Air Intake and A restriction?

B6 A4
#21

Wow. Just, wow. What did facts ever do to you? You seem to hate them a lot. What is factually wrong? Did you read what I wrote? Or are you going to just keep repeating the same flawed information no matter what? You are also still confusing noise and sound. I welcomed opposing opinions backed by fact. Where are the irrefutable facts that you claim can be backed up?

I referenced the same Picture form SSP_255, 3.0L self study guide. And yes, Audi tells us exactly how it works. My explanation is consistent with what is described and written in the picture. Who says that Audi didn’t make the best design? You just choose to interpret it your own way. So far, it has NOT been proven that blocking off the air box or removing the resonator makes more power. I see most people saying that they could not measure any difference but it sounds different.

Maybe others will be interested in this. Here are some references to show that this is not voodoo science and that is factual:
http://www.planetsoarer.com/resonator/ResonatorsAcoustic.htm
http://blog.autospeed.com/2003/11/30/those-funny-things-teed-into-intakes
http://www.brighthubengineering.com/machine-design/84316-how-intake-resonators-improve-volumetric-efficiency
http://www.ehow.com/info_12156112_air-intake-resonator-do.html
http://www.ipdusa.com/blogs/63/air-intake-advice

#22

Rev,

This may not apply, but did you do a Throttle Body Alignment after the ECU install?

Throttle Body Alignment:
Turn the key to the position just before the starter turns (do not start) push the gas peddle all the way down and wait wait 3 seconds and turn the key all the way back (off) but do not remove it. Release the gas peddle and wait 2 minutes. You should hear some clicks as it resets. Remove key then put it back in and start the car. you should notice a better throttle response.

#23

Without quoting that long quote.

here is what you missed. There is a guy that went to the track on the air box. Closed it off and went faster. case closed.

Did you read your link… no huh… Im not looking to argue… Im looking to help educate you… Your right in some spots missing it in others…

ok

your points your missing. Audi in its rightings. and I quote…

From Audi
The air intake noise is damped by a helmoltz resonator… This dampenes noise from 4000-5000rpm…

Did you miss that. Noting about needing this to be for performance… To talk more educated… The intake track in the intake manifold switches over at 4500. This will cause a ton of noise… motor noise…

Resonators are helpful for volume efficency… in this case its not why its being used… This is described by Audi for noise canlelations ONLY…What your keeping out is that resonators only work for a small part of the rev range and there helpful in performance only for a small needed range… if there needed at all… Now if your going and creating a high pressure area in your air box and then getting the motor to move faster with an exhaust the resonator is now usless as teh VE of the motor has increased and now the Resonator… if it is there for performance…even tho audi themselfves say its not… is no longer efficenct…

Apparently you don’t know much about mechanics… If you want to prevent frequency bounce back… you charge the intake track… you do this by blocking off the air box or by creating a ram air effect… Or you up the VE of the motor… you do this by… a program… exhaust… the list goes. on…

from just two of the links you provided…

The point to be noted here is that you will get maximum beits of increased volumetric efficiency only if the engine running frequency and the resonator frequency are properly tuned.

Then there is the pressure system that creating the flow restriction SLOWS down the air.

resonators tuned to a particular frequency and connected to the intake system.

Once again. Defend your point… WHY is this not on the performance motors then? if this is what your chalking this up to be… show me this on an R8… and S4… S5… why is there not one on the 3.2…

simple… the intake tract on the 3.0 is loud and its a big motor for such a little car the power isn’t big and the motor isn’t moving fast through the RPM rage… this is a big formula for a loud intake track… Thus a resonator is needed at the 4000 range…

You don’t have to believe me but audi tells you right in the discription and STUDY guide why its there…

inase you missed it

http://audirevolution.net/addons/albums/images/862433931.jpg

#24

None of this would be your issue. Stalling issues with the Auto guys tends to be from a small vac leak… did you change all yoru vac stuff… try there first. Check your long term fuel trims… maybe make a new thread.

#25

LOL! Real scientific. A single run on a car with vacuum leaks. It needed 3 runs stock and 3 runs modified under the same conditions to be considered irrefutable.

BTW, AFAIK, he went to the track with an open element and switched to a hacked up stock intake. No where near a controlled experiment. Shows more so that a stock intake works better than open element and may have worked better if not modified. Who knows?

You ARE looking to argue since you are not educating me. This is real simple, just show me the facts that hacking up the stock intake works. i don’t think you can

#26

So far everyone has noticed a differece… It was shown at the track… still not enough… you didn’t answer the question if this was for performance where is it on the R8 S4 S5 the A6 3.2

I say its for noise as most cars with loud intake track noise have used these… You say…

Quote by 4g3n7 :
The intake resonator is not a silencer and is not designed to make the car more appealing to soccer

I say and take the time to read the part where AUDI says this is used to DAMPEN intake noise…

http://audirevolution.net/addons/albums/images/862433931.jpg

According to you… The proof from the track… The proof from Audi and the proof from the other members is wrong. AUDI IS LIEING TO US… all because you read about silencers on Google one night…

#27

Not done arguing?
Everyone? I think not. Still not enough, where are the facts? Shown at the track? great, let’s see the results.

Who cares? I never mentioned anything other than 3.0L. This is the B6 A4 forum. I am not going to do the research on their designs. You do it if you are so interested.

blah blah blah. You still want to interpret the blurb from Audi your own way. No where does it say that the intake is defective.

You claim “everyone” sees a difference. I think these subjective claims are more urban myth than truth. If anyone can come up with some empirical evidence then present it. I see that quite a few folks have done the mod. I am sure someone logged before and after. Hasn’t anyone measured a difference at the track? Other than the first one who switched from open element to Stock Air Box. Oh wait, there was the test that shoved a piece of wood under the gas pedal on a Drive By Wire and had 2 wildly different measurements on only 2 runs. Maybe the third run would have mashed the carpet down even further and gotten better results.

At least my research cites references.

#28

Sorry you must have missed where I posted FACTS FROM AUDI… Ill do it again and quote what you said…

This time read where Audi said this was for NOISE… and that you said it wasn’t… You clearly missed that… Not one thing in your argument stands up… Audi just said you were wrong… Then you can’t back this performance part up giving us ONE example of Audi using this for any perfomance improvement as you just said… Not one… since you can’t offer one… I ll help you… This NON perfomance mod thats not for performncce its for cancling sound… is not on a S4 4.2 or a S8 4.2 or a 3.2 A6 or the RS4 all performace cars.

Quote by 4g3n7 :
The intake resonator is not a silencer and is not designed to make the car more appealing to soccer moms

I say and take the time to read the part where AUDI says this is used to DAMPEN intake noise…

http://audirevolution.net/addons/albums/images/862433931.jpg

Its not a blurb… this is the AUDI TRAINING GUIDE… TO TRAIN people on what parts on on the motor for… FACTS YOU seem to egnore them… The FACTS are right there in the AUDI STUDY guide…

The only thing your research has shown is you CAN’T READ THE STUDY GUIDE FROM AUDI THAT TELLS YOU WHAT THE PART IS THERE FOR…

#29

LOL! You keep posting the same thing over and over and I have already told you that you are misinterpreting it for your own purpose thinking it’s going to defy logic at some point. It doesn’t and it won’t. Someone else needs to explain it to you.

I stated my opinion on why I wouldn’t screw up my intake as suggested and you get all defensive but without any defense! There is no proof that it does anything. Why would anyone do this to their car without understanding what it does and if it benefits them? I hope my post makes somebody at least stop and think before just blindly trusting in something they read on a forum without any proof that it works.

You can keep arguing by yourself and try to make yourself look like you know what you are talking about. Up to this point you have looked pretty foolish. Post that picture a few more times, maybe you will actually understand what it says at some point. I am done here.

Good luck to you and everyone else!

#30

4g3n37 sounds like one of the guys datadatum was describing in this post

http://audirevolution.net/forum/index.php?topic=1949.msg52217#msg52217

Came here and posted a pile of stuff he just learned, and just wanted everyone to see how smart he is. Unfortunately all he did is show us what he doesn’t know, and tried to make a few things fit into his theory.

When a new person comes to a forum, they love to try to make a splash and show everyone what they’re all about. Unfortunately he has just shown that

a) he can’t read (the study guide is VERY clear)
b) he is more interested in his own ego than in making anyone’s car faster

Those aren’t exactly good things, and people won’t last on this forum with that mentality.

#31

He posted the same thing because you’re being pigheaded and ridiculous and are ignoring it. You’re not reading the fucking screen. Audi explains why the resonator is there. To quell an unpleasant noise on an otherwise sedate car that was originally marketed to people looking for a smoothe highway cruising family sedan, and who didn’t want the clatter of the 4 banger 1.8T…or the roar of the S4 4.2. That’s what the 3.0 was marketed as. They aren’t selling the 3.0 A4 to people who slap a fart can on a car and want a loud ass intake. They’re selling to people who appreciate quiet.

That part is there for one purpose, and one purpose only: to create a smoothe and calm engine note through the rev range and to eliminate the burst of sound that happens on crossover in the 4000+ RPM range. It’s a resonator. It is there to offset an irritating sound.

I don’t know why you want to talk about the various types of noise you learned about in one of your 2nd year engineering courses. This is a fucking sound inhibitor on a family sedan. Just as the resonators in the exhaust are. just as the baffling in the stock mufflers are. When we want a freer flowing exhaust to allow the NA motor to improve its volumetric efficiency and make more power, guess what we do. WE ELIMINATE THEM. If we find other inhibitors on the intake side, we eliminate them as well.

They are all designed to make the car sound civilized. To make power (which is what the 3rd and 4th hand owners of these cars want, most of those who are posting here anyway) you need to eliminate restrictions and that means you need to allow for more noise.

There is no helmholtz resonator on ANY of the S/RS models. Why? because buyers of the S/RS models are fine with a litle bit of grunt. They want performance. They accept increased sound levels in the pursuit of performance.

#32

This is what happens when you try and use words you don’t understand. Empirical evidence is gathered based on observations as opposed to theories. The wood block test is simple and it works. You move the gas pedal to the exact same position each time. If it didn’t make a difference the car wouldn’t go faster. The results weren’t dramatic, they were in line with the difference made by sealing off the airbox.

Oh, and it was tested on the 1/4 with verified results (2 or 3 10ths improvement)

derp derp

#33

Ahhhhh knowlegable people…sakimano… meisteh… nice to have voice of reason amd fact back in the thread… I was worried I was going to hwve to circle and under line the words on the study guide…

#34

If laminar flow helps with performance, than why would people take catalytic converters out? The cells it help to remove turbulence from the air as it passes through.

The resonator on the intake will essentially create a dead spot for air in the intake. While I doubt it is the major factor in the improved performance, it probably still has an impact. I’d guess that blocking off the fender intake portion is the main factor in getting more power, but every little bit helps.

What would be nice to find would be a silicone intake tube to replace the ribbed sections on the intake. I’m guessing that there isn’t nearly enough demand to warrant producing them though.

#35

What would you prefer for strictly evacuating or introducing a gas as quickly as possible:

A) a 1⅜ pipe with smoothe sides promoting laminar flow

B) a 4" pipe with a rough internal surface causing non-laminar flow, yet which outflows the smaller pipe 4 fold

?