DIRE need of some assistance!!!, Car not performing like it should Options

[natedogg]

But he has an aftermarket wastegate actuator.  I'm assuming this means he has a much stiffer spring which means he could also run too much boost with the actuator spring.  I dont have any experience with aftermarket wastegates, but shouldnt this be right?  I know my stock actuator's spring held up to ~15 PSI.

All the stock solenoid does is divert some of the pressure signal to the intake. Since it is taking signal away from the actuator it would actually cause his boost to rise to a higher level than what the actuator spring is set for. There is no way for the solenoid to increase the boost signal to the actuator. The lowest maximum boost a properly running turbocharged car can see is whatever the actuator spring is set at. So simply running a vacuum line from the boost source at the compressor outlet to the WG actuator nipple is the surest way to run that lowest maximum boost.

This is of course assuming that his actuator is functioning properly. If it isn't it may open way too early or it may not open at all. Going by the starting post of this thread, I'd say he is either running on a healthy actuator spring pressure of 12 to 13 psi and the mbc is just not working, or the actuator is malfunctioning and opening the WG too early. Trying a different mbc may yield some answers or running a vacuum line directly from the boost source to the actuator may help. Running the vacuum line back to the stock boost control solenoid just adds to the complexity and isn't necessary IMHO.

Another thing that Spy mention earlier is checking for boost leaks. This could very well be your problem.