I used to have a greddy type S and i would surge going from WOT to part thorttle.. i so bought a hks ssqv... car feels a Lot better, doesnt buck at all when i let off... but my BOV does flutter, even when the Hks idle screw is backed out all the way [loosest]... Am i surging? or just flutter from my front mount? Should i ditch this BOV? but it feels sooo much better....

basically waht im asking is .. does flutter always mean surge?

Thats just a HKS. They all flutter. It has to do with the way its designed (dual valve). Adjust it so that it opens on a hard rev. Don't worry! It is so much better!

My TurboXS H34 does that too if I have more than 3 washers in it, and I've also been wondering if it's surge or just "flutter".

i'm not familiar with the HKS, but i had the same problem with my GReddy Type s, now matter how i adjusted the screw. I fixed the problem by running a hose from the lower nipple on the GReddy back to the UIP. i was told you can run the line anywhere between the turbo and the BOV. I just tapped it in just above the conection to the IC. no more flutter.

With the greddy type s...you might wanna remove that purple cap then remove the smaller spring...your boost may be too low for the stiffness of both springs...also there is another thread you should look at...

http://www.dsmlink.com/forums/showthread.php?s=&threadid=786&highlight=greddy+bov

hks is well known as a "surge machine". not that they are bad but sooner or later it will have an effect on the turbo

All the HKS BOV's do that....mine does it too.

Mine used to flutter too. It is because of the chrome T-fitting that comes with the blow off valve. It is too small in diameter and it dosen't flow enough air. Ditch it for a larger diamter T-fitting and you'll have no more flutter. Good luck