15+ Year Contributor
- Aug 8, 2004
I just installed my brand new Tial 50mm BOV with an 11psi spring. A couple of things I noticed. 1 thing is the BOV makes barely any noise. I know its supposed to make a nice loud *BOP* type of noise. Im like ? It sounds like it does a mini compressor surge and then a little hiss. Also, my vacuum use to sit at 20hg/in at 750rpm. Now it sits at 17-18 at 800rpm. Anything would be helpful.