Wastegate Problems

[ChandlerFihn]

I have a big 16g with an internal wastgate and am having some issues...I don't have any boost leaks..I think it has a 8psi spring in it but am not sure...when I run the wastgate by itself with no boost controller. It hits 8psi and then in third gear will creep up to 15...when I put a boost controller on...I can't get it to stay at one spot...it will go to 8 to 10 and then go up to what the boost controller is set at. If I close the controller all the way it boosts perfect but then the wastgate doesn't work and it will blow up. So I'm lost. My theory is is that the flapper can't stay closed long enough for it to go to 15psi...is this right thinking?

 

[GSTwithPSI]

You are posting conflicting information. You say it is an internal gate, but internally gated 16Gs don't have springs that control the waste gate; They typically use vacuum actuators.

What boost controller are you using, and how do you have it hooked up? Rather than explain the vacuum routing, post up a diagram of how you have it hooked up.

 

[SSGdave]

Sounds like a bad actuator.
Do you have a known working one you can swap in?