914 MAP

Did you pull your TCU logs to see if there were any faults?

I’m not suspecting the turbo because wouldn’t the MP still decrease with a decrease in power? Also, no TCU warning lights and I verified the waste gate is moving with the throttle.

I’ve never looked at the data before. I have a USB cable that comes from my engine, am I assuming that’s what I need to hook up to get the TCU logs?

You first have to check the version of your TCU so you can get the right software. If it is version 4.6 you use a standard USB to serial adapter. I recommend the BUDS 4.0 software over the old TLR software but both are available to download on flyrotax.com.  

The TCU controls the wastegate to maintain optimal airbox pressure based on throttle position and ambient pressure. So you might not see a change in manifold pressure as expected if there is a malfunction or if the servo cable is loose or too tight.