http://www.spracingonline.com/store/Sound_...pool_Valve/3643



I havnt seen any threads on this forum yet. It looks like its the new thing to make your turbo spool quicker. Basically how it works is you have a undivided manifold matched with a divided turbo exhause housing and in the middle you have a spool valve which is divided. At lower rpms the valve stays closed and at higher rpms it opens.

Basically say you have a .88a/r exhaust housing... when the valve is closed its a .44 because you are reducing the size by 1/2. then when it opens fully you have the full .88a/r.

as some of you know i am no longer in a s2000 and own a supra and a lot of the owners sware by this. I already have a twin scroll manifold on my supra so its pointless for me but it looks like a great idea for you guys since there is very few twin scroll manifolds out there for the s2000.

Supposibly its better than a twin scroll but i would like to see some testing comparing the two.

 

How reliable is this valve? I'd imagine it is electronic? Is it bad for the turbo in any way since only "half" of it is getting exhaust flow for part of the time? I'd imagine it puts some additional stress on the spindle...

It does sound very interesting...

 

 

im interested to see someone try it :-) it would be a huge product hit if it works for our cars too

 

its very reliable. The company that makes it is well known. Its been tested on supras before. You need additional room to fit it. you would have to modify the downpipe for it to work since you are raising the turbo 3/4"

As of now i see no downside to it. If i still had my s2000 i would have put it on my inlinepro sidewinder manifold.

 

I would use this with a big turbo it really sounds and looks like it would work well.

 

I dont understand this. With a bigger turbo and this valve they claim that you will have faster spool but how is that? You need as much exhaust flow as you can get to increase the spool but with the valve you will be closing off some of that flow at lower rpms. Wouldnt that cause the turbo to not be as efficient and spool slower? Maybe I'm reading into this wrong or something. I guess it could be possible since all the exhaust gasses will be sped up by being forced into one smaller port instead of the two. I'd like to see someone try this out to see if it really works or not.

 

its working the same way that a smaller exhaust housing works... if you have a .48a/r exhaust housing its going to spool faster than a 110a/r exhaust housing isnt it? It just wont support the same top end as the bigger exhaust housing.

What this does is keeps it closed until the larger exhaust housing is needed to flow more air to give you the best of both worlds.

Its quite simple if you think about it. Im not sure if you are thinking too far into it or something but its very basic.

It does really work. look at the graph shown. the company that makes this has one of the fastest supras out there. They know what they are doing, have been around for MANY years and make great products. The supra people speak highly of them.

 

im reading it.... maybe im confused... but does it require your turbo to be twinscroll??

ill have to show and ask my tuner about this tomorrow. if its possible to work on a full race manifold set-up



This was from the website.

*** Notes:
You will need the following in order for this valve to work
- Undivided exhaust manifold
- Divided exhaust housing on your turbo

 

You have to also remember though that a larger compressor takes more to spin it up. So, this is where I'm confused I guess.

I'd just like to see a back to back on the S. Maybe someone with a GT35r or GT40r run a dyno run with and without it. It may not work as well on 4 cylinder engines as it would on a 6 or 8 cylinder but who knows. It may pose the same kind of problems that an STS turbo kit has on a 4 cylinder engine as apposed to a 6 or 8 cylinder engine. The 4 cylinder engine just doesnt produce enough exhaust gases to have a turbo all the way at the back of a car. It just loses too much steam on a 4 cylinder engine. See where I'm going?