How to replace the actuator spring and hold the boost pressure as the table described?

Firstly, please check the following 4 points before inspection of the turbocharger.

1. Compressor housing outlet, intercooler circuit, and connections.

2. Turbine Housing inlet, manifold circuit, gasket, and connections.

3. Turbine Housing outlet, dump pipe circuit, gaskets and connections.

4. Compressor housing inlet, air filter clean situation and connections.

Waring: The troubleshooting guide may only be conducted with the vehicle in drivable condition. Please stop the trials at signs of engine malfunction such as black smoke, excessive oil consumption, or run-away engine.

 

Please have a reference of our actuator spring pressure table. Our spring full-stroke displacement is 14.5 mm, the default preload will be setup to 2 nut turns (1.5 mm stroke displacement). You can adjust the preload stroke as the following table and the video. 

Please check the following video to learn how to replace with the spring of adjustable actuator.

Now you could adjust it more tightly with preload the rod end as following steps.

Suggestion 1.: Preload 

You can preload the actuator rod to get a higher boost pressure. please check the following 2 videos


BTW, Please make sure the manifold and the inter-cooler pipe that connected with the turbocharger without leak.

Suggestion 2: https://store.kinugawaturbosystems.com/products/kinugawa-turbo-big-head-for-adjustable-internal-wastegate-actuator-2-in-1

Big head actuators (like the KINUGAWA Big Head actuator) have a larger diaphragm and spring, which allows us to hold the wastegate closed until the desired peak boost is achieved. On the other hand, normal head actuators have a common issue where the turbine inlet pressure can overpower the spring in the actuator. This causes the wastegate to open at lower than intended boost levels.

As boost pressure increases, normal head actuators often struggle to close the wastegate fully until higher boost levels are reached.

 

These differences result in better performance from our big-head actuators, especially in maintaining desired boost levels. 🚗💨 [Read more here]

Suggestion 3: https://store.kinugawaturbosystems.com/products/kinugawa-adjustable-iwg-to-ewg-bracket-convert-kit-internal-to-external-wastegate

The Adjustable IWG to EWG Bracket Convert Kit Internal to External Wastegate, but there are some considerations.

1. Cost & Complexity: EWG setups are generally more expensive and complex to install than IWG setups, requiring additional components and fabrication work.

2. Noise: The open dump design of many EWG setups can be significantly louder than IWG setups.

3. Tuning Requirements: EWG setups may require more extensive tuning to achieve optimal performance and avoid issues like boost creep or boost spikes.

[Read more here]