REDUCING EXCESSIVE hGHWY ROAD NOISE ON 911/911s
#16
10-06-2009 | 07:32 AM
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I had some Dynamat "extreme" laying around (and I have never wanted to tear apart the insides to add some of this) so I knocked on the car in a few places like the inner fenders. There is no sound deadening there so I decided to add some. I put some Dynamat on each inner fender closes to the passenger compartment ,on the front lower plastic panel under the steering box, and on the plastic under the transmission. Note; I didn't try to cover every square inch at all.
#18
10-06-2009 | 07:37 AM
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Sorry I din't take any pictures. All the dynamt was put on The inside surfaces of the plastic.
The idea being to absorb or trap the sound before it can be transferred to the passenger compartment. I did not put any on the steel body of the car behind these areas.
The idea being to absorb or trap the sound before it can be transferred to the passenger compartment. I did not put any on the steel body of the car behind these areas.
#19
10-06-2009 | 07:39 AM
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Are the Bridgestones quiet when they are worn out?
#20
10-06-2009 | 09:31 AM
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dndodd - your post reminds me of a similar thing I did to my Alfa GTV when I rebuilt the body 15 years ago. It suffered considerable road noise so when it was on stripped and on the rotisserie I took the time to apply additional underbody protection in and around the rear axle housing. There was none there - I think Luigi had a bad day when it was built in '72!
If the 997 is like that then what you're suggesting makes sense. Some others may not want to add weight but done properly and using the right product there is very little additional weight. I used a water based Glasurit Underbody sealant. In total it would have added maybe a couple of pounds tops.
If the 997 is like that then what you're suggesting makes sense. Some others may not want to add weight but done properly and using the right product there is very little additional weight. I used a water based Glasurit Underbody sealant. In total it would have added maybe a couple of pounds tops.
Last edited by aggie57; 10-06-2009 at 09:37 AM.
#21
10-06-2009 | 11:43 AM
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I had some Dynamat "extreme" laying around (and I have never wanted to tear apart the insides to add some of this) so I knocked on the car in a few places like the inner fenders. There is no sound deadening there so I decided to add some. I put some Dynamat on each inner fender closes to the passenger compartment ,on the front lower plastic panel under the steering box, and on the plastic under the transmission.
#22
10-06-2009 | 11:55 AM
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Some say that N2-filled tires are quieter tires. If there's any truth to that it must be be because N2-filled tires have no moisture. Thus, if tires are filled with dry air they should be just as quiet (or as loud). What do you think?
#23
10-06-2009 | 12:03 PM
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This is bait, right?
I had a PT Barnum flash for a sec...
#24
10-06-2009 | 12:07 PM
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Keep in mind, if highway comfort is a priority, the PDK has another gear - 7th which lowers rpms and engine noise as well as improving gas economy.
Good luck
Last edited by drspeed; 10-06-2009 at 12:10 PM.
#25
10-06-2009 | 12:24 PM
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Since I don't commute in my car I have learned to live with the noise (concrete and expansion joints are the worst). I had PZeros that were pretty worn at one point and had switched to PS2's and there was a minimal reduction in noise. I love every other aspect of the car that the noise is just one of the "quirks" of the car.
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