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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
Posts: 24,705
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BOV orientation?
it seems that i remember some debate about this subject. what is the recommended orientation when installing the BOV?
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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08-31-2010, 02:56 PM
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That Guy
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?? Same as factory. Which valve are you putting in, a piston or diaphragm type?
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Jon 1988 Granite Green 911 3.4L 2005 Arctic Silver 996 GT3 Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1 |
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08-31-2010, 04:02 PM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
Posts: 24,705
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this one:
Pelican Parts - Product Information: 99-0609-100-M285 i installed it with the vacuum nipple straight up. is that correct?
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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08-31-2010, 04:06 PM
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All Spooled Up
Join Date: May 2009
Location: Between NE and Central PA
Posts: 2,516
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That should be correct. Port opposite the vac nip goes to intake.
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>gray 89 951S - K27/8, MAF, 3" intake, 3" exhaust w/separate waste pipe, 55# inj, late cam; >red 87 924S - chip, K&N, punched-out cat&muffler >black 80 924 - (sold) >maroon 77 924 - auto (sold) |
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08-31-2010, 04:13 PM
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That Guy
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Yes, install the valve the same way as the original Bosch one. The port on the side goes to the charge pipe, the bottom port goes to the j-boot.
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Jon 1988 Granite Green 911 3.4L 2005 Arctic Silver 996 GT3 Past worth mentioning - 1987 924S, 1987 944, 1988 944T with 5.7L LS1 |
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08-31-2010, 05:30 PM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
Posts: 24,705
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thanks, guys.
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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08-31-2010, 06:26 PM
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Super Moderator
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i installed mine backwards, so that in case the vac line ever fails the bov will still work pushing against the spring pressure.
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!) |
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09-01-2010, 07:26 AM
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On Boost
Join Date: Dec 2009
Location: Melbourne, AUS
Posts: 398
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Nize, thats pretty smart, though i tried this on the same bov, but to atmosphere since i have no MAF i have a MAP sensor. it makes a ptshh sound then straight after stupid whissle sound.
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86 952 GTX3076R, M-Tune, eBoost 2, CEP/JME cam, CEP head. |
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09-01-2010, 08:15 AM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
Posts: 24,705
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SEE, i KNEW someone had a different idea about this!
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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09-01-2010, 10:24 AM
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Got Turbo?
Join Date: Jun 2002
Location: Valley of the Sun
Posts: 446
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The action on the valve will not operate "accurately" if installed like Nize has it. Yes, the "muscle" air can push the valve open, but when the valve is being used, the spring rate is all that will close the valve and it will move too slow if the spring rate is below or close to the given boost setting.
The whistling that Paulyy heard is probably due to the valve dumping the charge air then coming to the closed position very slowly to where it whistles right before it fully seats. This slowed movment of the valve is because the charge air is still pushing on the bottom of the valve and the spring rate isn't strong enough to move it qiuckly to the closed position.
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Vic Timpauer - www.pauertuning.com Mesa, AZ 944 Turbo S - Plug & Play Vi-PEC V44 EMS, GT3076R DynaPack Dyno: 358whp/352lbft @ 18.5 psi 91 pump 438whp/430lbft @ 22.5 psi E85 |
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09-01-2010, 02:15 PM
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Super Moderator
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vic, due to the nipple vac line, i thought that when it was holding boost, the pressure on the bov action would be the manifold (or boost) pressure + spring pressure, thus there would always be enough pressure to close the valve, even with a weak spring.
conversely, when it's dumping i thought it would be vacuum + back pressure (or muscle air) which would jointly overcome the bov spring pressure.
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'89 turbo-s (2.7, wolf3d ems, garrett dbb turbo, tial 46mm, etc. fast!) |
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09-02-2010, 06:48 AM
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winter-hater club member
Join Date: Oct 2003
Location: salt lake city, utah
Posts: 24,705
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nize, i can see where you are coming from. i'll try it with that orientation and see if it makes any difference with A/F ration and/or butt dyno.
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2000 Corvette - ????, 2007 Buell XB9R - Astrid, 1996 Discovery - Piglet, 2000 Forester "COOL PRIUS!" - Nobody Ever |
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09-02-2010, 09:37 AM
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The Kraut Burner
The Bratwurst Burner
Das Boost
