SP Quick Spool Valve

[tekdeus]

There's a couple of long threads and much interest on Supraforums about this new product from Sound performance. Check it out:
http://www.sound-performance.com/p192/Sound-Performance-Quick-Spool-Valve/product_info.html

http://www.supraforums.com/forum/showthread.php?t=481292
http://www.supraforums.com/forum/showthread.php?t=516096

If it really works like they claim, perhaps a ball-bearing 67mm or larger turbo could spool as fast as a standard 61mm turbo? I wonder if it only makes a substantial difference on laggier turbos?

Discuss!

 

[IJ.]

Very interesting concept.

 

[Kristian_Wraae]

800 dollars..........

 

[got_boosted]

Looks to me like unnecessary restriction that will hurt top end/high boost performance which basically ruins the point of having that large of a turbo anyways. I could be wrong though. I'd be very interested to hear some reviews from people with these on there cars and maybe some before/after ET's.

Collin

 

[GrimJack]

25% increase in whp? I call BS. Better spool, maybe... a bit more power, maybe.

 

[Kristian_Wraae]

They should make that flap fold up against the side wall instead of putting it in the middle of the exhaust stream. I know that would put some stress on the actuator but it would not make any turbulence. You could probably make some kind of lock mechanism operated by the actuator so that the flap will stay put until a certain boost pressure is reached.

Like this

With the actuator operating both the lock and the flap simultanously.

Sorry for the crappy drawing.

 

[Grimsta]

Wait, that doesnt make sense. It spools the turbo faster by letting less exhaust ENTER the turbo?

 

[Kristian_Wraae]

Wait, that doesnt make sense. It spools the turbo faster by letting less exhaust ENTER the turbo?

Same amount of exhaust passes through the turbo (all the exhaust).

The difference is the speed of the gas. The wheel sees exhaust gas at double the speed.

 

[Grimsta]

But by reducing the diameter of the entrace the amount of gas that is in the exhaust is bottle necked into a smaller opening so sure the speed of the gas is accelerated but the flow of air through the engine would be slowed down since the same volume of exhaust gas that existed before exists now, but has a smaller opening to go into. Think of it like this. take a garden hose and pour it into a funnel w/ a 1" opening, the water will flow right through, now pour it into a funnel with a 1/2" opening, the funnel will fill with water since more water is coming that the small outlet can evacuate

 

[Kristian_Wraae]

well the valve opens as rpm rises and more flow is needed.

It's no different than a sequential system. First all gas is lead through one turbo. Later on both turbos see the exhaust gas.

 

[kotu100]

But by reducing the diameter of the entrace the amount of gas that is in the exhaust is bottle necked into a smaller opening so sure the speed of the gas is accelerated but the flow of air through the engine would be slowed down since the same volume of exhaust gas that existed before exists now, but has a smaller opening to go into. Think of it like this. take a garden hose and pour it into a funnel w/ a 1" opening, the water will flow right through, now pour it into a funnel with a 1/2" opening, the funnel will fill with water since more water is coming that the small outlet can evacuate

the funnel concept isnt the same since its not pressurized. i see how it could help spool a little bit but it seems the downsides from it would outweigh the positive gains. also wouldnt EGT's be something of a problem with such an extreme bottleneck?

 

[tissimo]

extreme bottleneck?

lol.. no This isn't ment to be run a small turbo. They're mainly ment for BIG t4 (78-80mm) and T6 turbos. Their exhaust wheels flow a lot of air and their housings are still quite large even with 1/2 being used.

Toyota used this same concept on many of their cars on the intake side, calling it TVIS. Had dual runners with a valve on one of them. My 3sgte has it for example, and @ 4000 rpms then 2nd runner opens up to provide more flow but under that the single port is big enough and just increases velocity. I noticed a 7-10% increase in torque using the TVIS.

 

[WeDgE]

Very cool concept...but quite steep at $700...

 

[IJ.]

:nono: guys you need to read about and understand the divided turbine/split pulse concept.

The divider in the turbine housing is laid out so half of the flow is directed at the outer edge of the turbine wheel where it gets more leverage and this is where the valve directs ALL of the flow from the engine to that side then as demand/boost increases opens to allow full flow.

At lower RPM/Flow the engine isn't producing enough volume of gas to spin the turbo hard hence Lag but you need more flow at higher rpm/boost so if you choke the nozzle down for good response you kill top end.

This valve gives you all the benefits of a VNT Turbine without all of the hassles and is such a brilliantly simple concept.

As for it being a restriction nuh uhhhh think again the "nozzle" is the point of greatest restriction so unless the valve reduces the entry to a smaller area than the nozzle it's not restricting shit.

I can see this making more top end "IF" they used a bigger AR turbine housing and let it breathe taking advantage of the valve to make it respond well down low.

 

[foreverpsycotic]

I wouldn't do this, unless you were a hardcore road track racer, and you needed full boost out of a t67 @ 3800rpm, or you had a turbo 74mm or bigger on a a 3l block.

This gives me an idea, what about a plate like that that has the ability of blocking the whole of the flange untill a certain PSI has been made in a parallel twin turbo setup, thus making it a mechanical sequential twin setup.

 

[shaeff]

Interesting for sure. I want secondhand proof though.

I certainly understand how it works. I just want to see a test done by someone who isn't the company that made it.

 

[cruisnhard]

Seems like a good concept, but I agree with above about it not really needed on the streets. I could see where it would be fun at the track though. I also do not see a 25% increase in power it just hits the power earlier.

 

[tissimo]

t it not really needed on the streets.

durr.. uh what?

Thats the point of making the turbo spool faster to make it more 'streetable'. When you're racing you do not care about RPMs you're not at, so thing would be pointless.

 

[Zazzn]

i was loooking at the valve as well, it looks interesting, but unless you can get your housing modified it will cost too much to modify the DP ic pipes to get it to fit... Then you need to control it with a MBC or EBC or something so it opens at a desired boost level. I think the stock spring is something like 10 PSI.

 

[tsuper92]

this type of set-up is being used on deisel truck's and isn't a new concept.they can also supply you with a vacum switch(which is adjustable) to control the actuator opening and closing.the problem is you need an un-divided manifold and a divided turbine housing