Heres a project I been tinkering around with.
It is originally made by a company called sound performance and is highly patent protected....

It will succesfully close one half of a twin scroll housing to divide the a/r for quicker spool. This housing will go from a 50a/r housing to a 1.00 a/r housing at full boost. The turbo I will test it on is that Borg warner turbo I got from the wreckers. After talking to Justin and a few other Turbo Gurus, weve decided that it should be at par with an HX35 7blade. or a borgwarner s256. Both turbos are choked by their bolt on housings.. but suffer from too much lag in their stock t3 housings.

At the moment Im just fabbing up a quick down pipe and setting it up on my mock engine. more pics to come.

Cool idea, although that turbo is MASSIVE

Would be real curious to see the difference in spool up

This is awesome. Good work, man. Can't wait to see it in action.

if it works.. I would be interested in running the dyno at shoot out. I will have a cable on it tgat can open it from drivers seat. That way It can be easily switched open and closed for 2 seperate dyno pulls. Aparently the "real" ones cant handle a 2step launch... I wanna make mine manual controlled for that reason.

I believe I came across this or something similar to it a few years back, didn't give it much thought though. Reading this I couldn't wrap my head around how this would work, then I realized you must be utilizing at twin scroll housing with a open/undivided exhaust manifold. Correct?

Ya I forgot to mention that... it is designed to run a twin scroll houisng on a single scroll open manifold. Its sorta a cheaper alternative to buying a $600+ twinscroll manifold... but some have said he QSV actually got better results. The manifold I will be using is a generic well braced tubular T3 manifold I got in a part out. I have a cast t3 manifold in my shop... but the flapper dosent clear the casted flange port.

I wonder if you could use a micro controller to control the valve with a servo motor. You could control the ramping and manual override however you like.

I dont want to over complicate it. If anything, I would control it using a solinoid and Link. But ya, like a electric exhaust cut out... I could have it open during idle and cruise. and automaticly close under load.

Perhaps "porting" the area for clearance would work(???). Or would to much material need to be removed?

Woah!!! Pretty interesting consept. You could even use a Pneumatic Valve/Solenoid to control the QSV and ECMLink BCS Control to drive it.

Ghislain

I could use the cast manifold.. and port the sh!t out of it.. but it isnt mine... and Id like to know if this works before I start dumping money into this.

Heres the down pipe. It rough, I hate the mig welder.

What mig welder is it and what wire are you using?

its just a cheapy 110v mig from princess auto. it works fine.. I just suck at mig welding. still learning. Im more of a stick welder. Have a 220v Linkin ark welder at my dads shop.

In that case it's probably the wire and the welder. Also better wire does help a bit.

I have tried cheap welders and it was night and day difference, sure technique helps but it won't make your welder any better.

Flux core just sucks in general for thin material, it's a dirty, messy process with lots of heat.

If you ever need some tig welding done, hit me up.

Ya. I would like some Argon or what ever.. but cant aford it lol.. Jay, I didnt wanna pay for the shipping to send my mock motor there and back! But If I make another QSV, I will polly just get you to weld the flappers.

I have 3 or 4 blocks sitting around for mocking up things

Fluxcore sucks ass no matter how good a welder you are. I wouldnt even call it mig welding. But a good wire wheel would make that look much better.

I use the flappy sanding disk to make it all smooth, but Stephen is right gas is the way.
It's on my list

This seems really cool! would be interesting on a road course car where it allowed quicker spool in the corners and then more flow top end in the long straights. If I understand the concept correctly.

Think Max effort... Autocross and drag times combined.

It should provide a quicker spool yes. Unless Jay, were you thinking about setting it so one side is either closed or open, manually controlled so you can set it before the race depending on what kind of race you are doing?

I was thinkjng of a choke like cable to hold it open for 2step. But for the most part.. it will be controlled by a electric boost control via link. I will have it openat full boost. The problem Im haveing now is that the turbo Im setting it up for Normally will hit full boost by 4000rpms on a stock twinscroll housing in a undivided manifold. And any bigger turbo will prolly surge like crap before the valve actully opens. I will see how we it works... then maybe invest on a 7blade hx40 or s259bw.

Cool idea,

You will want it to always open at the same time. Or else your tune will always be out of whack.

And a stepper/servo motor like stated above would be a great idea to get that linear boost.

I wouldn't want it opening at full boost, you'd want it to gradually open. If you didn't, your exhaust flow would be restricted to whatever that half of the flange size is.. 1.5" ?? All the way to full boost..

Thats why Link would control it with a solinoid. The housing in the pic is a 1.a/r which in theory would be a .50 a/r untill it opens. thats like puttinga a stock 7cm housing on a gt30r size turbo in this case. Which will surge real bad. specially since the turbo Im using dosent have any surge pertection.

now the Borg Warner turbos of this size are said to spool as fast as the gt30r with the large housing in a non divided manifold.. so it really wouldnt be worth it. If I had a hx40 or bigger turbo.. it should spool the hx40 faster then the BeP housing and the stock housing with a twinscroll manifold. As long as its tuned to open slowly and matched by the spool rate to avoid surging. Cause your right.. The tiny onesided housing wont flow enough to let the hx40 create its potential 70lbs/in airflow.

I guess if you are using a waste gate to open it there will technically be a gradual open...

I guess you will have to find the sweet spot.

From what I read its alot of seat time getting it right. Interesting thing.. some of the guys running this sorta thing, say they can feel when the torque drops when the valve opens.

Not if he is using a ebc to open, will it not just abruptly open as soon as it hits the ebcs designated boost?

CMIIW but the EBC solenoid works on pulses which allows a greater resolution for controlling boost.

This method would be the ideal solution to controlling a wastegate very accurately.

Any testing yet, or is there car on jackstands?

Actally the turbo wasnt big enough.. I would need bigger then 60lb/m twinscroll t3 turbo to run. If anyone wants to try it. Let me know, Id be willing to work soomething out.

I think Im gonna make a t6 QSV and biuld a v8 gt45 set up later.

Ok so I been running my quick spool valve.

Set up is hx35 in 12cm housing, t3 header.. Custom o2 housing.
O2 housing has a hole in the weld before the 02 sensor.
Wastegate is external and set to 25-27psi.
264/272 hks cams


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[img]http://i1059.photobucket.com/albums/t438 [img]http://i1059.photobucket.com/albums/t438/jaystacey/20150919_155724_zpscsgrvatd.jpg[/img] /jaystacey/20150919_155907_zps7ioyclhl.jpg[/img]
Pull with qsv wired open.. So using both turbine scrolls

Try this again.. This is a pull with the qsv wired open.. Using both scrolls.




This is a pull with the QSV wired closed. So Its only using 1 scroll.


Ignore that I didnt make a full 7500rpms.. Im only measuring spool time.

Very interesting. The slope on the RPM line is massively steeper with the enhanced spool, and the increased airflow is also quite substantial. Did you end up using the EBC to open it at a certain boost pressure?

There is definitely grounds to believe the QSV works very well - there is a thread on SupraForums comparing QSV to open turbine, to twin scroll, but I'm not sure it's a trustworthy source since it is the manufacturer's testing. My issue is that it doesn't work on a divided turbo, and I think if you combined the two it would produce the best result. There is a QSV out there for divided manifolds and it's beautiful (see link), but at $732, ouch. I'd love to make my own for 1/4 of the cost.

http://www.dieselperformance.com/index.php/product/index/202P

Mine would do exaclty as that $700 one would do. You could use a twins scroll manifold with mine.. But the point is to avoid the expense of the twinscroll manifold.

Plus. With a twinscroll turbine... It has been proven to spool faster then the equal sized open t3 single scroll turbo... But you loose overall power.

it takes 3.9 seconds to go from 0 boost at 2700rpms... To 24psi at 4176rpms with my qsv closed... And runnning 1 scroll.

It takes 4.7 seconds from 0boost at 2700rpms to 24psi at 4400rpms. With the qsv wired open and just running open twinscroll.

But the valve limits the boost to 24psi. The open scrolls allow it to peak to 27psi and holds it there.
So Im gonna program it to open the valve at 4100rpms.

I can feel it while cruising around.. With the valve closed , I can spool the turbo and blow off the BoV. It feels responsive. But with the valve open.. Running both scrolls. I dont hear anything while cruising.. And its like driving a NA car.

Someone already made one like you describe. http://www.supraforums.com/forum/showthread.php?742098-Kevin-s-Divided-Manifold-Quick-Spool-Valve

I love the diesel valve I linked, it's a brilliant piece of engineering and quite nice to look at, but that cost...ugh.

The trick to using twin scroll with a spool valve is to run a big turbine housing to offset the lack of flow; you will be in "net positive" territory if you match it properly.

Also, Borg-Warner is using spool valves on twin scroll EFRs starting early next year, so they see something in it too.