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Not sure if this has been brought up before but I wanted to share my experience of pull drop at higher rpms.
I noticed that the engine would not rev as freely as it used to. I could feel a noticeable drop in pull at full throttle, pretty much exactly at 6700-6800rpms on mine. Best noticeable in 4th.
The connecting rubber intake hose is compressing too much at higher rpms, thus restricting the air flow.
Quickly fixed by my dealer by installing new part.
I have no idea, whether this is Touring specific or not but if you are not overly insensitive, you should notice.
Last edited by NA6speed; 09-16-2022 at 05:15 PM.
Reason: better description
Dundon gets my vote. I have their carbon intake installed on my RS and all I can say is it is top quality. I know this is not the same kit as what is needed for the touring but the science and quality of parts is the same. It does make a difference over the upper RPM range of the motor. The car with teh kit pulls harder especially in the 7500-9000 RPM range. The only downside to this kit is the intake is hidden fully by the carbon engine cover supplied by Porsche with the car.
We're talking about part number 991 110 270 90 - "intake manifold" from Porsche v-pages spare parts catalogue. My source says the parts number is 991 110 270 91 but I can't find this one in the catalogue. It's the equivalent part, though.
There is a known irregularity of material of said manifold which leads to the part contracting and restricing the air flow, hence there is a new part number available.
If I understand correctly, the improved replacement's part number is 991 110 270 84.
Did you get this replaced under warranty? If so, how? I think i have the same issue but my dealer said no codes and no safe place for a tech to get to that RPM.
No warranty for me. The car is 4.5 years, has seen plenty of mileage, and lots of track days, so I did not expect warranty tbh. Didn't cost that much either, so all good from my end.
There is an official documentaton of this issue, though.
AFAIK Touring has a different airbox, but I am not sure about the part in question here and as I mentioned in my first post I am also not sure if this issue is Touring specific.
Just a quick follow-up on this.
The installation of the new part has improved behaviour, but only slightly. The "dent" in acceleration is less prominent, but still there.
Noticeable, because acceleration from speeds greater 250km/h is very chewy and top is now reached at 290km/h. Lacking 25-30km/h top speed suggest a power down of somewhat around 50hp.
Normally the car pulled strong, even beyond 300km/h the speedometer would climb steadily and fairly quick up to over 320.
Now suspecting the swirl valve actuator, as others have already experienced.
We shall soon see...
I had the Dundon intake installed on my car and the tech found that the lower center control flap arm came loose from the flap. So, the flap wasn't doing anything. It was reconnected during the install for the intake and now it's back to normal. I'm curious if your issue is the same.
I had forgotten to write a follow up in this.
We found the issue and it was what you and I suspected, only that mine was broken, and not just disconnected.
For everyone who is interested in what it looks like and what it does:
How is the Dundon plenum holding up to so far?
I am also interested about their plenum, but I was told by a company who has quite some experience with Porsche engines (and who also knows this Dundon part), that this Dundon plenum might not be a very good idea if you track your car hard, particularly on tracks with long straights (e.g Döttinger Höhe with almost a minute of full send).
Now what one can clearly see is that the Dundon plenum is a 3D printed piece. I have asked Dundon about the material they use and they say that it is PA12 Nylon and that this was the same material as the original plenum. You can see my question and their answer on the Dundon website.
I have strong reasons to doubt their reply, because when I received back my orginal defective plenum, this surely did not look like PA12. When trying to find out more, I found a clue, which suggests, that the original material on my plenum is PA6-GF30.
These two materials do have quite some significantly different thermal properties - including melting points - and I am just wondering why I am getting information from Dundon, which does not seem to really match to my own findings.
I had forgotten to write a follow up in this.
We found the issue and it was what you and I suspected, only that mine was broken, and not just disconnected.
For everyone who is interested in what it looks like and what it does:
How is the Dundon plenum holding up to so far?
I am also interested about their plenum, but I was told by a company who has quite some experience with Porsche engines (and who also knows this Dundon part), that this Dundon plenum might not be a very good idea if you track your car hard, particularly on tracks with long straights (e.g Döttinger Höhe with almost a minute of full send).
Now what one can clearly see is that the Dundon plenum is a 3D printed piece. I have asked Dundon about the material they use and they say that it is PA12 Nylon and that this was the same material as the original plenum. You can see my question and their answer on the Dundon website.
I have strong reasons to doubt their reply, because when I received back my orginal defective plenum, this surely did not look like PA12. When trying to find out more, I found a clue, which suggests, that the original material on my plenum is PA6-GF30.
These two materials do have quite some significantly different thermal properties - including melting points - and I am just wondering why I am getting information from Dundon, which does not seem to really match to my own findings.
@Ascetic Any long term and demanding track day experiences with these DDUNDON intake parts? See my last post...
09-16-2022 | 04:59 PM
991.2 Touring - Pull reduced over 6700rpm
