Has anyone been able to get their BOV to sound like this?

[GAspeedProtege]

http://www.935motorsports.com/media/HKS-SS.wav

So far all I've heard is a woosh sound, no high pitched whistle.

[MetalSpeed]

I believe you can get that sound doing a dual valve set up like 505Zoom did that's what I am doing soon. You can do a search in how to kill turkeys.

[GAspeedProtege]

I've heard his sound clip, maybe it's from where the mic was, but it sounds nothing like the clip. It's the whoosh I hear from every MSP sound clip. The other turbo proteges are able to get the high pitched whistle sound, why can't we?

[jersey_emt]

This is my setup (stock BPV recirculating, GReddy Type S open vent)

http://www.msprotege.com/members/jersey_emt/greddy_bov.mpg

There's a whistle, but it's at the trail end of the BOV sound with the GReddy Type S. If I had the SSQV it would be all whistle.

[MetalSpeed]

maybe it is harder because we have a recirculating turbo?(lurk)

[DiscreetSpeed]

that car is pushing mad psi....lol stock boost on a greddy bov isnt enough to bring its sound out...lol you should here a rfl at low boost..sounds like a little bov...
so more boost = louder nicer sound

[jersey_emt]

that car is pushing mad psi....lol stock boost on a greddy bov isnt enough to bring its sound out...lol you should here a rfl at low boost..sounds like a little bov...
so more boost = louder nicer sound
If I take my time shifting and let the BOV do it's thing, it has the typical GReddy whistle ;)

[Pirana]

There is a guy on DFW, with a blue MSP that uses a GReddy, and it has the loud high pitch whistle. Sounds freaking awesome. He also has a hardpipe set up. I wish I could record his sound, I had the HKS SSQ, and didnt get the sound I wanted.

[GAspeedProtege]

Find out what he has done! hehe, so far the greddy ones have a woosh and the hks has more of a whistle, but that's just what I've heard so far.

[GAspeedProtege]

whats responsible for the noise anyway? Just the amount of air going through it? Cylinder size? Weight of the piston?

[DZnutz]

ok i cant even make sense of anything in this thread... what are you asking?

if your asking if thats how an HKS SSBOV should sound then yes... keep in mind that there are 2, other than the stock, inserts that you can use with the HKS to change its sound... the clip you posted sounds a lil higher pitched than the stock one so im guessin its using one of the extra inserts, but then again it could just be the placement of the mic thats throwin me off (i dont drive with my head in the engine bay (silly))

[GAspeedProtege]

Ok, so far all of the sound clips of MSP's with aftermarket BOVs have sounded like a whooosh(just air escaping, no whistle). I want to know if anyone has been able to get their aftermarket BOV to sound similar to the clip, I don't care what type the clip was to give you an idea what I am talking about. I have heard BOVs from other turbo P5's and MP3's that have the high pitch whistle. How are they able to have that sound while MSP's cannot? Is it the wastegate, piping, intake, turbo? How can it be fixed so that it does sound similar to the clip? That is what I am asking.

[jersey_emt]

You would need the same BOV. A lot of people have been putting the GReddy Type S on their MSP's, I haven't heard one with the HKS SSQV in a long time.

[spacemonkey]

I dont think 505zoon BOV sound like that....

Im sure you can get that sound if you weld your BOV to hardpipes and run 30psi. The reason why they dont sound spectacular is becasue were only running like 7 psi or so. Think of the air going through a BOV at 7 psi vs air going through a BOV at 30 psi. Thats scary. Turn up the boost and it will sound better, but risky. Welding a BOV flange to pipes will help too.

A very good clip to hear is JDMsam...his set up is a complete mystery but he has video of his HKS SSQV and it sound amazing...hes not running the dual BPV/BOV set up. So PM him and get some info...I wish my car sounded like that too.

[GAspeedProtege]

I'll give it a shot.

[vodapas77]

Yes, this is possible. nemasis was able to do it on her MSP. Same exact screech/whistle sound. Just not quite as long duration, but as Discreet said that's because we're not pumping mad amounts of boost through our cars. Her set up is runing with a A Spool FMIC and Greddy Type S BOV vented to the atmosphere. I'm currently babysitting her car and as such I've driven it a little here on base. I expected it to stall out on me like crazy. Boy was I wrong. Just a minor adjustment in driving style and no problems. Seriously makes me rethink running the BOV/BPV set up. I might just vent to the atmosphere too. Sounds a lot better.

[spacemonkey]

I'll give it a shot.Which one...finding JDMsam, getting harpipes or the best solution...running 30psi! LOL

Its possible to run just greddy BOV and get the sound but you'll most likey experience stalling problems and alittle turkey. The second BPV or BOV is to cathch the "shockwave" of air coming back...whatever wasnt caught by the 1st BOV. I will be trying a 2 BOV (both venting) set up since I dont really stall with my ForgeBOV...gotten use to it. Just place a order for my Greddy BOV and I'll find some pieps to weld.

[GAspeedProtege]

Talk to jdm sam

[DZnutz]

You would need the same BOV. A lot of people have been putting the GReddy Type S on their MSP's, I haven't heard one with the HKS SSQV in a long time.
jersey hit the nail right on the head... the only BOV that makes that distinct sound is the HKS, what you need in order to get that clean sound is to run the HKS BOV (alone, vented) on hardpipes. the HKS is capable of reproducing that sound with as little as 5 psi... i know since i was running my rx7 at 10psi with the stock factory BOV (in parallel/assume 5psi per BOV) and the chirp is very loud. good luck

[GAspeedProtege]

Thanks, DZnutz, and everyone else.

[spacemonkey]

HKS has that distinct sound which is why I love it so much...and since its pull type BOV it doesnt leak by design. Well they leak if the seals are bad. Piston and push type usually need to be cleaned and sometimes get stuck (depending on which you get)

I just was sold on Greddy because I wasnt planing on runnngin high boost. Its alot sheaper. And the greddy also whistles...it has more of a whistle and air sound. The HKS has a high pitch chirp...which is distinct. They also have insert that change the pitch. But I've also heard that sound can be duplicated on any BOV with HKS inserts. If you comapre the old skool HKS and the new SSQV...I believe its the same thing minus the outter shell. Not sure if that info is correct...its just pictures I've seen at Blowoffvalve.com

[TX Speed Demon]

There is a guy on DFW, with a blue MSP that uses a GReddy, and it has the loud high pitch whistle. Sounds freaking awesome. He also has a hardpipe set up. I wish I could record his sound, I had the HKS SSQ, and didnt get the sound I wanted.

Bring a camcorder to the weds meet and tape mine. I took off the adapter and tightened up the spring A LOT. Now I've got a loud ass whistle and the car WILL NOT STALL. Every time I set it off (even accelerating up to 5500 rpms and dropping into neutral) the rpms drop to 700-900 now and stop dead. No more bouncing off 0. I can set it off under idle and it doesn't even come close to stalling. we'll go for a ride and I'll show you, it's much louder under driving boost than setting off idle. If I leave on the 19mm outlet adapter I get only the woosh sound and no whistle, but I think I also hear the gobble come back a bit. The adapter seems to be restricing the air flow and causing the compressor surge to return for a split second before the air forces it's way out.

If you listen Jersey EMT's clip, the very last part where you here the whistle and woosh is what mine sounds like, but mine is much much louder, especially the 2-3 and 3-4 shifts.

[TX Speed Demon]

Here's the clip of Julio's car, the blue MSP with the Greddy on a hardpipe.

Type S BOV clip (http://www.members.aol.com/jdmsamx/greddybovmsp.mpg)

This is the same set up I have and sounds very similar. Mine's not quite as loud under idle since the springis tighter and I have to rev harder to open her up, but mine doesn't come close to stalling at all like his does.

While driving mine is now easily as loud as his even with only stock boost vs his 9lbs, and again it will not stall. The only time the warning lights flashed was one time when I slipped the clutch in second gear up to 6000 RPMs and dropped it into neutral. This happened cause with the clutch in the BOV never really seals completly. If I put the car in gear and rev it up to 6000 RPMs and drop it into neutral the BOV is hella loud and there are no stalling issues at all. The revs drop to 700-900 RPMs and stop dead. The BOV seals earlier now which completly gets rid of the stalling problem.

[TX Speed Demon]

This is my setup (stock BPV recirculating, GReddy Type S open vent) There's a whistle, but it's at the trail end of the BOV sound with the GReddy Type S. If I had the SSQV it would be all whistle.

You don't get enough of the whistle cause you're not pushing enough air through the Greddy. If you take off your recirulating BPV your whistle will be much luder and followed by a rush of air. If you don't want to stall just losen the lock nut at the top of the Greddy, use a 7/64th allen/hex wrench thingy and tighen the spring until only 5 threads are left on the top of the screw. Then re-tighten your lock nut and go for a drive. I bet you won't stall even when doing neutral drops from over 5,000 RPMs.

I got tired of altering my driving style and worrying about stalling with my greddy so I tinkered around with how tight to make it and found this to work best. I've only been testing it for 5 days, but I can't even make it stall. Even when I shift to neutral and leave my foot on the clutch pushed all the way in all it does is bounce. If I do a drop from +5000 RPMs into neutral and take my foot off the clutch the rpms stop dead at 700-900 and never bounce. I also no longer have any idling problems. Before the rpms would occasionally drop for a second when idling for no reason. Since I tightened it up it hasn't happened once.

[jersey_emt]

You don't get enough of the whistle cause you're not pushing enough air through the Greddy. If you take off your recirulating BPV your whistle will be much luder and followed by a rush of air. If you don't want to stall just losen the lock nut at the top of the Greddy, use a 7/64th allen/hex wrench thingy and tighen the spring until only 5 threads are left on the top of the screw. Then re-tighten your lock nut and go for a drive. I bet you won't stall even when doing neutral drops from over 5,000 RPMs.

I got tired of altering my driving style and worrying about stalling with my greddy so I tinkered around with how tight to make it and found this to work best. I've only been testing it for 5 days, but I can't even make it stall. Even when I shift to neutral and leave my foot on the clutch pushed all the way in all it does is bounce. If I do a drop from +5000 RPMs into neutral and take my foot off the clutch the rpms stop dead at 700-900 and never bounce. I also no longer have any idling problems. Before the rpms would occasionally drop for a second when idling for no reason. Since I tightened it up it hasn't happened once.
Thanks!

I've found that with the BOV tightened pretty well, I got a great whistle when shifting at high RPMs, but the turkey came back when shifting at low and mid-range RPMS (under ~5K).

With it loose, no turkey at all, but the RPMs dropped pretty low if I shift to neutral (almost stalling).

I have it fairly tight, but not incredibly tight...the way I have it I get turkey if shifting below 3K, and a WOOOSHPSSHHT over 3K.

The weird thing is, if I am light on the throttle and only boost a tiny bit (like 2psi) I just get a whistle with no woosh.

[TX Speed Demon]

1) I've found that with the BOV tightened pretty well, I got a great whistle when shifting at high RPMs, but the turkey came back when shifting at low and mid-range RPMS (under ~5K).

2) With it loose, no turkey at all, but the RPMs dropped pretty low if I shift to neutral (almost stalling).

3) I have it fairly tight, but not incredibly tight...the way I have it I get turkey if shifting below 3K, and a WOOOSHPSSHHT over 3K.

4) The weird thing is, if I am light on the throttle and only boost a tiny bit (like 2psi) I just get a whistle with no woosh.

These are with the dual set up right?

If so here's why:
1) your stock BPV is taking away the air necessary to fully open the Greddy at lower RPMs (under 5000). At upper RPMs there is enough air to properly open the valve (whistle sound) and extra left over to rush out (woosh sound). With only the greddy running like me you'll get your loudest whistle and woosh with shifts around 3500-4000 rpms. After that the sound seems to decrease, but it could be the engine noise is just getting louder.

2) With it loose the greddy does not re-seal itself quickly enough. so it actually lets out too much air. I think this would be true with a dual set up, and know it is with only the greddy and no bpv. When you tighten it up the spring forces the valve to close sooner keeping enough air in the system to prevent stalling

3) This is from your stock BPV not reacting sensatively enough to prevent the turkey, and stealing air away from the greddy so it doesn't open soon enough to prevent the turkey as it would if you ran it by itself. If you find a way to loosen the setting on your BPV you theoretically shouldn't have any turkey at the lower RPMs. The only way I see to test this would be to replace the stock BPV with a different BPV that you could adjust.

4) this is because you have enough air to open the valve and freely flow out thus creating the whistle, but not enough to force it's way out the greddy causing the whoosh sound. This happens to me when cruising at around 3000 rpm in 5th gear and shifting to neutral. I get a tiny whistle for a second as some air gets out, but no woosh since the amount of air is less, and the spring forces the valve to close early thus preventing the woosh.

If you remove your stock BPV you will need to tighten your greddy to get the similar effects you have now since all the air will be forcing it's way out of 1 opening instead of 2.

[TX Speed Demon]

If I had the SSQV it would be all whistle.

If you ran an HKS SS with the stock BPV recirculating it would more like a quick chirp and that's it. JDM Sam had one on his stock piping with the BPV removed and personally I think it sounded pretty dumb. Kind of like a squirrel under his hood. I think a dual set up would create a similar sound do to the lack of air forcing it's way out of the HKS.

Now that JDM Sam got a hard pipe the HKS SS sound GREAT. under idle it sounds like a small whip cracking with the big rush of air afterward. When driving you get the chirp with an even louder rush of air afterward. Very nice.

[DZnutz]

jersey hit the nail right on the head... the only BOV that makes that distinct sound is the HKS, what you need in order to get that clean sound is to run the HKS BOV (alone, vented) on hardpipes. the HKS is capable of reproducing that sound with as little as 5 psi... i know since i was running my rx7 at 10psi with the stock factory BOV (in parallel/assume 5psi per BOV) and the chirp is very loud. good luck
i say again (thumb)

[MetalSpeed]

How would this work with the Injen CAI? Would it be any different? Would it stall?

[JDM Sam]

Rice you, rice you very much. High pitch queef anyone?
My hks clip is around here somewhere just type in hks bov vid clip and you should find it with me as the thread starter.

(whip) (ricer)

[KyRaceFan]

I raed about half of this thread before i responded, so dont flame me...

MY HKS SSQV flutters and has a nice hiss when im shifting at 1-2psi, a louder flutter hiss at 3-4psi, and anything above that the chirp gets louder and louder.
Thats the way it SHOULD sound at higher boost.
I have the nut about halfway open, very limited amount of stalling. Once a month, when i forget to rev match down when im shifting

Today i just switched the vacuum source to the brake booster line, and it does seem to not flutter as much, but most of the flutter is just the BOV opening since its a Pull type, and requires a sudden pressure change to open. :)

Hope this helps.

[WillisW555]

I loved the WRC cars BOVs. They sound the best, but they run pretty high boost I think.

[spacemonkey]

For those who missed what causes the fluttering and if its harmful...here is the thread I posted: http://www.msprotege.com/forum/showthread.php?t=56075

If it flutters your BOV spring is too tight and isnt venting enough. Or you might want to install another BPV or BOV to catch whats left of the flutter like what 505zoom posted. I noticed some are hooking up to the break booster line...I think this is how it works. The stronger vacum source pulls the spring back better...so thats why it reduces the flutter. The vacume line is stronger allowing you to run stiffer springs. you can pretty much loosen the spring and have the same effect. If it still flutters that means your BOV isnt catching the "shockwave" of air coming back from the throttle body. Second BPV or BOV should get rid of the sound. But I also believe a little flutter wont hurt the turbo as the Nissan guys explained in my thread. It will make better sense when you read what Nissan Infiniti Owners Club posted in there site. For those how have adjustable BOV...its amatter of fine tuning it to see where you want it. So just play around with it.

[JDM Sam]

Flutter is GAY!

[spacemonkey]

That maybe but everyone I've met loves it. Especially the drifters on Drift Day. I keep changing my mind back and forth...turkey or no turkey. I hear HKS SSQV, Greddy and TurboXS everyday...it gets old. No one really hears the flutter...some guy wanted to buy the BPV off me cuz he thought it was my BPV. But if I had to choose I would go for the HKS SSQV

[KyRaceFan]

Flutter is GAY!
i was out driving with a fully built sr20, that has an HKS, and guess what his BOV sounded exactly like mine.
Turbo Cars flutter.
GET OVER IT.

[spacemonkey]

Alot of Japanese turbo cars are designed with the flutter. The CA18DET (Nissan 180sx) are built with no BPV or BOV. Thats why the hardcore JDM guys want the flutter.

But back on topic...how is the Greddy BOV going? Should be getting mine later this week and about place an order for a 19mm adapter from bolwoffvalves.com. very interested to see the outcome and sounds

[t3ase]

Thread moved to MSP Forced Induction.