I have my stock bosch valve going to atmosphere right now until I get a decent hose to the turbo and at idle it's open a bit. Well it seems a lot. Capping it with my hand or thumb makes the idle drop quite a bit.

Normal?

 

Thats normal on all dump valves, exept dual pistons valves, which you have to use on cars whit air flow meter

 

Thanks, this is my first speed density turbo car, the vacuum seemed normal etc.