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Does it matter how much is coming back??

Posted by: Joshua (wishbone) on 2002-09-24 11:07:16
Account #: 12268

In Reply to: Well - I was thinking about this the other night - I don't think the ECU really knows what is coming posted by zapco98 on 2002-09-24 10:43:09

If it's compressed it still has to come through the MAF and it will get metered. As air passes through the MAF the vehicle knows how much is entering the system and will provide the fuel necessary. Even if it get's compressed, the air still has to pass through the MAF, it has to get that air from somewhere? The ECU knows the ammount of air in the system and as you open the throttle plate it will provide the fuel necessary.

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2000 2.7t S4
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Thread:

BOV's...a little tip - DonIstook 2002-09-23 20:07:41 (19108 views)

Re: BOV's...a little tip - pythaguras 2003-10-02 23:02:40 (277 views)

does anyone know if the .... - just_a_kid 2002-11-19 22:14:19 (1539 views)

NEWBIE to Audis...been a Honda/Acura guy since high school...NEED HELP! NEED GUIDANCE! - t4t3hybrid 2002-11-01 14:24:47 (2171 views)

Just Bought One, I will have a writeup this upcoming friday (Oct 4th) - STKSKI 2002-09-29 20:20:31 (1452 views)

Don - some comments for your consideration - LONG - shortyq 2002-09-24 23:09:39 (1684 views)

Very interesting, as are your cars : ) - what's that smell?st 2002-09-25 10:08:32 (962 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 (1233 views)

A ton. Why? Because they were FULL OF CRAP. - nyet 2002-09-24 16:13:37 (1370 views)

Some people admitted it, in their defense : ) - what's that smell?st 2002-09-24 17:05:17 (798 views)

Well, yeah. - sans-audi 2002-09-24 16:18:08 (707 views)

Don what about "engine wash" - WJM 2002-09-24 14:52:35 (1373 views)

All cars are subject to the same emission standards, both high and low rpms - DonIstook 2002-09-24 19:30:47 (1053 views)

very true A/F ratios are what they are... - WJM 2002-09-25 12:28:38 (837 views)

Thanks Don! I still have a question about the design with a MAF though. - Joshua (wishbone) 2002-09-24 10:54:23 (986 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 (937 views)

Naw, the car runs rich in essense because say for example you take your Forge valve - zapco98 2002-09-24 11:23:15 (1311 views)

ah got it. - nyet 2002-09-24 11:24:22 (654 views)

Yeah I got what he was saying with idle and non-boost applications.. - Joshua (wishbone) 2002-09-24 11:15:51 (811 views)

Don, can you confirm that these are the right ones? - DABearS4 2002-09-24 10:28:27 (1042 views)

Thanks for the info! Now my S4 will be perfect! - DABearS4 2002-09-24 10:25:35 (869 views)

bless you for these informative posts... - SameerP 2002-09-24 09:45:59 (1024 views)

what about metered air dumped between shifts? - BOOSTD 2002-09-24 09:39:49 (781 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 (879 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 (851 views)

the mix getting to the O2 sensors is probably how it knows... - TRM @ velozt.com 2002-09-24 11:09:27 (842 views)

Does it matter how much is coming back?? - Joshua (wishbone) 2002-09-24 11:07:16 (742 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 (844 views)

Well... - Joshua (wishbone) 2002-09-24 12:38:34 (615 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 (728 views)

*and the whole S4 group moves to BOV's* ;) great info Don! - Audiboy 2002-09-24 08:51:28 (971 views)

;-) - TRM @ velozt.com 2002-09-24 08:59:59 (618 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 (840 views)

track this thread FOREVER! good stuff Don - thanks for sharing. - TRM @ velozt.com 2002-09-24 04:58:09 (577 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 (725 views)

Trial and error, but it is easy - DonIstook 2002-09-24 04:46:52 (842 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 (716 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 (838 views)

Cool, thanks. - what's that smell?st 2002-09-24 05:57:27 (670 views)

Yeah, that would be my next question also. - what's that smell?st 2002-09-24 04:17:03 (602 views)

So what parts do i need?? - dohc 2002-09-24 00:18:16 (860 views)

Twin Greddy Type S.... - EP : Dark Cloud S4 2002-09-23 23:31:06 (2979 views)

Re: Twin Greddy Type S.... - pythaguras 2003-10-02 22:59:03 (135 views)

I WANT BLOW OFF!!!!..... - nicz28 2002-09-24 13:55:45 (2381 views)

With a DSM adaptor I do believe!! hjahahaha nice! - Milpitas2.7T 2002-09-23 23:32:58 (854 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 (1134 views)

no meng.... - wnut 2002-09-24 09:53:19 (903 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 (1876 views)

there's about 3 ways to mount a bov on a 1.8t - wnut 2002-09-24 12:12:22 (1247 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 (843 views)

iirc they're about $150 a piece... - wnut 2002-09-23 22:20:53 (1184 views)

thanks - naptownnogaro 2002-09-23 22:24:41 (619 views)

You are the man. - nyet 2002-09-23 21:59:45 (707 views)

this is what i've been saying all along... - wnut 2002-09-23 21:53:58 (1021 views)

Saw this on rookie Edwards car . . . look a mechanical throttle valve . . . . ! - boscoj 2002-09-23 21:11:56 (1542 views)

i'm 99% sure that it's a forge bov. - wnut 2002-09-23 22:29:32 (1709 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 (1759 views)

Yup, they have a single BOV (which Subaru folks use) - Audiboy 2002-09-24 08:54:07 (828 views)

by jove I've think you've got something . . . - boscoj 2002-09-23 22:36:56 (719 views)

This is the one that I found on the site is this the right one??? - FAS4T 2002-09-23 20:53:09 (1919 views)

that bov is crazy loud! - wnut 2002-09-23 22:31:39 (1419 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 (915 views)

I could buy them right now, tempting! but what about the mounting hdwe? - FAS4T 2002-09-23 21:12:32 (923 views)

I think its the regular H one, unless ur making ajoke - Stealth4 2002-09-23 20:54:50 (660 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 (892 views)

Damn you and my credit card bills!!!!!!!! - Giga2Envy 2002-09-23 20:23:25 (689 views)

So... how much do these bad boys go for? ;-) Where can I get em? - zapco98 2002-09-23 20:15:20 (843 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 (796 views)

you are awesome, thanks for the real life tested info. - Stealth4 2002-09-23 20:12:58 (793 views)

hey, you said a "little tip" - Odorless-Clandestine 2002-09-23 20:10:59 (922 views)

Well, the tip itself is small, but it took a while to get there - DonIstook 2002-09-23 20:16:02 (1077 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 (916 views)

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