Warwick Morris

Ladies and gentlemen. I have a 997.1 TT which I use as a daily driver and for "spirited" country touring in Australia. I've had it for a 18 months and have had various tyres on it. The tyre roar is quite intrusive at speed (as it was on a 997S I had some years ago) and is much worse than on a 996 C2 I had in the the early noughties (I also have a 2000 996.1 GT3 for club sports use and it's so noisy I can't even hear the tyres!).

Has anyone out there had a go at a fix for this issue (the new 991 appears to has solved the problem)? By his I mean spaying under guard treatment on or applying some other sound deadening inside the wheel arches. My experience is that tyre choice has only very marginal effect and it's a basic design/construction issue.

Warwick

speed21

Yes the tyre roar on course bitumen is bad. On smooth bitumen it is ok but thats about it. I think doing long trips would be a bit tiresome and frankly there are better cars to use for those applications. I recall a member over on 6speedonline under the user name car narcissist (or something like that) who posted a thread on how he dealt with the issue using sound deadening material on the inside of the car. It required all the trim to be stripped out so was not an easy job but he did report later that it was a worthwhile exercise for what he wanted. Maybe do a search over there and PM him. Cheers.

Warwick Morris

Thanks. I won't be stripping the interior. It's mainly a city driver with occasional fast country road work. Will have to stay with noise-cancelling ear buds and Spotify on the phone for the longer trips.

speed21

Yes well I feel for you because I've been in the same boat on the coarse chip blacktop trying to have a phone conversation. Not fun.

Rogor

You might think this is crazy but I know that Alfa Romeo fitted in the 156 the wheel arches a kind of carpet to dampen the wheel/road noise. It seemed to help.
But I would not want that on a 200 mph car.... What could go wrong when it comes under a wheel when breaking.
If you want to know more I can try to look it up for you.

See also other solution on classic Porsche http://www.lokari.nl/

Boeing 717

I always wondered if it would help if you could stick some dynamat on the backside of the plastic wheel well liners.

http://www.eastwood.com/dynamat-extreme-wedge-pack.html

ilko

These cars have really wide low profile tires. Noise is par for the course. Especially as the tread wears down.

Rogor

No, I just got an answer for a Alfa Romeo 156 driver who told me they use a kind of felt material. With synthetic plugs it is fixed inside the wheel arches.

Igooz

In my hotrods and Pro-touring cars we have used the Dynamat material. They make great sound absorption material that absorbs both radiated noise such as tire noise radiated into the vehicle as well as conducted noise such as through suspension and mounts. But the challenge is that you have to apply the material on the metal surfaces such as floors, wheels wells, inside doors, etc and under the carpeting.

http://www.dynamat.com/

I have used it in bare metal resto-rod such as '55 Chevy with a 632 or a '32 3W Ford with a Flattie,..never in a sophisticated car such as a 997TT.

As ILKO said, worn tires tend to cause a lot more "ugly" tire noise...but if you really want "ugly" tire noise in a 997 the GT2 is really bad!!!

"Haaaaaaaaah? What did you say...."

bill8411

Good thread!

Acknowledging that the Michelin's seem to be the popular tire of the moment,,,

Are there other hi performance brands that are quieter than they are?

TIA!

Boeing 717

Maybe, but according to tirerack surveys the michelins come out on top for least noisy.