hks ssqv bov bov flutter

[queenskid926]

I just installed a real hks ssqv and all I'm getting is flutter dump. When trying to boost, all you air is the flutter from the air going against the turbo and it is very audible by the filter on my intake.
I have the vacuum source from the stock location and it is getting vacuum. On my boost gauge I'm reading about 20 vacuum at idle.
Any ideas? Should i just use another vacuum source?

 

[SupraCorwin]

Have you heard a ssqv before? Because almost all of them sound like you are getting some kind of flutter, its just what they sound like, mine does.

You can also go on you tube and search for videos of what an ssqv sounds like, or what compressor surge sounds like.

 

[queenskid926]

Yes i have had one before on a diff car, Its defiantly compressor surge because when i unhook the line going to the bov its no difference,. put the stock bov back one, no difference.

So am i getting enough vacuum? bad vacuum source? i have it off off the stock bov vacumm line

 

[SupraCorwin]

Im no expert, but if you get vaccum in somewhat normal levels and it doesnt matter if the BOV is hooked up or not then i'd say the spring in the BOV is to tight, or set to a psi your system doesnt reach, so it never opens. You could try the bov on a different car, or hook it up to air hose to see if it opens.

 

[dumbo]

Are you getting surge when your WOT(I don't know what causes that), or are you getting flutter/surge(Personally, HKS SSQV SUCKS!) when you let off the gas??

Two very different problems.

EDIT: Just re-read your post, and I would consider trying a different vac source, or closely inspecting your vac lines to your bov, because if it makes no difference when the line is disconnected, it leads me to belive your not getting sufficient vacum.

 

[tbcmorris]

It sounds like you have the problem that makes these BOV's garbage as I say everytime someone question the compressor surge there getting. May I kindly sugest you throw it in the garbage and get a bov that does it jobs of stopping surge venting unneeded compressed ait and protecting the turbo....itstead of one that makes a cool noise?

 

[queenskid926]

It sounds like you have the problem that makes these BOV's garbage as I say everytime someone question the compressor surge there getting. May I kindly sugest you throw it in the garbage and get a bov that does it jobs of stopping surge venting unneeded compressed ait and protecting the turbo....itstead of one that makes a cool noise?

which bov would that be? the tial? synapse? im going to do an exsperiment, take off the intercooler pipe that its hooked up on, cap off both ends and and pressurized it with my boost leak tester, and hook up the vaccum line to my friends car and see if it blows off, if it does , then the bov is good, if it doesnt then its the bov.

 

[tbcmorris]

I sugest a tial bov. I have had the same tail for 5 years on 4 different cars.

 

[crisp]

Personally, I've had the EARLY HKS SBOV and the NEWEST HKS BOV. BOTH have worked flawlessly for me, although the SINGLE action LARGE mouth original blew-off "more abruptly", the sequential is more responsive and quicker to relieve pressure.

I know I'm "biased" toward HKS components, but NOT necessarily "ALL" of their products against others... but I've had very good results with my BOV's from them so far, and NO flutter as you describe, unless I am "whistling" between vacuum and boost transition... but very little "flutter", always a good air dump.

I think your vacuum or plumbing in general on the valve is suspect.

Personally, I've been in VERY "fluttery/jerky" BOV behaviored cars, and both cases were either plumbing, or the spring too "tight" to allow proper relief on off-throttle.


G/L!


-crisp

 

[queenskid926]

Ok narrowed it down a lil bit. Its the vacuum on the my motor thats suspect.

I have a boost leak tester so i just pressurized that one pipe, and hooked up the vacuum from almost anything I could find on the 7m and it would not blow off. I did the same thing , pressurized that one section of intercooler piping, and plug up a vacuum line from my nissan altima, while at idle, blows off every time, so at least now I know its not the bov.

heres a few pics to describe.

so now off to double and tripple check my vaccum lines

 

[dumbo]

It sounds like you have the problem that makes these BOV's garbage as I say everytime someone question the compressor surge there getting. May I kindly sugest you throw it in the garbage and get a bov that does it jobs of stopping surge venting unneeded compressed ait and protecting the turbo....itstead of one that makes a cool noise?

I never bought it for the sound, I thought all BOV's worked the same, boy have I learned haha. Is there any BOV that has the same flange as the HKS, or adapters?

 

[queenskid926]

I never bought it for the sound, I thought all BOV's worked the same, boy have I learned haha. Is there any BOV that has the same flange as the HKS, or adapters?

yes the synapse bov can be ordered with the hks flange so you can just take the hks out and put the synapse synchronic in.

 

[crisp]

I stick by my position that the issue is not likely in the HKS BOV, but rather in your plumbing or a damaged part.

I'll call BS on dissing the design and function of HKS BOV's as "for the sound"... that's ludicrous, and points to unwarranted bias, not fact. I'll not hesitate for a moment to suggest the HKS product to a newcomer, or veteran alike.

I'm sure there are MANY well designed, manufactured, and functioning brands and models out there. At some point, preference is the greater factor than the specs. alone.

I have yet to see someone LISTEN to the various BOV's "sound" in a side-by-side comparison and purchase on that basis alone. If they did, then sharing that here would be thread suicide.:biglaugh:


My number one suggestion on plumbing these boosted cars is to keep lines as short as possible, use the correct flow and "INTEGRITY" tubing (doesn't CONSTRICT or EXPAND for the vacuum/boost pressures exerted) and connected to the CORRECT SOURCE at a PRIMARY pressure point.

Also, if the plumbing isn't PROPERLY MAINTAINED in even it's stock elements, issues in pressure flow at a stock level are COMPOUNDED in a modified vehicle.

...lastly, one leak and all bets are off...


-crisp

 

[crisp]

One more consideration.

I've seen BOV flanges welded to the pipe with SMALLISH HOLE in IC pipe. After the "initial hole" is created, you can ENLARGE THE MOUTH in a "venturi" type "bell" flair by grinding on the INSIDE since the flange is welded around the outside perimeter. This will allow the pressure release to be COMPLETELY controlled by the valve, and NOT constricted by the diameter and flow characteristics of the hole in the IC pipe. If a "lip" exists on the ID at the IC pipe to BOV "port", I believe you can contribute to or cause the "release flutter" you describe. (resistance and turbulence of air)

Any "counter-thoughts" on this principle are welcome.



-crisp

 

[tbcmorris]

Crisp your advice on plumbing is great.

I have had a lot of bad expericances with the hks design and some other designs. I refuse to sell them to my customers. Most of the time when someone posts up on here that they are having compressor surge they are running a SSQV

 

[crisp]

Crisp your advice on plumbing is great.

I have had a lot of bad expericances with the hks design and some other designs. I refuse to sell them to my customers. Most of the time when someone posts up on here that they are having compressor surge they are running a SSQV

^^^ That's fair enough! Your experiences should certainly speak for your advice to others. I'm good with that. I would certainly weigh the power of "numbers" over "opinion" anyday... and my "opinion" is based on limited experience.


-crisp

 

[Poodles]

HKS also uses a smaller vacuum line than the stock BPV, which I think complicates things.

I run a knock off Racing Type II (it's no longer made by HKS and I wanted one), and it's the same body as the SSQV but only has one large valve instead of the two valves in the SSQV. Depending on the day I get minor surge if I'm not boosting over a certain PSI.

Then again, that was the entire design point of the SSQV to open at those lower levels with the smaller valve, but it requires a clean vacuum source...

 

[crisp]

Then again, that was the entire design point of the SSQV to open at those lower levels with the smaller valve, but it requires a clean vacuum source...

^^^ My points exactly! All makes sense... there is design intent that must be considered for application suitability as well as prerequisite for intent-specific function.



-crisp

 

[dumbo]

Personally, I've had the EARLY HKS SBOV and the NEWEST HKS BOV. BOTH have worked flawlessly for me, although the SINGLE action LARGE mouth original blew-off "more abruptly", the sequential is more responsive and quicker to relieve pressure.

I know I'm "biased" toward HKS components, but NOT necessarily "ALL" of their products against others... but I've had very good results with my BOV's from them so far, and NO flutter as you describe, unless I am "whistling" between vacuum and boost transition... but very little "flutter", always a good air dump.
I think your vacuum or plumbing in general on the valve is suspect.

Personally, I've been in VERY "fluttery/jerky" BOV behaviored cars, and both cases were either plumbing, or the spring too "tight" to allow proper relief on off-throttle.


G/L!


-crisp

So you do get flutter than, right? If I'm making anywhere over a pound or two, just a slight whistle. It's when I'm around 0-5inches/mercury when I get the most flutter, maybe 1/4-1/3 throttle. I have a dedicated vacum line tapped into the "90" off the front of intake manifold, maybe 3 feet long, that adapter/filter has been removed, and there is no direction changes at all. I'm not sure what else one could do to stop the flutter.

 

[crisp]

So you do get flutter than, right? If I'm making anywhere over a pound or two, just a slight whistle. It's when I'm around 0-5inches/mercury when I get the most flutter, maybe 1/4-1/3 throttle. I have a dedicated vacum line tapped into the "90" off the front of intake manifold, maybe 3 feet long, that adapter/filter has been removed, and there is no direction changes at all. I'm not sure what else one could do to stop the flutter.

Hmmm... no, still not "that" kind of flutter in my experience. The ONLY "flutter" I can discern is WHEN you dump, and at END of exhaustion of blow-off pressure, it briefly "fttt..fttt...phhttttt..." very briefly, IF I stay off throttle. ANY time I am MORE than "BETWEEN" vacuum/boost (RIGHT in the "neutral" position) do I "whistle"... and ANY boost positive and it's firm, no flutter.


Does that make sense?


-crisp