Sorry to hijack this thread a bit coz i am in a dilemma to identify whether it is due to insufficient insulation (axia E)/too thin panels/tyre noise (silverstones synergy m3)
initially i tried running on a diff set of tyres ecopias but still the noise intruded.
Lately i hv tried do a bit of soundproofing on the floor but still the noise is still there even at low speeds 30 40 kmh.

It becomes worse when i crosses rough roads. Really tak boleh tahan.

can someone guide me where to start?

I can't differrntiate whether it is tyre noise or road roar.

This post has been edited by eniltoh: May 1 2015, 07:58 AM

Actually most of the low end car suffer road roar problem. From what u said, road roar is a low frequency vibration noise caused by contact of tyre with the road, that noise frequency range is around 100-300Hz. Based on my own experience and judgement, this noise is caused by few factors. 1st, a hard tyre. Change to soft tyre u will immediately feel ur car is more airy, but tyre won't last long, after 10k the tyre become harden and the noise will come back again. The main contributor of this noise is due to bad suspension design. The suspension is not isolated well from the chassis and just can't absorb those tiny bump of the rough road, causing the vibration of the tyre transmit through the strut to chassis, and then causing ur whole chassis (floor, roof, door panel) to vibrate and resonant at the same frequency. This noise is annoying, it will kill ur ICE midbass sound, and kill ur ear in long run (highway drive). Basically u can't solve this problem by changing suspension, and will become worsen when u change ur rim to larger size(hence thinner side wall) and spring/absorber to sport type. The only way u can do is using mass to dampen the chassis vibration, where u can apply thick dampening sheet like STP gold to the whole floor panel. However the main problem of that is ur Axia adi a underpower car, adding mass will make it more worse in terms of power and fuel consumption.

One way to cut down the noise on low end cars is polyurethane foam all the hollow sections like chasis and suspension arms.
It does work well.

Thanks for sharing.coolkwc