Which Blow off valve creates the feathered release sound?

[NightRider97]

I've heard these BOV's on mustang SVO's and really like them. Personally I like it better than the whipping sound created by most other BOV's. Which ones create this feathered (staged) release sound?
I know its a stupid question, but I dont know much about this stuff.

 

[allwheelTSI]

A sequential BOV will make the sound you are describing.,

 

[absolute_DSM]

No, compressor surge will cause that sound.


allwheel - Find a proper HKS SSQV clip on YouTube. They shouldnt flutter.

 

[NightRider97]

Yes, flutter. That describes it better.
So thats not a good thing then? Its actually a problem with the turbo causing that sound? darn. I really liked how that sounded.

 

[slowgsr]

No, compressor surge will cause that sound.

Ditto.

On my old turbo car, if i was crusing in 5th and just got on it a bit (50%)and just built maybe 2-3lbs of boost (just out of vac) and i let off about half way (enough to go back into vac) then i would get that sound.

Under full throttle shifting at full boost you shouldnt get any sort of that noise, antisurge compressor housings sound cool though! And the BW bullseye turbo's sound awesome too when they spool, i know its completely irrelevant to what you were talking about but just felt like id mention it.

 

[absolute_DSM]

Yes, flutter. That describes it better.
So thats not a good thing then? Its actually a problem with the turbo causing that sound? darn. I really liked how that sounded.

I laugh at people that when their car sounds like that. Means they dont know what they are doing.

I dont think any kind of performance mod should be made for a sound.

 

[NightRider97]

I laugh at people that when their car sounds like that. Means they dont know what they are doing.

I dont think any kind of performance mod should be made for a sound.

Yea, I hear ya. But as far as Im concerned, any of those wacky aftermarket BOV's are just silly sound makers. I mean asside from their better pressure capabilities, what's the reason for making them so loud?

 

[RallyEclipse98]

Turbo XS. Loudest aftermarket BOV and makes a "fluttering" sound when you let off slowly.

 

[tkelly27]

Yea, I hear ya. But as far as Im concerned, any of those wacky aftermarket BOV's are just silly sound makers. I mean asside from their better pressure capabilities, what's the reason for making them so loud?

2 b supa 1337 and scare old ladies walking down the street! Yeah, generally any BOV with a horn on the outlet is one that's been designed for higher pressures modified to make a lot of noise.

Is this the sound you were looking for?
YouTube - compressor surge says what
YouTube - Compressor Surge Demo

can sound kinda cool on race cars, but it's bad for the turbo.

An SSQV can only make two types of sounds, neither of them flutter.
YouTube - MR2 Turbo HKS SSQV New Design BOV

There was a subaru shop near where I used to work, they had them on every car that came out of their garage. Not a single one made the flutter sound, rather the shriek that they are known for.

Any time you hear the fluttering sound you're getting compressor surge. I have a RFL on my own car (home depot recirc kit FTW!) and the only time it ever flutters is when I've got too much spring pressure or when I've got it disconnected. Too much spring pressre will cause surge at low boost settings (not enough pressure to pop it open) and leaving it unhooked is basically not running a BOV atall. From 0-18psi I've not found it to be nearly as loud as a 1G BOV either. *shrug* as they say, your mileage may vary.

 

[absolute_DSM]

More noise (does not equal sign) does not equal performance. So who really cares?

"Welcome to DSMtuners.com - for the serious Talon, Laser, and Eclipse performance & racing enthusiast!"

 

[pawz1200]

AMEN Absolute!!! I just laugh everytime these kids think it is cool. Just wish I could be there when their turbo takes a dump !!

 

[mitch26753]

flutter=bad. you will have to recirculate your bov anyways, and when you do that you can barely hear the bov anyway. Only way you are going to be able to vent to atmosphere is with a maf translator or a similar setup. Sorry to burst your bubble, buy one of those things that hook to your exhaust to make it sound like a BOV.

 

[RayBan GST]

A sequential BOV will make the sound but make sure you are connecting it properly


sound does not matter / performance does

 

[jaday]

I agree with what everyone is saying in here about performance being the bottom line. All I want to add is that if there are different BOV's or whatever other type of mod that net about the same performance, the OP should be able to make his decision on something else, like a particular sound he likes... Don't people do that a lot with catbacks? Yes, this sound means compressor surge and is bad, but if someone wants to be noisy and attract attention, as long as its not detrimental to performance, it shouldn't be frowned upon... It's just a different personal taste.

 

[absolute_DSM]

Yes, this sound means compressor surge and is bad, but if someone wants to be noisy and attract attention, as long as its not detrimental to performance, it shouldn't be frowned upon...

Compressor surge IS detrimental to performance. Enough surge and kiss that turbo goodbye.

 

[iwannagofast89]

I agree with jaday I would rather have something I like to hear everyday then something I hate to hear

 

[spawn7037]

Correct me if I'm wrong (and I'm sure some one will), but if he wanted to he could just put the 1g bov on his car and forget about it. It seems stupid to try and draw attention to a car that might get you in trouble w/the law in the first place.

 

[hahnsuper16g]

To the poster that started this thread I am running a fp3052 with the greddy type rs BOV and i have it set pretty hard as i am boosting 22-24psi and i get that sound. As long as you have your car tuned properly you can get that sound and be fine. Posters kill me with the you have to recirculate your BOV or it is going to blow your car up etc. I am running a apexi power FC and i have mine vented to the atmosphere. I am not running a maft and my car runs and idles great and i have a fully built everything. I't depends on your likes. I mean i agree on preformance being a top priority but I also like the flutter and my turbo happens to come with anti surge ports. I mean people that buy v8s don't buy them to make them sound like hondas. You can have the best of both worlds and if that's part of what floats your boat then more power two you. My car makes 3 different sounds. If i am at idle and i just rev it you don't even hear the turbo or the BOV. If i am cruising and i let off the throttle it flutters and If I drop the hammer and the wastegate opens it becomes a stalk raving screaming demon. Look at my numbers and dyno sheet and see that i have the performance and the sound. I have heard the flutter on big end performance cars like the titan motorsports drag supra as well as many others so i don't think it's as big an issue as people are making it out to be as far as hindering performance. I mean you can set your BOV too soft and not get that sound but have a boost leak or idle issues that way as well.

 

[Dagda]

true.

however if you dont feel like spending 200 on a blow off valve, and 20 for a flange for it to fit your UICP, you could just buy a 1st gen like someone else mentioned. thats what i have, and even recirculated its very loud and noticeable, and never flutters

 

[SiNiST3R]

I'm very unhappy with greddy I have the newer version the RS and it flutters a tad ie 2-3 puffs every shift. I tried evrything I think to stop it. pull out 1 spring and set the screw all teh way out for the softest to putting the second spring back in and tighting it the the hardest. still cant stop it. so dono I learn to live witht he nosie had a 14b wthat noise on for about a year. no probs, have 16g on now and same problem.