Light weight and Noise insulating glass in a 992 - Page 2 - 911/Carrera GT - PistonHeads UK

Has anyone had the car with this option and what are your thoughts!

No, but forget the 4kg weight saving. I’ve lost that much in a couple of weeks by giving up crisps. Suspect the noise improvements are similar ultra marginal gains, and not worth the best part of a grand.

First Sea Lord said: No, but forget the 4kg weight saving. I’ve lost that much in a couple of weeks by giving up crisps. Suspect the noise improvements are similar ultra marginal gains, and not worth the best part of a grand. Yes not all taking notice of the 4kg weight saving. However it’s a noisy car and this glass may refine that noise issue. I know it’s a sports car but lots of reviews complain about the cabin noise and people who had this glass seem to like it. The reviews however are quite vague.

Alas, I really don’t see any fancy glass materially helping with the usual 911 wheel arch tyre roar. I live in a noisy neighbourhood. We had special glazing fitted when replacing the windows at the front. It’s good but am not convinced that it’s more than just a tiny bit better than the normal double glazing we have at the rear. Suspect the very marginal gains approach also applies here.

That's always seemed a bit of a contradictory option to me... I'd see it either as - you want thinner / lighter glass for more noise and a slight weight-saving to make the car more "driver focussed", or, you want better sound insulation to make the car more 'GT' like, and thicker glass or similar is worth the extra bit of weight.. I dunno, feels to me like trying to save a marginal amount of weight and at the same time reduce interior noise doesn't make much sense, especially for close to a thousand pounds!

smithyithy said: That's always seemed a bit of a contradictory option to me... I'd see it either as - you want thinner / lighter glass for more noise and a slight weight-saving to make the car more "driver focussed", or, you want better sound insulation to make the car more 'GT' like, and thicker glass or similar is worth the extra bit of weight.. I dunno, feels to me like trying to save a marginal amount of weight and at the same time reduce interior noise doesn't make much sense, especially for close to a thousand pounds! I think if anyone get this option it would be for noise reduction. No one is that bothered about 4 kg weight benefit. A glass doesn’t have to be thick to be noise efficient though.

Janko Lind on youtube did a video about this - he is a real fan but cannot recall which of his videos mentioned it Personally unless one was very sensitive to noise then I wouldn't bother

Kickstart said: Janko Lind on youtube did a video about this - he is a real fan but cannot recall which of his videos mentioned it Personally unless one was very sensitive to noise then I wouldn't bother I looked at some reviews. Harry got 80db reading in a normal Rd at 50mph. Someone did a decibel reading with NCG and readings are lower. It’s probably worth it. I might go for it

Docmem said: I think if anyone get this option it would be for noise reduction. No one is that bothered about 4 kg weight benefit. A glass doesn’t have to be thick to be noise efficient though. Maybe true.. I was messing about on the configurator earlier and on the Turbo / Turbo S, you can have a 'lightweight package' which included 'lightweight and noise-cancelling glazing' combined with 'reduced insulation', so you have reduced noise in one area and increased noise in another, just seems at odds with itself..

smithyithy said: Docmem said: I think if anyone get this option it would be for noise reduction. No one is that bothered about 4 kg weight benefit. A glass doesn’t have to be thick to be noise efficient though. Maybe true.. I was messing about on the configurator earlier and on the Turbo / Turbo S, you can have a 'lightweight package' which included 'lightweight and noise-cancelling glazing' combined with 'reduced insulation', so you have reduced noise in one area and increased noise in another, just seems at odds with itself.. That’s hilarious

https://newsroom.porsche.com/en/2021/innovation/po... Noise-insulated glass in all windows Porsche installs the noise-insulated glass throughout, including in the tiny triangular panes and, of course, the rear window. A secondary effect is that the acoustic glass weighs a little less than the standard offering. In the case of the Panamera, the reduction in weight is around two kilograms. In addition, the extra layer of film makes the glass more resistant to break-ins. The additional insulation can always be ordered in combination with the thermally insulated glass, which looks no different from the standard glass. The thermally and noise-insulated glass can, of course, also be combined with the ever-popular privacy glass. The lightweight glass option offers comparable noise reduction for two-door models.

I have ordered this on my C4S which is at the factory stuck in production. I have read a vast number of articles on it mainly on Rennlist and seen Janko Linds videos too. The general feeling although intangible is positive as it works to reduce wind and road noise. There were some concerns raised about the fragility of the glass a while back on GT cars which I believe is why Porsche removed the option for quite a few months last year and early this year. Clearly engine, induction and exhaust noise is unaffected as it enters via the tubes into the cabin. I added this to my order after seeing Harry’s video complaining about the amount of general noise. My car will be used for long journeys etc so anything to reduce unnecessary additional noise for me has to be a good thing. Edited by bl0498 on Monday 22 August 12:42

I have added this option to my car this morning. Build date 03/11/22. So will see if it helps. Will feed back.

I considered this option but I also think there were some issue with mobile signal? The wind noise isn't that bad, which when discussed with the OPC was the only slight benefit. But it's the tyre noise in the 992 is far from ideal, the GTS is even worse than the S, only a real issue on long motorway runs on a poor surface, in those cases just boost up the Bose.

The description is a bit misleading, the real benefit is in the extra security (it's effectively laminated glass) and the reduction in road noise. The lightweight aspect is a by-product. Plenty of other cars have it as an option (but without the lightweight element), I have similar on a 6 series BMW. From Porsche: Unlike the conventional single-layer safety glass used for the sides and rear, this glass features five layers: glass, three layers of film, and then glass again. The middle layer of the three polyvinyl butyral (PVB) films has special acoustic properties that absorb much of the oscillation of the surrounding glass. This reduces outside noise by up to 7.3 per cent in a frequency range of 630 hertz to 6.3 kilohertz. “That doesn’t sound like much, but everyone who’s ever tested the difference in driving conditions is impressed,” continues Ochs. It effectively covers the range that the human ear is most sensitive to, which is approximately 3.5 to 4.0 kilohertz. Police, fire engine, and ambulance sirens remain just as loud as always, as they fall within the frequencies between 360 and 630 hertz virtually all over the world.

I have ordered a Carrera 4 GTS which is due in a couple of weeks - after being stuck in production for four months!!! The reason I ordered the glass was to cut down road noise. I had initial concerns about it reducing the engine note, but it was explained to me that as the GTS has reduced behind seat insulation - to let more engine note into the cabin - the effect of the glass should actually be to enhance the engine sound. i.e. because of less drowning out by external noise. I have driven a few GTSs without the glass so will post what happens in practice once I drive it.

I did order the noise insulating glass and got the car in December. It definitely makes the cabin quieter

Like @Docmem I have this on my C4S delivered in November. It does definitely reduce the road noise over the standard glass although I might add extra material on the rear wheel arches as per another thread on here.

Just received my new 992 GTS 4 Coupe with the Noise insulating glass. I am happy to report it works! Road noise is significantly down and the engine note isn't drowned out so much by the tyre roar. Remember on GTS they reduced the back seat insulation so with the glass the cabin fills with relatively more engine note than road. So much so that I occasionally switched off the sports exhaust ! I had previously driven 2 other GTS's without the glass. As for the light weight? - well as others have noted it's not a lot. I suppose it might improve performance by 0.1% ! Def recommend the option.

Will the emergency services be able to easily break the laminated glass and get you out of the car when you’ve barrel rolled it into field?

A company called Sekusui (sp?) S-LEC do acoustic film that can be added afterwards with very good reports on wind and tyre roar reduction. The acoustic glass would be a must have option for me on a new 911, the difference makes all the difference. But the aftermarket stuff is as good if not better.

First Sea Lord said: No, but forget the 4kg weight saving. I’ve lost that much in a couple of weeks by giving up crisps. Suspect the noise improvements are similar ultra marginal gains, and not worth the best part of a grand. it's a similar weight saving to the 911 T though which is marketed at a lightweight edition car

WCZ said: it's a similar weight saving to the 911 T though which is marketed at a lightweight edition car …. And then people tick all the option boxes and it loses its USP.

johnny senna said: Will the emergency services be able to easily break the laminated glass and get you out of the car when you’ve barrel rolled it into field? Yes, they are. No problem. Only when you are trying to escape your car through laminated side windows, it can be more difficult. The benefits far outnumber this single scenario, imho. I would personally always opt for laminated windows if I can. My Volvo V90 T8 has them as standard. And Volvo knows a thing or two about safety

Filibuster said: Yes, they are. No problem. Only when you are trying to escape your car through laminated side windows, it can be more difficult. The benefits far outnumber this single scenario, imho. I would personally always opt for laminated windows if I can. My Volvo V90 T8 has them as standard. And Volvo knows a thing or two about safety The Fire Brigade will cut you out in a crash by opening the door with hydraulic rams or cutting the A/B pillars and roof off, so they can get you into a stretcher, I don't think they usually try to drag people out of the windows. My 6 series also has laminated side glass, it's been an option for many years on many BMW models.