Vacuum pulls it open....

 

so the vaccum on a wastegate will do the same when you close the throttle plate?

is this is ture everytime i let off the gas all the way the wastgate opens

 

Wastegate actuator is set to open at a certain pressure based on signal from the boost pressure solenoid, or if you have a pretty primitive system, it can he run on straight vacuum....

 

wastegate runs off boost..bov runs off manifold vacuum..

 

that makes more sensei understand now guys thanks, i was always under the impression BOV's opened from teh extra pressure when you close the throttle plate but it all makes sense now

 

im sure we all thought a bit along those lines when we were noobs, but if that was the case, the bov would be open all the time, there is no extra pressure when the throttle plate closes, it is just going in the opposite direction now.

 

Oh there is a pressure spike when you close the throttle. Have you ever had a responsive boost gauge pre-throttle?

 

thank you to everyone for their help!