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-   -   Mopar crossbars and bike rack wind noise (http://www.jeepgarage.org/f156/mopar-crossbars-and-bike-rack-wind-noise-23147.html)

voyagerx 05-12-2011 08:13 PM

Mopar crossbars and bike rack wind noise
 
Tonight I installed the Mopar crossbars and 2 mopar/thule 517 bike racks. After getting them on and going for a test drive, there is very loud wind noise/howling at 45 and above. Unfortunately, I didn't drive around after installing just the crossbars to see if there was any noise with just them. I did follow the other threads and made sure they were installed correctly. Mine were labeled the right way as well.

The Mopar/Thule 517 bike racks use the T slot to mount to the bar - this meant I couldn't put the rubber strip on the crossbars or else the bolt wouldn't slide in. Could this be part of the wind issue? What other purposes does this rubber strip serve? I tend to leave my bike rack on year round, would it make sense to cut the rubber strip and place it on the crossbar around the bike racks?

Finally, I'm thinking about getting a Thule Wind Fairing - does anyone know if these will fit the Mopar bars?

moosehead 05-12-2011 08:27 PM

Re: Mopar crossbars and bike rack wind noise
 
Yes, the rubber grommet needs to be cut to fit around your rack and go back into the slot to cut down on noise. Otherwise, it's like blowing across the top of a beer bottle.

+1 to the Yak or Thule fairing as well for noise reduction, they are the only way to cut back on both rack and gear wind noise and resistance.
You may need to rig up a mount to the OEM bars, someone here did so and posted photos, just can't remember where.

J13ntv 05-12-2011 08:39 PM

Re: Mopar crossbars and bike rack wind noise
 
I just installed my Thule Aero Bars, and Thule rapid podiums. I also bought a Thule Fairing. I bought a 44 inch and its too wide, therefore the plastic attachments on the fairing hit the rails and make noise. I took the fairing off and don't hear any whistle, or unusual noise coming from the roof with the vent open, sun roof open, sun roof closed etc So I think I may return the fairing. I also prefer the look of no fairing. With a fairing you also have to slide the front bar back more to not interfere with the sun roof. With the stock rails that doesn't leave much of a gap between the front and rear crossbars.

I don't know how people run a 44 inch fairing it goes over the stock rails. I guess a 38 would work better for stock rails, or I could take off the plastic side "wings" on the thule 44inch fairing which would make it smaller and probably fit but as mentioned I don't seem to have a wind issue at the moment (knock on wood) and prefer no fairing look.

Heres a picture of the fairing to reference the plastic wings I talk of:

http://thule.com/~/media/Products/Cl...08&thn=1&w=618

Bull03 05-12-2011 09:23 PM

Re: Mopar crossbars and bike rack wind noise
 
After doing some research on the most aerodynamic racks, I am waiting for Whispbar to bring a solution for the 2011 JGC to market.

Their solution offers the best MPG and the least amount of wind noise.

Unfortunately... I have sent two inquiries regarding an ETA and have not gotten a reply. Perhaps if more inquire, their development will be expedited.

Watch the video Hear the difference... on the right side of the site.

http://www.whispbar.com/
http://www.whispbar.com/about/thelab

J13ntv 05-12-2011 09:35 PM

Re: Mopar crossbars and bike rack wind noise
 
Quote:

Originally Posted by Bull03 (Post 414036)
After doing some research on the most aerodynamic racks, I am waiting for Whispbar to bring a solution for the 2011 JGC to market.

Their solution offers the best MPG and the least amount of wind noise.

Unfortunately... I have sent two inquiries regarding an ETA and have not gotten a reply. Perhaps if more inquire, their development will be expedited.

Watch the video Hear the difference... on the right side of the site.

http://www.whispbar.com/
http://www.whispbar.com/about/thelab

Very similar in design to the Thule Aero bars too... According to that wind machine though the whispbar is quite.. But I'd like to see third party testing, obviously they could have reduced the fan on the machine.. :lol:

voyagerx 05-13-2011 11:23 AM

Re: Mopar crossbars and bike rack wind noise
 
Thanks everyone. I will try to put the rubber in around the rack, and if that doesn't working, I will report back and look for a fairing.

Bull03 05-14-2011 08:08 AM

Re: Mopar crossbars and bike rack wind noise
 
Quote:

Originally Posted by J13ntv (Post 414042)
Very similar in design to the Thule Aero bars too... According to that wind machine though the whispbar is quite.. But I'd like to see third party testing, obviously they could have reduced the fan on the machine.. :lol:

Testing for impact on MPG was conducted at the University of Canterbury 2010

voyagerx 05-14-2011 12:33 PM

I took off the bike racks and did a test drive with and without the rubber strip. Moosehead was right, without the rubber strip it sounded loud; with the strip, it was negligible. I then cut the strips around the bike rack and reinstalled everything. It barely made any more noise with the bike racks then without, so problem solved for now and no wind fairing needed. Now I'll wait to test my ski rack in the winter.


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