SkyRC SC120 - turbo acting odd?

[Yorkiebar]

Hi all,

Just landed a 2nd hand one of these in a setup wired to a sensored 5.5T 550 motor. It goes ok, and got my hand on a program card to change a few things.

It was in blinky when I got it. Set the neutral and endpoints as per always, Tx has everything set to 100% EPA / no curve.

What I first found odd is on the PC Link the Boost section is greyed out altogether, and doesn't show up on the program card. Is this normal for the SC edition?

Secondly, turbo. Using my trained ear test to measure RPM, when I enable it you can actually hear the motor wind down slower at full throttle rather than increase! Setting it back to blinky brings the pitch back to a fully linear note.

I'm at a loss - I've changed every turbo parameter and they all do the same.

Any ideas?