Wastegates & Accessories

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What does a wastegate do?

The wastegate’s job is to divert excess exhaust gases away from the turbine – controlling the speed of the turbine and preventing it from spinning too fast.

By controlling and limiting the speed of the turbine, the wastegate regulates the boost pressure provided by the turbocharger. By preventing the boost pressure from rising indefinitely, the wastegate protects the turbocharger and the engine from damage.

How does a wastegate work?

In most cases, a wastegate is a relatively simple valve, controlled by a pressure actuator linked to the boost pressure of the turbo.

The wastegate is held shut by a spring inside the actuator, but when the boost pressure exceeds the pre-set maximum, it compresses this spring, progressively opening the wastegate. This allows the exhaust gases through, so that they bypass the turbine, regulating its speed.

AET Motorsport only stock the best products with years of tried and tested experience. We can also offer fitting and dyno testing in our workshop using our trained technicians. 

Choosing the right spring

The springs that are installed in either an internal or external wastegate should be rated to the lowest boost pressure desired. The lowest boost level achieved cannot be lower than the spring rating as the spring only begins to allow the valve to open at the pressure rating of the spring.

With a boost controller installed, a general rule of thumb is that the maximum boost level that can be achieved safely is double what the spring is rated to. If your target boost pressure is 20 PSI, a minimum spring rating of 10 PSI is recommended. This gives the wastegate more control over the exhaust gas. If the spring rating is too low, as boost levels climb and exhaust flow rates increase, the flow of exhaust can influence the valve more as the only force trying to close it is the spring force.

If the spring is too soft, even with no pressure signal to the actuator, the valve will open if there is enough exhaust back pressure, which will limit the amount of boost produced by the turbocharger.

AET Motorsport only stock the best products with years of tried and tested experience. We can also offer fitting and dyno testing in our workshop using our trained technicians. 

Actuators

Turbosmart internal wastegate actuators have a valve built in to the turbine housing. The wastegate is controlled by an actuator which consists of a spring and a sealed chamber. The sealed chamber of the actuator is connected to a pressure only source normally on the compressor cover of the turbocharger. Turbosmart internal wastegate actuators are made from high quality materials which can withstand high stresses and temperatures for prolonged periods of time.

AET Motorsport are well known for been the Main Distributor in both the UK and Ireland for all Products in the Turbosmart Range. We have been working with Turbosmart since its early days when the catalogues didn't take much reading at all through to today where they feature over 400 products.

AET Motorsport only stock the best products with years of tried and tested experience. We can also offer fitting and dyno testing in our workshop using our trained technicians. 

With next day delivery we can get you back up and running quickly. 

 

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