ATI race BPV or Super Mondo BPV? Which 1 and why?
Registered User
Joined: Apr 2005
Posts: 1,546
From: Florence, Kentucky
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Originally Posted by markinkc69z
I'll assume that those of you participating in the thread realize that there is nothing trick about a bypass valve. Its purpose is to be able to flow enough air to dump inlet pressure (volume) when you remove the demand (let off the throttle). If this airflow isn't dumped the pressure will spike in the system and can inflate intercoolers, remove tubing connections and damage the compressor. The valve should be matched to the airflow capacity of the installed supercharger. Blow off valves are not part of a centrifugal supercharger installation and can damage a compressor during operation. The pressure waves that occur during operation are hard on a compressor wheel as the wheel is directly attached to the crankshaft via the drive belt. They may be fine for a champ car type thing where the ultimate boost is limited by such a valve (because of rules) but they have no place on a belt driven supercharged system. That stuff is for the fast and furious crowd that has no clue about what's really happening in the system. The stock valve in our street kits is capable of dumping the airflow of an F1. The only reason to upgrade if you have an F1 or below would be for looks, and that's just fine.
Just know why you are doing it.
Just know why you are doing it.
Registered User
Joined: Oct 1999
Posts: 584
From: Naperville, IL, USA
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Originally Posted by markinkc69z
I'll assume that those of you participating in the thread realize that there is nothing trick about a bypass valve. Its purpose is to be able to flow enough air to dump inlet pressure (volume) when you remove the demand (let off the throttle). If this airflow isn't dumped the pressure will spike in the system and can inflate intercoolers, remove tubing connections and damage the compressor. The valve should be matched to the airflow capacity of the installed supercharger. Blow off valves are not part of a centrifugal supercharger installation and can damage a compressor during operation. The pressure waves that occur during operation are hard on a compressor wheel as the wheel is directly attached to the crankshaft via the drive belt. They may be fine for a champ car type thing where the ultimate boost is limited by such a valve (because of rules) but they have no place on a belt driven supercharged system. That stuff is for the fast and furious crowd that has no clue about what's really happening in the system. The stock valve in our street kits is capable of dumping the airflow of an F1. The only reason to upgrade if you have an F1 or below would be for looks, and that's just fine.
Just know why you are doing it.
Just know why you are doing it.
Registered User
Joined: Mar 2005
Posts: 849
From: Shawnee Kansas
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Well you would be one in a very few that ever had a mechanical failure with the unit. You may be referring to the actuator motor which is an OE choke pulloff valve. Very reliable and does exactly what it should. Sorry to hear you had some type of failure, but your failure is absolutely no reason that anybody else should be aprehensive about the unit. Why the quotes around "valve"?? It is a valve. Not a facsimile of a valve. Depending on how old your "unit" was, the bypass valve would have been manufactured by Bosch as an OE forced induction bypass valve. Oh well. Sorry for your trouble.
Registered User
Joined: Oct 1999
Posts: 584
From: Naperville, IL, USA
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Originally Posted by markinkc69z
Well you would be one in a very few that ever had a mechanical failure with the unit. You may be referring to the actuator motor which is an OE choke pulloff valve. Very reliable and does exactly what it should. Sorry to hear you had some type of failure, but your failure is absolutely no reason that anybody else should be aprehensive about the unit. Why the quotes around "valve"?? It is a valve. Not a facsimile of a valve. Depending on how old your "unit" was, the bypass valve would have been manufactured by Bosch as an OE forced induction bypass valve. Oh well. Sorry for your trouble.
I purchased my old P600B in 1997 and it failed a few years later. In my book it shouldn't fail.
Yes... I know it's a valve. I was just trying to make a point that it's not the best. Like I said, I wouldn't trust that valve with 22 psi from an F1. But that's just me.
My take on that "valve".
Remember the old Crocodile Dundee movie?
"That's not a knife. This is a knife."
"That's not a by-pass valve. This is a by-pass valve."
Registered User
Joined: Aug 1998
Posts: 1,384
From: Los Angeles, CA
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Originally Posted by EDS Z28
I would go with the vortech bypass valve, as vortech has better quality stuff than ati IMO.
I run the blue vortech bypass valve, which is vented to atmosphere. I am able to vent it to atmosphere because the maf sensor was installed near the throttle body. You should not do this if the maf is installed near the air cleaner or before the supercharger. The bypass valve has a 1-1/2" diameter outlet, which is enough for most street cars. This part is very high quality and I never had a problem with it.
At idle, it lets out most of the air moved by the supercharger into the atmosphere (ya, wasted energy I know). In fact, you can feel it blowing the air out if you stand near the driver side wheel. As you gas it, you can hear it close until under boost, then it becomes 100% closed.
I run the blue vortech bypass valve, which is vented to atmosphere. I am able to vent it to atmosphere because the maf sensor was installed near the throttle body. You should not do this if the maf is installed near the air cleaner or before the supercharger. The bypass valve has a 1-1/2" diameter outlet, which is enough for most street cars. This part is very high quality and I never had a problem with it.
At idle, it lets out most of the air moved by the supercharger into the atmosphere (ya, wasted energy I know). In fact, you can feel it blowing the air out if you stand near the driver side wheel. As you gas it, you can hear it close until under boost, then it becomes 100% closed.
-B
Thread Starter
Registered User
Joined: Jun 1999
Posts: 972
From: The Haven, Fl
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Originally Posted by blown383
Do you have any pictures of that valve installed?
-B
-B
http://home.koping.net/u3243a/vinter...5/DSC02444.JPG
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Joined: Jul 2003
Posts: 2,006
From: (SHOWING U MY TAILIGHTS)FaiRFieLD CaLiFoRNiA
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Originally Posted by ZBLKHELLRZR
In this pic it looks like the Mondo and not a stk ATI unit if I'm not mistaken.
http://home.koping.net/u3243a/vinter...5/DSC02444.JPG
http://home.koping.net/u3243a/vinter...5/DSC02444.JPG
linky no worky
Registered User
Joined: Aug 1998
Posts: 1,384
From: Los Angeles, CA
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Are there any other options to the Vortech mondo valve and the ATI race bypass valve? The Ati looks nice but is too damn pricey, the Votech one works great but looks like crap. I would by totally buy it if it came anadoized in other colors instead of being satin or highly polished.
-B
-B
Registered User
Joined: Aug 1998
Posts: 1,384
From: Los Angeles, CA
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Originally Posted by 97WS6SCharged
Powdercoat it. 
-B
Registered User
Joined: Nov 2002
Posts: 4,784
From: Jacksonville
Re: ATI race BPV or Super Mondo BPV? Which 1 and why?
Originally Posted by blown383
I'm not so sure that would work.... wouldn't it be all bumpy instead of looking smooth and cool looking.
-B
-B
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