not sure, I was using EcuTek for tuning and logging and I know for a fact that the logging worked correctly for both intake and exhaust cams... I don't recall though if it was just one or both that would not respond around idle, but I think it was not limited to idle but also very low rpm and load.... I'm gonna have to go dig up some logs and such cause now I'm curious. I do recall I figured it out because the changes were not having any noticeable affect...

 

Hmm odd but I do believe the exhaust cam retard works at idle. I improved my cold start idle by retarding exhaust 10 degrees. Anyone else care to chime in?