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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > IS YOUR BOV open or closed???



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      12-31-2008, 01:25 PM   #1
Diesel///M
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IS YOUR BOV open or closed???

when your car is on and idle does your bov's stay open or closed????
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      12-31-2008, 06:23 PM   #2
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does anyone have a bov??? or does everyone have dv's
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      12-31-2008, 06:25 PM   #3
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Quote:
Originally Posted by Diesel335i View Post
when your car is on and idle does your bov's stay open or closed????

Your BOV makes the woosh sound when it "opens" to release the air...
So while your idle it should be closed.
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      12-31-2008, 07:15 PM   #4
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it's supposed to be open under vacumm (idle)
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      12-31-2008, 08:22 PM   #5
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It opens during boost...
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      12-31-2008, 08:39 PM   #6
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1clean335i has the aa bov and charge pipe and his stays open.. another friend has the greddy and it stays shut ..?? i have no idea which its suppose to be lol
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      12-31-2008, 09:57 PM   #7
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it should be closed on idle.
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      12-31-2008, 10:39 PM   #8
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Quote:
Originally Posted by veightkiller View Post
it should be closed on idle.
+1
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      01-01-2009, 12:49 PM   #9
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lol it amazes me how little people know about what they're so confident to write about.

A bov releases pressure, plain and simple. It does this by being pulled open by a preset vaccum pressure from the engine (when the engine isn't under load, i.e. under decelleration, idle.) The correct vaccum pressure for a bov for any engine is that of which it idles at.

All of this means that a bov should be at least slightly open under idle and anytime the throttle is qucikly released, causing the engine vaccum to increase to the point that is the same as it is at idle or greater
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      01-01-2009, 12:57 PM   #10
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Quote:
Originally Posted by Holeshot View Post
lol it amazes me how little people know about what they're so confident to write about.

A bov releases pressure, plain and simple. It does this by being pulled open by a preset vaccum pressure from the engine (when the engine isn't under load, i.e. under decelleration, idle.) The correct vaccum pressure for a bov for any engine is that of which it idles at.

All of this means that a bov should be at least slightly open under idle and anytime the throttle is qucikly released, causing the engine vaccum to increase to the point that is the same as it is at idle or greater
glad me and you are on the same page
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      01-01-2009, 01:21 PM   #11
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      01-01-2009, 02:17 PM   #12
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thanx to everyone that has posted
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      01-01-2009, 08:43 PM   #13
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i have an aa bov and i rcently installed my boost gauge im not gettin full boost.. Ad mine stays open im gettin a leak i hear air leakin but donno where =[
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      01-01-2009, 08:49 PM   #14
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Quote:
Originally Posted by nebz View Post
i have an aa bov and i rcently installed my boost gauge im not gettin full boost.. Ad mine stays open im gettin a leak i hear air leakin but donno where =[
Get rid of that BOV already!!! Install the DVs and you should be golden!
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      01-01-2009, 09:36 PM   #15
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lol i got DVs already just waiting for the shop to be done with my car then the DVs are on!
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      06-12-2009, 07:57 PM   #16
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Quote:
Originally Posted by nebz View Post
i have an aa bov and i rcently installed my boost gauge im not gettin full boost.. Ad mine stays open im gettin a leak i hear air leakin but donno where =[
Are you saying your bov stays open when idle or when you are boosting? If its under idle its suppose to stay open. If its open under boost then your bov is faulty, boost is what holds a bov close.
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      06-12-2009, 09:38 PM   #17
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When accelerating the bov stays closed,when you let off the gas and the throttle plate closes,like in between shifts it vents the excess boost either into the atmosphere (bov) or back into the intake (DV).A Diverter Valve is not the samething as a BOV,even though they are always called the samething.A BOV vents to the atmosphere,and a Diverter valve vents back into the intake tube.I think i got that right.
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      06-13-2009, 12:33 AM   #18
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I have an HKS Racing SSQ and its shut during idle and hold boost just fine.
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      06-13-2009, 11:32 AM   #19
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My AA is open at idle. Closes on load, and opens at off throttle to release the excess pressure.

Had also forge dv before, but I am happy with my AA!!
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      06-13-2009, 01:20 PM   #20
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Quote:
Originally Posted by Holeshot View Post
lol it amazes me how little people know about what they're so confident to write about.

A bov releases pressure, plain and simple. It does this by being pulled open by a preset vaccum pressure from the engine (when the engine isn't under load, i.e. under decelleration, idle.) The correct vaccum pressure for a bov for any engine is that of which it idles at.

All of this means that a bov should be at least slightly open under idle and anytime the throttle is qucikly released, causing the engine vaccum to increase to the point that is the same as it is at idle or greater
whether it is open or closed at idle is totally dependant on the spring pressure vs valve piston size. what opens the valve is the pressure differential between the pressure in the charge pipe and the vacuum from the post throttle body vacuum port vs spring pressure. the valve should stay closed while under full throttle boost and blow off under decel or shifting. all valves are different and the spring selection needs to be tuned to accomplish the above, many times you can accomplish the above with the valve either open or closed at idle. The spring TUNING comes in under spool if you datalog lag or hear air escaping as you start going wide open throttle.

-on some of the race cars I have built running 30-45 psi we actually needed to use very hard spring AND run the typical vacuum source(for decel/shifting blow off) with 2 check valves and a Y fitting with the pressure source coming right after the turbo(before any pressure drops due to intercooler and TB restrictions) OPPOSITE OF THIS we had to use a VERY light spring on our twincharger(turbo into supercharger) systems as we needed to vent any positive pressure under part throttle prior to the supercharger and a vacuum reference prior to the roots blower and a pressure reference post blower.

Last edited by TurboBullett@Ambient Thermal Management; 06-13-2009 at 04:05 PM.
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      06-14-2009, 04:14 AM   #21
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pretty pictures, thanks for the illustration
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