 Bar | 14.5 PSI of base pressure and can be configured from 0.2 Bar | 2.9 PSI - 1.7 Bar | 24.7 PSI (considering 1:1 backpressure).
Wastegate Flange Specs
GVW Wastegate flanges can be references in this data:
- GVW-40: Inlet OD 55.4mm | 2.18in Outlet OD 48.9mm | 1.93in (Interchangeable with Tial MV-S)
Serviceability- Replacement Kits
Replacement part kits are available for GVW wastegates. See chart for part numbers and torque specs.
- Air Fitting Kit (Banjo fitting, bolt, 2 crush washers)
- Diaphragm Kit (Diaphragm assembly, valve stem nut)
- Valve | Bushing Kit (Valve, bushing, seal washer, O-ring, valve stem nut, seat)
- V-band Inlet (V-band, bolt, locknut)
- V-Band Outlet (V-band, bolt, locknut)
GVW Wastegate Placement Suggestions
Wastegate placement on the exhaust manifold is a key factor in wastegate performance. The following suggestions can help identify the best choice when purchasing or fabricating an exhaust manifold for your project. The connection on the manifold greatly affects flow capability, and correct orientation of the wastegate to the manifold is essential.
The ideal connection is at 45° with a smooth transition (Figure 1). Placing the wastegate at 90° to the manifold (Figure 2) will reduce flow capacity by up to 50 percent and can cause over boosting! More reduction in flow capacity will result if the wastegate is placed at angles greater than 90° (Figure3). Figures 2 and 3 greatly reduce the control you have over the system and can put your entire drive train at risk. Never mount the wastegate to the turbine housing at any time, this will reduce the performance of the turbocharger (Figure 4). Contact an authorized distributor for additional information.
