Bypass valve
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a.k.a. "BPV"
Valve which relieves charge pressure by venting air back into the ambient pressure intake tract.
Prevents turbo surge but preserves LTFTs, since measured air will still eventually enter the combustion chamber.
All street cars that use MAFs upstream of a charge pressure relief system should use BPVs rather than blow off valves.
Variants: (work in progress, part numbers needed, should reformat into table)
- 710A - original? (OEM for 2001.5?)
- 710N - updated (OEM for which engine?)
- 710P - 06A 145 710 P updated again (OEM for RS6?). Has a reinforced silicone diaphragm, and has brass guides holding the sealing lip in alignment with the seat. The valve begins to open at ~ 6 in-HG vacuum.