Originally posted by caliwrxsun and some blow off valves like the greddy type S use a system that while doing all this , keeps the turbo spooled between shifts!
hmmm...what? The Greddy Type S is exactly like the stock BOV, with two exceptions: 1. You can adjust the spring, and 2. it also has a little nipple so it will vent so air to the atmosphere. It isnt designed to keep the turbo spooling or anything.
hmmmmmmmm sorry bud, i raced DSM's for about 3 years, and most competetive DSM'rs run the greddy type s for 2 main reasons, from all the pressure tests, done, WHICH I DID MY SELF also to see if it was true, the greddy type s was the one that held the most before it started leaking, and two becouse in between shifts it keeps your turbo spooled, and another, thing, not all cars can JUST vent to the atmosphere, i am not sure how wrx's handle that, but i know for a fact that dsm's dont handle that too well becouse they stall alot, besides, the greddy type s IS DESIGNED to recycle back into your dump tube.
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Calisunshine come visit , just dont stop at stop signs with bullet holes in it....
Originally posted by caliwrxsun hmmmmmmmm sorry bud, i raced DSM's for about 3 years, and most competetive DSM'rs run the greddy type s for 2 main reasons, from all the pressure tests, done, WHICH I DID MY SELF also to see if it was true, the greddy type s was the one that held the most before it started leaking, and two becouse in between shifts it keeps your turbo spooled, and another, thing, not all cars can JUST vent to the atmosphere, i am not sure how wrx's handle that, but i know for a fact that dsm's dont handle that too well becouse they stall alot, besides, the greddy type s IS DESIGNED to recycle back into your dump tube.
You didn't say anything different than Tut said, except that it held more boost before leaking.... All turbos stay 'spooled' between shifts bro.... the turbine on a turbo is spinning at thousands and thousands of RPMs, it doesn't just stop. (Unless of course you have no pressure relieve system such as the stock recirc, or a BOV, and then you can get compressor surge, or worse, reverse spin) If your BOV, the Greddy Type S, vents back to the stock location, then it is not doing anything different than the Stock Recirc. Valve.
Going back to the original ? at hand, it depends if you are going to replace your cats or not, and if you have a cold air or short ram/ stock box. Without cats you will get backfires, I get them myself from third to second gear downshifts. With Cats I don't Know??? And with a cold air, the 100% air vent Probally causes more problems than is already there. I can't really tell on my car, other than it runs rich at idle, Especially after removimg all the cats. When I install my greddy air/fuel gauge ,(hopefully soon) I will have a real display of air/fuel amounts to make judgements on.
I have the Gfb hybrid 50/50 , installed last night, felt an imediate inprovement on throttle response inbetween shifts, and has quiet enough that it wasn't annoying....
jeremy www.imprezafest.org
You will still get the Afterfires with a BOV and cats, the cats are one of the biggest reasons you get afterfires. That sound is the sound of that extra fuel which made it through the combustion stage, detonating on the Hot Cats. However, even without cats you'll still get the afterfires, because it'll just detonate on the hot exhaust as well.
can anyone get me a sound clip of the GFB hybrid please, the only one i saw was the one on bov.com and its just a rev....also this GFB wont make the car run rich like bov's do in the rex? the links here dont work if they are clips
I had one before, 100 % atmoshpheric. Personally, I`d rather have my car run stronger than sound cooler! If you go with one do the 50/50!! Took mine off & she`s better now, I can still hear the stock one due to my intake & DP. Outside of the car too!!!
The stock bov is the best for our cars up to a certain psi but thats a different ball game. If you want a cooler sounding one then pretty much any bov will do, but none will work better then your stock one, maybe equal too but not better.
Where did everyone get the idea that an atmospheric BOV would hurt performance? All it does is make the car run a little rich between shifts, making shifts a little (very little) less daily driver friendly. Deceleration is a little more sudden when you let off the throttle. Besides shifting a little smoother, a car with a recirc will not "perform" any better than a car with an atmospheric. At all-out, hard driving it makes no difference. A good protune can even smooth out the rich-ness. BOV's are all about preference untill you are pushing more than say 20psi. Then you just need one that will hold.
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All turbos stay 'spooled' between shifts bro.... the turbine on a turbo is spinning at thousands and thousands of RPMs, it doesn't just stop. (Unless of course you have no pressure relieve system such as the stock recirc, or a BOV, and then you can get compressor surge, or worse, reverse spin) If your BOV, the Greddy Type S, vents back to the stock location, then it is not doing anything different than the Stock Recirc. Valve. 
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