Originally Posted by jsisabella
OK, but why do they pop off????
I am not playing dumb here - I really have no idea....
you can put me in the corner with the dunce cap, if I should know this!!!
:-)
A BOV releases pressure built up by a turbo. When you switch gears or suddenly let off the throttle in a turbo charge vehicle, the RPM's drop and the boost that has built up has to be released. The Blow off valve is what allows this to happen. It is considered "cool" to have a loud BOV. Many people who drive WRX's, STi's, SRT-4's and the like, switch out their stock BOV for one that makes more SWOOSH. They do sound pretty neat.