not to bust anyone's bubble on this thread, but the only reason ur get this "humming" noise is not because of struts or springs or tire size or anything even close in that area, but because of tire/rubber softness, thats it, simple as that.

-the harder the rubber the more noise and slower wear down
-the softer the rubber the less noise the faster wear down
-temp plays a lot too

there are MANY diffrent tires out there in softness rubber so do ur resurch be fore you buy!

thats it good luck

 

I agree. It's the tire. Get a different tire.

 

In my bubble sedan, after I swap suspension with stiffer springs while I had the stock 17" rims w/tires with 380 thread wear (pretty hard rubber), I heard almost no noise but I could "feel" something that was not there with stock suspension. After I switch to 19" with softer tires that had 260 or less thread wear = noise. So what I have experienced contradict what your are stating.

 

Welcome to the world of inner tire feathering. It happens when you lower these cars. Search my handle and the word feathering for why it happens and how fo fix it.

 

Also, I have noticed the directional tires are more noisy that non-directional. Definitely having your camber and caster into spec will help.

 

Correct. However, camber really has nothing to do with this. It's toe. Ways to combat this wear and noise problem.

1) Don't run directional tires
2) Set toe to maximum toe-in (0.16" total)
3) Cross-rotate the front tires every 2000 to 3000miles.
4) Wider tires and rims make the problem worse

My G has the same problem and doing these 4 fixes has happened the address the problem significantly.

 

directional tires on the wrong side ?

 

OK guys I appreciate all the info, I guess for now I'll just rock these loud nitto's untill I find another set for a decent price.

 

Bridgestone RE760... not exactly the cheapest but they aren't that much more than Direzzas, FK452, etc... and you get much more quiet and comfort from them. Next one down on my list would be Direzzas, and that's as cheap as I would go... I don't feel Falkens or Nittos are worth the money at all on a dd.

 

The compound of the tire plays a small role in the tire noise. The noise comes from the air that goes THRU the tread grooves. so if you want a quiet tire buy a tire with smaller tread grooves and more sipes.

 

Tires are acoustically tuned [the tread depth andblock size and shape] to cancel some of the road noise as tires wear to half tread most of the special tuning is GONE.
Depending on the price you pay tires start getting noisey at 5k > 15-20k miles.

Usually ultra premium Michelins are the quitest for a given tread wear.