ATI race BPV or Super Mondo BPV? Which 1 and why?

Started a little earlier but the project is under way. I'm stuck between these 2 bpv. ATI's is 400 bucks for the race version and the Super Mondo if my eyes reading correct is 630+! I hear the regular Mondo by Vortech is better quality then ATI's race version but I haven't had seen a thread comparing the two. Mondo's is allegedly louder but ATI's has excellent quality behind it.

Here's a link for both if you are wondering what the Super Mondo looks like.
Super mondo http://www.capa.com.au/vortech_performance_bypass.htm
ATI race bpv (you'll have to scroll down a little to see the bpv)
http://www.ls1tech.com/forums/showthread.php?t=408740

So which one would you get and why? Thanks!

Damn.... I didn't realize the blow off valves were so expensive! :o

-B

The regular mondo valve is the one I'm upgrading to. You can get it at summit for about half the price of the ones your looking at.

I can't see buying a bypass valve with that much capacity. At 6000 rpm no matter what bypass valve you use you will still have some stalling when you close the throttle.

At idle with my P1SC and 12pd pulley the system doesn't even need a bypass.

The regular mondo is very large in size(There was a good picture here a few months ago) and it might be difficult to find engine compartment space for the Super.

I can't see buying a bypass valve with that much capacity. At 6000 rpm no matter what bypass valve you use you will still have some stalling when you close the throttle.

No, if you have the correct bypass valve, you will not have any 'stalling'.

At idle with my P1SC and 12pd pulley the system doesn't even need a bypass. JMHO

You'd change your opinion once you blow an intercooler up or brake a gearset in your blower by not running a by-pass valve with that much boost. Anything over 5 psi non-intercooled, and ALL intercooled systems need to have a bypass valve for those reasons.

the pressure has to be released....

No, if you have the correct bypass valve, you will not have any 'stalling'.

What do you mean by "stalling"?

What do you mean by "stalling"?

I was quoting 97WS6Pilot. I assume he was talking about surging.

The prices you see on capa.com.au are australian prices, the 649 would be $475 American. Those bypass valves are huge. I have the Vortech Mondo bypass valve and am having trouble figuring out where to put it.

I believe the two bypass valves are comparable in size and flow.

i just installed the vortech mondo on my car. had an obvious mounting issue(my fault) and blew the whole tube off that it was mounted on during the first time out. ran over it and jacked it up pretty good. remounted it with new vac port which it broke off and works great. it is a quality piece. i got the valve and flange for just under $300 shipped from vortech.

A picture for reference. The diameter of the Mondo is the same as the discharge of the T trim supercharger.

http://community.webshots.com/photo/223099057/365156769LGcjpa

I think I'm going w/ the ATI one just based on price. I've heard good things about the mondo actually more about the mondo than any other BPV. I agree they are all big but I'll be mounting mine right before the TB. With the hood I have I'm not concerned with clearance.

I'm doing the same, but it'll be mounted sideways for hood clearance. :)

You'd change your opinion once you blow an intercooler up or brake a gearset in your blower by not running a by-pass valve with that much boost. Anything over 5 psi non-intercooled, and ALL intercooled systems need to have a bypass valve for those reasons.
Should the bypass valve be mounted before or after the intercooler? Does it make any difference?

If I'm not mistaken it's before but I don't quote me on that. :D

Depends on how you run the system. If you vent to atmosphere (MAF has to be on the pressure side), then anywhere before the MAF. If you recirculate it (MAF on the intake side), then you can mount it just about anywhere.

Have the ATI #stock" bypass valve before the intercooler and a gready type-S copy after the IC and before the MAF.
http://home.koping.net/u3243a/vinter%2004-05/DSC02444.JPG
It sounds like it work perfect, no surgin sound from the SC and best of it all no chattering from the valves when i let of the gas...

Should the bypass valve be mounted before or after the intercooler? Does it make any difference?

It should be mounted between the compressor and the intercooler.

So for the speed density guys you can mount it anywhere then? I'm sticking mine just in front of the tb.

I was quoting 97WS6Pilot. I assume he was talking about surging.

I am not talking about surging. I am talking about the impeller in the supercharger stalling. Basically it reaches a point where no air flows through the supercharger when it reaches its critical angle.

At idle you can hold your hand over the outlet of the supercharger and it will not flow air. Its not a positive displacement unit.

I will agree that its not smart to go without a bypass. But I think bypasses the size of a basketball are overkill.

Did you really break gears in your supercharger?

I am not talking about surging. I am talking about the impeller in the supercharger stalling. Basically it reaches a point where no air flows through the supercharger when it reaches its critical angle.

In the supercharger industry, that is referred to as "surging".


At idle you can hold your hand over the outlet of the supercharger and it will not flow air. Its not a positive displacement unit.
Sorry, but you are 100% wrong on that one.

I will agree that its not smart to go without a bypass. But I think bypasses the size of a basketball are overkill.
We agree on one thing then.

Did you really break gears in your supercharger?
I haven't, but have seen it done on numerous occasions.

Oh yeah, at idle a Vortech or ATI is moving quite a bit of air. I tried topping off the radiator on my car with the blower not connected to the TB and I ended up having to install the pipe and turn it away so I could pour the coolant without it blowing everywhere.

I have a ATI KIT..what kind of bov can we use in place of the bypass valve?

I have a ATI KIT..what kind of bov can we use in place of the bypass valve?
If I understand correctly, you can use a BOV in addition to a bypass valve, but you can't use just a BOV, they operate differently. A bypass valve is normally open at vacum and closes under boost and a BOV is normally closed and just opens to vent pressure spikes. I've been trying to find more info on this topic, but it's hard to come by for some reason.

yea ive been searching too.. so what would be a better bypass..im new to all this but ive been searching for info

Quote:
Originally Posted by 97WS6Pilot
I am not talking about surging. I am talking about the impeller in the supercharger stalling. Basically it reaches a point where no air flows through the supercharger when it reaches its critical angle.


In the supercharger industry, that is referred to as "surging".



Quote:
Originally Posted by 97WS6Pilot
At idle you can hold your hand over the outlet of the supercharger and it will not flow air. Its not a positive displacement unit.

Sorry, but you are 100% wrong on that one.

Ponyhunter,

You can unplug the MAF, remove the hose from the outlet of your supercharger and with your hand applying gentle pressure over the outlet of supercharger you can stop all flow coming out the supercharger. I don't see how I can be wrong when I just did it 2 days ago when I tightened my my belt.

Are you in the supercharger industry? I won't argue about terminology but surging is not the same thing as stalling. Have you ever heard of compressor stall? If not there are alot of articles on it in aviation maintenance handbooks.

Compressor Stall occurs when you have 0%flow or reverse flow through a turbine.

I think all we're disagreeing on is terminology.

Ponyhunter,

You can unplug the MAF, remove the hose from the outlet of your supercharger and with your hand applying gentle pressure over the outlet of supercharger you can stop all flow coming out the supercharger. I don't see how I can be wrong when I just did it 2 days ago when I tightened my my belt.

Are you in the supercharger industry? I won't argue about terminology but surging is not the same thing as stalling. Have you ever heard of compressor stall? If not there are alot of articles on it in aviation maintenance handbooks.

Compressor Stall occurs when you have 0%flow or reverse flow through a turbine.

I think all we're disagreeing on is terminology.

Ok, the terminology may be different in the two industries, no biggie. With that being said, I am in the supercharger industry, at what capacity I will leave up to your imagination.

Your statement was very misleading. I read it as being that if you put you hand in front of the supercharger, you could feel no air moving with the engine at an idle. Yeah, you might be able to put your hand over the outlet and seal it off, but it is still moving air. More air than what the engine needs at an idle. That's why a surge valve is needed, and why people that put a BOV on their supercharged car often times have troubles with surging, tuning, and driveability.

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.

Thanks EdZ28. Happy Thanksgiving to you all as well. :)

ATI race bpv (you'll have to scroll down a little to see the bpv)
http://www.ls1tech.com/forums/showthread.php?t=408740

Hey... that's my car! :D

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.

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.

I agree. I think there are better ways to spend your money than on huge bypass valves.

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.

The stock "valve" that Procharger uses is a modified Ford choke system. On my old set up with a P600B, it failed on me causing my car to run like crap. I used the Vortech by-pass valve until is installed an HKS by-pass valve. I would not trust the stock "valve" on a $2400 head unit such as the F1.

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.

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 am a big supporter of ProCharger. That's all I would ever suggest. In fact, I am going to install a ProCharger on my Integra GS-R in the spring (it's a big let down to get back into the Integra after I drive The 'Bird for while).

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."

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.

Do you have any pictures of that valve installed?

-B

Do you have any pictures of that valve installed?

-B

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

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


linky no worky

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

Powdercoat it. :eek:

Powdercoat it. :eek:

I'm not so sure that would work.... wouldn't it be all bumpy instead of looking smooth and cool looking. :confused:

-B

I'm not so sure that would work.... wouldn't it be all bumpy instead of looking smooth and cool looking. :confused:

-B

Nope. If nothing else, you could sand it down a little before it's coated to make sure it comes out smooth. :)