Subject	A BOV works on a pressure differential, not just manifold
Posted by	Ash's Z on February 16, 2006 at 12:44 PM
	This message has been viewed 116 times.
In Reply To	Related question on BOV/Recirc engagement... posted by mousersix (San Antonio) on February 16, 2006 at 12:39 PM
Message	vacuum. If it operated solely on manifold vacuum, it would have to stay open in an idle vacuum state, which wouldn't work since our cars use a mass-airflow metering system. The manifold is ideally under the same vacuum/pressure in any region - it doesn't really matter if you hook up the BOVs to the OEM location, or drill your own holes and fit hosebarbs in any other location - it will still get the same manifold vacuum/pressure regardless of position. What causes the BOV to open is the combination of the manifold vacuum AND the pressurized air in the piping that pushes the valve open. This is why at idle, the BOV will actually be sealed up. It takes a little bit of positive pressure to "push" the valve open. [ ashspecz.com ] [ agpowers@bellsouth.net ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast? If you are out to describe the truth, leave elegance to the tailor. Albert Einstein
Follow Ups	Blow off Valve Position Debate - Atl300zxTT 10:50:40 02/16/06 Old school HKS and Blitz had them on the outer pipes (n/m) - sfpearl300zTT 10:56:43 02/16/06 The primary job of BOV's is to release the pressurized air - Guapo 10:57:59 02/16/06 That's how I understood it and tried to explain it also. - Scotts94z32 11:08:50 02/16/06 More room on the outer pipes, easier to fit. Especially if - speedr300z (ATL) 11:15:47 02/16/06 tell me if what i am saying is correct.... - Atl300zxTT 11:51:39 02/16/06 that is the way I understand it, but I have not done the - Guapo 12:06:00 02/16/06 Re: tell me if what i am saying is correct.... - Kenny 12:08:14 02/16/06 thanks for the answers...this actually clears up a lot of my - Atl300zxTT 12:17:16 02/16/06 good explanation. Hopefully this post comes up in - Waco300zx 12:45:03 02/16/06 but reversion would imply a "flow" - Spee 13:00:01 02/16/06 Re: but reversion would imply a "flow" - Kenny 13:12:23 02/16/06 Can't argue with the bold argument :-) (n/m) - Joe(NoVA) 13:28:34 02/16/06 That makes sense except for one part. - 300zx90 (CO) 12:27:19 02/16/06 Re: That makes sense except for one part. - Kenny 12:44:58 02/16/06 Now we're getting close - 300zx90 (CO) 14:00:56 02/16/06 Closer to throttle = better. End of Story. (n/m) - Kenny 11:00:11 02/16/06 this means nothing without justification (n/m) - Atl300zxTT 11:26:38 02/16/06 Think about it. Also see Guapo's reply. (n/m) - Woody75 (Denver) 11:31:49 02/16/06 Have you tried searching? - Kenny 11:32:33 02/16/06 Search? This website has a Search Function? - Atl300zxTT 11:45:34 02/16/06 Yes, try using it. - Kenny 11:52:18 02/16/06 Re: Yes, try using it. - Atl300zxTT 12:14:07 02/16/06 actually, this was first discussed back in 2000 summer - CHUNG (Dallas) 21:20:24 02/16/06 Closer to the TB = better. This is the only reason I - whitepearlz 11:09:40 02/16/06 On this same note... - whitepearlz 11:22:39 02/16/06 you could probably fab a balance line in their place (n/m) - Guapo 11:29:21 02/16/06 the holes are pretty big from the flanges... - Atl300zxTT 12:02:36 02/16/06 Those look familiar... What you'd have to do is get a flat - whitepearlz 12:07:56 02/16/06 big balance tube :) (n/m) - Guapo 12:09:59 02/16/06 bigger is better :) (n/m) - Atl300zxTT 12:15:17 02/16/06 I put mine before the intercooler, about 2' from the turbo. - Ash's Z 11:57:19 02/16/06 interesting (n/m) - red300zxtt 12:03:55 02/16/06 got pics? - aliaZ 12:06:42 02/16/06 thats like asking a butcher if he's got a steak.. - Spee 12:10:37 02/16/06 Or, like asking if Spee has personality. - Ash's Z 12:18:06 02/16/06 Re: got pics? - Ash's Z 12:16:54 02/16/06 FWIW, if you ask "well, why did nissan put it before the - Ash's Z 12:15:58 02/16/06 *....didn't put it before...* (n/m) - Ash's Z 12:19:21 02/16/06 "a logistical nightmare to implement that way" - Kenny 12:23:15 02/16/06 Right? :) (n/m) - Ash's Z 12:30:05 02/16/06 Re: I put mine before the intercooler, about 2' from the tur - Kenny 12:20:44 02/16/06 FWIW, on Dee's car when we were datalogging the temps - Ash's Z 12:29:30 02/16/06 Wow. - Kenny 12:34:15 02/16/06 see this post was worth something :) (n/m) - Atl300zxTT 12:38:14 02/16/06 yes, this is post of the day (n/m) - mousersix (San Antonio) 12:40:18 02/16/06 I know =). - Kenny 12:46:43 02/16/06 Let me check your post history....ummmm.....not a chance in - Atl300zxTT 12:49:46 02/16/06 Yes you can vent from anywhere in the system, however as you - 300zx90 (CO) 12:32:14 02/16/06 Related question on BOV/Recirc engagement... - mousersix (San Antonio) 12:39:48 02/16/06 As seen here... - mousersix (San Antonio) 12:43:34 02/16/06 That was just a convenient location to hook mine up - Ash's Z 12:48:05 02/16/06 thanks for the info (n/m) - mousersix (San Antonio) 13:13:22 02/16/06 question? how are the intake and IC tubing so slow in that - SpecNATT (Houston) 19:25:18 02/16/06 A BOV works on a pressure differential, not just manifold - Ash's Z 12:44:30 02/16/06 I'm having a hard time believing there will be no effects - mousersix (San Antonio) 13:12:00 02/16/06 I would have a hard time believing it too. :) - Ash's Z 13:22:38 02/16/06 thanks Ash - mousersix (San Antonio) 13:46:33 02/16/06 Mine is after the IC, close to the TB - F8IZHIS 12:59:58 02/16/06 Bee-Emm-Dub!! What? Yeaaaaah!! OK!!! (n/m) - Waco300zx 13:01:50 02/16/06 BEEIMDABOWLYOU and VEEDABOWLYOU TOO! (n/m) - Ash's Z 18:28:59 02/16/06 Know what the difference between a porcupine and a BMW is? - Ash's Z 13:24:32 02/16/06 Ouch... - F8IZHIS 13:43:46 02/16/06 XP SP2 - Ash's Z 13:51:47 02/16/06 No offense taken - F8IZHIS 14:17:39 02/16/06 I use the standby function with XP. WHen I turn the car - Ash's Z 14:45:46 02/16/06 Absolute classic Ash. BTW where did you get the - Riddick 14:40:42 02/16/06 www.summitracing.com. It is all 6AN braided hose and - Ash's Z 14:43:35 02/16/06 Thanks Ash. Nice work..... (n/m) - Riddick 17:43:43 02/16/06 you've never heard that one before? - Spee 14:50:51 02/16/06 For a guy who really hasn't done "Dick" to his Z - Riddick 17:43:01 02/16/06 lol, nice try n00b. - Kenny 17:51:41 02/16/06 thigh* (n/m) - ZXRider(SoCal) 19:42:28 02/16/06 He might be a good mechanic but he is an ass and - Riddick 08:03:20 02/17/06 too* - Atl300zxTT 09:38:19 02/17/06 Thanks for the grammatical lesson jag-off. - Riddick 10:29:01 02/17/06 Noob = new to this site (n/m) - Atl300zxTT 11:37:43 02/17/06 Joined March 4th 2004. Been reading on this site - Riddick 12:09:36 02/17/06 LOL. WTF are you talking about? - Spee 23:16:44 02/16/06 First off I am not a dumb fuck Noob little guy. - Riddick 08:01:29 02/17/06 BOV's are bad for most VG30DETT. (n/m) - Spongerider :) 13:23:57 02/16/06 bad? - Max865(ATL) 16:24:48 02/16/06 Bad from a performance point. (n/m) - Spongerider :) 18:30:13 02/16/06 Dean, would you mind explaining a little more? - Ash's Z 18:44:19 02/16/06 Sure and I know you know too. - Spongerider :) 20:13:05 02/16/06 Well, there isn't anything additional that needs to be done - Ash's Z 21:45:23 02/16/06 Well as usual we don't see eye to eye when it comes to - Spongerider :) 22:52:16 02/16/06 Well, there's nothing wrong with that. - Ash's Z 13:22:37 02/17/06 I use my Greddy E-manage to compensate for the - Riddick 10:47:01 02/17/06 Re: I use my Greddy E-manage to compensate for the - Spongerider :) 10:59:30 02/17/06 Thank you. I thought that's what you meant. - Riddick 12:11:22 02/17/06
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