Air Intake and A restriction?

B6/7 S4/RS4
#1

I’ve been looking over my 3.0L study guide and I stumbled onto something very interesting that I thought I would throw out there to share.

I found this and realized that the S4 and Rs4 have close to the same air box so this pertains to those cars as well.

The B6 A4 has a larger intake by 50% then previous years. So the air box it self should be more then able to handle the power. How ever when looking deeper into the information available it seems there might be a indication of a restriction.

Look this picture over and please share your thoughts.

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

#2

That really is a great picture diagramming the intake, so thanks for posting. I put some ideas in the 3.0 thread, how right they are I dunno, but I just try to brainstorm when I see something.

#3

Here’s the RS4 intake system, still having trouble uploading files here so its hosted elsewhere

http://img35.imageshack.us/img35/2222/rs4intake.jpg

#4

So that scoop that goes into the fender well faces the rear of the car. Is the air flowing past said scoop creating a vacuum creating negative pressure that is affecting overall air flow?

#5

Joe I can’t give you a 100% answer on that. I can say that bringing in air through the method there using seems to be designed to slow down air flow. If its negative pressure causing air to be pulled into the stream or positive air pressure going into the air box. There is a amount of turbulence that seem to be done with the intention to slow down the air.

#6

After reading this. Im going to do a little research on the S5 air box and we can see measurement and size wise how they stack up. Ill look for the back air feed as well

#7

anyone know if the helmholtz resonator is present on the S4 and RS4? And if it’s hurting at all?

Anyone ever remove it to see what the sound is like?

#8

^thankfully it seems the V8’s don’t have them (the RS4 diagram I posted doesn’t show one and I’ve never seen one).

#9

Add the S5 to the list of dosn’t haves. I didn’t see one on my car

#10

it’d be inside the tube though so would be tough to know if it was there really. RS4 also may not have it…but the S4 might.

#11

well from looking through all the S4 air inlet pieces there was no resonator in mine. They normally have to be separate to function, the air enters and forms a standing wave which helps cancel sound.

#12

NO resonator.

Ive been working with the RS4’s and the RS4 air box if you close off the fender scoop gains lots more air. The only bad thing is that there is too much air and the car will actually shut off at high RPM when you back out of the throttle.

#13

I know we got a few more Rs4 guys on here. I remember reading on another web site how one Rs4 member was getting pretty good results from modifying his air box. This would be a good thing for a few members here to try. I have the S5 and my air box is jacked up looking. Looks like the rs4 and S4 can get some more gusto out of just elimination of the air comming from the wheel section.

can someone take this picture and make it bigger and host it here. I think this RS4 air box has the same limmiting fender air system that the 3.0 has but this picture is too small.

http://img35.imageshack.us/img35/2222/rs4intake.jpg

#14

I’m pretty sure that is what Justin was describing in the post above yours. Looks like there is the potential for an issue when letting off the throttle at higher RPM’s.

#15

can you expand on that in the RS4 section maybe?

#16

^What Saki? Aren’t we in the RS4 section?

#17

I’m so confused :frowning:

hahaha I thought this was B6 A4 3.0 because the study guide referenced in the OP was for the 3.0

Great. OK…justin…can you expand on that here please?!