Quieting 718 Cayman Interior
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I haven't, this is a race car and I love the cabin symphony..........otherwise I would buy a Macan, Cayenne or Panamera. The GT cars are more so with regard to minimal cabin insulation.
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The 18" wheels probably provide better road noise reduction but you may want to balance that concern against the esthetics of an 18" vs a 19" wheel. Frankly, I felt from an esthetic perspective the 20" wheels looked the best but I compromised with the 19" wheel for better ride comfort. Look at some Porsches at the dealership and compare Porsches with different wheel sizes before making a choice. Just a word of caution, changing the wheels after the fact can get costly.
I appreciate the words of wisdom on the wheel size. The 18s may look a bit on the small side, and I'll have to revisit. I read somewhere on here that the engineers think the 18" wheels are the best overall, but they offered larger sizes due to customer demand. I'm not sure what the exact source of that information.
Thank you.
Thank you.
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I have to admit, I was a bit surprised at how much noise there is in the cabin in my Cayman when I first picked it up. The thing that make the biggest difference (to me) are the roads themselves. Some roads are coarser (I think because they are made from recycled millings) and result in more interior noise. Smoother roads really made a difference (I can't really discern road smoothness differences in our Honda but it's obvious in the Cayman). As with P2018, I'm a sports car guy and it doesn't really bother me......all part of the package.
Obviously the wheels themselves are different diameters but the sidewall aspect ratio of 45 (sidewall height) is slightly larger on the 18" (vs. the 40 on the 19" and 35 on the 20").
It's worth noting that Formula 1 cars use tires that have a 45 aspect ratio
Whatever you decide, I agree with our moderator: buy what you want when you order. It will be cheaper and more efficient than buying more wheels later on.
I am told that there are plenty of high performance tires in the 18" and 19" size but selection may be more limited in the 20" size, if that matters to you.
Just a reminder that the outer diameter of the 18" tires is exactly the same at the 19" tires and 20" tires. They "fill" the wheel wells to the same degree. Otherwise, Porsche might have to change the final drive ratio for each different wheel size.
Obviously the wheels themselves are different diameters but the sidewall aspect ratio of 45 (sidewall height) is slightly larger on the 18" (vs. the 40 on the 19" and 35 on the 20").
It's worth noting that Formula 1 cars use tires that have a 45 aspect ratio
Whatever you decide, I agree with our moderator: buy what you want when you order. It will be cheaper and more efficient than buying more wheels later on.
I am told that there are plenty of high performance tires in the 18" and 19" size but selection may be more limited in the 20" size, if that matters to you.
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Not so much, actually, if you're looking for Porsche approved.
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The Boxster may be quieter (with the roof up) than the Cayman and is sure louder with the roof down. It's nice to have the choice.
As far as the wheel size goes, the 18" are the best riding and the 20" are the hardest riding. Ultimate performance differences?--basically irrelevant on public roads. The bigger wheels do suffer more from pot-hole (and similar) damage so may be less desirable if the road surfaces are bad.
As far as the wheel size goes, the 18" are the best riding and the 20" are the hardest riding. Ultimate performance differences?--basically irrelevant on public roads. The bigger wheels do suffer more from pot-hole (and similar) damage so may be less desirable if the road surfaces are bad.
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I have owned both and Boxster is always louder, if you disconnect the dreaded sound aktor Cayman transforms to a luxury saloon, until you use sport/sport+
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OK, so maybe disconnecting the soundaktor is why my Boxster is quiet.
Some places report a lot of tyre/road noise--our roads here all seem quiet when compared with some Canadian/US roads I've driven.
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i had planned on sparingly using dynamat on the interior of my cayman but while it was at my friend's shop one of his guys went a little overboard and coated almost everything from the rear firewall back in a layer. i had already done the inside of the outer door skin and the outside of the inner skin and disconnected the aktor. it is more quite inside now but i don't think it was worth the effort. dynamat is a vibration control product, not a sound blocker. to block sound you need a layer of ccf (closed cell foam) and a layer of mlv (mass loaded vinyl), both with 100% coverage (sound is like water - it will find the path of least resistance).
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24 Posts
Great info! Thank you. I was thinking of going the dynamat route and now will back off. My gts has 20" michellins, which are supposed to be the best for the car. I wonder if another brand may be quieter. I am willing to give back some performance for less noise.
Any opinions on what brand tires are quieter?
Here's a link to Porsche Tyre Approvals on Porsche.com in the U.K. The lists also provide noise emission figures. https://www.porsche.com/uk/accessoriesandservice/porscheservice/vehicleinformation/tyreapproval/
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As someone has already stated, the biggest impact on the interior sound in these cars is the road surface itself. The car is very quiet when travelling on smooth tarmac but unfortunately most our roads seem to be made from coarse stone clippings
I have noticed on other cars I have owned that Pirelli tyres do get noisier once they are part worn which is why I am going to swap to Michelin’s next
Also, the cayman wheel wells are lined with plastic where as our Macan has wheel wells lined with some sort of felt. That is where most of the noise will come from
I have noticed on other cars I have owned that Pirelli tyres do get noisier once they are part worn which is why I am going to swap to Michelin’s next
Also, the cayman wheel wells are lined with plastic where as our Macan has wheel wells lined with some sort of felt. That is where most of the noise will come from
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Completely agree but would like to add a temperature element to this. Both the 20" Michelin summer tyres as well as the 18" Pirelli Sotozero winters produce 72dB of sound according to the link above. What this measurement doesn't make clear is at what temperature this level is measured. From personal experience, the winter set appears much "quieter" than the summer set. I believe it's the compound making the difference at this time of year in the northern hemisphere.
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Based on my experiences with a 981C and 982 C, tire noise can indeed be quite noticeable depending on the road surface. Pirelli P-Zero tires on the 981 and Yokohama Advan Sport V105 tires on the 982, both with 19" wheels. In the chart on the Porsche website referenced above, it appears the Michelin XL Pilot Sport 4 S tires are only available for 20" wheels.
I would disconnect the sound aktor (fuse the trunk), that certainly makes the cabin more enjoyable. (it's like someone moved the engine half a meter further to the back)
Aside from that, if you want more quietness, the best place to start are the wheel arches, no padding on them to dampen the tyre noise.
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