So, about two weeks ago I got my car tuned, I was setup with three i-Boost settings (setting #1: 7 psi, #2: 9 psi, #3 : 14 psi)… the car was hitting the set boost on the dyno but a few days later I noticed that either setting wouldn’t get me past spring pressure, which is about 5.5 psi…

I looked around and didn’t find any vacuum leaks… so; I’m not sure what the issue could be? My guess right now is maybe the wastegate? Or the EBC solenoid? Not sure though… any input would be appreciated!

 

you basically have nailed down the possible problems.

you'll have to check all those things now. wastegate lines, power to the EBC etc. you logged your wastegate duty and made sure it was still tryin to hit the target?

 

When I was having issues with my BC I used my compressor to test it.

I have haltech ECU and use its PID and output to control my boost.


What I did was set my boost target to some value <<25 and then used my compressor to put 25psi to the maps sensor. Slowly start releasing the pressure. As your pressure levels approaches your set point you will feel/hear the valve toggling in an attempt to maintain the right pressure.

Be sure to check your PID settings and make sure the values are non zero for at least the PD.