Originally Posted by Stu @ M Developments

For all those who think it makes the turbo last longer, Consider this:

When you are running 30Psi, the compressor has a 30psi restriction against it and is being forced to spin via the airflow at the Turbine which it is connected to.

When we back of, there is no longer any airflow at the turbine and thus, the turbo begins to slow down.

If we have a dump valve the pressure escapes through it with a "hisssssss" if we dont, the air escapes back through the compressor housing with a "Warble" as it rushes through the spinning compressor...

The max compressor load in each case is still 30psi