np, yeah this thing is freakin bad ass. it's like the simpleton version of a variable "vein" aka variable geometry turbo. basically the same effect
basically the quick spool valve + undivided manifold > legit twin scroll everything.
and how you understand it is correct.
basically it's like putting your thumb over your garden hose. it increases the velocity of the exhaust gas but not just that, that extra velocity is going to your exducer aka tips of your exhaust turbine and gets that sucker moving, then it opens up and allows flow to both sides of the exhaust housing without any restriction up top....
you use a non divided manifold, the qsv, and a twin scroll exhaust housing.
basically it takes your exhaust a/r whether it be .63 , .84, 1.00, or whatever, and momentarily cuts the size in half so then once your turbo wakes up it's wide open. therefore allowing you to run a bigger a/r than you'd normally run so you'd have more flow and thus power up top, yet gives you the benefits of having a smaller than you can even buy exhaust housing for response down low.
which is why in function it's like having a variable geometry exhaust housing since it gets smaller/bigger where it matters.
before i forked out $500 for this bad Larry i googled over and over again about this, cause it made sense to me how it worked and why it'd work but if it's kick ass, why the hell don't more people use it? answer: it's $500 hahah
so ya, i didn't find anyone anywhere that said it didn't work. the only 2 bad things i ever read about it were 1. people bitching about the price, 2. people that made their own, and had their's fail. but i never saw anywhere that anyone had a sound performance qsv fail.
looking at the thing man it really is a quality piece. if you wanna see real results of the thing in action check this out.
YouTube - Sound Performance Quick Spool Valve testing and results!!!
YouTube - Sound Performance Quick Spool Valve
^ those are youtube videos you can watch
i'm totally leary and skeptical, like "yeah you guys made the part of course you're gonna have a test that makes this thing look bad ass"
but beyond the sales-pitch it logically makes complete sense how it'd work
and if you look at that guy's powerband.. almost 100 more hp at 2800 rpm..~120 more hp at 3250, ~130 more hp at 3700.....
it's legit! don't worry, you can see how it works out on my car. i'll be the guinea pig, i already have mine.
i would bet money that if you had an sr20det, with a full race or baller expensive twin scroll manifold and a gt28/71r .63 exhaust a/r and did a dyno pull at 18psi
then you put an undivided t3 log manifold, or even better apples and apples, an xspower top mount t3 undivided tubular manifold (since the full race is tubular too) with a quick spool valve and a gt30/76r .63 at 18 psi....
even after you spent 500 bucks on the quick spool valve, you'd have spent less money on your turbo set up, you'd have faster spool with the gt30r vs the gt28r and your WHOLE POWER BAND bottom to top power/torque would kick the 28's ASS!
therefore netting you, a better powerband, quicker response, more power/torque in general everywhere, and it'd cost you less.......
if i were doing a 60mm or bigger turbo on a ka i would do a qsv....ideally for my ka-t 510 once i start making progress on it again i will do a qsv + gt30r or something a lil bigger like a billet pte62 or a comparable comp turbo.
i haven't really gotten excited about an aftermarket product in a while..but man this thing totally pokes a fat finger in the eye of the saying "you can't have your cake and eat it too"
you can run a cheap ebay manifold, a bigger turbo and have better spool...or even just the same turbo you have now and some bigger cams for more power up top and it'll equalize your losses down low hahaha, i love it.
they should pay me for my endorsements
! seriously though i'm psyched, i can't wait to try it out.
another encouraging thing for my build that i duly noted....even on that guy's dyno graph with the quick spool valve open the whole time.....it still is a responsive powerband.
it's a
non ball bearing gt42 (70.8mm) with a .90 a/r turbo on a STOCK motor making ~450hp @ 4300rpm on up... even without the qsv working that's a fun 450hp car to drive....
then WITH the qsv...that thing is awesome!
the expression "if you can't beat em....join em" ....why i haven't had a 2j in any of my cars before this bewilders me... lol
for a month no one could answer my question "name me 2 motors that can make 1000+ hp on the stock bottom end for 2 years plus?"
answer 1 = 2jz-gte
answer 2 = ........................... took a while but someone said a viper motor...
even if they're correct and a stock bottom end viper motor can do it, which there is a guy here named joseph with a twin turbo 1300hp silver viper...however he's been through 3 motors because the crank snaps and the harmonic balancer flies off the motor lol, and
now he's fully built... so i'm still talking stock motor....
so even if my buddy who said a viper motor is correct.....2j motorset = $1800 + 1000-1500 for trans/clutch/bellhousing...so lets say 3300 for a 5 speed 2j motor set that comes with forged pistons from the factory, capable of lets be conservative and say 600hp all day every day won't bat an eye..... how much is a viper motor?? i rest my case...
how many stock bottom end rb26's do you see/hear about with bolt on's reliably cranking out 600hp?
and even if you did get passed the notorious weak rb ring land issue...it's still a 2.6L vs 3.0L. lol just sayin
don't get me wrong...i'm a devout nissan guy....we all know and most will agree though that a 2j > rb26....i hope...but no longer can i keep a blind eye to how much better an inline 6 motor it is to nissan's I6... i can only hang on to my pride for so long until i must admit....although it's a heavy ass frickin motor.....it's King....and non-interference too :P
my .02, justification/blog/rant
Dave
ps this is my thread and i do what i want in my thread hahahha, to stay back on topic, you can run big ass cams if you have a quick spool valve.......maybe lol.