z3mcoupe

Howdy all,

I've done a few searches on rattles on the 997.2 cars, and I've a 2009 C4S with 52k miles. It is pretty much rattle free until I hit rough pavement/freeways.

The car has Hankook V12Evos (which I don't really like) but the car had these installed when I bought the car because it needed new tires.

On certain surfaces, I get a resonance from the dash on both the drivers and passenger side which drives me nuts. I am going to have a friend drive the car and try and ID the source.

The question I have is, has anyone else experience with rattles/resonance differences with running different tires?

Do the OE tires (Michein PS2) which are considerably much more expensive minimize rattles, or improve the NVH? Thanks!

Bijan

Mine is a 2009 also with Continental tires but don't seem to have your issues. Assume you have the recommended pressures.

nzskater

I get occasional rattles/noise at different times from:
Dash wart
Rear view mirror
Dial cluster
Wing mirror control
Sunroof

It got 50% worse after installing semi solid engine mounts. It's not enough to switch back to OEM!

Going from RE050A's to MPSS reduced it a little I think?

OKB

you dont say how many miles are on the tires. If they are worn out it may make differences. The brand wont make any difference you can feel. Look at the pressure.

z3mcoupe

Thanks for the reply everyone . I forgot to mention that am running the fronts at 34 and the rears 37 (while the car is cold).

The tires were installed about 6k miles ago but appear to have decent thread left on them. Having said that it could also be a function of tire wear as I'm sure these are possibly past their 50% lifespan.

I will hunt around later today and see if I can resolve any of them.

OKB

No explination for the problem, but I would try 36-38 in all 4. I also think that all 911 with big wheels and tires make alot of road noise. I put sound deadening material in my car and it makes a real difference ( fro any other 911 you ride in)

awrryan

Sorry to change the subject, but where exactly did you install sound deadening
Material? I'm interested in doing the same

david

Ronan, my experience with rattles (in non-Porsches) is that there will always be a semblance of a rattle, regardless of the road condition.

If you are experiencing a resonance, I suspect that the tires are the culprit.

Has it become more noticeable as the tread has worn?

I'm running MPSS tires and the rears have 20k with ~2k left in them. While road noise has increased during the tires lifespan, there are no rattles/resonance that is being transmitted to the body.

It looks like a road trip to the Eastern Sierra is coming together during the next couple of weeks: perhaps you can join and we can properly identify the issue?!

ADias

NEVER fill all tires in a 911 at the same PSI. You need at least a 4PSI diff R-F.

OKB

I keep 38 in all 4, and you can add sound deadening (many different kinds, try ebay) pull up the carpet and stick it to every surface you can access, mainly take all the back seat and carpets out and cover that whole area. Really cuts the sound by about 1/2 and quiets the interior

ADias

Same pressure on all 4 tires in a 911 is just wrong, unless you always drive very slow.

Of course you are free to do as you like. I post my observation here for the benefit of others who care about safety.

Hella-Buggin'

What? Please do not do this. You are over inflating your front tires and reducing grip once they heat up.