Anyone know at what RPM the boosters should come on? I free rev the engine as high as 3300rpm and hold it there, the boosters are not on and I thought they would be as I found my 4150/850 the boosters come on at 2800rpm on my 408.

http://www.youtube.com/watch?v=aIxaesJ190U

http://youtu.be/lCZAaN7fFLg