I was looking up whether to go with bov for the gracious sound to be added to vtec wailing, or just go with a compressor bypass valve and reroute the air back in...

I read that a bov, although it makes a great sound, messes up your afr because the air sensor already sensed the air before going through the bov. So you lost the air that the air sensor sensed and the injectors are already squirting in enough fuel for that air you just gave off. In the end, leaving you rich for a bit....that's only on dsm's and other engines with a maf/mas right?

 

Correct.....

 

I did a search to learn more about this on google and I found this page: http://wwwrsphysse.anu.edu.au/...e.htm

It says "The bypass valve is open under normal low-load engine running conditions, and closes firmly when positive (boost) pressure is present in the inlet manifold (or plenum chamber). When on-boost and changing gear (throttle lift-off), a sudden lower pressure condition is created in the manifold and the valve is pulled open again, directing pressurised air back to the turbo inlet... I wonder if this could help spool by allowing the turbo to spin freely without the restriction of the engine until boost onset... or perhaps the vacuum created between the engine and the turbo already aids spool and perhaps opening the chamber before boost will delay spool??