Hey guys, I was just browsing the Supra forums and came accross this quick spool valve for twin scroll turbos and undivided exhaust manifolds. The thread was 31 pages long and there are tons of comparrisons, looks like it can increase spool time by over 500rpm on turbos with the setup mentioned above (looks like 67mm ish turbos benefit the most)

Has anyone tried this on a rotary? With our large A/R requirements for big power, would it be even better?

http://www.spracingonline.com/store/...ool_Valve/3643

 

This is something we need to test to know about.

Divided housings have a BIG effect on spool on rotaries.
You cant use a quickspool with a divided housing.
So what is best, quickspool or divided?
If you take the Mazda testing in the 80s on face value you would say divided, as in the FC they started with a quickspool style setup and went divided.

Im wondering though IF the improvment in spool when divided stays at a similar % improvment, but a quickspools advantage increases with turbo size? In my head and general experiences of similar things I think it may.

So while a GT35R is better off with a divided. I wonder if a GT45 with a 1.2 turbine or something is better off with a quickspool?

I dont know, and theres been no testing to know either way at the mo, as its all speculation.

Cant even be sure from Supras etc either as they seem to find next to no improvment in spool between divided and undivided setups at all.

 

It would be interesting to see the results. The thing seems expensive for what it is. I may be wrong here but I think it would assist in fuel mileage and sound when cruising as well.

 

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I agree that some testing on our cars would be needed.

But if you can stand reading 30+ pages of the part..... you can see that alot of the improvement is not only in power production and spool, but also in the slight bump in torque increase as well.

The Supra guys have seen a lot of improvement over undivided turbos as thats where they see the largest difference, and not many have put their 2cents in from those with divided turbos.

It would be interesting to see this on someones car in the near future......

Nothing but good can come of it, less lag on larger turbos, more efficiency, increase in torque etc etc.....

Yes this sort of technology is not new, but the way in which it is being used is...... A lot of us wished there was a way to lessen the lag on the T78/88, GT42 and larger frame turbos so lets see what we can come up with.....

The Supra community is, AFAIK, the only platform that this device is being used on, so lets try and expand its applications.



Once i get to my next base and get settled i plan on doing a buildup using SP Quick-Spool valve using a 1.0 GT35R or HKS T51R(Undecided ATM), but that wont be for a few months at the earliest.....

 

Mazda performed some testing on this concept, as posted by Arghx.

https://www.rx7club.com/single-turbo-rx-7s-23/mazda-scientifically-tests-single-scroll-vs-twin-scroll-turbos-903210/

S4 turbos used a similar style twin-scroll valve to increase spool. However, after testing fully divided twin scroll housings, they switched to the S5 style fully divided.

Inline 6's don't have the same strong exhaust pulses to be "tuned" and used in a true divided setup like rotaries.

 

"You cant use a quickspool with a divided housing.
So what is best, quickspool or divided?"

u can anly use quick spool with divided housing and undivided manifold

 

Trots- Yes, but that was testing with small low power turbos. Whats good for small doesnt always mean its good accross the board.
I have a sneaky suspicion that for something small like a T04E, GT35R, etc etc, divided would be better.
But when we go BIG, I mean T6 framed stuff, 1.2 a/r, and so on, effectively halving the turbine a/r is more effective.
But without testing, who knows.

Tony- Meant divided manifold, typo.

 

This would really only work with undivided log manifolds... Not sure what most people run, but i have a divided tubular manifold. Divided manifolds wouldn't work with the quick spool since you would be closing off the exhaust completely on one housing.

What I want to try one day is a compound setup with a roots style blower and a large turbo. Blower makes boost instantly while helping to spool the large turbo. Best of both

 

It only works with undivided, but doesnt have to be a crappy log one, can be be tubular and decent flowing.

Twincharged like that is ok but then you got drive losses and terrible efficency from the blower so loads of heat, as well as packaging issues.

Might be better off compounding it with two turbos if anything considering how well rotors spool turbos and how they dont like high inlet temps.

 

I think this would be sick on a 20b, undivided manifold (I think would also save space) and a huge twin scroll turbo.

Seems like almost everyone uses a divided manifold on 13b's anyways.

 

What a jip. You can damn near get a properly built manifold for what they want for the valve. That is the best option, this seems bandaid-ish, and overpriced.