I've read that the correct procedure requires a belt tensioning meter that checks the natural frequency of the belt. I've read that the belt should be initially tensioned to 75 Hz and after break-in should read no more than 50 Hz.
Here's an example of the special meter. They are very expensive.
http://www.gates.com/products/industrial...and-accessoriesIt might be useful if someone with a freshly factory tightened belt use a fish scale and a ruler to measure the force vs deflection of the belt. That's a quick and easy way to do it.
