Just pulled a tough hill, towing my about 17k 5ver, pushing it hard to get past a wide load truck and the turbo went to about 20,000 or so... pretty loud wind up noise that is new to me. Wondered if ...
Our V-10 has electric fans that kick on and off. Sounds like a plane alright. Most turbo's turn way more than 20,000 rpm. Not uncommon to be turning 120,000 to 140,000 rpm.