Installed hks bov,my boost went up! Why? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

SOUTHSTAR · 07-05-2005, 11:18 PM

I run stock boost on a stock sr. on my guage it usually looks like 6 lbs from my angle. I installed an hks sbov and went for a test drive. I found that when i flor it it spikes 10lbs and settles at 8lbs.

Why is this happening?

What can i do to correct this to be back to stock boost?

BoostInnovations · 07-06-2005, 12:31 AM

whats wrong with 8psi? its boost creep for the spike and id bet it was leaking out of your old BOV thats why it only ran 6psi...it should be higher than that

DrtyRat · 07-06-2005, 09:27 AM

yeah i had the same issue w/my stock bov on my s14 sr and when i replaced it w/the hks boost would climb to 10 and settle @ 8.

uno · 07-06-2005, 09:28 AM

yeah you're old bov was probably leaking.

SOUTHSTAR · 07-06-2005, 05:55 PM

I still have the stock blow off valve that is mounted on my stock sidemount.
I was running them both i just added the hks unit on that top pipe coming off the turbo. I always see the clips that come from japan with bov setup like this.

It works very well because the hks bov is not recirculated but the stock one still is. So you can hear the blow of valve but no hesitation between shifts and no stumbling idle. It shifts so much faster with the hks bov added.

So is it safe to run it the way it is now With it spiking 10 and settling at 8 on a stock engine setup.??? Will these boost levels cause any problem for the motor?

The only mod i have really is an intake filter and a walbro 255 lph pump.

BoostInnovations · 07-06-2005, 06:07 PM

doesnt the boost solenoid on silvias etc let it run at 11psi? you should be safe especially if you have a fuel pump

SOUTHSTAR · 07-06-2005, 10:24 PM

No the solenoid does not raise the boost because i have it installed on mine and it does nothing. I reall dont know what its for

So is spiking 10psi and settling 8psi safe on a stock motor with intake fliter and walbro pump?

DrtyRat · 07-07-2005, 06:24 AM

from my previous research(read:search) the sr20 can handle 10-12lbs of boost in stock form. You may need a catback and the smic if you don't have one. I ran my sr for 3-3.5 months w/this 'problem' and never had an issue. Just search (take if from a newb) and you'll usually find your answer.

BoostInnovations · 07-07-2005, 01:39 PM

why wouldnt he run an IC? i wouldnt run a gasoline turbo car non-intercooled..if it was like that from the factory hell if id keep it that way...he really doesnt need exhaust its not gonna keep the car from blowing up but thats prolly why hes boost creeping cause it cant bleed it off fast enough with the stock exhaust

07-05-2005, 11:18 PM	#1
SOUTHSTAR Join Date: Jan 2005 Location: SO_FLA Posts: 23 Trader Rating: (0) Feedback Score: 0 reviews	Installed hks bov,my boost went up! Why? I run stock boost on a stock sr. on my guage it usually looks like 6 lbs from my angle. I installed an hks sbov and went for a test drive. I found that when i flor it it spikes 10lbs and settles at 8lbs. Why is this happening? What can i do to correct this to be back to stock boost?

07-06-2005, 09:28 AM	#4
uno Zilvia Member Join Date: Mar 2003 Location: Castlewood VA Age: 43 Posts: 174 Trader Rating: (0) Feedback Score: 0 reviews	yeah you're old bov was probably leaking. __________________ CA18DET t25, 440CC injectors, Greddy FMIC, Greddy Hot Pipe, Greddy Type RS Bov ,Greddy Turbo Outlet, Trust DP, Motoria 3" Catback , XS Tubular Manifold, Nismo AFPR ,Nismo Engine and Transmission Mounts ,Apex'i SAFC 2 Walbro 255lph, LSD, SPL Subframe Collars, Tein S Tech Springs, Tein Tie Rods, Upper Front and Rear Strut Tower Braces. Black 180sx wheels.

07-06-2005, 12:31 AM	#2
BoostInnovations Zilvia Junkie Join Date: Jun 2005 Location: Moorhead, MN Age: 39 Posts: 322 Trader Rating: (0) Feedback Score: 0 reviews	whats wrong with 8psi? its boost creep for the spike and id bet it was leaking out of your old BOV thats why it only ran 6psi...it should be higher than that

07-06-2005, 09:27 AM	#3
DrtyRat Nissanaholic! Join Date: Jan 2005 Location: Miami,Fl Posts: 1,747 Trader Rating: (9) Feedback Score: 9 reviews	yeah i had the same issue w/my stock bov on my s14 sr and when i replaced it w/the hks boost would climb to 10 and settle @ 8.

07-06-2005, 05:55 PM	#5
SOUTHSTAR Join Date: Jan 2005 Location: SO_FLA Posts: 23 Trader Rating: (0) Feedback Score: 0 reviews	I still have the stock blow off valve that is mounted on my stock sidemount. I was running them both i just added the hks unit on that top pipe coming off the turbo. I always see the clips that come from japan with bov setup like this. It works very well because the hks bov is not recirculated but the stock one still is. So you can hear the blow of valve but no hesitation between shifts and no stumbling idle. It shifts so much faster with the hks bov added. So is it safe to run it the way it is now With it spiking 10 and settling at 8 on a stock engine setup.??? Will these boost levels cause any problem for the motor? The only mod i have really is an intake filter and a walbro 255 lph pump.

07-06-2005, 06:07 PM	#6
BoostInnovations Zilvia Junkie Join Date: Jun 2005 Location: Moorhead, MN Age: 39 Posts: 322 Trader Rating: (0) Feedback Score: 0 reviews	doesnt the boost solenoid on silvias etc let it run at 11psi? you should be safe especially if you have a fuel pump

07-06-2005, 10:24 PM	#7
SOUTHSTAR Join Date: Jan 2005 Location: SO_FLA Posts: 23 Trader Rating: (0) Feedback Score: 0 reviews	No the solenoid does not raise the boost because i have it installed on mine and it does nothing. I reall dont know what its for So is spiking 10psi and settling 8psi safe on a stock motor with intake fliter and walbro pump?

07-07-2005, 06:24 AM	#8
DrtyRat Nissanaholic! Join Date: Jan 2005 Location: Miami,Fl Posts: 1,747 Trader Rating: (9) Feedback Score: 9 reviews	from my previous research(read:search) the sr20 can handle 10-12lbs of boost in stock form. You may need a catback and the smic if you don't have one. I ran my sr for 3-3.5 months w/this 'problem' and never had an issue. Just search (take if from a newb) and you'll usually find your answer.

07-07-2005, 01:39 PM	#9
BoostInnovations Zilvia Junkie Join Date: Jun 2005 Location: Moorhead, MN Age: 39 Posts: 322 Trader Rating: (0) Feedback Score: 0 reviews	why wouldnt he run an IC? i wouldnt run a gasoline turbo car non-intercooled..if it was like that from the factory hell if id keep it that way...he really doesnt need exhaust its not gonna keep the car from blowing up but thats prolly why hes boost creeping cause it cant bleed it off fast enough with the stock exhaust