recirculating BOV
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Joined: Mar 2002
Posts: 40
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From: Texas
Vehicle: 2005 Tiburon
recirculating BOV
I have heard that a recirculating BOV is better/more efficient than an atmospheric one because it keeps a flowing cycle of air. Dont recirculated BOVs have an advantage of putting some pressure before the turbo and help it spool faster? 
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Joined: Jan 2008
Posts: 175
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From: Puyallup, WA
Vehicle: 2006 Kia Spectra5
Not more efficient, just different. Usually used on MAF based engines, with the MAF before the turbo.
If you used a standard BOV on a MAF based engine it would release the pressurized charge air to atmosphere. Problem with the MAF based engine is that the ECU is expecting a certain volume of air, because its already measured it. When the BOV releases it the car will go rich and could possibly stall out or have a stumble.
The recirculating BOV releases the charge back to the front of the turbo, but after the MAF. So the same measured charge of air is still available and engine doesn't stumble.
Has no effect on the turbo if sized right.
If you used a standard BOV on a MAF based engine it would release the pressurized charge air to atmosphere. Problem with the MAF based engine is that the ECU is expecting a certain volume of air, because its already measured it. When the BOV releases it the car will go rich and could possibly stall out or have a stumble.
The recirculating BOV releases the charge back to the front of the turbo, but after the MAF. So the same measured charge of air is still available and engine doesn't stumble.
Has no effect on the turbo if sized right.