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Well...

Posted by: Joshua (wishbone) on 2002-09-24 12:38:34
Account #: 12268

In Reply to: Right - but figure that if it goes back through the MAF, and say you're off throttle for a couple posted by zapco98 on 2002-09-24 11:13:39

A couple of things if I understand what you're saying. When it dumps back into the system it's not getting metered again. It's all behind the MAF at this point. Also because the BPVs are open (vacuum in manifold) it just continue to circulate until the throttle plate opens again. If for some strange reason the air did flow back out the intake (maybe the BPVs are malfunctioning?) the MAF is capable of reading return air flow. What it does with these reading I do not fully understand, but it is capable of it.

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2004 4.2 Allroad
2000 2.7t S4
The Arizona Audi Car Club
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Thread:

BOV's...a little tip - DonIstook 2002-09-23 20:07:41 (19101 views)

Re: BOV's...a little tip - pythaguras 2003-10-02 23:02:40 (276 views)

does anyone know if the .... - just_a_kid 2002-11-19 22:14:19 (1536 views)

NEWBIE to Audis...been a Honda/Acura guy since high school...NEED HELP! NEED GUIDANCE! - t4t3hybrid 2002-11-01 14:24:47 (2169 views)

Just Bought One, I will have a writeup this upcoming friday (Oct 4th) - STKSKI 2002-09-29 20:20:31 (1450 views)

Don - some comments for your consideration - LONG - shortyq 2002-09-24 23:09:39 (1682 views)

Very interesting, as are your cars : ) - what's that smell?st 2002-09-25 10:08:32 (960 views)

Interesting info - thanks Scott. BTW I've been practicing my left foot braking. =) - markbradford 2002-09-25 07:16:49 (997 views)

Okay let's review: How much sheer abuse did BOV folks endure here before this? - sans-audi 2002-09-24 16:11:49 (1232 views)

A ton. Why? Because they were FULL OF CRAP. - nyet 2002-09-24 16:13:37 (1369 views)

Some people admitted it, in their defense : ) - what's that smell?st 2002-09-24 17:05:17 (795 views)

Well, yeah. - sans-audi 2002-09-24 16:18:08 (706 views)

Don what about "engine wash" - WJM 2002-09-24 14:52:35 (1371 views)

All cars are subject to the same emission standards, both high and low rpms - DonIstook 2002-09-24 19:30:47 (1051 views)

very true A/F ratios are what they are... - WJM 2002-09-25 12:28:38 (834 views)

Thanks Don! I still have a question about the design with a MAF though. - Joshua (wishbone) 2002-09-24 10:54:23 (985 views)

I think he is saying it only runs overly rich during idle (if the valve is misadusted and open) - nyet 2002-09-24 11:12:15 (935 views)

Naw, the car runs rich in essense because say for example you take your Forge valve - zapco98 2002-09-24 11:23:15 (1309 views)

ah got it. - nyet 2002-09-24 11:24:22 (652 views)

Yeah I got what he was saying with idle and non-boost applications.. - Joshua (wishbone) 2002-09-24 11:15:51 (809 views)

Don, can you confirm that these are the right ones? - DABearS4 2002-09-24 10:28:27 (1040 views)

Thanks for the info! Now my S4 will be perfect! - DABearS4 2002-09-24 10:25:35 (867 views)

bless you for these informative posts... - SameerP 2002-09-24 09:45:59 (1022 views)

what about metered air dumped between shifts? - BOOSTD 2002-09-24 09:39:49 (779 views)

I was wondering that too. Must run rich during shifts no? DOn, would you recommend this for...... - markbradford 2002-09-24 13:06:48 (877 views)

Well - I was thinking about this the other night - I don't think the ECU really knows what is coming - zapco98 2002-09-24 10:43:09 (849 views)

the mix getting to the O2 sensors is probably how it knows... - TRM @ velozt.com 2002-09-24 11:09:27 (841 views)

Does it matter how much is coming back?? - Joshua (wishbone) 2002-09-24 11:07:16 (739 views)

Right - but figure that if it goes back through the MAF, and say you're off throttle for a couple - zapco98 2002-09-24 11:13:39 (842 views)

Well... - Joshua (wishbone) 2002-09-24 12:38:34 (614 views)

[edit] but now the extra pressure in the INTAKE system will prevent MORE air from passing the MAF - nyet 2002-09-24 11:17:51 (725 views)

*and the whole S4 group moves to BOV's* ;) great info Don! - Audiboy 2002-09-24 08:51:28 (969 views)

;-) - TRM @ velozt.com 2002-09-24 08:59:59 (617 views)

Would this valve also work in the TT? Is all the information accurate also for the 1.8t? - Power5 2002-09-24 05:37:21 (837 views)

track this thread FOREVER! good stuff Don - thanks for sharing. - TRM @ velozt.com 2002-09-24 04:58:09 (576 views)

so can you tell us exactly how to setup the valve to keep it closed at idle? (amount of washers etc) - andre d 2002-09-24 02:27:36 (724 views)

Trial and error, but it is easy - DonIstook 2002-09-24 04:46:52 (841 views)

Did you use software to measure any particular value? What did you use to confirm that you had - what's that smell?st 2002-09-24 05:50:04 (712 views)

The software was my finger on the valve to feel if it opened or not at idle. - DonIstook 2002-09-24 05:56:41 (835 views)

Cool, thanks. - what's that smell?st 2002-09-24 05:57:27 (668 views)

Yeah, that would be my next question also. - what's that smell?st 2002-09-24 04:17:03 (600 views)

So what parts do i need?? - dohc 2002-09-24 00:18:16 (856 views)

Twin Greddy Type S.... - EP : Dark Cloud S4 2002-09-23 23:31:06 (2978 views)

Re: Twin Greddy Type S.... - pythaguras 2003-10-02 22:59:03 (133 views)

I WANT BLOW OFF!!!!..... - nicz28 2002-09-24 13:55:45 (2378 views)

With a DSM adaptor I do believe!! hjahahaha nice! - Milpitas2.7T 2002-09-23 23:32:58 (853 views)

Hi, so basically any BOV would work on 1.8T as long as I get the adapter kit from Turboxs? Thanks. - Jack Wang 2002-09-23 22:44:28 (1132 views)

no meng.... - wnut 2002-09-24 09:53:19 (900 views)

Oh, Ok, so for 1.8T the BOV will be where the BPV is..am I thinking right? - Jack Wang 2002-09-24 11:49:08 (1874 views)

there's about 3 ways to mount a bov on a 1.8t - wnut 2002-09-24 12:12:22 (1246 views)

Is there much to do with the H valve to install it? Or is it just "plug and play"? - naptownnogaro 2002-09-23 22:16:47 (840 views)

iirc they're about $150 a piece... - wnut 2002-09-23 22:20:53 (1181 views)

thanks - naptownnogaro 2002-09-23 22:24:41 (616 views)

You are the man. - nyet 2002-09-23 21:59:45 (703 views)

this is what i've been saying all along... - wnut 2002-09-23 21:53:58 (1020 views)

Saw this on rookie Edwards car . . . look a mechanical throttle valve . . . . ! - boscoj 2002-09-23 21:11:56 (1539 views)

i'm 99% sure that it's a forge bov. - wnut 2002-09-23 22:29:32 (1706 views)

You can barely see the pop off valve on Galati's and Bell's car in this pic - boscoj 2002-09-23 22:38:57 (1756 views)

Yup, they have a single BOV (which Subaru folks use) - Audiboy 2002-09-24 08:54:07 (827 views)

by jove I've think you've got something . . . - boscoj 2002-09-23 22:36:56 (718 views)

This is the one that I found on the site is this the right one??? - FAS4T 2002-09-23 20:53:09 (1917 views)

that bov is crazy loud! - wnut 2002-09-23 22:31:39 (1417 views)

As Stealth4 says-I think he means this one. You're going to order two of them tomorrow, aren't you? - gr 2002-09-23 21:06:32 (912 views)

I could buy them right now, tempting! but what about the mounting hdwe? - FAS4T 2002-09-23 21:12:32 (921 views)

I think its the regular H one, unless ur making ajoke - Stealth4 2002-09-23 20:54:50 (659 views)

no really I think I may be blind this is the only one with an H that I found on the site.... - FAS4T 2002-09-23 21:06:48 (891 views)

Damn you and my credit card bills!!!!!!!! - Giga2Envy 2002-09-23 20:23:25 (686 views)

So... how much do these bad boys go for? ;-) Where can I get em? - zapco98 2002-09-23 20:15:20 (841 views)

http://www.turboxs.com/ - DonIstook 2002-09-23 20:17:28 (1938 views)

How about the mounting hardware? Is it the same as they have for the "1.8T?" - zapco98 2002-09-23 20:30:41 (791 views)

you are awesome, thanks for the real life tested info. - Stealth4 2002-09-23 20:12:58 (791 views)

hey, you said a "little tip" - Odorless-Clandestine 2002-09-23 20:10:59 (921 views)

Well, the tip itself is small, but it took a while to get there - DonIstook 2002-09-23 20:16:02 (1073 views)

Well, it's tremendous to see someone take the time to post up such concise and useful info (truly). - Odorless-Clandestine 2002-09-23 20:21:47 (913 views)

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