Whats a bypass valve?
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Joined: Sep 2004
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Blow off valves are found on cars with superchargers. Bypass valves are on cars with turbos. They both serve the same purpose, but a Bypass valve can throttle, where a blow-off valve is either fully open or fully closed.
On a Turbo, the bypass valve can be programmed to allow a pre-determined amount of boost. This means that you can actually change the amount of boost by doing nothing more then changing the program.
I have seen where bypass valves have been adopted for Superchargers which is really cool as they allow you to change boost w/o changing the pulley.
Blow off valves are found on cars with superchargers. Bypass valves are on cars with turbos. They both serve the same purpose, but a Bypass valve can throttle, where a blow-off valve is either fully open or fully closed.
On a Turbo, the bypass valve can be programmed to allow a pre-determined amount of boost. This means that you can actually change the amount of boost by doing nothing more then changing the program.
I have seen where bypass valves have been adopted for Superchargers which is really cool as they allow you to change boost w/o changing the pulley.
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Member
Joined: Aug 2007
Posts: 47
Sort of.
Blow off valves are found on cars with superchargers. Bypass valves are on cars with turbos. They both serve the same purpose, but a Bypass valve can throttle, where a blow-off valve is either fully open or fully closed.
On a Turbo, the bypass valve can be programmed to allow a pre-determined amount of boost. This means that you can actually change the amount of boost by doing nothing more then changing the program.
I have seen where bypass valves have been adopted for Superchargers which is really cool as they allow you to change boost w/o changing the pulley.
Blow off valves are found on cars with superchargers. Bypass valves are on cars with turbos. They both serve the same purpose, but a Bypass valve can throttle, where a blow-off valve is either fully open or fully closed.
On a Turbo, the bypass valve can be programmed to allow a pre-determined amount of boost. This means that you can actually change the amount of boost by doing nothing more then changing the program.
I have seen where bypass valves have been adopted for Superchargers which is really cool as they allow you to change boost w/o changing the pulley.
Member
Joined: Oct 2007
Posts: 53
...i thought it was the other way around.....blow off valves being more used for turbo applications...just fully open or closed to release pressure in the intake housing before the throttle plate....
no clue though, could be wrong....not much of a forced induction kinda guy.
no clue though, could be wrong....not much of a forced induction kinda guy.
Haul ass on regular gas
Joined: Oct 2006
Posts: 2,149
From: San Diego, CA and Boca Raton, FL
...i thought it was the other way around.....blow off valves being more used for turbo applications...just fully open or closed to release pressure in the intake housing before the throttle plate....
no clue though, could be wrong....not much of a forced induction kinda guy.
no clue though, could be wrong....not much of a forced induction kinda guy.
and i thought it was kinda like a waste gate on a turbo or in the case of the vortech s/c
Senior Member
Joined: Mar 2006
Posts: 530
From: cleveland, ohio
...i thought it was the other way around.....blow off valves being more used for turbo applications...just fully open or closed to release pressure in the intake housing before the throttle plate....
no clue though, could be wrong....not much of a forced induction kinda guy.
no clue though, could be wrong....not much of a forced induction kinda guy.
Administrator
Joined: Sep 2004
Posts: 6,613
ohhh wow ok so thats why boost controler is for right? It controls the bypass valve for turbos? I allways wundered how you are suppose to control the boost from a turbo. Ok well I have a vortech... not on yet but I was told to ditch the bosch bypass valve for somthing better... so I'll prolly go with a blow off valve either way. Any recomendations? I found some on ebay for like ahhh $80 shipped, but I have a feeling somones gonna tell me they are ****. Wanna make sure first though.
Whatever you do, you should stick with a standard valve arrangement for your supercharger. I only know of one supercharger where a wastegate was used to program the boost.
To make this work, you get a smaller pulley for more boost, but then limit the boost with the waste gate. This allows the boost to come on sooner which is awesome. Rather then the boost increasing with rpms, it stays the same. I really like the concept of doing this, but I am not sure you will find a tuner comfortable with the arrangement.
Senior Member
Joined: Nov 2004
Posts: 3,842
From: Pinole, Ca
actually it was custom and probably not worth the cost either. hey, it was a cool idea though. ingenuity is what i call it.
bypass valves only lets pressure off when there is a vacuum on your engine.
blow off valve has a spring that bleeds air off at certain boost levels.
bypass valves only lets pressure off when there is a vacuum on your engine.
blow off valve has a spring that bleeds air off at certain boost levels.
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