"tyre/road noise dominates over power unit noise for all speeds and gears except when driving on the first gear" PDF: http://www.diva-portal.org/smash/get/diva

"tyre/road noise dominates over power unit noise for all speeds and gears except when driving on the first gear" PDF: http://www.diva-portal.org/smash/get/diva2:673693/FULLTEXT01.pdf http://www.diva-portal.org/smash/get/diva2:673693/FULLTEXT01... Note on reading the graphs - look for the black line labeled "coast by". This is the line with no engine (power unit) noise, which is control for the other colored lines with engine noise.