Author Topic: wow, I'm another newbie, there's a lot here! (Read 9375 times)

92UrS4 · « **Reply #30 on:** February 10, 2006, 03:00:39 PM »

Well the idea behind dumping the excess pressure is less turbo wear. Really though, there are just show.

I got ina discussion over on the tex in the B6 forum I believe about a BOV for the 2.0T. Basically the usual everyone jumping on it. It is switchable so you can go from full recirc like a bypass valve to partial blow off or full blow off.

No performance gain, just a show off, and a $180 part.

On a side note, the new bypass valve system on the 2.0T FSI is really neat.

Eric18T · « **Reply #31 on:** February 10, 2006, 03:03:44 PM »

Quote from: "gietl";p="41525"

On a side note, the new bypass valve system on the 2.0T FSI is really neat.

it's still not as cool as the bub rub approved wooo wooo tips.

Rocky Mountain Club B5 · « **Reply #31 on:** February 10, 2006, 03:03:44 PM »

92UrS4 · « **Reply #32 on:** February 10, 2006, 03:06:50 PM »

Very true, I need some whistle tips.

shummer · « **Reply #33 on:** February 10, 2006, 03:13:16 PM »

Come on guys. It's not that hard. Do you want a cool noise or CEL? PSSSSSSHHHHHTTTTTT. Jamathe should hook up a ballon to it to see how fast he can fill it up. The kids at the preschool would love it.

jayryan · « **Reply #34 on:** February 10, 2006, 04:36:10 PM »

:lol:

BHase · « **Reply #35 on:** February 10, 2006, 04:54:55 PM »

I think the BOV would be cool if you got some pulsing neon lights to go underneath your car...

In either case, welcome to the club!

P.S.: POV's are bannable offenses here too.

SweetVW · « **Reply #36 on:** February 10, 2006, 05:22:50 PM »

Quote from: "shummer";p="41528"

Jamathe should hook up a ballon to it to see how fast he can fill it up. The kids at the preschool would love it.

LOL There you go, something for the car show GTG's!

Nickle · « **Reply #37 on:** February 10, 2006, 06:31:26 PM »

A CEL stands for what?

ianacole · « **Reply #38 on:** February 10, 2006, 06:32:42 PM »

Check Engine Light, also referred to as a MIL (Malfunction Indicator Lamp).

Nickle · « **Reply #39 on:** February 10, 2006, 06:40:44 PM »

LOL. I did know that. Pardon the blond moment.

So, here is my understanding of why our friendly little CEL shows his beautiful yellow color. The nearly instantaneous pressure drop caused by a BOV induces a fuel spike. The engine picks that up from the O2 sensors, and tells the engine something isn't right. This supposedly has something to do with the MAF located before the turbo, correct? I don't know any of that for a fact. It's stuff I’ve pieced together after reading numerous VAG forums. I guess I'm looking for an explanation of why our engines respond so poorly to BOV's. Not that I'm thinking about getting one, I have a 710N that works fine for me. I'm just a Mechanical Engineering student with way too much curiosity.

ianacole · « **Reply #40 on:** February 10, 2006, 06:46:18 PM »

I actually think it's because the engine is morally opposed to the BOV. In this instance, CEL stands for Contraband Equipment - Loser. :lol:

Actually, I don't know the technicals of it. It could have something to do with the fact that once recirculation is engaged, the system is expecting a certain amount of pressure modulation based on that. When purging to atmosphere, the amount of recirculation is reduced, thereby confusing the system. On the GTI, the DV is between the MAF and the turbo.

Nickle · « **Reply #41 on:** February 10, 2006, 06:54:38 PM »

Quote from: "ianacole";p="41552"

I actually think it's because the engine is morally opposed to the BOV. In this instance, CEL stands for Contraband Equipment - Loser. :lol:

LOL (Good reply :lol:)

Quote from: "ianacole";p="41552"

Actually, I don't know the technicals of it. It could have something to do with the fact that once recirculation is engaged, the system is expecting a certain amount of pressure modulation based on that. When purging to atmosphere, the amount of recirculation is reduced, thereby confusing the system. On the GTI, the DV is between the MAF and the turbo.

Got me. If anyone knows, I am very curious.

gragravar · « **Reply #42 on:** February 10, 2006, 07:07:38 PM »

Audi's study manual on the design for the 2.7T has the following to say about the diverter valve:

"The pressure limiting valve and the non-return
valve control the return of these vapours and
gases to the engine, depending on the intake
The pressure limiting valve limits the vacuum
in the crankcase. If the vacuum in the
crankcase exceeds a defined value, the
diaphragm is drawn over the connection
against the force of the spring and closes the
connection. The valve is designed in such a
way that it allows a small quantity to pass
through when closed. This prevents the engine
oil being drawn into the intake tract and has no
adverse effects on engine breathing."

gragravar · « **Reply #43 on:** February 10, 2006, 07:10:12 PM »

oh, and for those engineers who are interested, the entire study guide can be found at:
http://www.s4-mtm.com/images/Audi_S4_engine_english.pdf

ianacole · « **Reply #44 on:** February 10, 2006, 07:17:56 PM »

*ahem* geek

gragravar · « **Reply #45 on:** February 10, 2006, 07:23:10 PM »

LOL, yeah? and?

ianacole · « **Reply #46 on:** February 10, 2006, 07:26:03 PM »

hehehehe...

jayryan · « **Reply #47 on:** February 10, 2006, 07:41:55 PM »

That hurts my eyes. The yellow text.

Nickle · « **Reply #48 on:** February 10, 2006, 08:01:02 PM »

Quote from: "gragravar";p="41557"

Audi's study manual on the design for the 2.7T has the following to say about the diverter valve:

"The pressure limiting valve and the non-return
valve control the return of these vapours and
gases to the engine, depending on the intake
The pressure limiting valve limits the vacuum
in the crankcase. If the vacuum in the
crankcase exceeds a defined value, the
diaphragm is drawn over the connection
against the force of the spring and closes the
connection. The valve is designed in such a
way that it allows a small quantity to pass
through when closed. This prevents the engine
oil being drawn into the intake tract and has no
adverse effects on engine breathing."

Sweet. That helps. So really without a slight intake pressure, oil will enter the intake system. Is that a correct statement?

gragravar · « **Reply #49 on:** February 10, 2006, 08:08:53 PM »

that is how I read it, and that could cause fouling of the o2 sensors which would set off the CEL.

copassatguy · « **Reply #50 on:** February 10, 2006, 08:29:59 PM »

Quote from: "ianacole";p="41552"

I actually think it's because the engine is morally opposed to the BOV. In this instance, CEL stands for Contraband Equipment - Loser. :lol:

Actually, I don't know the technicals of it. It could have something to do with the fact that once recirculation is engaged, the system is expecting a certain amount of pressure modulation based on that. When purging to atmosphere, the amount of recirculation is reduced, thereby confusing the system. On the GTI, the DV is between the MAF and the turbo.

Here we go again with the acronyms! :lol:

jayryan · « **Reply #51 on:** February 10, 2006, 09:08:21 PM »

Car's Exceptional Longevity

jamathe · « **Reply #52 on:** February 11, 2006, 12:41:23 AM »

If only I knew more about cars, I could possibly get this discussion to go forever! haha Let's hope the BOV is the only dumb part of the car. :-)

ianacole · « **Reply #53 on:** February 11, 2006, 01:04:08 AM »

Quote from: "jamathe";p="41584"

If only I knew more about cars, I could possibly get this discussion to go forever!

That hasn't kept me from trying :lol:

gragravar · « **Reply #54 on:** February 11, 2006, 03:57:55 AM »

Quote from: "ianacole";p="41586"

Quote from: "jamathe";p="41584"
If only I knew more about cars, I could possibly get this discussion to go forever!

That hasn't kept me from trying :lol:

me either. we can keep this up for quite a while you know. :roll:

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Author Topic: wow, I'm another newbie, there's a lot here! (Read 9375 times)

Rocky Mountain Club B5