Hello14

Hello good people. I’m deciding between a base model and a Carerra 4S - both 992s. Can anyone please comment on weather (1) there is less cabin noise in a 4S vs a base Carerra mode (without noise insulated glass in either model) and (2) whether the drive is smoother in a 4S vs a base model. I drove a 4S on a street at normal speeds and it felt smoother than a T I drove, but also this could be a result of the noise insulated glass that was on the 4S. Thank you.

qwertya

Are you referring specifically to cabin noise or the more generic sense of "smoothness"?

FWIW, 992 T has the "lightweight and noise insulated glass" as a standard option. On S / 4S it is optional. T has reduced sound deadening as well. So comparing a 992 T to a 4S with lightweight glass, theoretically you should be hearing more cabin noises in the T, although I haven't personally drove the two back to back.

There could be other factors at play here, e.g. tire brand used which I suspect could be the most likely culprit, or whether the 4S has the -10mm SPASM option (T has it standard), etc.

PSPorsche

​​​A softer ride is more comfortable, and this may be perceived by passengers as a quieter cabin.

• Some people opt for the base Carrera because it has higher profile tires as standard, and these will definitely contribute to a softer ride.
• Also, I think the base does not come with the S-PASP (the sport suspension, which is 10mm lower, as mentioned above). The standard suspension, 10mm higher, contributes to a softer ride.

As mentioned, tires significantly contribute to noise in the cabin. The brand and tread life make a big difference. Newer tires are quieter.

Please note, Porsche’s “noise insulated glass” is a marketing misnomer. People have reported that cars with this option are actually louder than cars with the standard glass.

3uros

Cabin noise in a 992 4S is the same as the C2 (base) but like others have said, tire OEM makes a slight difference too.

Flash992

Whatever else it may be, Porsche’s thermal and noise insulating glass is not a marketing misnomer. Measurements support the noise reduction claim. See https://newsroom.porsche.com/en/2021...401-26834.html

Motorin Mark

Agreed. I had one without and one with the Noise Insulating Glass and the 992 with the noise insulating glass is definitely quieter inside the cabin. Same Michelin's were on both cars and same options (seats, headliner, radio's etc) inside.These are both 992 "S" cars I am referring to.

drcollie

Ambient Cabin Noise comes from the wheel wells, not the glass. Remove the rear seats and side panels, apply Dynamat everywhere you can and button it back up....or buy a different car.

InfiniteSmiles

There's also a setting for comfort tire pressure, which reduces road noise once the corresponding pressures are applied.

But I guess a 911 may not be for you if cabin noise is of any concern. It's a sports car, not a limo.

PSPorsche

I’m glad you posted this. Some videos I have watched claimed that the noise insulated glass was actually louder than the traditional glass. These were subjective driver impressions comparing a test car with another one from memory. I always wondered if there was actual test data showing the difference.

Also, is do suspect that, as someone pointed out, noise from wheel wells and tires probably drowns out any noise being transmitted through the glass.

981KMAN

WOW, a 0.073 reduction in "outside noise". That's like nothing, and not worth the expense in my view. Plus the article states its only for "four door Porsche models".... So the article does not apply to the 911 series.

It's a marketing gimmick for the most part, as much of the cabin noise does not come through the glass. Plus more information on issues in this thread. I stayed away from it on my 2024 C2S.

Res Ips

Both models to me sound the same on a smooth flat road. They have different spec tires and the S may be a bit more loud in twisties when you're on it...but to me they sound basically the same.

I've spent a lot of time driving P cars over the years. I don't find them overly noisy. In fact, I like the way they sound, that's just what they are.

Seriously though, if you think they are noisy then maybe get something like a Buick or a golf cart inspired Tesla. Both very quiet cars.