SP Quick Spool Valve

[NashMan]

humm well ummm if i was to go to all that turble of doing this just use vnt cause its the same concetp some what most likly be cheeper in the end as well


but the big qestion is there eghough choise for hots side whne it comes ot vnt's

i not sure on this one

 

[suprafredde]

I believe its great!

But as mentioned before, will that divider last or will it crack over time.

I have seen a few turbo housing dividers crack when sitting on an undevided manifold.

Price is pretty high since this product allready existed. Not in this form though but the function is the same.

But I undertsand them for trying to make a few $$$ before the chinaman spits them out at 150$...

suprafredde

 

[IJ.]

How do you figure VNT is cheaper Ryan?

 

[Dirgle]

Seems like a product ideally suited for 'twin scroll' or divided housing turbos.


After reading the website i guess i'm just reiterating the obvious.

 

[Grimsta]

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.

Oh right, I was totally thinking of the flow of the top end instead of the slower bottom end. OK, it totally makes sense now. Too many thoughts all jumbled at once

 

[Supracentral]

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

Agreed. It can see the benefit of this - but that is an outrageous claim.

 

[born2drv]

Agreed. It can see the benefit of this - but that is an outrageous claim.

Well if they're saying +25% power at a given RPM due to quicker spool, I could see how the claim is correct based on their graph in the 4000-5000 RPM range.... I'd love to have 25% extra power in that range since that's the most usable range, who wants to wait for 6-7k RPM all the time?

 

[Supracentral]

Oh, I agree, power down low like that is excellent.

But as for that claim itself - it's "vague" at best, deceptive at worst.

 

[NashMan]

why buy 2 things when you can buy one
aka

plate set up : waste gate,turbo,plate,manfold

vnt : turbo, manfold or apdtor

ps never really ever priced one out but can't see it being to high


but as side befor i don't think they ahve man sizes and choices ot choose from

How do you figure VNT is cheaper Ryan?

 

[tekdeus]

: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.

How could you calculate which A/R to use so that the valve is not a restriction? I assume that the valve stays closed at all times, until a set boost pressure is reached. Unless you had some more advanced control of it that left it open all the time, until over 70% throttle AND under preset boost occurs. Would this configuration be better for just putting around town, and for gas mileage?

I'm very interested in this valve, since I'm planning my next turbo setup. A ball bearing, exteneded tip compressor turbo with this valve might be the fastest spooling street turbo ever.

 

[RiyadYar]

the way i see it that wont work because youre making less exhaust gases enter the turbo with the same sizes turbine to make it act like a smaller turbo.seems to me that would make it feel laggier and act as a bigger turbo at the low end

 

[IJ.]

I can't see the valve ever being a restriction when it's open, when it's closed it's doing what it's meant to do and that's increasing velocicty of the slower moving volume of gas at low engine speeds.

Think garden hose, the tap is the volume set it and feel the pressure coming out then hold your thumb across the end partly blocking it and feel the pressure, your thumb is acting as the valve while the volume coming from the tap hasn't changed the velocity has.

If the valve is fitted around the right way on a split pulse housing you're directing this faster moving gas at the tips of the turbine wheel multiplying the force again.

As I said earlier this is brilliantly simple with one moving part.

 

[RiyadYar]

i didnt think about it like that but wouldnt this design create alot of backpressure at the manifold possibly enough would build up to decrese peformance?

 

[IJ.]

no.

 

[tissimo]

How could you calculate which A/R to use so that the valve is not a restriction? I assume that the valve stays closed at all times, until a set boost pressure is reached. Unless you had some more advanced control of it that left it open all the time, until over 70% throttle AND under preset boost occurs. Would this configuration be better for just putting around town, and for gas mileage?

I'm very interested in this valve, since I'm planning my next turbo setup. A ball bearing, exteneded tip compressor turbo with this valve might be the fastest spooling street turbo ever.

There is no calculation, he was simply saying that the nozzle is still the smallest point on the turbine housing so there is no restriction. With this though you can run a larger A/R to get more top end power, but the main problem with running a larger a/r is the lag associated with it. So you sacrifice spool for more top end power. This defeats that and more.

Leave the valve closed at all times unless desired conditions are acheived (xx boost or rpm or both). There wouldn't be any benifit to gas mileage, or putting around town, it would be nearly identical to the valve not being there at all.

 

[IJ.]

Half tempted to get a big AR housing and build one of these

 

[RiyadYar]

it wouldnt create any backpressure?

 

[tissimo]

it wouldnt create any backpressure?

 

[IJ.]

::dead horse::

 

[Boost Lee]

it wouldnt create any backpressure?

No.

And once again,

no.

To throw in my 2 cents, It really is a brilliant idea.
It IS certainly pricey...But this is particularly aimed at the MKIV crowd
(Hence Sound Performance being one of the biggest MKIV "Go-to" companies in the world.) ...So what can you expect?

The design DOES work - No questions about that,
(So the uneducated, Feel free to quit questioning it now). :nono:

But I do have to agree that "25% Power Increase" is very vague...
But technically could be true if we're talking about a specific RPM range.

I've been visiting and going to Sound Performance for many years now,
and I don't question their work one bit...
but their claims do leave me chin-rubbing for a comparison chart of WITH and WITHOUT.

I need to talk with one of the owners in regards to something else,
So maybe I'll find some more information about their power increase "claims".


Jeff