BOV
Hotshot
Joined: Jul 2008
Posts: 11,231
Likes: 130
From: Thomasville, GA
When I accelerate hard and then let off the gas while it's at high boost I get a "whoosh" from under the hood... maybe back out the intake?
I've heard that can damage the turbo, which makes me wonder where the extra boost goes...
OT: Zixxer, how does your remote start work? Do you have a way to just turn the glowplugs on and then start it?
I've heard that can damage the turbo, which makes me wonder where the extra boost goes...
OT: Zixxer, how does your remote start work? Do you have a way to just turn the glowplugs on and then start it?
Senior User
Joined: Nov 2009
Posts: 142
Likes: 2
From: MO
When I accelerate hard and then let off the gas while it's at high boost I get a "whoosh" from under the hood... maybe back out the intake?
I've heard that can damage the turbo, which makes me wonder where the extra boost goes...
OT: Zixxer, how does your remote start work? Do you have a way to just turn the glowplugs on and then start it?
I've heard that can damage the turbo, which makes me wonder where the extra boost goes...
OT: Zixxer, how does your remote start work? Do you have a way to just turn the glowplugs on and then start it?
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Logistics Pro
Joined: Jan 2005
Posts: 4,129
Likes: 4
From: Brandon, MB
BOV's aren't necessary for our trucks. That's probably why nobody uses them. They are for surge protection (when the pressure differential between suction and discharge pressures is too great for the turbine wheel to overcome. From too high discharge pressure and/or too low suction pressure.) On gassers, this is important as there's vacuum to deal with.
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Hotshot
Joined: Jun 2007
Posts: 10,008
Likes: 7
From: Austin, TX
BOV's aren't necessary for our trucks. That's probably why nobody uses them. They are for surge protection (when the pressure differential between suction and discharge pressures is too great for the turbine wheel to overcome. From too high discharge pressure and/or too low suction pressure.) On gassers, this is important as there's vacuum to deal with.
Lead Driver
Joined: Jul 2007
Posts: 5,715
Likes: 1
i know a few 6.0 guys who have a BOV, but they are running compound turbos and mind boggling boost numbers that wastegates alone cant control. the BOV prevents the boost creep at bay after the waste gates are opened entirely.
modded cummins B's are a bit more boost happy than our 7.3's, so i could see how a BOV might be a popular add-on for them. i would venture to say that most people who have them dont need them but they dont hurt anything, they just will never open.
gassers need some blow off protection because there is a large mass of air ripping through the intake tract that SLAMS to a stop when the throttle plates close. vacuum has nothing to do with it, other than its used to actuate some BOV's on gassers. the smart guys run an internally recirculated BOV that bleeds the boost pressure off into the exhaust side to keep the turbine spinning during shifts.
modded cummins B's are a bit more boost happy than our 7.3's, so i could see how a BOV might be a popular add-on for them. i would venture to say that most people who have them dont need them but they dont hurt anything, they just will never open.
gassers need some blow off protection because there is a large mass of air ripping through the intake tract that SLAMS to a stop when the throttle plates close. vacuum has nothing to do with it, other than its used to actuate some BOV's on gassers. the smart guys run an internally recirculated BOV that bleeds the boost pressure off into the exhaust side to keep the turbine spinning during shifts.
Logistics Pro
Joined: Jan 2005
Posts: 4,129
Likes: 4
From: Brandon, MB
Aaron, I think you may be right about the vacuum. Got thinking about it and the placement of the throttle plate in the system. That being the downstream (higher pressure) side of the turbo and vacuum on the downstream side of that. On the other hand, the principle of pressure differential induced turbine surge still stands. When the throttle plate slams shut and stops the flow, the turbo is still pushing and has no place to push to. Also, the exhaust turbine is still being driven by the exhaust flow which has slowed, but not stopped. It's not that the turbo stops spinning, it actually achieves overspeed which can be catastrophic if it's really bad due to lack of load (forward flow) on the turbine wheel itself. This is actually a reversal of flow past the turbine wheel if only for a very short time. Sorry for the long post. I really enjoy this stuff. Haven't worked directly with turbines in a couple years, but I really enjoyed it when I did. Thanks for gettin' the ol' bean rolling. 
And, I hope it made sense.....
And, I hope it made sense.....
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