If there is no signal line going to the wastgate, will it still vent? I am trying to troubleshoot my system. it keeps venting at 5-9 psi.

I went back to a modified stock wastegate without the MBC inline, thinking maybe the deltagate would just sit there idly bypassed and let the stock style gate do it's job instead. Nope, still max venting by 9psi. I assume this has to be related somehow to the spring pressure in the wastegate. But what gives it added resistance to opening?

Can I bypass or render ineffective the deltagate? I reinstalled the stock actuator in order to use the internal wastegate, but it doesn't matter til I can get the other one to stop opening...

Any other ideas what my problem is?

 

So you have an internal and external gate?

I would wire the internal shut.

If you run a vacuum line straight from the intake to the top (close side) of the external it should have -lots- of boost. (remove vacuum hose from bottom 'open' side of gate)

With no vacuum lines connected to the external gate at all, backpressure can still push it open.

 

yes I have both, but the external seems to be faulty. I want to go back to the internal only to see if it sovles my problem. so bypassing the external (at least temporarily) would be the route I'd like to follow...

 

Well, if the external is bad, (diaphragm broke), the only thing you could do to bypass it is make a blockoff plate(s), or take the top off the gate, remove the spring and use something solid to shim it closed when you put the top back on.