Anyone else struggling with the Turbo S engine noise?
#18
I wish people would quit confusing the two. I am not complaining about tire noise.
I opened up the engine compartment and blocked the sound symposer tube coming off the intake manifold. You don't need to take much off in order to access the engine compartment - just the airbox and the cover.
See the white tube below? That is the sound symposer tube. The black tube just above it contains the valve which opens for sport mode. The view you see here is after I disconnec ted the black tube from the white one. I cut a thin dress sock into a long strip, rolled it up, and inserted it into the white tube, then reconnected the back hose.
Here is the view from the passenger compartment. This is the other end of the white tube I taped this over with heavy rubber tape.
On the passenger side.
The results from this experiment seem to show a reduced drone intensity but it is not entirely gone. So now I suspect there is another, second sound symposer tube or equivalent in the car. But I don't know where that would be. Thoughts?
#19
Let me say that this is an obviously a boomy engine drone, not tire noise. First, it happens at 2000-2500 rpm, in every gear, at part throttle. It is not dependent on speed, which tire noise would be. Furthermore, it is totally obvious that the sound increases in intensity simply by changing the sport **** on the steering wheel from N to S. That all by itself should explain that this is not a tire issue.
I wish people would quit confusing the two. I am not complaining about tire noise.
I opened up the engine compartment and blocked the sound symposer tube coming off the intake manifold. You don't need to take much off in order to access the engine compartment - just the airbox and the cover.
See the white tube below? That is the sound symposer tube. The black tube just above it contains the valve which opens for sport mode. The view you see here is after I disconnec ted the black tube from the white one. I cut a thin dress sock into a long strip, rolled it up, and inserted it into the white tube, then reconnected the back hose.
Here is the view from the passenger compartment. This is the other end of the white tube I taped this over with heavy rubber tape.
On the passenger side.
The results from this experiment seem to show a reduced drone intensity but it is not entirely gone. So now I suspect there is another, second sound symposer tube or equivalent in the car. But I don't know where that would be. Thoughts?
I wish people would quit confusing the two. I am not complaining about tire noise.
I opened up the engine compartment and blocked the sound symposer tube coming off the intake manifold. You don't need to take much off in order to access the engine compartment - just the airbox and the cover.
See the white tube below? That is the sound symposer tube. The black tube just above it contains the valve which opens for sport mode. The view you see here is after I disconnec ted the black tube from the white one. I cut a thin dress sock into a long strip, rolled it up, and inserted it into the white tube, then reconnected the back hose.
Here is the view from the passenger compartment. This is the other end of the white tube I taped this over with heavy rubber tape.
On the passenger side.
The results from this experiment seem to show a reduced drone intensity but it is not entirely gone. So now I suspect there is another, second sound symposer tube or equivalent in the car. But I don't know where that would be. Thoughts?
#20
Let me say that this is an obviously a boomy engine drone, not tire noise. First, it happens at 2000-2500 rpm, in every gear, at part throttle. It is not dependent on speed, which tire noise would be. Furthermore, it is totally obvious that the sound increases in intensity simply by changing the sport **** on the steering wheel from N to S. That all by itself should explain that this is not a tire issue.
I wish people would quit confusing the two. I am not complaining about tire noise.
I opened up the engine compartment and blocked the sound symposer tube coming off the intake manifold. You don't need to take much off in order to access the engine compartment - just the airbox and the cover.
See the white tube below? That is the sound symposer tube. The black tube just above it contains the valve which opens for sport mode. The view you see here is after I disconnec ted the black tube from the white one. I cut a thin dress sock into a long strip, rolled it up, and inserted it into the white tube, then reconnected the back hose.
Here is the view from the passenger compartment. This is the other end of the white tube I taped this over with heavy rubber tape.
On the passenger side.
The results from this experiment seem to show a reduced drone intensity but it is not entirely gone. So now I suspect there is another, second sound symposer tube or equivalent in the car. But I don't know where that would be. Thoughts?
I wish people would quit confusing the two. I am not complaining about tire noise.
I opened up the engine compartment and blocked the sound symposer tube coming off the intake manifold. You don't need to take much off in order to access the engine compartment - just the airbox and the cover.
See the white tube below? That is the sound symposer tube. The black tube just above it contains the valve which opens for sport mode. The view you see here is after I disconnec ted the black tube from the white one. I cut a thin dress sock into a long strip, rolled it up, and inserted it into the white tube, then reconnected the back hose.
Here is the view from the passenger compartment. This is the other end of the white tube I taped this over with heavy rubber tape.
On the passenger side.
The results from this experiment seem to show a reduced drone intensity but it is not entirely gone. So now I suspect there is another, second sound symposer tube or equivalent in the car. But I don't know where that would be. Thoughts?
#21
Rennlist Member
Join Date: Jan 2013
Location: West Vancouver and San Francisco
Posts: 4,282
Received 1,265 Likes
on
616 Posts
My '18 Turbo S droned from 2400 to 3000 RPM stock. I got an aftermarket exhaust, and there is still drone in the same rev range. Blocking off the sympozer helped a little. My GT3 with the same body but a completely different engine drones in the same rev renage, even though its exhaust has flaps that automatically close in that rev range (even in loud exhaust mode). All this tells me that this is a resonance frequency of the 991 body or something like that.
#22
Rennlist Member
I think it's worth having checked at the dealer. Maybe you have something causing the drone, exhaust least, symposer etc....Don't settle get it checked. What you are experiencing is not the usual normal experience had by others.
#23
I will get it checked but I wonder about your claim that my experience is not usual. There are 5 posts in this thread by 5 others who have exactly this same problem.
#26
My 2015 Turbo S does not have the sound tube, however when I drove my car on highways as you describe and at similar speeds , the drone was really annoying.
I changed exhaust to Tubi and its not as bad, but not gone.
Have owned many other performance cars and not experienced this. I currently own a Huracan and no drone but crusing at 70-80 mph, it feels like it needs another gear.
I think the Italian cars like the high rev.
Mike
I changed exhaust to Tubi and its not as bad, but not gone.
Have owned many other performance cars and not experienced this. I currently own a Huracan and no drone but crusing at 70-80 mph, it feels like it needs another gear.
I think the Italian cars like the high rev.
Mike
#27
My 2015 Turbo S does not have the sound tube, however when I drove my car on highways as you describe and at similar speeds , the drone was really annoying.
I changed exhaust to Tubi and its not as bad, but not gone.
Have owned many other performance cars and not experienced this. I currently own a Huracan and no drone but crusing at 70-80 mph, it feels like it needs another gear.
I think the Italian cars like the high rev.
Mike
I changed exhaust to Tubi and its not as bad, but not gone.
Have owned many other performance cars and not experienced this. I currently own a Huracan and no drone but crusing at 70-80 mph, it feels like it needs another gear.
I think the Italian cars like the high rev.
Mike
This thread is turning out to be real useful thread...thanks for showing how the sound tube works....please post how you fixed the second sound tube if there is one.
Finally, Like Mike I have a Huracan as well, and the sound is glorious, but Mike, I have never had the need for another gear, what gear is the car in at 60-80mph? Perhaps drive in manual sport mode or Strada auto mode can fix that.
#28
Rennlist Member
I have a 2015 TTS and I agree there is an "unpleasant audio frequency" in 7th gear at cruising speed. I just assumed it was part of the Porsche 911 experience since this is my first one. I usually drive in 6th gear to avoid it. It was present with both stock and aftermarket exhaust.
#29
Found this older posting about the same issue
Seems like this has been an issue on some cars at least for years:
https://rennlist.com/forums/991-turb...l#post12146600
Anyone know if TerryO is still around? I PMed him asking who he used for service but no response yet.
https://rennlist.com/forums/991-turb...l#post12146600
Anyone know if TerryO is still around? I PMed him asking who he used for service but no response yet.
#30
Rennlist Member
Originally Posted by catpat8000
I will get it checked but I wonder about your claim that my experience is not usual. There are 5 posts in this thread by 5 others who have exactly this same problem.