BOV / bypass valve question
Instructor
Joined: Mar 2002
Posts: 176
Likes: 0
From: Brentwood Essex
Re: BOV / bypass valve question (rerquiredtext)
My engine rebuild has left me with no AIR or EGR system, so I've decided not to bother with a recirculating dump valve on the blower any more. Intending to fit a standard, piston-type dump valve that just vents to air - that should make a nice whistling whoosh when I back off the throttle!
:cool:
:cool:
Pro
Joined: Nov 1999
Posts: 623
Likes: 0
From: Toronto, ON, Canada
Re: BOV / bypass valve question (rerquiredtext)
Yes, it's possible.
As long as your talking about the air release sound between shifts you can change out the stock recirculating valve on the Supercharger for a blow off valve. I have done exactly that using a HKS SSBOV with some custom tubing.
As a side note though, some people claim that by dumping the excess air into the atmosphere instead of recirculating it back into the intake, you will cause the motor to run rich between shifts. This is because the metered air is not the same volume as the air ingested into the motor. So far this has not been a problem for me but if you're building up a race motor you may have a difficult time tuning all variables.
As long as your talking about the air release sound between shifts you can change out the stock recirculating valve on the Supercharger for a blow off valve. I have done exactly that using a HKS SSBOV with some custom tubing.
As a side note though, some people claim that by dumping the excess air into the atmosphere instead of recirculating it back into the intake, you will cause the motor to run rich between shifts. This is because the metered air is not the same volume as the air ingested into the motor. So far this has not been a problem for me but if you're building up a race motor you may have a difficult time tuning all variables.
Racer
Joined: Apr 2000
Posts: 306
Likes: 0
From: Austin, Tx
Re: BOV / bypass valve question (XTwinTurbo)
This is because the metered air is not the same volume as the air ingested into the motor. So far this has not been a problem for me but if you're building up a race motor you may have a difficult time tuning all variables.
This would only be the case for MAF cars not MAP cars correct?
Pro
Joined: Nov 1999
Posts: 623
Likes: 0
From: Toronto, ON, Canada
Re: BOV / bypass valve question (Janaelen)
XTwinTurbo,
This would only be the case for MAF cars not MAP cars correct?[/QUOTE]
You may be correct on this. I actually don't know any other effects besides it has no impact on my '94. I believe the '94's run a MAP sensor instead of MAF.
This would only be the case for MAF cars not MAP cars correct?[/QUOTE]
You may be correct on this. I actually don't know any other effects besides it has no impact on my '94. I believe the '94's run a MAP sensor instead of MAF.
Melting Slicks
Joined: May 2000
Posts: 2,148
Likes: 1
From: Chandler AZ
Re: BOV / bypass valve question (XTwinTurbo)
Excess boost pressure can dump to the atmosphere if it hasn't been measured yet; i.e. MAP or a blow-thru MAF (downstream of the BOV).
The only time the dumped air needs to recirculate is if it's already been measured; i.e. draw-thru MAF, MAF upstream of the BOV.
The only time the dumped air needs to recirculate is if it's already been measured; i.e. draw-thru MAF, MAF upstream of the BOV.
