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Guys, a few of you are off base on this issue. The BPVs recirculate air back to the intake side of the compressor wheel. This air has already been measured as it has gone through the system. Some of you are concerned about losing some of this "metered air" when using a BOV and the engine going "rich". Well, using that logic, have you thought about this metered air with a BPV going back through the intake system a second time....the MAF doesn't register it because it reenters after the MAF....would the engine then "go lean"?? I don't think that this small amount of air is really going to matter, because it is just a flash. Also, I read the concern about air going back through to the MAF....think about it,,,if that was a concern, it would be more of a concern when using a BPV because the air out of the BPV goes right back into the intake system between the compressor intake wheel and the MAF. Ok...a tip for THOSE OF YOU WHO WANT TO TRY IT!!....(might through a code). Pull the hose off of your BPV that goes back into the intake...meaning the rubber hose that "Ys" into the intake system. Plug the hose with something (a 1" piece of an old broom handle, anything that will seal it). Start the engine and see if it will idle and how rough it might be. Rev it up with the help of a friend while you observe. Put your hand over the exposed opening of the BPV and see if you can feel air coming out...you should. Now, clamp off both of the small lines going into the top of each BPV with something,,,pliers, c clamp, anything to shut off the vacuum going to the valve which will cause it to close...Does the air stop coming out and does the engine smooth out?? This may explain why some trying BOVs may have had problems....the valve was open at idle. I hope that these threads are informative. Keep in mind that I am not advocating anyone to go to BOVs, but merely trying to clear up some misinfomation about them. There is no real mystery to them. The BPV is a better system for everyday driving from certain stanpoints....but the BOV is better for total performance under certain applications.
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