HKS SSQV and still a little compressor surge?

[Beems240sx]

i just installed the new stylr HKS bov about 10 minutes ago. my set up is a stock S13 SR20 with the stock sidemount intercooler. i have the vacuum line hooked into the bigger nipple on the throttle body, which im positive is for the bov.

i had the stock dumpvalve recirculated before this. So now when i get on it and shift, or let off the gas, i hear a split second of compressor surge then the PPPTTSSSHHHH from the hks. if i barely build any boost it seems as tho the hks doesnt want to open all the way and the compressor surge is louder.

i thought the vacuum line was too long and the lag time was causing this so i shortened it and much as i could. then i put the black saucer (vacuum restrictor???) that came with the HKS in between the vacuum line and im still having the slight surge. now im worried because i still have a journal bearing turbo and dont want to ruin it like my friend did to his starion turbo because the compressor surge sounded cool.

any insight on this matter? thanks

[wackawacka]

I have a sr with a front mount. Mine sounds like that. Under low boost it makes that fluttering sound. I think this subject has been debated many times before. Some say its compressure surge, some say its the sound of the BOV. I personally believe it is just the way the HKS sounds because of its a dual stage BOV. I have the stock turbo, and it hasnt been blown yet.... just my $.02

[Beems240sx]

well see i thought of that. so i covered the hks with my hand and turned the throttle body with the other and it let a tad bit of air out, but not enough to stop the surging. i can clearly hear it in the air filter and hot pipe area. im going to make sure the throttle body nipple is free of debris tomorrow to make sure thats not a problem. very true tho, even if it blows its not terribly expensive. or that just means GT2871r

[wackawacka]

What kind of boost was it pushing when you reved it and put your hand over the BOV?

Also i'm not %100 sure of the properties, but I think its pretty hard to boost unless its under some load. So possibly if you were just revving it, the boost could have been very low and thats why only tiny bit of air came out?

My SSQV actually blew out on the highway the other day. Turns out the snap ring popped out. I went to go look for the blown coupler, and my F-in HKS was laying next to the filter.

I had never seen that before and that snap ring was super solid in there.

[S14toRPS13]

I have a blitz bov where I can adjust the spring. Don't know if the HKS has the same feature. I eventually settled for a little bit of surge rather than stalling because mine's not recirculated.

[Beems240sx]

the hks is a pull type so its completely closed under boost and opens when it see's vacuum. so there is no adjusting of it. im not sure what kind of boost it was pushing because i was under the hood. but i guess i can live with a little surge. it sounds cool i guess but still sucks to have.

that snap ring was a PITA to put in. i hate those damn things. i need to buy a set snap ring pliers, instead of fighting and cursing trying to use needle nose and a flat tip screw driver...

[wackawacka]

that snap ring was a PITA to put in. i hate those damn things. i need to buy a set snap ring pliers, instead of fighting and cursing trying to use needle nose and a flat tip screw driver...

Sh1t yeah. Try it on the side of the highway with a 2" stubby style flat head. Scary.

I though you could adjust the newer style SSQV?

[Beems240sx]

nope, cant adjust it. you shouldnt have to. which is why im thinking there might be something blocking the vacuum from the throttle body like dirt or something

[wackawacka]

From HKS's web site

Many competitors use a push-type blow-off valve design with a large valve to accommodate high boost / high horsepower applications. These large valves react slowly and require high pressure to open, and are not able to activate and prevent compressor surge at light-load conditions. On the other hand, smaller, fast reacting push-type valves do not discharge the airflow capacity required for high horsepower applications and tend to slowly open and leak as boost pressure overpowers the spring. For maximum performance, the HKS SSQV incorporates both a small primary valve for ultra quick activation, and 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 (Diagram 2), then sequentially opens the secondary valve for additional relief capacity under high boost and load conditions

[Beems240sx]

ahhhh i get it now! thanks for that info

[hazer396]

isnt urs a S14 SR?it has the notch at the back..

[Beems240sx]

no i have a s13 sr with an s14 sr computer