Which of these BOV would you prefer, the Greddy Type-S or the HKS SSQV? I'm planning on getting the Drag III kit and I have a choice of the BOVs. I'm thinking of running around 9 - 10psi of boost, btw.
What are the performance and sound benefits of one BOV versus the other?

Thanks!


[Modified by Sh4rky, 6:54 AM 2/7/2002]

 

I have heard both and although I like the HKS SS more, they both sound awesome

Dustin

 

Thanks for replying!

Is the HKS louder?

 

I think the greddy is somewhat louder, but it all depends on boost level. The HKS SS has a more "full" sound to it.. it's hard to describe.

Dustin

 

damn i got my hks ssqv chillin in my room wit no turbo yet. cant wait to get it next week.

 

I'll go with the HKS then.

How much did you pay for it, 01geeser?

 

I got the HKS racing type II. It sounds soo beautiful IMO

 

i got it off vaportrail new for 165 shipped. sold it to me cuz he got the hks racing BOV.

 

my hks doesnt really go off when my car is parked and im revving..is this normal?

 

No load on the engine, no boost building up hence no pressure to relive. You should hear a small bit of blowing off, but not like you do when driving. Also depends on how stiff a spring your BOV uses and how hard you set it. My Type S blows off a little without moving, but is 5 times louder when i'm driving.

 

Actually, on the Type-S, if you set it REALLY soft and rev to like 6-7K, you will hear a pretty loud blow off. Of course, not as loud as when it is under load, though. I have mine set to a pretty HARD setting, I like the aggresive whoosh vice the whistle, although it's not as apparent to other people.

 

Yeah,but don't set the spring too soft or you'll vent boost when you don't want too.

And I would go with the HKS SS BOV,even though I have the Greddy on both of my turbo cars,I think the HKS is a better unit. If I had it to do over again that's what I would do.

 

How do I know what the best adjustemt is for a BOV? What is to soft and what is to hard?

I want defenitly a loud short wwooossssshhhhhhhhhhh, yes, that is what I want, to scare all the peoples!

 

Too tight will create a lot of pressure in your IC piping, causing the air to fight against the turbo (compressor surge) which is a bad thing.. you can really damage a turbo this way.

 

Correct me if I'm wrong, but I thought compressor surge was when the throttle body closes and the air doesn't vent fast enough(through the BOV) causing it to flow back into the compressor. In that case, a too soft a spring causes compressor surge, not too tight(hard).


[Modified by integracon, 6:12 PM 2/7/2002]

 

Does anybody have a sound clip of either the HKS or the greddy....Thanks

 

HKS SS with the purple insert its really soft, good for sneaking around

 

Hard/tight means it takes more of a pressure difference between the piping and manifold for the BOV to open.

Dustin

 

That's why he's da boss man.

Look above,I said UNIT. lol

 

So the setting of the spring has nothing to do with the BOV's ability to vent boost between shifts? My thinking was that under a softer spring setting, the BOV bled the pressure off slower creating the louder/longer Blow-off sound vice the Hard settings sudden and quick whoosh sound.

 

Softer spring makes it easier for it to vent boost... even if you do not want to.

Have you ever looked inside a BOV to see how it works?

 

No.. the spring and its adjustment have everything to do with the way a BOV vents boost between shifts. The screw, depending on which way you turn it, will either put more pressure on the spring (making it harder) or backs off the spring (making it softer). The valve that's connected to the spring will open easier when the spring is softer.. so if the spring is too soft, as boost is building, some of the boost will leak. If it's too hard, all that pressure will stay in the piping, possibly causing compressor surge, until enough force pushes the valve/spring to open and let boost escape..causing a louder blow-off.

 

I love my Greddy Type S. Its pretty loud at only 1psi and can be heard clearly by the person driving next to me. If you take it up to 5psi, you can really scare the shiet outta some people.
In fact, I tried it out this morning while in light traffic on a lady holding a cig out the window(I guess to prevent smoke from getting into her car ). Slowed down to a about 20mph so I would be at here window when I let off. So I stomped on it and let off at only about 2psi, which was quite enough to scare her into dropping the cig and shooting the finger at me. Mission accomplished!!! I love my Greddy BOV.

 

That are good news! Canīt wait to hear mine at 18psi

 

Dustin: You got any sound clips of the your new hks racing bov?