Quote:
Originally posted by kach22i
My comment was tongue-n-cheek, but I did not know what the sound was.
Thank you for the quick turbo lesson, I just learned something.
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I wasn't sure if you were joking or not. I thought everyone knew what a blow off valve was these days with all the tuner imports on the road.
Yes, its a loud and annoying sound but when I am Autocrossing (and on track days) it is necessary.
Once I let my foot off the throttle the the butterflies on my throttle body close it creates a blockage in the flow from the turbo to the engine. This will cause backpressure on the turbo and it will slow down a lot trying to fight the backflow. By releasing the pressure (blow off valve) it lets the turbo spin free until I open the throttle again. Then the BOV will close and the turbo is already spinning at close to full RPM's and ready to give me full boost in a fraction of a second.
So I will gladly take the noise with the performance gain.
Also in the 1st clip the cam corder was mounted on the front hood right next to the BOV on a sticky pod.