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Bypass Valve recommendations
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TECH Apprentice
Joined: Dec 2003
Posts: 319
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From: Tennessee
Bypass Valve recommendations I have been running the stock Bosch bypass valve, vented to atmosphere, on my Novi 2000 at 8 psi. I dropped in a forged 346 and plan to up the boost to about 14-15 psi. Based on what I have been reading the Bosch valve is problematic at this level. I have also done a lot of reading on bypass valves versus blow off valves. Some people say they are the same, others say they are different. I found this quote form Bob at EPP
"A bypass valve is always bleeding off boost until is sees close to zero vacuum, such as when going to wide open throttle. This way there is no load on the blower.
A blow off valve typically does not bleed off boost until a set psi is achieved, then it releases the pressure. A supercharger is always making boost, even at idle. If this boost is not vented off, it has to go somewhere when the throttle blade is closed shut. If it can't find a weak hose in the plumbing, it will try to slow the blower down, putting a strain on the blower as the blower is belt driven. A blow off valve can also cause supercharger belt slippage when letting off the throttle. Bob"
So I tend to believe the 2 valves operate differently. So what I need is a recommendation for a bypass valve for my system.I keep runnign across teh following names, but don't know one from the other.
Vortech Race Bypass Valve
Mondo Bypass Valve
Hyperboost DV
ATI Race Valve
Also I can barely hear my Bosch valve at 8 psi, so I would like a slightly louder valve and long as I dont sacrifice part throttle response and drive ability.
Thanks for the help
Chris
"A bypass valve is always bleeding off boost until is sees close to zero vacuum, such as when going to wide open throttle. This way there is no load on the blower.
A blow off valve typically does not bleed off boost until a set psi is achieved, then it releases the pressure. A supercharger is always making boost, even at idle. If this boost is not vented off, it has to go somewhere when the throttle blade is closed shut. If it can't find a weak hose in the plumbing, it will try to slow the blower down, putting a strain on the blower as the blower is belt driven. A blow off valve can also cause supercharger belt slippage when letting off the throttle. Bob"
So I tend to believe the 2 valves operate differently. So what I need is a recommendation for a bypass valve for my system.I keep runnign across teh following names, but don't know one from the other.
Vortech Race Bypass Valve
Mondo Bypass Valve
Hyperboost DV
ATI Race Valve
Also I can barely hear my Bosch valve at 8 psi, so I would like a slightly louder valve and long as I dont sacrifice part throttle response and drive ability.
Thanks for the help
Chris
Teching In
Joined: Jul 2008
Posts: 3
Likes: 0
i have never witnessed a loud bypass valve but id like to, i have a vortech v2 on my ss ute (australia), and have the supplied bosch by pass vented to atmosphere, alot of people down here use the mondos, but i cant imagine them having a nice blowoff valve sounds because as you said the bypass's are constantly bleeding, and boy did i learn learn that the hard way,
a supercharged v6 buick with a bov...
a supercharged v6 buick with a bov...
I have been running the stock Bosch bypass valve, vented to atmosphere, on my Novi 2000 at 8 psi. I dropped in a forged 346 and plan to up the boost to about 14-15 psi. Based on what I have been reading the Bosch valve is problematic at this level. I have also done a lot of reading on bypass valves versus blow off valves. Some people say they are the same, others say they are different. I found this quote form Bob at EPP
"A bypass valve is always bleeding off boost until is sees close to zero vacuum, such as when going to wide open throttle. This way there is no load on the blower.
A blow off valve typically does not bleed off boost until a set psi is achieved, then it releases the pressure. A supercharger is always making boost, even at idle. If this boost is not vented off, it has to go somewhere when the throttle blade is closed shut. If it can't find a weak hose in the plumbing, it will try to slow the blower down, putting a strain on the blower as the blower is belt driven. A blow off valve can also cause supercharger belt slippage when letting off the throttle. Bob"
So I tend to believe the 2 valves operate differently. So what I need is a recommendation for a bypass valve for my system.I keep runnign across teh following names, but don't know one from the other.
Vortech Race Bypass Valve
Mondo Bypass Valve
Hyperboost DV
ATI Race Valve
Also I can barely hear my Bosch valve at 8 psi, so I would like a slightly louder valve and long as I dont sacrifice part throttle response and drive ability.
Thanks for the help
Chris
"A bypass valve is always bleeding off boost until is sees close to zero vacuum, such as when going to wide open throttle. This way there is no load on the blower.
A blow off valve typically does not bleed off boost until a set psi is achieved, then it releases the pressure. A supercharger is always making boost, even at idle. If this boost is not vented off, it has to go somewhere when the throttle blade is closed shut. If it can't find a weak hose in the plumbing, it will try to slow the blower down, putting a strain on the blower as the blower is belt driven. A blow off valve can also cause supercharger belt slippage when letting off the throttle. Bob"
So I tend to believe the 2 valves operate differently. So what I need is a recommendation for a bypass valve for my system.I keep runnign across teh following names, but don't know one from the other.
Vortech Race Bypass Valve
Mondo Bypass Valve
Hyperboost DV
ATI Race Valve
Also I can barely hear my Bosch valve at 8 psi, so I would like a slightly louder valve and long as I dont sacrifice part throttle response and drive ability.
Thanks for the help
Chris
Trending Topics
Here is a vid of my car on the dyno. You can hear it but really doesn't do it justice. I thought my ears were gonna bleed in that little bay. And dogs go CRAZY when they here you coming.
http://www.youtube.com/watch?v=ks9BnD6Hjrg
http://www.youtube.com/watch?v=ks9BnD6Hjrg
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Verdad Gallardo Here is a vid of my car on the dyno. You can hear it but really doesn't do it justice. I thought my ears were gonna bleed in that little bay. And dogs go CRAZY when they here you coming.
http://www.youtube.com/watch?v=ks9BnD6Hjrg
http://www.youtube.com/watch?v=ks9BnD6Hjrg
I'm running an f1a and its not very loud, you can only hear the blower itself at idle. As soon as you touch the throttle the bypass starts screamin. I cant rev it at all when i'm under the hood, it kills my ears haha.
Yep, there is deffinately no hiding it haha! It makes a loud flutter when you get out of boost too, I like it! I had a guy flag me down in a neighborhood the other day cuz he thought "my rings were burning up" hahahahaha!
Yeah, that flutter sound is awesome, that's what my vortech race bypass used to do. I'm glad to hear this new one will too, just louder.
