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03-17-2013, 04:53 PM | #1 |
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Quick Spool Valve opinions?
So I was reading about my new coming project(2JZ and stuff) and came upon this thing.
Quick Spool Valve. It's basically a twincscroll-like divider between the manifold and the turbo controlled by the wastegate mechanism. http://www.suprastore.com/spquspva.html ^There's more info about it with dyno graphs of before and after. They are getting some amazing results like ~400HP at 3700rpm with GT42 vs 270HP before and 550TQ at 2700rpm vs at 4700rpm with not much loss in top end. It's hard to image to be honest. It's not a new idea either. So has anyone heard about that,have some personal experience? Why no one is using one on Subarus? It's not cheap considering you need custom manifold and the valve is expensive by itself but the low end gains are crazy |
03-17-2013, 05:43 PM | #2 |
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or you can just get an external wastegate and equal length headers.
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03-17-2013, 05:54 PM | #3 |
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^^^What??? These work by creating more exhaust back pressure and create a bottle neck at the exhaust housing inlet. I don't know what an el header and ewg are going to accomplish as far as that. They do seem to work very well for the Supra guys. I remember seeing a thread on this board a while ago about them, or something similar. It doesn't seem to be something that anyone is interested in trying for the Subaru community. Try one and report back lol. Btw, is a divided turbine housing necessary for using one?
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03-17-2013, 06:27 PM | #4 | |
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03-17-2013, 06:30 PM | #5 |
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The SP one may not be as totally optimized as it could be; it creates a restriction in one part of the twin scroll housing and means you don't get to have a real twin scroll setup. I've heard rumors BW has prototypes of similar things out in the wild in various places but a bit more optimized. Regardless, the theory's sound - hell, there's OEM setups out there that do the same thing.
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03-17-2013, 08:18 PM | #6 | |||
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Ok were're talking about 3.0L motors but still 82mm turbo with a spool/low-end power band of like 18g or even smaller? As for small turbos on Subys, there's plenty of Subaru guys running GT35's and up on the street.That could be a nice upgrade. Quote:
I wonder how it this QSV's reliability with the temps it sees constantly.But then again it's a simple setup. It most likely can be done DIY for 1/3 the cost. Than it becomes an even better option. Anyone has some info on that thing working with smaller turbos(30R or something)? |
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03-18-2013, 08:48 PM | #7 | |
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03-18-2013, 09:53 PM | #8 |
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03-17-2013, 09:05 PM | #9 |
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There was a thread on this a while back. Had a lot of info in it...
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03-18-2013, 05:48 PM | #10 | |
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http://forums.nasioc.com/forums/show....php?t=1857853 Lol at many's comment, it comes with the territory; everything with a grain of salt. This industry is slow/unwilling to change, new'ish tech/theory takes a while for everyone to catch on. |
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03-17-2013, 09:16 PM | #11 |
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I know these very well. They do work. Quite well.
I'm debating between using one of these or twin scroll. Ill get a killer price on them so I will prolly go with one. At least to test. Last edited by WhatTurboLag?; 03-17-2013 at 10:36 PM. |
03-17-2013, 11:01 PM | #12 | ||
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Know anyone else besides SP who makes them? LS1 did or does but they were not good?Any one else? Price of SP seems kind off high even though they are probably made with good materials to withstand the temps. This could be simple DIY project What turbo you'll be running and how would you control it? |
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03-18-2013, 05:09 PM | #13 |
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03-18-2013, 12:01 AM | #14 |
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I haven't heard much from other platforms using this. I did search long ago and found what seemed like some semi reputable reports of the importance of controlling the duty to allow gradual transition as you would have a shifting ve curve. Kudos if you actually try it. I think that you need to be extra critical reports and look more or less at what it takes to make it work well than to look at just how it works. You're introducing a restriction that has the potential to add a lot of turbulence. Tuning it correctly would be my main concern especially if you have avcs which is already increasing dynamic compression. I'm sure it can be done but I doubt that oversimplifying the concept is the right way to go.
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03-18-2013, 12:20 AM | #15 |
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These work. You will be able to run a bigger exhaust A/R, something close to 1 or even higher, as the QSV will 1/2 it until the valve rotates open under the boost your actuator is set at.
Also you can make this at home. Get a divided t4 flange from Ebay and also a throttle body for the shaft. Get some high quality stainless steel and a tig welder. Bring it to a machine shop to drill the hole for the shaft and cut the steel. Find an actuator with a low PSI setting, like a z31 (7 psi) or something even lower that has a 4-5 psi actuator from the junkyard. You can make it by yourself with the necessary tools for around $50 or probably around $150 with a machine shop. The people who make SP's are good quality I will say, but still way overpriced. |
03-18-2013, 05:01 PM | #16 | |
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03-18-2013, 03:16 AM | #17 |
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The idea of the sensitivity these engines have to backpressure is enough to never use one myself. Keep in mind the alloy consideration.
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03-18-2013, 08:36 AM | #18 |
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03-18-2013, 08:40 PM | #19 |
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SS for the flange. 304 SS for flapper and screws. Any wastegate actuator. SS for the WG bracket.
I doubt that SC one uses any kind of seal on the shaft. Just precise machining.Leakage would be minimal and wouldn't matter. Definitely could be done for ~$150 yourself using very good materials, ~$200 with some machining. |
03-19-2013, 03:00 PM | #20 | |
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And to those guys saying wrx's don't have turbo lag? What? Some people upgrade from the stock turbo's here/VF39's as stated. I run a rotated 35r on a ej257, and trust me, there is enough lag where one of these would be awesome. I also run a T72 on a VG30, so from actual personal experience I can tell you they work. And back pressure? You really think one flapper on a dual scroll is going to cause reversion in gasses being force into a collector from both cylinder banks? I'm new to nasioc so maybe I'm not use to answers/concerns like these from other forums I'm on. Stop throwing people off if you have no idea what you are talking about. This is why it takes people so long to evolve new racing technology because you have people running stock turbo's at close to stock power levels giving advice on something they have no idea what they are talking about, but heard from their cousins mothers second brother that his corvette was running one on a naturally aspirated engine and it didn't work like dem turbo motors. Last edited by 300zxturboftw; 03-19-2013 at 03:08 PM. |
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03-18-2013, 08:53 PM | #21 |
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Its like a sequintial setup but for one turbo. Works great for cars with 3.0 or larger displacement trying to spool a giant ass turbo faster. Subaru guys for the most part have no idea what turbo lag is, supra guys have dealt with it since jesus was born.
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03-19-2013, 01:18 AM | #22 |
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03-18-2013, 09:51 PM | #23 |
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I think you're exaggerating. Any turbo will be more laggy on 2.5 or 2.0L than on 3.0L
35R+ on a 2.5 or more-so 2.0L is laggy as hell.. it's not like 99% of people run vf39's It was tested with 6262-sized ones and gave great results too |
03-19-2013, 01:21 AM | #24 |
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The real question is, who's going to test one of these bad boys out!?!
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03-19-2013, 03:12 PM | #25 |
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You better get used to that mentality here
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