I know this topic has been brought up countless times before, but i want to sound deaden my car so that it doesn't have so much road noise coming through.

I just got some 17's put on and the road noise has increased somewhat from before and i really don't like it.

Therefore my question to all teh knowledgable folk in CAA land is:

What deadening method would reduce road noise coming into the cabin i.e. sound deadening the floors, doors, roof?

Any advice would be appreciated.
BTW my doors are being sound deadened on thursday when i am getting some focal polyglass 165v2's installed. Will this help?

what type of tyres did you get with the 17's? im betting theyre directional tread pattern
first thing i'd be looking at is sound deadening the gaurds, both the inside of the gaurds (metal) and both sides of the splash gaurds (plastic bit). if im right in what ive assumed, then paint on deadener is the best to use here, maybe if ur doing ur doors you'll have some left over stick-on based stuff so use that on the metal part of the gaurds, and then paint over it too. once all 4 gaurds are done, give it a day or so to try (if its painted) and go for a drive, you'll spot the difference

unlike doors and some panels, you won't necessarily need self-adhesive aluminium-backed SDer. that stuff is great for sticking to vertical panels of course plus adding weight and dissipating resonance as heat.

however, for roadnoise, you can get away with less-expensive (usually) non-adhesive stuff that's not aluminium-backed.

stuff like felt or rubber underlay are useful. they will act as a barrier rather than as weight. clark rubber may have something suitable, or else car upholsterers, carpet stores, etc.

for commercial incar products, look at regular dynamat, or G-spot serenity.

for good results, you'll need to remove the carpets and attack under there. it'll be a bit of an undertaking, but worth it. behind the dash is usually impractical. do the boot if you can, and wheel arches as GMH mentioned (will need self-adhesive here to keep it there). doing all the doors will be helpful too.

good luck

I used underlay stuff on the floor, it was a material similar to the stock sound absorbing felt used in most cars but has a heavy layer of bitumen in between.
on the vertical edges, where the felt mats ran short, I stuck some dynamat premium



my wheel arches have two coats of supercrap sound deadener, cant confirm if this stuff actually works that well, but its great underbody protection if nothing else.

and I got some foam insulation under the hood, to replace the stock commodore sound insulation thingy, which sorta crumbles after two years

i'm willing to bet the tyres you've got are falkens. good rubbers but a lot of road noise at speeds on some of their tyres especially the older range.

can you change them for softer compound tyres that are less noisy? i personally love the f1s. they perform exceptionally and are softer (ride as well as noise) at speeds