I've been working on my Panamera on and off over the past couple of weeks, which I'll share in another thread I plan on starting.

Today though I wanted to bolt on the IPD plenum I had purchased.

I found it wasn't so straight forward. In fact I could not make it work with my car. I had to reinstall the original Y pipe. Worse still I had disconnected the elbow below the Y pipe and I'm worried I have introduced a leak now.

What I discovered is there is a difference between USA vs ROW parts for the Y pipe. The US part is "7PP 145 770" while the EUR part is "970 110 140 71". From above these two parts look identical. They differ on the bottom where the US part has two vent outlets which connect into a breather junction. The EUR Y pipe has an elbow instead which connects directly into a vent hose.

While trying to figure this out I disconnected the elbow from the Y pipe. It didn't break or snap off, however when I tried to reattach the elbow it felt loose, like it wasn't sealed anymore.

I'm now left wondering what to do with this with expensive aftermarket part. I need to connect the vent hose to the outlet on the bottom of the IPD plenum but I have no idea what fitting to use.

If I can find the part number for the breather junction I can attach it to the plenum and the vent hose. However the junction is supposed to be connected to another vent line which does not exist in my car (hence why it doesn't have a junction). Although in the IPD install you are supposed to block this off

Looking for any advice from someone who has done this in their own car, I've included some pictures to explain what I mean.


Y pipe with elbow removed

IPD plenum with different sized outlet

Vent hose with elbow still connected

 

Re-watching a few IPD plenum installs for Panamera and 958 Cayenne has helped a lot to understand how I can move forwards with this issue.

On US Panamera/Cayenne Turbos they both have a breather line which connects immediately to the right of the plenum. The IPD plenum kit has a plug to block it off on the junction. Apparently this line does nothing anyway.

On EUR Panamera Turbo, this line does not exist and where it would connect to is already blocked off.

So what I need to do is order the junction part, remove the elbow from the vacuum hose and plug the vacuum hose into the red port. Then install the plenum as normal.

My only issue now is locating this part for the Panamera.

 

FYI - metal builds heat better and holds it for longer than plastic, so that plenum will actually warm up the air MORE, and keep it warmer for longer than the OEM plastic one. Looks cool, though.

 

the 970.2 Turbo S has a metal plenum as well...

 

I managed to track down the right part number and ordered it. Was a bit of a gamble because all the descriptions for this part are basically useless, it is listed under names like "Plug", "vent hose". Took a few weeks to get to me but once it arrived I checked the part would fit as expected.

Then it was a matter of removing the old plenum and old elbow off the hose and fitting everything together. I replaced the old hose clamp with a new worm drive clamp and I also sawed off the vent hose, on the new part, that is normally blocked off when installing the IPD plenum.

It is a bit of a mystery to me why US cars use this breather junction, that has a vent hose connected which does nothing. After installing it I went for a 750km trip and I believe the product has either made a difference or I had a leak which it has fixed.

Hopefully this post will help someone else out in the future.


US breather junction part


The finished install

 

Thanks for updating with the solution!

 

Have one sitting in a box now... what does the "butt dyno" tell you?

 

My experience of the new plenum is it is making a difference. The way the plenum is designed is more like the plenum in the Turbo S pictured above, with a much sharper curve where it joins in the middle. The inside of the plenum is not smooth like the plastic one but has golf ball like dimples and we all know that these dimples allow better airflow.

Whether it is worth the price is another matter. I got mine for a slight discount but after shipping and taxes it ended up being quite an expensive mod. It isn't snake oil but its just really expensive for the benefits it provides.

In hindsight I probably would not do this mod again but disconnecting the elbow from the plastic plenum probably introduced a boost leak and I felt I needed to complete the mod in order to fix this issue.

 

So I put the ipd plenum on my 2012 turbo s the other day and the the clips were already broken off the dual fitting hose with the one red side that goes to the ipd and you put the plug in the black one. Seems to be fine so far but what exactly does the red plug go to and what problems can it coming loose cause?

 

The red plug is the vacuum line. I’m not a mechanic so I don’t know what else it affects if it is unplugged but you will introduce a boost leak at the very least because the plenum is force fed by the turbos. My understanding is if it comes off completely the sensor will not work correctly either.

 

hey quick question where did you buy this hose ? I can’t find it nowhere

 

I ordered it from Pelican. It is a US specific part.

 

Thank you for your thread! This has troubled me ever since I ordered my IPD as I'm trying to solve a P0299 Fault code (underboost). My car is a China Version Panamera Turbo which is in exactly the same situation as yours, all I have is an elbow and nowhere to put the blocker IPD gave me. I do have one question: Since you order the US Version junction, if that redundant vent line does not exist, where did you connect that US version vent line to? Specifically this part in the picture:


THANK YOU SO MUCH!

 

Nothing, I cut the hose off

 

My bad I missed the part where you said you sawed it off, Did you have to do anything else? or nothing because that blocker does the job? Thank you!