HKS ssqv bov problem

VR46 · 11-10-2010, 06:48 PM

I just bought a HKS ssqv bov from Vividracing and installed it about a week ago.

My problem is, it seems that under high boost 13 to 14psi and high rpm around 6000rpm shifting from 1st to 2nd and also shifting from 2nd to 3rd the blow off valve sounds like just a chirp, as if the main valve is not opening and just the smaller valve.
The BOV has no problem with low boost 1 to 9psi and low rpm 1500 to 5000rpm blowing off.

I did some datalogging with my Procede v4 and it looks like when you shift and get off the throttle where throttle reads 0 shouldn't boost also read 0, since the boost pressure was released. My logs show when i let off throttle to shift there is still 4.5lbs of boost is this normal.

I used to have a turbo Integra many years ago with the same HKS BOV and dont remember it doing this.

Sorry for the long read just want to get all the info out there for the best possible suggestion or answer.
Thanks everyone, David

BrianMN · 11-10-2010, 06:59 PM

the 'drive by wire' factor can play a part in a delay between your right foot and the throttle blade closing....FWIW, my BOV doesn't open at all during fast shifting.

thread killer · 11-10-2010, 07:06 PM

no idle valve, and it needs to create a "decay" while coming off of a higher RPM. normal IMO

e93WhiteonRed · 11-10-2010, 07:18 PM

Isn't that the bog fix... when you're in the top of the band and it holds boost in between shifts so long that you let your foot completely off of the gas?

thread killer · 11-10-2010, 07:21 PM

your confusing waste gate, blow off valve and throttle valve operation.

Ghines1279 · 11-10-2010, 08:46 PM

yeah i noticed something like that with mine. Im like 90%sure its just valve open all the way. As long as the air has a place other than back into the turbo its all good.

VR46 · 11-10-2010, 10:52 PM

Thanks guys,
I was thinking that it had something to do with the 'drive by wire' and the plates not closing fast enough but wasn't for sure.

11-10-2010, 06:48 PM	#1
VR46 Private 4 Rep 88 Posts Drives: First VTT stage 3 725whp Join Date: Oct 2010 Location: san francisco iTrader: (0)	HKS ssqv bov problem I just bought a HKS ssqv bov from Vividracing and installed it about a week ago. My problem is, it seems that under high boost 13 to 14psi and high rpm around 6000rpm shifting from 1st to 2nd and also shifting from 2nd to 3rd the blow off valve sounds like just a chirp, as if the main valve is not opening and just the smaller valve. The BOV has no problem with low boost 1 to 9psi and low rpm 1500 to 5000rpm blowing off. I did some datalogging with my Procede v4 and it looks like when you shift and get off the throttle where throttle reads 0 shouldn't boost also read 0, since the boost pressure was released. My logs show when i let off throttle to shift there is still 4.5lbs of boost is this normal. I used to have a turbo Integra many years ago with the same HKS BOV and dont remember it doing this. Sorry for the long read just want to get all the info out there for the best possible suggestion or answer. Thanks everyone, David
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11-10-2010, 06:59 PM	#2
BrianMN Banned 117 Rep 2,428 Posts Drives: 4 Door Family Sedan Join Date: Sep 2009 Location: Minneapolis iTrader: (7)	the 'drive by wire' factor can play a part in a delay between your right foot and the throttle blade closing....FWIW, my BOV doesn't open at all during fast shifting.
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11-10-2010, 07:06 PM	#3
thread killer Banned 14 Rep 472 Posts Drives: faster then your car Join Date: Nov 2008 Location: pulling away iTrader: (3)	no idle valve, and it needs to create a "decay" while coming off of a higher RPM. normal IMO
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11-10-2010, 07:18 PM	#4
e93WhiteonRed Second Lieutenant 19 Rep 267 Posts Drives: 2007 E93 Alpine white with Red Join Date: Jul 2010 Location: Reston, Virginia iTrader: (3) Garage List 2007 335I E93 [0.00]	Isn't that the bog fix... when you're in the top of the band and it holds boost in between shifts so long that you let your foot completely off of the gas? __________________ 2007 335I E93 sport package Alpine White. BMS DCI, PROcede V4, ACT street clutch, Michelin Pilot Sport A/S Plus and BT Tool. Pending install of Raceland Downpipes.
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11-10-2010, 07:21 PM	#5
thread killer Banned 14 Rep 472 Posts Drives: faster then your car Join Date: Nov 2008 Location: pulling away iTrader: (3)	your confusing waste gate, blow off valve and throttle valve operation.
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11-10-2010, 08:46 PM	#6
Ghines1279 Second Lieutenant 7 Rep 238 Posts Drives: F30 335i Join Date: Mar 2009 Location: SAN DIEGO! iTrader: (5) Garage List 2007 e92 335i [0.00]	yeah i noticed something like that with mine. Im like 90%sure its just valve open all the way. As long as the air has a place other than back into the turbo its all good.
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11-10-2010, 10:52 PM	#7
VR46 Private 4 Rep 88 Posts Drives: First VTT stage 3 725whp Join Date: Oct 2010 Location: san francisco iTrader: (0)	Thanks guys, I was thinking that it had something to do with the 'drive by wire' and the plates not closing fast enough but wasn't for sure.
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