BOV and BPV the same thing...
06-17-2008, 12:54 AM
#1
BOV and BPV the same thing... I been reading many post on what people think a BOV and BPV do. But what i get from wiki is that the two are the same. One just vents. Any one have any input on this? I want to use a BOV on a D1SC I would lke to use the HKS SSQV But people say that it will damage my head unit i would like to know how it would damage the headunit.
http://en.wikipedia.org/wiki/Bypass_valve
thanks
http://en.wikipedia.org/wiki/Bypass_valve
thanks
06-17-2008, 05:27 AM
#2
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
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
06-17-2008, 01:19 PM
#5
Why would you do that instead of just getting an appropriately sized BPV? 
I say just get the red ATI race BPV and be done with it. 
But as Bob stated- they are not the same. BPV's are always open until it starts to see boost. BOV's are closed all the time until they see a spike in backpressure...
I say just get the red ATI race BPV and be done with it. But as Bob stated- they are not the same. BPV's are always open until it starts to see boost. BOV's are closed all the time until they see a spike in backpressure...
06-17-2008, 07:37 PM
#6
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
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
Can you set the PSI to be very low IE idle speeds?
How would you make a BOV stay open untill it sees the boost?
Can you use a BOV and a BPV?
Reason why i ask is because i LOVE the sound off SWOOSH!!!!
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06-17-2008, 09:32 PM
#8
TECH Addict
you can vent the bypass if you wish to have noise.
if you try to run a blow off with real low opening pressure your car will chirp like a bird 90% of the time.
go with a mondo bypass and vent it and you will get the sound you want as well as keep your blower healthy
if you try to run a blow off with real low opening pressure your car will chirp like a bird 90% of the time.
go with a mondo bypass and vent it and you will get the sound you want as well as keep your blower healthy
06-17-2008, 11:31 PM
#10
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
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
06-17-2008, 11:45 PM
#11
I understood it well . I thought it was some good info
06-18-2008, 05:08 AM
#12
If you kept a blow off valve open until it sees boost, you wouldn't build up the pressure that creates that whoosh sound. You will hear a little of it with the ProCharger race Valve and the Vortech Mondo valve, especially if you are running a lot of boost, but certainly not like you would with a turbo. Bob
06-18-2008, 05:36 PM
#13
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In other words, only run a bpv with a SC beacouse it will surge the compressor and break stuff.
Bov's have a spring inside them, the BPV's do not or very small.
06-18-2008, 08:45 PM
#15
Why would you do that instead of just getting an appropriately sized BPV? I say just get the red ATI race BPV and be done with it.
But as Bob stated- they are not the same. BPV's are always open until it starts to see boost. BOV's are closed all the time until they see a spike in backpressure...
I say just get the red ATI race BPV and be done with it. But as Bob stated- they are not the same. BPV's are always open until it starts to see boost. BOV's are closed all the time until they see a spike in backpressure...
