Hey everyone,

New to the forum and new to the car scene.
I recently installed a forge WGA on my Evo 8 and had it tuned to 15psi.
I preloaded it with 4 turns. When I go to log, I consistently overboost to 24 to 28psi.
I can't seem to figure out what the problem is.

I have only slightly modded the car, the following is what was done:


- Braided Lines 6AN Fuel tank to rail
- STM Fuel Rail
- Fuel Lab Mini FPR
- JDC Coil on Pack
- Walboro 255 pump
- New OEM injectors

- Forge Wastegate actuator (9 - 15psi spring)
- Tial BOV
- Mishimoto Intercooler
- Mishimoto Radiator
- STM Downpipe
- STM 3 piece cat back exhaust
- Zeitronix ZT2 wideband and boost

 

1. Wastegate preload: You mentioned that you preloaded the Forge Wastegate actuator with 4 turns. It's possible that the preload is not set correctly, causing the wastegate to not open at the desired boost level. Double-check the manufacturer's instructions for the correct preload setting and make sure it is properly adjusted.

2. Wastegate actuator spring: The Forge Wastegate actuator comes with a 9-15psi spring. It's possible that the spring is not providing enough tension to keep the wastegate closed at higher boost levels. You may need to consider upgrading to a stronger spring or adjusting the preload to achieve the desired boost level.

3. Boost leaks: Check for any boost leaks in your intake system, intercooler piping, or exhaust system. Even a small leak can cause inconsistent boost levels. Make sure all connections are tight and there are no cracks or leaks in the piping.

4. Tuning: It's possible that the tuning of your ECU needs to be adjusted to properly control the boost levels. If you have a standalone engine management system, consult with a professional tuner to ensure the correct settings are in place. If you are using a piggyback or flash tune, reach out to the tuner or manufacturer for assistance.

5. Mechanical issues: There could be mechanical issues with the turbocharger itself, such as a worn wastegate or a faulty actuator. Consider having the turbocharger inspected by a professional to ensure it is functioning correctly.

overboosting can be dangerous for your engine and pocket the most!!!

 

I recently delt with a fault waste gate actuator on a new turbo. This little hand pump came in extremely handing for diagnosing:

It allows you to simulate the intake manifold pressure the system will see during normal operation. You can test at what pressure the actuator begins working and visually check the movement of the wastegate to insure it is opening all the way.

Good luck!