Thought on Blow Off Valves

mytmousemalibu

Cut your ride, sissy!
Apr 12, 2008
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:D Love mine too! Bought it for the protection, sound is a cool benifit! Really turns heads, that sound coming from a diesel truck:eek: I let her purge coming out of the burnout box at the track and everytime, i hear a unanimous, "Oh Sh!t!!!!" from the grandstands:D:rofl: = Priceless!

Mines the BD kit. Ya it costs alot but the nice PCM functionability/tuneability of it is nice!;)
 

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TrentNell

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Jul 7, 2008
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I've heard of people running drive pressure into the top of a BOV and using that to hold it closed. When drive pressure drops significantly below boost, it allows the valve to open. I think there is a little tuning with different springs involved, but it would be much cheaper than the other alternatives out there if it works.

sounds like a good idea , how much heat comes off the drive pressure line , arent blow off valves diaphram based and what material is the diaphram made of ?
 
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JoshH

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sounds like a good idea , how much heat comes off the drive pressure line , arent blow off valves diaphram based and what material is the diaphram made of ?
As far as I know, they do have a diaphragm, but I'm not 100% sure on that. I don't think the heat would be a big deal. You could coil some copper or aluminum tubing to dissipate any excess heat. I would be more concerned about soot plugging the tube.
 
Jun 28, 2007
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BOVs are :gay: They are ment for when the throttle body closes fast on a gasser and the turbo has no where to go.....so the turbo stalls. Yes its rough on the turbo but I rather rebuild my turbo once a year than have a BOV on anything I own. My buick stalls the turbo hard when I get out of it and makes it shutter for several seconds, but like I said I'll rebuild it befor I sound like a honda;)
 

JoshH

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BOVs are :gay: They are ment for when the throttle body closes fast on a gasser and the turbo has no where to go.....so the turbo stalls. Yes its rough on the turbo but I rather rebuild my turbo once a year than have a BOV on anything I own. My buick stalls the turbo hard when I get out of it and makes it shutter for several seconds, but like I said I'll rebuild it befor I sound like a honda;)
It's meant to keep from barking and damaging the turbo. I guess I fail to see how not wanting to screw up a turbo is gay.
 
Jun 28, 2007
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It's meant to keep from barking and damaging the turbo. I guess I fail to see how not wanting to screw up a turbo is gay.

barking is stalling

the sound is gay, reminds me of the fast and the furious. If I ever did run one I would vent it back into the trubo inlet so it wouldnt be heard;)
 
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mytmousemalibu

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These TiAL's dont sound ricey....No chattering, no whistling, just a loud ptsssssssssh, like if you stab a hole in an empty paint can and the pressure blasts out, kinds noise.
 

Turbotug

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Sep 3, 2006
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I can get my HTT to bark during shifts with moderate throttle ..

BOVs are a good thing. Saves turbos and should help keep wheel speed up.
 

JoshH

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barking is stalling

the sound is gay, reminds me of the fast and the furious. If I ever did run one I would vent it back into the trubo inlet so it wouldnt be heard;)
I realize that, but the way you wrote it, it sounded like you were saying that a diesel didn't need a BOV. I think parts that serve no purpose are gay. I don't see how something that is useful could be considered gay. To each his own, I guess.

I think if I put one on my truck, I'd vent it into the downpipe.
 

super diesel

<<<< Under Pressure
BOVs are :gay: They are ment for when the throttle body closes fast on a gasser and the turbo has no where to go.....so the turbo stalls. Yes its rough on the turbo but I rather rebuild my turbo once a year than have a BOV on anything I own. My buick stalls the turbo hard when I get out of it and makes it shutter for several seconds, but like I said I'll rebuild it befor I sound like a honda;)

Ever hear a I/C tube blow off in the middle of a pull? Same sound. Not ricer at all unless you get the ones with the amplifying little horn on it to sound like a gasser. You shoud try this TB6 :cool2:.
 
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super diesel

<<<< Under Pressure
i have read that a guy with a cummins used exhaust psi and boost psi to make the bov work

Opps. Cats out. This is the tests were doing now to see how well it works. It's a closed system folks (no gasses going through the blow off). The diaphram is a high heat design (Phanalic, Mylar or similar material). It has to endure the temps from the pre I/C as is which can get pretty high on a big pressure run. I'll post up finding when done.
 

TrentNell

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Opps. Cats out. This is the tests were doing now to see how well it works. It's a closed system folks (no gasses going through the blow off). The diaphram is a high heat design (Phanalic, Mylar or similar material). It has to endure the temps from the pre I/C as is which can get pretty high on a big pressure run. I'll post up finding when done.

hopefully it works out it would great to have a more afordable option :)
 

RENODMAX

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Mar 4, 2008
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BOVs are :gay: They are ment for when the throttle body closes fast on a gasser and the turbo has no where to go.....so the turbo stalls. Yes its rough on the turbo but I rather rebuild my turbo once a year than have a BOV on anything I own. My buick stalls the turbo hard when I get out of it and makes it shutter for several seconds, but like I said I'll rebuild it befor I sound like a honda;)

Drive around with a bigger single charger that you spent hard earned money on and well revisit this statement
 
Jun 28, 2007
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I guess the real point is are they needed? They would be far more useful on a gasser because they will stall a turbo much harder and quicker than a diesel will. Can anyone prove that they had a charger failed from stalling it?

Heres a test to see if you really need one. Put a boost gauge near the turbo on a gasser and jump out of the throttle quick and see what it goes to....it will spike much higher than your peak boost number. Now put a boost gauge near the trubo on a diesel and jump out of the throttle and see what it does.

BOVs were originaly made for stick cars so that the turbo wouldnt stall durring shifts. When I had a stick diesel I could easly shift and get back into it befor the gauge would go below 10 pounds.
 
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dmaxvaz

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Nov 22, 2006
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I guess the real point is are they needed? They would be far more useful on a gasser because they will stall a turbo much harder and quicker than a diesel will. Can anyone prove that they had a charger failed from stalling it?

Heres a test to see if you really need one. Put a boost gauge near the turbo on a gasser and jump out of the throttle quick and see what it goes to....it will spike much higher than your peak boost number. Now put a boost gauge near the trubo on a diesel and jump out of the throttle and see what it does.

BOVs were originaly made for stick cars so that the turbo wouldnt stall durring shifts. When I had a stick diesel I could easly shift and get back into it befor the gauge would go below 10 pounds.
my close friend snapped an exhaust wheel right off the turbine shaft off a brand new industrial injection silver bullet because he barked the turbo a couple times in like 10 minutes. having a blowoff valve would have prevented this. i think they are a little more useful on a diesel, especially on a single turbo setup, twin turbo setups are more forgiving and might not need it as much
 
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Jun 28, 2007
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my close friend snapped an exhaust wheel right off the turbine shaft off a brand new industrial injection silver bullet because he barked the turbo a couple times in like 10 minutes.

How did you come to this conclusion? Sounds more like a manufacturing defect to me. If barking a new turbo for 10 min breaks shafts I think we would see far more failures.
 
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