How exactly do I adjust this BOV, if it is adjustable? I installed my 3 inch charge pipe with the SSQV. I got a noticeable gain from the 3 inch piping. Butt dyno feel like the boost kicks in quicker than it did before and a little harder. Either way, my situation: I'm running the 3.25" Pulley. I bought this BOV because I thought it would sound sweet. I was right, however, I revved it up a few times upon first installing it and had to take it up into Higher RPMS to get that nice whistle sound the turbo guys get. Anything below that is a woosh like my blitz. Now, I can't even get that whistle anymore. I'm stumped. I'm revving it up high like I did the first day, but now its not whistling, it's just "wooshing". What happened here? I checked for any boost leaks, no leaks. This BOV is adjustable right? Could that get me that aggressive chirp i'm looking for? Thanks. (Yeah, I know it's a bit of a ricer topic, but you'll get over it).

 

I have this blow off valve, and I was under the impression you are not suposed to adjust it...it may hurt the diphram or something like that? I would check on HKS's web site. I have never had a problem with mine not blowing off.

 

Why would it not be adjustable if it can be adjusted? The woosh sound is the sound of air being forced backward through the blower, surge. The HKS ssq isn't the ideal bov for a sc maxima. The blower only makes peak boost at higher rpm's, thats why it doesn't whistle . I had one and didnt like it much

 

That is the same info I have read before, don't adjust them. They are designed differently than most BOV.

Love mine

 

Hey mike it would be great if you could make your signature large enough to take up my entire monitor - oh wait you already did!


BTW don't adjust the SSQV, they aren't meant to be adjusted. I wouldn't get too wrapped up in the noise your BOV makes.

 

Thanks fellas. BOV IMO with SC all do the job. Some a little better than others. This is why i'm making the "sound" a determining decision in which one I stick with. I'm collecting them it seems like. I have a blitz on a pipe and SSQV on a flange.

 

I had one, I adjusted it. A friend of mine put it on his turbo application and gained a lb. of boost. If its not adjustable then you would agree it is perfectly adjusted for every car

 

it is not desinged to leak any air at idle like mos BOV, so there is really nothing to adjust.

 

Well, it has a screw and a nut on it. I used it to adjust the bov. By changing it I noticed a difference in low end response. I like the blitz much better. And by not leaking any air at idle the HKS imo is not the best of bov's for the maxima sc set up

 

And how can you quanitify an increase in low end response????? Can you either prove it or at least prove it in theory.

 

From HKS them selves

thank you for contacting us regarding your HSK Super Sequential Blow-Off Valve. I hope the following answers your questions.

1.) The blow-off valve should never make any sound while accelerating. The only time it should ever be audible is when it's activated by throttle lifts. There are some cars that will experience a vacuum/pressure/vacuum/pressure change in the manifold under part-throttle lifts. This rapid positive to negative pressure change can cause the valve to open and closed repeatedly, giving you this "fluttering" sound that you described.

2.) Yes, all of the Super Sequential Blow-Off Valves are universal, and all of our vehicle specific kits use the same valve.

3.) If you are recirculation the valve on your EVO and are still experience "stumbling" problems, I would check the installation. Make sure the rubber O-ring is in good condition and is seated properly. The second thing to check is the C-clip (expansion ring). The C-clip has a top and bottom to it. If you look closely one side has a flat surface, and the other side has a round surface, be sure that the flat side goes towards the flange (O-ring side) and the round side towards the valve. You will need C-clip pliers (expansion ring pliers) to do this.

4.) Do not touch the nut on the back of the valve ! (I wish we never put that on there ! ) Adjusting that nut does NOT change the opening rate, efficiency or timing of the valve. HKS valves are "pull-type" valves, meaning they have to "pull" open against the boost for them to open. The more boost you run, the more the boost pushes them closed. Some vehicles have more vacuum than others. If high enough, it is possible for a vehicle's vacuum at idle to accidentally pull the valve open, causing a vacuum leak. It is for this reason that HKS employees an adjustment nut on the back of the valve to allow the spring tension to be adjusted, ensuring that the valve is closed and not leaking while the vehicle is idling. If you have played with this nut, I would suggest getting it back to the middle adjusting point while being VERY careful NOT to let the nut fall out, or turn it too tight as to puncture a hole in the blow -off valve diaphragm. As long as it's not leaking at idle, your fine.

5.) To test your blow-off valve, start the car, let it idle, and open the hood. While looking at the valve, rev the car quickly once and stop. Although no boost is ever generated at idle, this throttle on-off sequence should be enough to engage the blow-off valve, and you should be able to se the valve actually open and then close. If it does not do this, check all that I have mentioned above.

If you are still in need of assistance, please feel free to contact us.

Thanks


Ryan Bates
Sales & Tech
HKS U.S.A., Inc.
(310) 491-3307
]

 

Im just telling you what I thought changed by adjusting the bov. It basically changed the sensitivity which seemed to effect the throttle response and drivability. In your instructions from HKS it states to rev the motor and by doing so creates no boost. That must be referring to a turbo application. The sc maxima makes boost by reving the motor. The blower is creating positive pressure at idle. I adjusted the HKS from all the way tight and all the way loose and everything in between.. I like bov's that release air at low rpm/at idle.

 

Here's the deal...

Although I told you this by PM, I'll share this with the group....

The BOV whistles when you shift above approximately 4000 rpm due to the amount of pressure built up in the system. As far as an adjustment screw, there isn't one. If you see an adjustment screw on a new HKS BOV, that's a dead giveaway that's it's a knockoff, and not a genuine product. The original HKS BOV from years ago had an adjustment screw, but they did away with it. The ebay knockoffs are poor replicas of the original design. I know this because my HKS BOV on my Supra has an adjustment screw (bought it over 3 years ago). This is what HKS says about the current BOV:

The Super Sequential BOV is a pull type relief valve, unlike other BOV's which are push spring type & are prone to leaking. The SSBOV is actuated by pressure alterations only, ensuring quick valve response & complete closure during idle. Standard BOV's must utilize large valves in order to accommodate high boost/power application. However, these large valves react slowly & require high activation pressure to open. Smaller, fast reacting valves, do not permit the air flow required for high horsepower. The SSBOV incorporates both for maximum performance. It is engineered utilizing a small primary valve for ultra quick activation along with a secondary valve for additional relief capacity. The SSBOV is made of billet aluminum & emits a unique, aggressive sound.

BTW, I just read an interesting article in MODIFIED Magazine last night and they analyzed a HKS SSQV replica (ebay knockoff) to the real deal. Although they looked the same, they did not perform the same. Darn thing couldn't hold any boost. Major leak problems to say the least.

Anyway, I'm not sure if there is a spring inside to be adjusted/replaced. I know ewuzh and Stephen Max have taken thier Blitz BOV's apart and replaced the spring with soften ones so it blows off better (holds boost properly w/o leaking etc), but you should ask them/and or search and look for more information. Hope that helps.

 

Okay, well I took the car around for a drive and it does make the aggressive chirping sound 80% of the time. Just sitting there revving it won't do it, although it did the first night it was installed. Not leaking air at idle and causing compressure surge means d**k since compressor surge isn't a bad thing for SCs from what I've read on here.

 

I think compressor surge makes for bad drivability, basically what the bov does for the sc maxima..

 

OMG… Thanks to the Wizard I just realize that I also have the original HKS BOV that has the adjustment screw. I thought all SSQV BOV had the screw in the back, but now I know…LOL Maybe it'll be better for me...

 

I thought they all had the screw for adjusting?? Dang, I must have had the adjustable...

 

No, mine doesn't have the adjustment screw and I'm glad. My BOV is just fine. What kind of driveability issues should I be looking for? Car has been driving allong just fine. I get on it more just to hear the BOV, sounds sweeeeeeeeeeeet! Ghase, as mentioned before, you're better off not having that adjusting nut as you can ruin your BOV if done wrong. HKS themselves stated above they don't even know why they put it there. Bad idea. I'm happy. My car makes that aggressing chirping sound when I drive and let off, not when I rev it at idle. Although it actually does it a few times at idle. I'd say half the times I rev up at idle it does it.

 

Update on this:

It sucks now that i'm 5spd, LOL. 1st gear sucks, I take off and immediately put it in 2nd gear because all you hear is foooom out the SC. With the auto, compressor surge was hardly noticeable. Now with the 2.87, and 5speed it is very noticeable in the lower gears. It's almost annoying. I wish they vented air at idle because it just sounds so friggin good.

 

I drove around a bit and my belt just slipped off completely. I swear it was fine when I was driving it hard as an auto. Now it just slipped off unharmed. Can compressor surge do this? Since its trying to spin the blower in the opposite direction? Anyway, drove with the belt off and it felt great. Driveability was the best without compressor surge. I really need a new BOV that vents air at idle.

 

Just a side note - I figured out some time ago that the "fluttering" everyone hears on their BOVs is actually compressor surge.

It's really noticable if you have a CAI since the sound comes from a different area then.

 

Yeah, in first gear all you hear is FOOOM! When the air comes back out the blower. Car isn't smooth at all in 1st.

 

Its funny because if you read on any website about the SSQV, it explains that it has Three valves. One opens under a certain Vaccum and one opens at another setting, while the other shuts, pretty much eliminating compressor surge.

Here with diagrams: http://www.hksusa.com/products/more.asp?id=792

Compressor Surge is quite normal with a supercharger setup like the one on the Maxima and really isnt bad, pursay, on the blower...just annoying if you ask me. I got surge with my tiny Greddy BOV and with my Big Vortech Race I currently have, but not as much....If I loosen the Vortech up a lot to vent a good amount of air, I wont get surge but It needs to be tight because my Z32 MAF needs to read air at idle...If I vent too much, the idle is messed up...I havent found a good medium between the Z32 reading air, and venting...I need to mess around with it more.

If I remember correcty, Stephan Max uses the Vortech Mondo, and has no compressor surge. That's a HUGE BOV !!!

 

IMO...Blitz on 12psi soundsreal nice ..just dynoed 330 whp at 92 degrees outside temp!