How an HKS ssqv v.3 functions

[chetacheese]

Ive searched and I cant seem to find an exactly answer or logic. Please guide me in the right direction for info or post it here!

I have an ssqv v.3 and its on my ka24de-t setup. At first I had a knockoff v.1 bov and after a boost leak test, it was leaking all over the bov. Put on the real HKS and now it bogs and has an inconsistant idle.

first thing is, at idle, is the valve supposed to partially open? from my logics, the vaccum line is pulling on the diaphram allowing the bov to open slightly.

then when the throttle is open, where is it supposed to be. mine apparently is closing slightly but not all the way. and around 3-5k rpm the blow off valve is releasing air. and im sure thats now what is supposed to happen.

and last im sure its supposed to just release air then close after the throttle is closed.


things to know about my setup.
the maf is about 8 inches from the turbo.
its not recirculated. its currently atm.

can someone please throw something helpful in here!

[KaminaSan]

How is your BOV hooked up?

What vacuum lines where?

[chetacheese]

i tapped the fpr vacuum line. bov is on the hotpipe

[1slowS13]

i dont think it should be opening while on the throttle

if you think about it, that is unmetered air entering the intake

[chetacheese]

thats what i was thinking.....but from the ka-t.org website, a rep from jgs turbo said it was supposed to be. and being from jgs, i thought it would be a reputable source of info.

[SoSideways]

i tapped the fpr vacuum line. bov is on the hotpipe

There's your problem.

BOVs need their own dedicated vacuum line.

Use the bigger nipple on the top right of the throttle body.

[datsunnazi]

HKS USA SSQV Blowoff Valve (Super Sequential Blowoff Valve) (more) (http://www.hksusa.com/products/more.asp?id=792)

[chetacheese]

thanks for that link datsunnazi! that helped me understand the concept!

sosideways......the vacuum line on the top right of the tb is like a 1/2 in tube. is there another small vacuum line the size of the bov nipple there? i dont recall seeing one.

what does everyone else use as their vacuum source for the bov?

[KaminaSan]

BOVs do NOT NEED their own dedicated vacuum line. While they have the potential to be more responsive, they will work on another line.

HOWEVER. DO NOT! DO NOT! ALL CAPITALS DO NOT run your BoV off your FPR line.

That is probably the single most important line to leave untapped. Let's say you get a boost leak in your BOV, or something goes wrong at the T under full boost.

FPR reads the wrong boost/vacuum and BOOM there goes your motor leaning out, and blowing up.

I personally run my Boost Gauge/BOV off the top right nipple, FPR off top left nipple, and wastegate on the nipple under the TB. The nipple under the TB doesn't read vacuum, but does read boost afaik, which is what the wastegate needs.

If I made any mistakes, someone please correct me.

[Ceepo]

^run my setup the same, wastegate isnt gonna do anything under vac. so i hooked it to the bottom nipple also(boost only source)...

[cardoza]

I run my boost gauge off of my FPR... is my car going to asplode?

[KaminaSan]

^run my setup the same, wastegate isnt gonna do anything under vac. so i hooked it to the bottom nipple also(boost only source)...

Glad I wasn't talking out of my ass :rofl:!

Either way though, I get good response on my cheapy knockoff BoV running off the top right, with the Gauge. I get a small amount of turbo flutter if I let off the throttle like halfway(Like accelerating on the highway at 5-6 psi, then letting off over the course of a second, rather than letting my foot off the gas completely).

Beside that, this crappy ebay bov goes PSHHH and I hear no compressor surge, or anything.


I run my boost gauge off of my FPR... is my car going to asplode?
I have heard the FPR is the best place to run the boost gauge, but as for me... I'd rather be a little less accurate(1/2 psi at most?), and have the peace of mind, knowing that if my boost gauge malfunctions, or something, my car won't blow to pieces.

[SoSideways]

I get a small amount of turbo flutter if I let off the throttle like halfway(Like accelerating on the highway at 5-6 psi, then letting off over the course of a second, rather than letting my foot off the gas completely).

That's compressor surge.

[cardoza]

I have heard the FPR is the best place to run the boost gauge, but as for me... I'd rather be a little less accurate(1/2 psi at most?), and have the peace of mind, knowing that if my boost gauge malfunctions, or something, my car won't blow to pieces.

Seeing as I unknowingly drove my car for about five miles with my FPR vacuum line completely unattached (OMG what's that bogging?) And I just reattached it and it's running fine now I'm not too concerned.

[KaminaSan]

That's compressor surge.

Well, that's what I get for having a cheap BoV. I better go loosen that spring up from full tight.

[chetacheese]

Thanks kaminasan. That sounds logical, so ill untap my fpr line. As far as the nipples around the throttle body, i dont recall any above the tb, only below.

I removed my emissions so all the nipples below the tb except for the largest tube(diameter). That has vacuum and thats where I originally connected my bov. My vacuum is reading at about -22(gauge was tapped into the fpr line)
ps. no I didn't tap both the gauge and the bov to the fpr line... I switched them out so that there is no more than one tap in that line.

Is there another line that someone would recommend or suggest I use as my bov source?

[chaotix]

Kamina or Ceepo can you guys post a picture of the set up if thats not too much trouble

[SoSideways]

There are only 3 "vacuum" nipples around the SR's throttle body.

2 above, and 1 below. The 1 below, like everyone else said, is actually on the TB itself, and the source is actually just a tad in front of the throttle plate, thus it doesn't actually read any vacuum, but when you boost, it will see boost, thus perfect to use for the wastegate.

As for the nipples above the TB, they're actually on the intake manifold itself, and the one on the left is slightly smaller diameter, while the one on the right is a slight bit larger in diameter.

Everyone, well, most everyone, uses the top left one for FPR and tee it for the boost gauge, while the right one goes to the BOV.

[chetacheese]

"I have an ssqv v.3 and its on my ka24de-t setup"

Sorry bro, I actually have a ka-t. Which is the same concept, but the vacuum lines and ports aren't exact. I really appreciate your help though.

[s14unimog]

just run a boost/vacuum source off the intake manifold, and tap the turbo for a boost source. I don't like running unnecessarily long air lines...

that 1/2" line you were talking about is for the IACV