[jusmx141]

That video does not display compressor surge.

Compressor surge occurs under boost- NOT under vacuum. The car in that vid simply has too much blow off valve tension for the low (7 psi) boost they are running. What you are hearing is blow off valve flutter- the airflow is trying to force it's way out of the valve, but the high spring tension is not letting it. This is basically rendering the function of the blow off valve to be useless by keeping too much pressure in the piping, and will eventually damage the turbo.

My buddy's Powerstroke Diesel used to surge a lot when he would lug the engine down in a higher gear. The turbo would be making full boost (somewhere around 28-30psi) at an RPM where the engine couldn't make use of the airflow the turbo is producing. The pressurized air would back up in the piping, and you would hear a sound through the intake that sounded much like the blow off valve on the car in that video, only it would happen under boost, like this:



...and this vid, of a Skyline with horrible surge:



If what you're hearing is blow off valve flutter, your valve's tension is simply too strong for your boost level.