AudiWorld Forums: Thanks Don! I still have a question about the design with a MAF though.

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Thanks Don! I still have a question about the design with a MAF though.

Posted by: Joshua (wishbone) on 2002-09-24 10:54:23
Account #: 12268

In Reply to: BOV's...a little tip posted by DonIstook on 2002-09-23 20:07:41

The number one reason most people on this board attack BOVs is because they feel that any car that runs a MAF will run rich. When you vent air that you have already metered into the atmosphere your vehicle will dump too much fuel into the engine. How is this circumvented? Does this not happen?

Do you plumb the BOV directly to the manifold or do you still use the advanced electronic controlled S4 system for the BOV control (valve N249)..

thanks

---
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 (19088 views)

Re: BOV's...a little tip - pythaguras 2003-10-02 23:02:40 (275 views)

does anyone know if the .... - just_a_kid 2002-11-19 22:14:19 (1534 views)

NEWBIE to Audis...been a Honda/Acura guy since high school...NEED HELP! NEED GUIDANCE! - t4t3hybrid 2002-11-01 14:24:47 (2167 views)

Just Bought One, I will have a writeup this upcoming friday (Oct 4th) - STKSKI 2002-09-29 20:20:31 (1446 views)

Don - some comments for your consideration - LONG - shortyq 2002-09-24 23:09:39 (1680 views)

Very interesting, as are your cars : ) - what's that smell?st 2002-09-25 10:08:32 (959 views)

Interesting info - thanks Scott. BTW I've been practicing my left foot braking. =) - markbradford 2002-09-25 07:16:49 (993 views)

Okay let's review: How much sheer abuse did BOV folks endure here before this? - sans-audi 2002-09-24 16:11:49 (1231 views)

A ton. Why? Because they were FULL OF CRAP. - nyet 2002-09-24 16:13:37 (1368 views)

Some people admitted it, in their defense : ) - what's that smell?st 2002-09-24 17:05:17 (793 views)

Well, yeah. - sans-audi 2002-09-24 16:18:08 (705 views)

Don what about "engine wash" - WJM 2002-09-24 14:52:35 (1368 views)

All cars are subject to the same emission standards, both high and low rpms - DonIstook 2002-09-24 19:30:47 (1048 views)

very true A/F ratios are what they are... - WJM 2002-09-25 12:28:38 (831 views)

Thanks Don! I still have a question about the design with a MAF though. - Joshua (wishbone) 2002-09-24 10:54:23 (984 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 (930 views)

Naw, the car runs rich in essense because say for example you take your Forge valve - zapco98 2002-09-24 11:23:15 (1302 views)

ah got it. - nyet 2002-09-24 11:24:22 (650 views)

Yeah I got what he was saying with idle and non-boost applications.. - Joshua (wishbone) 2002-09-24 11:15:51 (804 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 (866 views)

bless you for these informative posts... - SameerP 2002-09-24 09:45:59 (1020 views)

what about metered air dumped between shifts? - BOOSTD 2002-09-24 09:39:49 (777 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 (872 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 (846 views)

the mix getting to the O2 sensors is probably how it knows... - TRM @ velozt.com 2002-09-24 11:09:27 (838 views)

Does it matter how much is coming back?? - Joshua (wishbone) 2002-09-24 11:07:16 (737 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 (837 views)

Well... - Joshua (wishbone) 2002-09-24 12:38:34 (609 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 (722 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 (615 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 (834 views)

track this thread FOREVER! good stuff Don - thanks for sharing. - TRM @ velozt.com 2002-09-24 04:58:09 (575 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 (719 views)

Trial and error, but it is easy - DonIstook 2002-09-24 04:46:52 (839 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 (710 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 (833 views)

Cool, thanks. - what's that smell?st 2002-09-24 05:57:27 (665 views)

Yeah, that would be my next question also. - what's that smell?st 2002-09-24 04:17:03 (599 views)

So what parts do i need?? - dohc 2002-09-24 00:18:16 (855 views)

Twin Greddy Type S.... - EP : Dark Cloud S4 2002-09-23 23:31:06 (2975 views)

Re: Twin Greddy Type S.... - pythaguras 2003-10-02 22:59:03 (129 views)

I WANT BLOW OFF!!!!..... - nicz28 2002-09-24 13:55:45 (2376 views)

With a DSM adaptor I do believe!! hjahahaha nice! - Milpitas2.7T 2002-09-23 23:32:58 (851 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 (1129 views)

no meng.... - wnut 2002-09-24 09:53:19 (899 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 (1866 views)

there's about 3 ways to mount a bov on a 1.8t - wnut 2002-09-24 12:12:22 (1245 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 (839 views)

iirc they're about $150 a piece... - wnut 2002-09-23 22:20:53 (1179 views)

thanks - naptownnogaro 2002-09-23 22:24:41 (613 views)

You are the man. - nyet 2002-09-23 21:59:45 (702 views)

this is what i've been saying all along... - wnut 2002-09-23 21:53:58 (1019 views)

Saw this on rookie Edwards car . . . look a mechanical throttle valve . . . . ! - boscoj 2002-09-23 21:11:56 (1534 views)

i'm 99% sure that it's a forge bov. - wnut 2002-09-23 22:29:32 (1705 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 (1754 views)

Yup, they have a single BOV (which Subaru folks use) - Audiboy 2002-09-24 08:54:07 (826 views)

by jove I've think you've got something . . . - boscoj 2002-09-23 22:36:56 (716 views)

This is the one that I found on the site is this the right one??? - FAS4T 2002-09-23 20:53:09 (1914 views)

that bov is crazy loud! - wnut 2002-09-23 22:31:39 (1415 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 (910 views)

I could buy them right now, tempting! but what about the mounting hdwe? - FAS4T 2002-09-23 21:12:32 (919 views)

I think its the regular H one, unless ur making ajoke - Stealth4 2002-09-23 20:54:50 (657 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 (890 views)

Damn you and my credit card bills!!!!!!!! - Giga2Envy 2002-09-23 20:23:25 (683 views)

So... how much do these bad boys go for? ;-) Where can I get em? - zapco98 2002-09-23 20:15:20 (839 views)

http://www.turboxs.com/ - DonIstook 2002-09-23 20:17:28 (1937 views)

How about the mounting hardware? Is it the same as they have for the "1.8T?" - zapco98 2002-09-23 20:30:41 (789 views)

you are awesome, thanks for the real life tested info. - Stealth4 2002-09-23 20:12:58 (789 views)

hey, you said a "little tip" - Odorless-Clandestine 2002-09-23 20:10:59 (918 views)

Well, the tip itself is small, but it took a while to get there - DonIstook 2002-09-23 20:16:02 (1072 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 (910 views)

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