Performance Roof Box + Thule WingBars = Noise Issues

satchurator

Well-Known Member
Joined
Mar 22, 2021
Threads
30
Messages
346
Reaction score
299
Location
Massachussets, USA
Vehicles
MY22 CT4
Country flag
I purchased the Porsche Performance Roof Box before I received my CT4 (unboxing thread here). After seeing the issues @Swissbob experienced with his OEM roof bars, I decided to get the Thule WingBar Edge 9585B roof bars.

After two winter road trips, I've been experiencing a frustrating noise issue. Its not the wind rush / whistling you would expect from roofbars/boxen, rather its an intense buzzing noise that starts above 65 mph (~105 kph) and gets more intense with increasing speed. It was quite unbearable.

There was no visible shaking, so after double checking the torquing of the clamps and making sure nothing else was loose, I eventually narrowed it down to the front edge 'nose' of the box, where the upper and lower parts of the clamshell come together. It seems as though the airflow is such that its pushing through that front nose junction and causing them to chatter intensely.

Given that the press release for the Performance Roof Box was touting wind tunnel tests at up to 120mph, I'm pretty disappointed. However, I'm inclined to attribute the problem to a combination of the roof box and the Thule WingBars together. The Thule WingBars sit lower than the OEM bars, closer to the panoramic glass surface. Also, where the OEM bars have compensated height such that the PPRB would sit perfectly horizontally, the Thule WingBars are not height compensated. So on top of the WingBars, the PPRB is not perfectly horizontal - its flat underside is at about 3º to the horizontal.

I am very reluctant to switch to the Porsche OEM bars and risk trashing my roof rails. So my low-tech solution is to add three strips of black electrical tape! With three strips of tape at the front, the box is quite silent.

Sharing this as an FYI to other folks who have or are considering this combination of accessories. I'm interested to hear if anybody else is having noise issues with their Porsche Performance Roof Box, regardless of how its mounted.

P.S. Any suggestions on how to easily share an audio clip without creating accounts elsewhere?

MountedTWB - 1.jpeg


MountingPPRBOnTWB - 1.jpeg


SideOfPPRBAndTWB - 1.jpeg


FrontOfPPRB - 1.jpeg

 

thecoloradokid

Well-Known Member
Joined
Jun 17, 2020
Threads
31
Messages
391
Reaction score
758
Location
Colorado
Vehicles
'22 Taycan CT4s
Country flag
Just throwing this out there, but I have seen online that in some cases turning the carrier around with the bigger end facing forward improves efficiency. Maybe it might take care of your noise issue?

Your car looks great in snow, btw.
 

fgwinn

Well-Known Member
Joined
Aug 31, 2021
Threads
31
Messages
297
Reaction score
183
Location
Philadelphia
Vehicles
MY22 FBM CT4
Country flag
The low profile Thule bars look more OEM than the Porsche bars. Have you removed the bars to confirm that they do not damage the rails?

Is the Performance Roof Box secured to the bars with a bolt that slides into the track on the bar? It does not look like there is much clearance between the box and the glass roof.
 
OP
OP
satchurator

satchurator

Well-Known Member
Joined
Mar 22, 2021
Threads
30
Messages
346
Reaction score
299
Location
Massachussets, USA
Vehicles
MY22 CT4
Country flag
The low profile Thule bars look more OEM than the Porsche bars. Have you removed the bars to confirm that they do not damage the rails?

Is the Performance Roof Box secured to the bars with a bolt that slides into the track on the bar? It does not look like there is much clearance between the box and the glass roof.
I have not yet removed the Thule WingBars for the first time, but I am confident there won’t be damage. They attach by a rubber-coated metal collar that loops around the roof rails. Zero metal to metal contact.

Look closely at the images I attached to the first post - the roof box attaches to the roof bars by four adjustable rubberized metal claws - the exact same mechanism as Thule’s boxes (the PPRB is made for Porsche by Thule). After installing there is about 3/4 of an inch (2cm) clearance between the lowest point of the claws to the panoramic roof glass.
 
Last edited:

fgwinn

Well-Known Member
Joined
Aug 31, 2021
Threads
31
Messages
297
Reaction score
183
Location
Philadelphia
Vehicles
MY22 FBM CT4
Country flag
I have not yet removed the Thule WingBars for the first time, but I am confident there won’t be damage. They attach by a rubber-coated metal collar that loops around the roof rails. Zero metal to metal contact.

Look closely at the images I attached to the first post - the roof box attaches to the roof bars by four adjustable rubberized metal claws - the exact same mechanism as Thule’s boxes (the PPRB is made for Porsche by Thule). After installing there is about 3/4 of an inch (2cm) clearance between the lowest point of the claws to the panoramic roof glass.
My concern is that even though the straps are rubber coated, they do not match the angle of the nonparallel rails. It seems to me that the clamping pressure will be concentrated on the front edge of the strap where the distance between the rails is slightly greater.
 


OP
OP
satchurator

satchurator

Well-Known Member
Joined
Mar 22, 2021
Threads
30
Messages
346
Reaction score
299
Location
Massachussets, USA
Vehicles
MY22 CT4
Country flag
My concern is that even though the straps are rubber coated, they do not match the angle of the nonparallel rails. It seems to me that the clamping pressure will be concentrated on the front edge of the strap where the distance between the rails is slightly greater.
We'll see. I shall report back on another thread when I eventually remove the WingBars. There are only so many ways to attach these things. The slotted bolt method would be quite challenging to install, IMO. Older non-Taycan Porsche roofbars have had rubberized clamps. The Porsche OEM Taycan roofbars have bare metal clamps. In the face of this goldilocks paradox, I went with the Thule WingBars.

Appreciate the discussion here, but it would be nice to bring this focus of this thread back to my original objective of discussing noise issues with the PPRB.
 

McgR

Well-Known Member
Joined
Sep 27, 2021
Threads
17
Messages
781
Reaction score
562
Location
Belgium
Vehicles
Taycan CT 4
Country flag
I don’t have my car yet. Hopefully in a couple of weeks. I have also ordered the Thule wingbars but with a Thule Vector M roofbox.

I hope I will be able to put in on the Taycan and that it doesn’t have a conflict with the roof with the low position of the wingbars.
 

 
Vivid Racing
Top