...OKAY NOW IM CONFUSED ABOUT BOV & BYPASS VALVE
...OKAY NOW IM CONFUSED ABOUT BOV & BYPASS VALVE
Okay... so im doing and SC setup. I am reading Mr. Bell's Supercharging articles and a few times the use of a bypass valve came up.
At first I thought it was like the BOV which at say whatever PSI you set it to, it would vent the air so the boost PSI doesnt go past that set limit/ also vents to reduce comp. surge when TB is closed during shifting etc.
However as I read the articles more clearly , the bypass valve Mr. Bell mentioned also stayed open and vented under vaccume, until heavy throttle action and onset of boost would cause it to close the bypass until it got to the point where it needed to vent again due to High PSI/ gear shift(TB closure).
while staying open and venting in the lower rpms where we dont see much boost with SC i.e. when crusing etc. the blower has to fight less psi buildup and thus apparantly reduced the lower end power robbing by from 1hp to 1/4hp(something like that.. i dont remember the exact #) but the idea is to only close the vent when accelerating or heavy throttle.
a link to such a device included below. please clarify is this the smae function of the bosch one that is provided with the stillen kit? or is that like a BOV...
Im confused.. and the underlines part just confused me even more... oh boy...
http://www.magnusonproducts.com/bypass.htm
you guys have any experience with this? not SCing but the valve. Im trying to do a SC build with good reponse throughout the rpm range. Its going to be a truly custom build but I keep ending up with confusion becuase of either misused terminology or toomuch info on the net.
At first I thought it was like the BOV which at say whatever PSI you set it to, it would vent the air so the boost PSI doesnt go past that set limit/ also vents to reduce comp. surge when TB is closed during shifting etc.
However as I read the articles more clearly , the bypass valve Mr. Bell mentioned also stayed open and vented under vaccume, until heavy throttle action and onset of boost would cause it to close the bypass until it got to the point where it needed to vent again due to High PSI/ gear shift(TB closure).
while staying open and venting in the lower rpms where we dont see much boost with SC i.e. when crusing etc. the blower has to fight less psi buildup and thus apparantly reduced the lower end power robbing by from 1hp to 1/4hp(something like that.. i dont remember the exact #) but the idea is to only close the vent when accelerating or heavy throttle.
a link to such a device included below. please clarify is this the smae function of the bosch one that is provided with the stillen kit? or is that like a BOV...
Im confused.. and the underlines part just confused me even more... oh boy...
http://www.magnusonproducts.com/bypass.htm
you guys have any experience with this? not SCing but the valve. Im trying to do a SC build with good reponse throughout the rpm range. Its going to be a truly custom build but I keep ending up with confusion becuase of either misused terminology or toomuch info on the net.
Last edited by HomerMAC; Apr 11, 2010 at 08:41 PM.
Okay... so im doing and SC setup. I am reading Mr. Bell's Supercharging articles and a few times the use of a bypass valve came up.
At first I thought it was like the BOV which at say whatever PSI you set it to, it would vent the air so the boost PSI doesnt go past that set limit/ also vents to reduce comp. surge when TB is closed during shifting etc.
Here it looks like you're confusing the Blow off valve [BOV] with the wastegate. A wastegate is placed before the hot side of a turbo. It opens when the turbo sees a certain psi usually by way of a spring. This is what controls the boost psi on a turbocharged setup. You wont need it for a supercharged setup because psi in this form is controled by the size of the pulley you're running and RPM.
The BOV is placed inline with the charge piping on a TC or SC setup. When you build boost and your throttle cable slams shut, that built up boost is still in the charge pipe and needs somewhere to go. The BOV vents it into the atmosphere. (or recirculates it in some cases)
However as I read the articles more clearly , the bypass valve Mr. Bell mentioned also stayed open and vented under vaccume, until heavy throttle action and onset of boost would cause it to close the bypass until it got to the point where it needed to vent again due to High PSI/ gear shift(TB closure).
while staying open and venting in the lower rpms where we dont see much boost with SC i.e. when crusing etc. the blower has to fight less psi buildup and thus apparantly reduced the lower end power robbing by from 1hp to 1/4hp(something like that.. i dont remember the exact #) but the idea is to only close the vent when accelerating or heavy throttle.
a link to such a device included below. please clarify is this the smae function of the bosch one that is provided with the stillen kit? or is that like a BOV...
Im confused.. and the underlines part just confused me even more... oh boy...
http://www.magnusonproducts.com/bypass.htm
you guys have any experience with this? not SCing but the valve. Im trying to do a SC build with good reponse throughout the rpm range. Its going to be a truly custom build but I keep ending up with confusion becuase of either misused terminology or toomuch info on the net.
At first I thought it was like the BOV which at say whatever PSI you set it to, it would vent the air so the boost PSI doesnt go past that set limit/ also vents to reduce comp. surge when TB is closed during shifting etc.
Here it looks like you're confusing the Blow off valve [BOV] with the wastegate. A wastegate is placed before the hot side of a turbo. It opens when the turbo sees a certain psi usually by way of a spring. This is what controls the boost psi on a turbocharged setup. You wont need it for a supercharged setup because psi in this form is controled by the size of the pulley you're running and RPM.
The BOV is placed inline with the charge piping on a TC or SC setup. When you build boost and your throttle cable slams shut, that built up boost is still in the charge pipe and needs somewhere to go. The BOV vents it into the atmosphere. (or recirculates it in some cases)
However as I read the articles more clearly , the bypass valve Mr. Bell mentioned also stayed open and vented under vaccume, until heavy throttle action and onset of boost would cause it to close the bypass until it got to the point where it needed to vent again due to High PSI/ gear shift(TB closure).
while staying open and venting in the lower rpms where we dont see much boost with SC i.e. when crusing etc. the blower has to fight less psi buildup and thus apparantly reduced the lower end power robbing by from 1hp to 1/4hp(something like that.. i dont remember the exact #) but the idea is to only close the vent when accelerating or heavy throttle.
a link to such a device included below. please clarify is this the smae function of the bosch one that is provided with the stillen kit? or is that like a BOV...
Im confused.. and the underlines part just confused me even more... oh boy...
http://www.magnusonproducts.com/bypass.htm
you guys have any experience with this? not SCing but the valve. Im trying to do a SC build with good reponse throughout the rpm range. Its going to be a truly custom build but I keep ending up with confusion becuase of either misused terminology or toomuch info on the net.
The bypass valve they are describing looks like it's used to keep a SC out of boost in light throttle situations. Similar to keeping a turbo out of boost. From what I know, it's real useful for getting good gas milage since your not constantly forcing extra air through the engine at low RPMs like you would without this.
Someone correct me if im wrong.
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