Just the yellow spring. No shims.

 

Oh, another question, did you install the valve with the little hose facing up or sideways? The side where it has the Forge Logo.....

 

If you have the blue spring, then go with the green.
Green is working great on mine with stock boost.

It doesn't matter how you put the valve on but the ideal way is with the vacuum barb on it's side, not facing up. This puts the valve face towards the boost pressure, which will help open the valve.
You are getting 2 woosh sounds and not a squeaking noise with the woosh right?
There is another thread on here that talks about the springs that Forge is involved in.

 

Timzcat: When you say vacuum barb, do you mean the little hose one?

I have ordered me the spring kit from Forge, I will try your advice and pop in the green....

Right now I am having two whooshes and it sounds awful. I don't get the squeak you're talking about though.....Hopefully a softer spring will make the second whoosh go away and have just one big smooth whoosh......

 

Yes, where the vacuum hose goes.
If you just got it recently, it probably has the blue spring in it.
In the future they are planning on adjusting the price and giving everyone the spring and shim kit.

 

i have a blitz one and it flutters also... anyone know a fix for this one?

 

It should have an adjustmnet screw on it, normally out softens the spring tension.

 

i think the tuner kit is only like 15 bucks direct from their website..but they charge 12 for shipping (outrageous) i'd like to find a resaler with cheaper shipping

 

and the valves do come with the tuning kit, i just got mine last week, but without tuning kit

 

your spring is too tight, if it is too tight it will flutter, if it doesnt make a sound its too tight

 

that is true i just installed the green one, and it fixed the flutter, it also seems to have fixed the stalling issue or low rpms drop

 

I installed the green one as well but the flutter is still there, just less of it.

 

i currently own a 2g dsm that runs low 13's at a mile high and i also drive a evo 7 gsr, and i have a blitz bov on both and it makes all different kinds of noises. this is simply becuase the spring is set at one rate and you are boosting different levels at different times. so when you let off the gas at different times the boost may not be strong enough to fully open the valve hence the fluttering sound.

 

Well if that is really the case, its best to go back to stock BOV.....

 

From Blue and lighter it takes 10 in Hg to move the piston. This is less then the stock Bov. The valve should open with out much trouble. This valve only uses boost as an asist really but it will actually operate installed either way.