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I just installed the new foam-insulated tires today. First impression: EXCELLENT! Yesterday, with my old 19" Michelin Primacy MXM4 with only 2/32 tread depth, the tire noise was clearly the loudest source of noise when I was driving highway speeds. Today, with the new foam-insulated 19" Michelin Primacy MXM4 tires, the car is so much quieter that the rear motor (I do not have the "D") is the loudest source of noise when I am driving highway speeds.
Perhaps I should point out that it will take quite a while to have a good understanding of the effects of the foam treatment.
Several issues I've thought of:
1) Tire life. Will the foam heat the tires and drastically reduce the tire life? Or, conversely, will it improve tire life by reducing vibration? It will take months, possibly almost two years, before I'll have the results of just testing 1 set of tires!
2) Life of the noise reduction. Will the excellent results I've experienced last? Or, as the tires age, will the foam break down & stop working? Worse yet, if bits of foam break loose, I could actually experience an increase in noise!
3) Range reduction. I'm positive there will be some negative impact on range. With time, I should have a fair idea of the added energy consumption levels, but I've not done the careful measuring needed to get a true picture.
Weight, and possible air convections inside the tire, might cause range reduction. Especially if I do a lot of stop-and-go travel. I doubt there will be much difference if I travel at a steady speed....3) What makes you expect a range reduction? Certainly not weight; isn't the stuff only about 16oz? Did it feel stiff enough that you think it might interfere with flexing of the tread? But Conti tests say that there is no change in performance, so it couldn't affect flexing..
What I would be more concerned about would be what happens if you should have a flat tire. How badly would the foam be damaged? How would that affect repair of a puncture?
Slime would probably be bad with the foam, would be much harder to clean out for a full repair (would probably still work, but the tire would likely be irreparable after that)I do carry a tire repair kit, as well as a tire slime kit, in my car. So far, in almost two years, I have not needed to repair a tire. My last car, however, I needed to repair a tire almost every half year!
Slime would probably be bad with the foam, would be much harder to clean out for a full repair (would probably still work, but the tire would likely be irreparable after that)
As for the patch kit, I see no reason that would change.
Excited about this thread, thank you for all the hard work. I wonder why no other high end autos who pride themselves on having the quietest cabin haven't pushed for this earlier from tire companies. It seems pretty intuitive and I would imagine that heat resilient acoustic foam has probably been around for awhile.
...makes me wonder if we just need a proper high-temp adhesive and about 10 tire-wide strips of Dynaliner (or similar acoustic foam) to DIY this. I must be missing something as it can't be that simple......?
-m
Excited about this thread, thank you for all the hard work. I wonder why no other high end autos who pride themselves on having the quietest cabin haven't pushed for this earlier from tire companies. It seems pretty intuitive and I would imagine that heat resilient acoustic foam has probably been around for awhile.
I've thought about this question and what I've concluded is that this solution is most appropriate for an electric car. Even quieter ICE's generate considerable engine, gear, transmission, etc noise under power surges. A Tesla has almost none of that so the road noise becomes a much bigger issue at all speeds, torque, motor speed levels. The tire foam business will grow as electric car sales grow.
Woot! Go artsci, go! And thank you for the explanations. On a side note, I think its just incredible that such a ground-breaking car such as the MS could help potentially create a new sub-industry, acoustic dampening tires. It's just so fascinating to me.If Recticel won't provide kits to us I may develop my own....
I never minded it until it became the only thing I hear. Tesla's are just so frickin' quiet otherwise... :biggrin:Subscribed. I don't mind my road noise very much, but I'm really excited to see how this turns out!
Subscribed. I don't mind my road noise very much, but I'm really excited to see how this turns out!
I never minded it until it became the only thing I hear. Tesla's are just so frickin' quiet otherwise... :biggrin:
This, plus the fact that in traditional ICEs, the tire noise would likely get drowned out by the engine noise many times. As such, its a better "value" to do more soundproofing for all outside noises vs. muffling tire noise. So their efforts have been focused more on quieting the cabin from the exterior versus tackling specific factors of the exterior.