[Chuforia]

I was out in my buddies 996 last night. He just got it back from the shop after all kinds of fun work, new bigger turbos, changed gearing, etc etc. Anyway when he idles the lightened flywheel sounds absolutely terrible. Rattles like crazy. Our friend with a supercharged 997, his does the same.

I'm a pretty technical guy and have rebuilt all kinds of different engines, know the fundamentals and parts, etc, but I don't understand this. I'm sure someone here has the answer..please enlighten me.