I currently run an AVCR boost controller and am having issues with boost taper. I currently run a ported green and am tuned for 93 at 25-26 psi. In this boost I end up tapering to 21 or so at redline and cannot for the life of me get it to hold better. I have checked for boost leaks and have none. I have tried upping the duty in the upper rpms, as well as upping the actual boost in the upper rpms and have had no luck. I have since moved to E85 and plan on runing 30psi. I do have the HP FP actuator on the turbo as well. Any ideas??

 

Btt