Like the title says i'm looking for a video clip or a sound clip with and evo running an hks ssqv recirculated.

 

You loose the cool wistle noise when installing the recirc kit. It replaces the 3 blade peice with a hose fitting. And without the 3 blade piece it just sounds like a loud air woosh sound I tried it, wasnt for me. I went back to the stock ix valve.

 

Yes I have have it and its recircualted but it sounds just like compressor surge... So I was wanting to see other peoples setups and hear them.

 

HKS SSQV - one of the worst designs for our type of cars. Recir or not - it just isnt for an Evo. Please search on this topic.

 

It's SSQV stuff is opinion. If an SSQV is causing problems, it's most likely from a leaking o-ring where it is mounted. That can be corrected by going to a thicker o-ring or just welding the base to the flange. The design it's self cannot leak under boost. In theory would be able to hold pressure to the point that the secondary valve is blown through the outlet, which would be in the tripple digits. An SSQV can leak during idle if your engine pulls a lot of vacuum or there is a weak spring. The older SSQVs, like the one in the picture, have an anjustment screw to compress the spring. Newer ones don't and can be adjusted by taking them apart and shimming the back of the spring. It's hardly ever nessary, but it can be done, and screwed up easily. It's the reason that the later of the SSQV designs didn't have an adjustment to begin with. They just designed it to stay closed with what the average vaccum would be. If the spring just a tad bit too tight it will not work very well.

Anywho, as you can see in the picture, the vaccum connection goes into chamber A and B is just a static chember. Boost pressure adds to chamber A which is actually pushing the valve shut, which isn't nessary since the boost pressure from the C is already holding the valve shut. If you look carefully at how the primary and secondary valve are seated, you can see the air space between the two. There are very small holes on the back of the secondary valve that allow a little air to flow in the area behind the the primary valve. It's really important that those are not gunked up because those are what make the SSQV work. Once the vaccum in A is great enough to overcome the spring pressure, the primary valve is pulled back just a slight bit. The vaccum pressure doesn't have to be exceptionally strong because of the small surface area on the primary valve. That is the reason the spring pressure needs to be right for what vaccum the engine pulls under normal driving or else it will open. That *does not* mean that it's wrong for an EVO. It just means that it's very sensitive and needs to be adjusted right. When opperating under higher boost loads, the primary valve opens and allows a little pressure to pass through the holes in the back of the secondary valve which then causes a greater pressure area on the outlet side of the secondary valve and opens it all the way. There is no spring or anything assisting the secondary valve. It's a simple plastic/rubber valve that rides on the piston for the primary valve. Once open, it allows the pressure to equilize at which point the vaccum falls back into the normal driving range and closes the primary and secondary valves.

There you have it. That is how the HKS SSQV works. It's important that it kept clean internally (as you would hope anything in you inlet would be) because of the seals for the primary valve shaft.

Maybe I fail to see why this is a "bad design" other than "because everyone says so". I have already pointed out what problems you can have with it and how they can be fixed. The flow rate of the smaller valve isn't really a valid if you want to compare it to something such as a Tial, which you would be using on a much much larger turbo than most people have with some sort of EMS where you are not using a recirc setup.

The standard bov uses standard single piston setup that uses a boost/spring assist to hold the valve shut against boost ptessure. The diaphram on the on the chamber is usally larger in diameter than the valve to increace the surface area so that the spring doesn't have to be too strong. Too small of a diaphram and a stiff spring won't allow the valve to open because the vaccum can't overcome the spring because it has to be set hard to prevent boost pressure agianst the valve from opening it. Just like the SSQV, there is an optimal point of adjustment between spring pressure and normal engine vaccum. However, even with that optimal point it is still possable because of the push time design to open under boost.

I think the dislike of the SSQV on EvoM is kind of like a version of the 100 Monkey theory. At one point in time someone had a bad SSQV experence, and once they spred the word and did some forum flaming, other people then continued to pass on that SSQVs sucked untill it reached even more people who then spread the message without even knowing why.

Later.

 

Thats a lot of work for a part that can easily be fixed by using the right DV to start with. Yes, I know of the problems. Im sick of restating them all.

https://www.evolutionm.net/forums/sh...d.php?t=365204