HKS SSQV and placement question.... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

RSP13-Sideways · 05-21-2006, 09:30 PM

I bought some custom Blitz Piping for my GReddy intake manifold, well it came with a HKS SSQV on the "cold-pipe" side. Is it normal for an SR to run a BOV on the "cold-pipe" section? My turbo is getting compressor surge and I cannot figure it out, the BOV is not coming on and it's been adjusted tightly and loosely.

HyperTek · 05-21-2006, 09:34 PM

you got a vacum line coming from behind the throttle body hooked up to it right? Ive heard having the bov on the coldpipe has its benefits, but slightly. Air can be released right before the throttlebody, should have a little faster response that way, instead of the air being stuck in the plumbing.

nrg · 05-21-2006, 09:53 PM

um.. s13 sr20det has bov on the hot pipe section. s14/s15 sr20det has bov on cold pipe section.

it doesn't mater where you put it, on the pipes, intercooler, your forhead.

are you sure you're getting surge? maybe it just sounds like it? i used to think i was but it's just the way the dual valve on the hks works.

joewantstodrift · 05-21-2006, 11:42 PM

mine is on the hot side but i actually think it makes more sense to have it closer to the throttle body. so the charged air doesnt have to travel so far back through the piping.

RSP13-Sideways · 05-21-2006, 11:56 PM

I definitely have vacuum going to it, I have it directly under the GReddy intake manifold, I pulled the hose and theres good "suckage".

I know it's compressor surge because the HKS SSQV has a pretty distinct sound when blowing off, plus at idle...I'll rev and put my ear to the intake filter and the turbo is surging out of it...fluttering.

I cannot figure it out, perhaps a faulty one? The spring has tension, I pulled the SSQV and checked it over, it seems good.

*fliprayzin240sx* · 05-22-2006, 12:11 AM

I wouldnt recommend having it on the cold side. Think bout it. Pressure on the pipe has to build up for it to blow off. Pressure begins from the turbo when the throttle plate closes. In my head, the further the BOV is from the turbo, the longer time there will be compression surge on the turbo.

nrg · 05-22-2006, 12:21 AM

the hks ssqv makes it's sound at under boost. but like at idle and small revs, it will open up and make no sound. you can test it by reving it and putting your hand infront of the valve, air will blow out. Mine makes the fluttering sound, but it's not compression surge, it's the dual valve flapping under low boost. test it out yourself.

05-21-2006, 09:30 PM	#1
RSP13-Sideways Zilvia Addict Join Date: May 2003 Location: Northern California Age: 42 Posts: 850 Trader Rating: (0) Feedback Score: 0 reviews	HKS SSQV and placement question.... I bought some custom Blitz Piping for my GReddy intake manifold, well it came with a HKS SSQV on the "cold-pipe" side. Is it normal for an SR to run a BOV on the "cold-pipe" section? My turbo is getting compressor surge and I cannot figure it out, the BOV is not coming on and it's been adjusted tightly and loosely. __________________ - Jay WTB: Nothing at the moment. LEWL WTS: Everything sold, thanks folks!

05-21-2006, 09:34 PM	#2
HyperTek Post Whore! Join Date: Mar 2003 Location: Cali Posts: 13,224 Trader Rating: (3) Feedback Score: 3 reviews	you got a vacum line coming from behind the throttle body hooked up to it right? Ive heard having the bov on the coldpipe has its benefits, but slightly. Air can be released right before the throttlebody, should have a little faster response that way, instead of the air being stuck in the plumbing. __________________ Keep it Classy

05-21-2006, 09:53 PM	#3
nrg Zilvia FREAK! Join Date: Mar 2004 Location: CA Age: 40 Posts: 1,571 Trader Rating: (1) Feedback Score: 1 reviews	um.. s13 sr20det has bov on the hot pipe section. s14/s15 sr20det has bov on cold pipe section. it doesn't mater where you put it, on the pipes, intercooler, your forhead. are you sure you're getting surge? maybe it just sounds like it? i used to think i was but it's just the way the dual valve on the hks works. __________________ driftingisgay.com

05-21-2006, 11:56 PM	#5
RSP13-Sideways Zilvia Addict Join Date: May 2003 Location: Northern California Age: 42 Posts: 850 Trader Rating: (0) Feedback Score: 0 reviews	I definitely have vacuum going to it, I have it directly under the GReddy intake manifold, I pulled the hose and theres good "suckage". I know it's compressor surge because the HKS SSQV has a pretty distinct sound when blowing off, plus at idle...I'll rev and put my ear to the intake filter and the turbo is surging out of it...fluttering. I cannot figure it out, perhaps a faulty one? The spring has tension, I pulled the SSQV and checked it over, it seems good. __________________ - Jay WTB: Nothing at the moment. LEWL WTS: Everything sold, thanks folks!

05-22-2006, 12:11 AM	#6
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	I wouldnt recommend having it on the cold side. Think bout it. Pressure on the pipe has to build up for it to blow off. Pressure begins from the turbo when the throttle plate closes. In my head, the further the BOV is from the turbo, the longer time there will be compression surge on the turbo. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

05-21-2006, 11:42 PM	#4
joewantstodrift Zilvia Junkie Join Date: Jan 2004 Location: Champaign, IL Age: 38 Posts: 410 Trader Rating: (3) Feedback Score: 3 reviews	mine is on the hot side but i actually think it makes more sense to have it closer to the throttle body. so the charged air doesnt have to travel so far back through the piping.

05-22-2006, 12:21 AM	#7
nrg Zilvia FREAK! Join Date: Mar 2004 Location: CA Age: 40 Posts: 1,571 Trader Rating: (1) Feedback Score: 1 reviews	the hks ssqv makes it's sound at under boost. but like at idle and small revs, it will open up and make no sound. you can test it by reving it and putting your hand infront of the valve, air will blow out. Mine makes the fluttering sound, but it's not compression surge, it's the dual valve flapping under low boost. test it out yourself. __________________ driftingisgay.com