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Turbosmart IWG75 Single Port Internal Wastegate Actuator
WHAT IS A WASTEGATE
Internal or external, a wastegate is a boost-controlling device that operates by limiting exhaust gases going through the turbocharger, controlling the maximum boost pressure produced by the turbocharger itself.
A wastegate consists of an inlet and outlet port, a valve and a pressure actuator.
HOW A WASTEGATE WORKS
A pressure actuator, controlled by boost pressure determines whether the wastegate is open or shut. In its resting position, a wastegate is shut, and as the boost pressure builds, force is applied to the actuator.
When the boost pressure exceeds the spring value, the actuator will progressively open the wastegate, bypassing some of the exhaust gases therefore maintaining the boost pressure at the set level.
To put it simply – a wastegate prevents the boost pressure from climbing indefinitely and consequently blowing the engine.
WHAT IS AN EXTERNAL WASTEGATE?
An external wastegate controls boost by bleeding off exhaust gas before it gets to the turbine or rear housing of the turbocharger. Turbosmart has the largest wastegate range available on the market.
All Turbosmart external wastegates feature:
- Advanced flow technology, making our wastegate range high flowing to suit all applications
- Unrivalled heat handling capacity. Lab tested and race proven.
- A solid, one-piece coated valve
- Advanced silicone Nomex diaphragm
WHEN IS AN EXTERNAL WASTEGATE NEEDED
Most of the factory turbo systems feature an internal wastegate made to handle stock boost levels. The most common reason for investing in an external wastegate is fitting an aftermarket turbo or better control of the boost and consequently the power output of your engine. Additionally, most large frame turbochargers are not equipped with internal wastegate systems.
Most tuners will recommend an external wastegate for any engine producing 400hp or more, as running high boost through a factory internal wastegate can overpower the actuator spring, limiting maximum boost level.
Aftermarket external wastegates feature bigger inlet and outlet ports, higher pressure springs, and bigger actuator diaphragms to effectively control high boost pressure.
WHAT IS AN INTERNAL WASTEGATE ACTUATOR?
On an internally wastegated turbo, the wastegate valve is built into the turbine housing. The wastegate valve is controlled by an internal wastegate actuator. As boost rises the actuator controls the position of the wastegate valve, which in turn controls the exhaust gas flow to the turbine.
The Turbosmart wastegate actuator range has been designed as a stronger, more reliable replacement for OEM parts. Like all Turbosmart parts, billet construction means they are stronger and more durable than a stock actuator, while Turbosmart’s focus on performance means boost comes on faster and holds on longer, putting you in control!
The Turbosmart IWG-75 actuator range features:
- Base spring pressure available from 3PSI to 26PSI
- Stable boost control
- Improved boost response
- Flatter boost curve in the top end
- A range of vehicle/turbo specific applications
WHAT’S SO SPECIAL ABOUT TURBOSMART WASTEGATES
- Turbosmart wastegates offer superior flow path and high temperature resistance. They are designed and manufactured using the latest technologies.
- Turbosmart wastegates are market leaders in their sectors, outperforming and outlasting the competition.
- Used on thousands of race cars, boats and plane around the world, they are used and recommended by a number of World Champions.
IMPORTANT NOTES ON SETTING THE WASTEGATE ACTUATOR SPRING PRESSURE
The wastegate actuator allows for different combinations of spring pressures. All springs that are adaptable with the wastegate actuator are shown in the table below. To aid in the identification of these springs they are supplied colour coded. If this colour coding is not clear please use the dimensions in the following table to identify the spring. The springs chosen should be rated to the lowest boost level desired. Typically with a single port IWG, the stiffer the spring the earlier a given turbo will spool, since the WG does not bypass any exhaust gas during spoolup.
WARNING!
- Fitting a heavier wastegate actuator spring may cause a higher than expected increase in boost pressure.
- Turbosmart recommends adjusting your boost controller back to its minimum setting (or unplugging the solenoid) and measuring the new minimum boost pressure achieved by the new spring, before increasing your boost pressure again.
- Use of a turbocharger speed sensor is a good idea if you plan to run very high boost levels
If a 3 Port Boost Control Solenoid is used, this is the correct plumbing orientation diagram:
Note: For setups that want a larger range of boost control -or- want to acheive high boost on a soft spring, we recommend using their Twin Port IWG with a 4 port boost control solenoid.
For additional information and/or related questions, feel free to contact us.
- [email protected]
- (866) Full-Race
| Weight | 2 lbs |
|---|---|
| Dimensions | 10 x 4 x 4 in |
| Actuator | 10 PSI / 0.7 Bar, 14 PSI / 1.0 Bar, 19 PSI / 1.3 Bar, 22 PSI / 1.5 Bar, 26 PSI / 1.8 Bar |
| Actuator Length | BorgWarner EFR B1 Single Scroll 120mm Rod, BorgWarner EFR B1 Twin Scroll 140mm Rod, BorgWarner EFR B2 Single and Twin Scroll 160mm Rod |
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