Another bad intake manifold

A6 All/ S6 All
#21

hi,

actualy, this small yellow piece was broken, it was falling out, when i ask in audi service they say it cannot be changed, it comes with complet manifold. i amanaged to fix it in and it was opening and closing flaps. but after readinf on forums what is happening with manifolds, i decided to open it. all they was in good condition, only one piece whitch is mounted to manifold and holding was broken ond stuck before valves. that is there ond end where is missing one flaps, i ripped it before taking pictures

http://audirevolution.net/addons/albums/images/703089617.jpg

#22

here is dyno, green is without flaps

http://i1289.photobucket.com/albums/b505/winceenzo/torque_zpsbojwblea.png

#23

Thanks for the dyno!

You did gain about 20 lb/ft torque at 6800 rpm. But, as predicted, you lost below 5000 rpm, where most of your daily driving is happening (I would guess).

There is a large area from 3000-4800 rpm where you are down on power, after the mod. You lose up to 20 lb/ft (I converted from Nm) at 3500 rpm.

That is not a huge loss, and I would rather take that then running a damaged intake manifold. But, you might want to look at a replacement intake when you have some cash. Youll gain back the extra torque on the low end.

#24

Agreed. I had a bad flapper motor and it was stuck open…felt dramatic decrease in tq, and top end was the same. Replaced the I’M with updated lart, much better post install. The dealer said the previous IM was partially warped, not sure I believe them but whatever.

Bte if you have so many IM, I assume you going to port and polished the one going on your project ? I thought to send mine to jhm or another exhaust shop to modify it…btw not sure if the s8 im fits the s6 but I’m told it’s slightly more efficient setup to the s6. It was my recollection that the s8 made the additional power due to slightly more aggressive tune and slightly more efficient IM. But cannot confirm that 100% I believe Jimmy and I tracked that down to 90% confidence .

#25

The part number for the S6 and S8 v10 intake manifolds are the same…

Updated part - 07L133185M

Original part - 07L133185C

Not sure if the updated version fixed the issue or not. If anyone has a failed M-version manifold, please let me know. Rumor is that JHM has a v10 S6 intake manifold right now, so maybe we will see an improvement in the future.

S8 has different intake track, but I think it is mostly the tuning that account for the slight (3%) difference in reported power. Likely, the higher HP rating on the S8 was just so it could be called ‘King of the Hill’

#26

Now that I think about it your right it wasn’t the IM, it was the intake tract. Thanks for correction :slight_smile:

#27

Karma bump for you. That’s incredible amount of good information to know the S8 and s6 have the same intake manifold

#28

^^

I can confirm ETKA lists the same p/n for both.

Cheers,
P

#29

Did you guys have an annoying ticking sound when you had the broken flap inside your intake manifold

#30

Is it faint and only there at low speed take off siuations.

#31

Bought my first Audi a few weeks back (07’ S6), and pulled the manifold to do the carbon cleaning/install some phenolic spacers.

Noticed chunks of my intake manifold flaps in the intake side of my heads. So you can add another person to the list of failed manifolds. I went ahead and dropped the $1,700 on a new one which i’ll install this weekend, however, if nearly every one of these manifolds fails why hasn’t anyone manufactured a replacement flapper system. 1. to save some money and 2. something a little more stout, that wont fail in the future???

I’m going to seriously look into using my bad manifold and parts to come up with a solution so others have an option other than buying an entire new manifold.

#32

You will love the spacers. They really help.

Sucks about the intake. The good news it from what i have heard the good folks at JHM have already started working on a solution along with a small list of other performance parts.

Welcome to the site. We all love V10 car pics. Feel free to toss some up or make a hello thread about you and your car

#33

Speaking of intake spacers - would you install the IM coolant bypass if you have snowy winters, like say NY? The guide said not recommended for extremely cold climates.

#34

The cars coolant is just as cold as the rest of the car. So the bypass wont hurt anything. Its not like you start teh car and its already warm.

#35

New intake manifold came in yesterday.

My S6 was extremely well maintained in its 100k mile lifetime, however, they never did the carbon cleaning service, so mine was significantly caked with carbon. Spent 4 hours last night on just cleaning out the carbon and have 7/10 cylinders finished. Going to hopefully have the last three done today and get it all back together.

#36

An explanation for the increase on the top end could have been from cleaning the carbon out while it was apart. Also, with the flaps not actuating properly to begin with, your top end could have been effected by some of the flaps falling into the lower RPM, low end position.

#37

I know I’m reviving a dead thread, but just pulled my intake and found broken pieces and trying to decide on whether I should try a “fix” with the stock intake or buy a new one.

Mine had 4 flaps broken and loose in the intake. Thankfully it doesn’t seem like any of that got into the engine.

I’ll post some pics tonight, but looking for some ideas on what to try… I guess I kinda wanna experiment with what’s possible in this intakes. I guess what I’m wondering is if I just leave the center sections out and put it back together. I need to do some research on how this intake works regardless. Not sure if a huge open plentum would help anything.

#38

Best bet would be to buy the new updated version I think…

#39

I just found the same problem with the arm having broken off from the rod inside the intake.

http://i345.photobucket.com/albums/p394/froggers6/IMG_1988_zpsweavt2mp.jpg

I noticed it when I had the IM off for replacement of the manifold gaskets to resolve some vacuum leaks. This was after discovering some broken flap pieces on top of the valves a couple of months ago after pulling the IM for the oil filter housing gasket replacement. I’m assuming that the flaps have finally locked in place causing the arm to shear off. I might take a crack at pulling the IM apart in the next few months and gluing the flaps in place in the long runner position to maximize torque while waiting for JHM to release a more robust system.

Gratuitous pic of V10 with IM removed from this last weekend.

http://i345.photobucket.com/albums/p394/froggers6/IMG_1981_zpsrj2ayio8.jpg

#40

That sucks but that is probably the best solution until JHM releases there updated intake manifold.

When the flaps are broken like that its best to glue the flaps in the long runner position