Im on the dyno tuning a 2011 ctsv. Installed lower pully (metco 8.6) and spacer lid. I tuned the car with smaller upper pulley and car made 575 whp. My afrs are 11.3 across the board. When we installed the lower pulley I put it back on the dyno to clean up the tune. I pulled a few degrees of timing out. As we climb in rpm car pulls a few degrees of timing out. then around 4900 it kills the boost. I then pulled 2 degrees out and same issue. not sure if im maxing a torque value out here. AFR stay 11.3 across board. Here is a log and tune file. Im thinking I missed something in the tune. Maybe maxing a torque value out somewhere.
boostcut2.hptboostcut.hpl