HKS SSQV compressor surge

[Supra!!!]

just put on my bov and started it right up. then i hear compressor surge and "damn it." stock twins by the way and the MAF. it is vented to the atmosphere. the line to the back of the bov is snug and i capped off where the stock one is. it seemed to get better in a few minutes. does the computer have to learn that it isn't recirculated? anything else? thanks

[cgusrh]

I installed my SSQV without ever getting Compressor surge vented to the atmosphere. These BOVs are good for low boosting supras because they don't need a lot of pressure to open. If you post some pictures maybe we can find something wrong. What boost are you running?

[Troux]

What boost was it surging at? I had surge problems earlier and it had to do with my sequential lines.

[Supra!!!]

i have a boost controller but since i just installed it i turned it back to normal. i'll take some pics though. where are the sequential lines?

[cgusrh]

Where did you get this kit. Ebay replica kits work but the internals aren't as smooth and can restrict air flow. If bought used it could be an older model that has an adjustable screw. Thts screw tightens the spring to make a higher pitched noise and open harder. Loosen the screw inorder to make a softer noise and open easier. Newer models don't have this because it caused to many problems

If none of these are your situation then the bov possibly needs to be lubed.

[Troux]

Well just check all your sequential lines.

[Supra!!!]

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[Supra!!!]

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what lines should i check? i'm what you call a noob.

[JDM_trdsupra_tt]

When do you hear it ?
i know that if I'm driving along and I ease myfoot off of the pedal I hear a fluttering sound. Once I'm driving normal I get the "pssst" (high pitched sound). I have become accustomed to gentally taking my foot off of hte pedal to make this sound...............I wonder if that is compressor surge

If that is the case then I've been compressor surging for hte past 8 or so months . But I does sound sweet . I'll try to get a sound clip for you

[ItsNOTaSoarer]

I didnt have my BOV hooked up on my GT40 with a ported housing for a day... The compressor surge can kill small children lol

[cgusrh]

From HKS

For maximum performance, the HKS SSQV incorporates both a small primary valve for ultra quick activation, along with a larger secondary valve for additional discharge capacity. The SSQV is engineered to initially open the small primary valve at light throttle and load conditions, then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions.

High boost high pitch. Low boost has a softer sound almost like fluttering. This is because of the different valves HKs uses.

From the looks of the pictures i can't tell you much. I would look at my car to see if everything is right but mine is setup different. All stock twins I've seen has them installed the way I do. I'll see if I can find a pick sorry I have none of my own.

Is your kit the universal one and not supra specific?

[Supra!!!]

it is universal. i haven't taken it out yet just messing with the throttle so the load is very low. the sound does get worse when the throttle is higher and it is coming from the turbo side. it pretty much sounds like this ->
http://videos.streetfire.net/search/...3f0150f005.htm

[Supra!!!]

is there any other vaccum lines i could try

[Goldfinger911]

Does yours have an adjusting screw? If so, try taking it almost all the way out, then securing the lock nut.... lowering the spring tension. Also, try using a different vaccum source. Right off the intake manifold for example.

With the BOV off, can you manually actuate the piston on the bench?

I used to run an HKS Racing Bypass valve when I had stock twins and it would flutter/surge with small amounts of boost, but then when I would run it up, and let off, it would purge nicely. Thats the down side of a BOV that is a single chamber. I know then say that it is a two chamber... but not in the sense that it is a dual driven piston. I use a Turbonetics Raptor and it blows off with as little as 3psi of boost, and yet still does not leak at 28psi of boost.

[Supra!!!]

what source of the intake mani? does it have more pressure. it will probably closer than what the stock one uses which i'm using. how can i manually actuate the piston. i don't have the stock one on and i don't want to buy knew hoses for the stock one since it didn't come off pretty ( hasn't moved in a decade+).

[Goldfinger911]

Any source. T-off the map sensor hose. That one is easy to get to. I was just thinking get that hard line out of the mix, just in case there is a restriction somewhere. (I haven't had the stock twins on my car in a few years, so I forget what hardline goes where.)

Manually actuate the piston with the plastic end of a screw driver. Just to check for smooth movement. If you cant move it somewhat easily, there is a binding issue of the spring is too tight.

If you pull that hose off the hardline with the car idling, do you cause a vaccum leak? You should hear the hissing/whistling of a vaccum leak when you pull it off.

Originally Posted by Supra!!!

what source of the intake mani? does it have more pressure. it will probably closer than what the stock one uses which i'm using. how can i manually actuate the piston. i don't have the stock one on and i don't want to buy knew hoses for the stock one since it didn't come off pretty ( hasn't moved in a decade+).

[grego2]

first thing you should do is take off the metal hose clamp that is securing the vacuum line to the valve to the ac lineshown in the second picture, use a loose zip tie. That will cause some damage later down the line.
Try hooking a vacuum guage up to the end were the ssqv is and blip the throttle to see if you are getting a good source of vacuum.
Do you know if the valve is venting pressure? Can you reach down there and feel any blow off?
Other than the clamp and that you are still running the sidemount intercooler, the hose hookup looks the same that was on my car.

[Supra!!!]

the bov is letting off pressure. i'm going to try and recirculate the air. that is probably the problem.