Bypass valve: Difference between revisions

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Valve which relieves charge pressure by venting air back into the ambient pressure intake tract.
Valve which relieves charge pressure by venting air back into the ambient pressure intake tract.


Prevents [[turbo surge]] but preserves [[LTFT]]s, since measured air will still eventually enter the combustion chamber.
Prevents [[turbo surge]] but preserves [[LTFT]]s, since measured air will still eventually enter the combustion chamber. Controlled by the [[N249]] valve.


All street cars that use [[MAF]]s upstream of a charge pressure relief system should use BPVs rather than [[blow off valve]]s.
All street cars that use [[MAF]]s upstream of a charge pressure relief system should use BPVs rather than [[blow off valve]]s.

Part #16 (034 145 710 B) below:
[[Image:Charge_Air_Cooler-AGB%2CAZB.png]]

==OEM valves==
⚫
''work in progress, part numbers needed, should reformat into table''


Variants:
Variants:
⚫
(work in progress, part numbers needed, should reformat into table)


*710 original (OEM for 2000 6MT S4, <2000 A4/TT/Passat)
*710 original (OEM for 2000 6MT S4, <2000 A4/TT/Passat)
*710A 8.8lb spring (OEM for 2000 tiptronic S4, 2001+ S4, <2002 A4/TT/Passat)
*710A 8.8lb spring (OEM for 2000 tiptronic S4, 2001 S4, <2002 A4/TT/Passat)
*710B (OEM for S2?)
*710B (OEM for 2001.5+ S4, S2?)
*710C (OEM for Beetle?)
*710C (OEM for Beetle?)
*710G (14lb spring? some came in bags labled N?)
*710G (14lb spring? some came in bags labled N?)
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possible part numbers(?):
possible part numbers(?):
*06B-145-710A S4 2.7
*06B-145-710A/B [[Generations |S4 2.7t]]
*034-145-710A/B/C/N A4 1.8t, S2, Passat, Beetle
*034-145-710A/B/C/N A4 1.8t, S2, Passat, Beetle
*06A-145-710A/H/G/N/P TT 1.8t, RS6 4.2t
*06A-145-710A/H/G/N/P TT 1.8t, RS6 4.2t

[http://www.vagcat.com/epc/search/11/034145710B/ Vagcat] lists Bosch 0280142108 as an alternative.

===Orientation===
[http://www.modifieda4.com/web/misc/bpv.html Stock orientation is best.]

==Aftermarket valves==
''work in progress''
* Bailey
* Hyperboost
* Forge
* GoFastBits

[[Category:Bypass valves]]

Latest revision as of 17:29, 8 April 2008

a.k.a. "BPV" or "DV" (Diverter Valve)

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. Controlled by the N249 valve.

All street cars that use MAFs upstream of a charge pressure relief system should use BPVs rather than blow off valves.

Part #16 (034 145 710 B) below: Charge Air Cooler-AGB,AZB.png

OEM valves

work in progress, part numbers needed, should reformat into table

Variants:

  • 710 original (OEM for 2000 6MT S4, <2000 A4/TT/Passat)
  • 710A 8.8lb spring (OEM for 2000 tiptronic S4, 2001 S4, <2002 A4/TT/Passat)
  • 710B (OEM for 2001.5+ S4, S2?)
  • 710C (OEM for Beetle?)
  • 710G (14lb spring? some came in bags labled N?)
  • 710H ?
  • 710N 14lb spring (OEM for 2002 A4/TT)
  • 710P (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.

possible part numbers(?):

  • 06B-145-710A/B S4 2.7t
  • 034-145-710A/B/C/N A4 1.8t, S2, Passat, Beetle
  • 06A-145-710A/H/G/N/P TT 1.8t, RS6 4.2t

Vagcat lists Bosch 0280142108 as an alternative.

Orientation

Stock orientation is best.

Aftermarket valves

work in progress

  • Bailey
  • Hyperboost
  • Forge
  • GoFastBits
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