SR20DET Vacuum question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Cam B · 02-27-2007, 06:30 PM

First off, to specify which SR i am talking about, its the redtop. With that said, i would like to know the engine vacuum reading. I'm looking to get a TIAL BOV for my car and am wondering which spring pressure to get for the BOV. Here is the table provided on the site...
-10 to -13 in/HG use 7 PSI Spring
-14 to -17 in/HG use 9 PSI Spring
-18 to -21 in/HG use 11 PSI Spring
-22 to -23 in/HG use 12 PSI Spring
Here is a link too..
http://www.extremepsi.com/store/cust...cat=390&page=1
Also, any of you that may have previously or currently own this specific BOV, let me know how its been for you and any pros and cons you have come across. Thank you in advance!

*Bud Brown* · 02-27-2007, 06:32 PM

i'm wondering too

Jesses240 · 02-27-2007, 06:36 PM

My 98 black top SR runs about -.7 bar vacuum(what the gauge says I don't know why its in -bar to +bar but oh well, (-0.7 bar = 20.670 988)

I have the 11 pound spring in my tial bov.

No issues at all with it being un-recirculated.

Although i'm thinking about switching to the 7 or 9 pound spring because I get a lot of compressor surge before the tial actually opens... (not at WOT - off) but at slow backing off the throttle. and medium - off

Jesses240 · 02-27-2007, 06:43 PM

You can hear the tial bov on my car in these 2 video's I have...

http://s147.photobucket.com/albums/r...RSWAP029-2.flv
http://s147.photobucket.com/albums/r...meraPix077.flv

McRussellPants · 02-27-2007, 06:44 PM

Mine does -.60 at idle and -.80ish on decel.

thats 15 and 20 in of vac respectively.

*Bud Brown* · 02-27-2007, 07:12 PM

thanks for the replies guys!

Cam B · 02-27-2007, 08:01 PM

cool, thanks

adictd2b00st · 06-03-2008, 06:54 AM

bumping this....... i have a TIAL right now that i got used locally from one of the honda boys, and i'm thinking i need a different spring because i do get compressor surge when letting off at part throttle. looks like jesses240 was getting this same issue with the 11psi spring, would the 9psi spring be the one to use? fwiw my defi shows the vac @ 20 at idle

02-27-2007, 06:30 PM	#1
Cam B Zilvia Member Join Date: Jan 2006 Location: CT Posts: 186 Trader Rating: (0) Feedback Score: 0 reviews	SR20DET Vacuum question First off, to specify which SR i am talking about, its the redtop. With that said, i would like to know the engine vacuum reading. I'm looking to get a TIAL BOV for my car and am wondering which spring pressure to get for the BOV. Here is the table provided on the site... -10 to -13 in/HG use 7 PSI Spring -14 to -17 in/HG use 9 PSI Spring -18 to -21 in/HG use 11 PSI Spring -22 to -23 in/HG use 12 PSI Spring Here is a link too.. http://www.extremepsi.com/store/cust...cat=390&page=1 Also, any of you that may have previously or currently own this specific BOV, let me know how its been for you and any pros and cons you have come across. Thank you in advance! __________________ -1995 240sx (junk yard) -1997 Impreza STI Type R (FOR SALE)

02-27-2007, 06:32 PM	#2
Bud Brown Premium Member Join Date: Feb 2007 Location: Connecticut Posts: 194 Trader Rating: (0) Rides Gallery: Bud Brown Feedback Score: 0 reviews	i'm wondering too __________________ 315whp S13 Chuki :: Daily Driver 550whp S14 Zenki :: SOLD

02-27-2007, 06:36 PM	#3
Jesses240 Leaky Injector Join Date: Aug 2006 Location: Oregon Age: 40 Posts: 74 Trader Rating: (0) Feedback Score: 0 reviews	My 98 black top SR runs about -.7 bar vacuum(what the gauge says I don't know why its in -bar to +bar but oh well, (-0.7 bar = 20.670 988) I have the 11 pound spring in my tial bov. No issues at all with it being un-recirculated. Although i'm thinking about switching to the 7 or 9 pound spring because I get a lot of compressor surge before the tial actually opens... (not at WOT - off) but at slow backing off the throttle. and medium - off __________________ --Jesse R33

02-27-2007, 06:43 PM	#4
Jesses240 Leaky Injector Join Date: Aug 2006 Location: Oregon Age: 40 Posts: 74 Trader Rating: (0) Feedback Score: 0 reviews	You can hear the tial bov on my car in these 2 video's I have... http://s147.photobucket.com/albums/r...RSWAP029-2.flv http://s147.photobucket.com/albums/r...meraPix077.flv __________________ --Jesse R33

02-27-2007, 07:12 PM	#6
Bud Brown Premium Member Join Date: Feb 2007 Location: Connecticut Posts: 194 Trader Rating: (0) Rides Gallery: Bud Brown Feedback Score: 0 reviews	thanks for the replies guys! __________________ 315whp S13 Chuki :: Daily Driver 550whp S14 Zenki :: SOLD

02-27-2007, 06:44 PM	#5
McRussellPants Nissanaholic! Join Date: Oct 2005 Location: Austin, Tx Posts: 2,168 Trader Rating: (0) Feedback Score: 0 reviews	Mine does -.60 at idle and -.80ish on decel. thats 15 and 20 in of vac respectively.

02-27-2007, 08:01 PM	#7
Cam B Zilvia Member Join Date: Jan 2006 Location: CT Posts: 186 Trader Rating: (0) Feedback Score: 0 reviews	cool, thanks __________________ -1995 240sx (junk yard) -1997 Impreza STI Type R (FOR SALE)

06-03-2008, 06:54 AM	#8
adictd2b00st Zilvia Addict Join Date: May 2003 Location: OH Age: 43 Posts: 695 Trader Rating: (4) Feedback Score: 4 reviews	bumping this....... i have a TIAL right now that i got used locally from one of the honda boys, and i'm thinking i need a different spring because i do get compressor surge when letting off at part throttle. looks like jesses240 was getting this same issue with the 11psi spring, would the 9psi spring be the one to use? fwiw my defi shows the vac @ 20 at idle