[MOVOVR951]

Originally Posted by AaronM

Here's the thing: There's zero performance difference between a well sorted diverter valve setup and a well sorted BOV setup. None.

However, with a flapper-type AFM (or even a MAF), there's no way for the ECU to meter accurately when the valve does vent. The purpose of the diverter valve is to ensure that metered air does not escape from the manifold. Unless you're running a MAP sensor based ECU, there's no way to accurately meter for fuel when a BOV vents and you _will_ run rich during those times.

Your right, there is no performance gain. I never said there was one over durabilty. If anything one could argue that the bov tied back into the intake track will help spool the turbo faster. I choose to hear the sounds of the vehicle. I have had a track session where a vac line came loose and the first thing I noticed was the sound change from the bov.

Benefits/problems are nil for sure, as is the same with running (Maybe...) rich during upshifts or llifting whilst on boost. The very same kit I mentioned comes with bits to recycle it back in and I have run it both ways (just to satify all of the "end of the world" warnings and rumors. No differance in afrs were realized.... My 2 cents and worth only what was paid...