Cabin noise

psibrr

read the whole thread, long as it was. thx for all the prose and pics.
might try the rubber matting ritual ..

haven't had problem with tire noise per se, the 19's are 12 lbs ea. lighter than the 18's on the 350, so expected higher frequency road resonance. i like the feedback, can tell difference between yellow and white paint, which is useful.

seen too many references to 60mph levels. btw, dealers only test to 70, so my issue not addressable by them, which is more triple digit.

my 08 350e mt cruised fine at 135, no bassy drone. but 370/sp is droning w/ horrible booming from 90 up.. starts getting loud @95, and just increases, 130sounds like one is inside a fully loaded 4 prop b-52 bomber. maybe tires are main culprit.

wonder if hatch < the door that's raised with the window in it> could be packed inside with dynamat stuff, along with trunk surfacing?

once, maybe 3 decades back, read in a car mag that the ticking heard in the jag sedan was courtesy of 500 lbs of wool. today we have rubber with air cells etc. so 20 lbs or so for acoustic control isn't much in comparison even if it doesn't get the tick tock.

with xtra 20HP from straight H exhaust one could use up to 190 lbs of acoustic insulation, and keep same weight / power ratio as with stock zero; 500 lbs would require 380hp