Is the dreadfully loud road noise (sounds like front tires) typical of all G35 coupes around 30mph or so?


I test drove 6 before buying mine a month ago, and it seemed present in all.. only the one I did finally purchase seems to be getting louder and louder.

 

yah the G has a lot of road noise...but not bad for rolling on 19s. But yah you definately have a lot of road noise with the G. Depends on tires you have too.

 

depends on tires and alignment but Gs have a fair bit of road noise. you can help reduce it by using dynamat. hope this helps.

 

B-Quiet Ultimate -- http://www.B-Quiet.com/

 

Anybody have any ideas on the most effective location to stop the road noise from the front. The back of the car is pretty quiet, IMO. It's just the road noise from the front tires that seems so obnoxious. I can hardly hear the OEM exhaust note with the windows up (at any speed), so the rear seems fine. Unfortunately, the rear would be the easiest to Dynamat.

It seems like the tire noise up front is making it right past the firewall or floorboards/toe-boards with such ease.

 

Yes, about 2-3 decibels down. Remove plastic inlay of the front wheel and place some deadenning material into the area behind the fender, towards door hinges. This is a very effective resonance space. I bough for about 15$ an insulation wrapped in plastic at Home Depot, cut about 2-3 sq feet and wrapped it additionally with a garbage plastic bag. After squeezing this in... it's like heaven. And cheap.

 

You're talking about removing the plastic wheel-well/fender liner, accessing it from the wheel-well, correct?

I've got a good amount of Dynamat Extreme remaining from a previous project, it's just a matter of finding the best location for it. Sounds like a great spot that's also hidden from view. I'll try that.

 

How about a little more detail? I am very unfamiliar with removing and replacing the plastic inlay. If you could describe where you put the stuff a little better, that would help. Also, if you know -- is the inlay you are talking about the same one you remove to replace the fog lights? Your help is appreciated.

 

I think he's talking about behind the wheel, behind that fender liner.

I agree, some clarification would be great, as well as any other locations that people have had luck with.

 

I did it few months ago, so I'll try to reconstruct what i did.
1. remove front wheel (car lifted)
2. wheel well has 2 plastic inlays: front and rear; remove rear one (few plastic clips and 3 screws - 2 on the fender's edge and one at the bottom)
3. you will see a "chamber" between a fender and the car body

............_______
.______/....|..... \_____
/ O \__|___|____/ O \_|
....../\........... /\....../\
......|............ |.......|
I hope this helps. This "chamber" is about "hand" wide. Do not put dynamat there - it's a waste. You need to "fill" it up with something that is light and flexible. Any fiberglass insulation will do. You can use dynamat on the "invisible"part of the inlay - towards the car inside.
4. put it back together.

If interested, I did similar work filling resonance chambers behind rear fenders. This one is a bit harder and consust of 2 steps: 1 a chamber accessible from the trunk - remove existsting foam and put fiberglas insulation which fits better all uneven surfaces; and step 2. remove rear seat (bottom) and side panels; you will find a nice chamber near speakers (need to remove it too).
This significantly reduced muffler noise heard from inside - outside rumble is still there.

I'll post some pictures later

 

AWESOME, please post pics. I'll be doing the front and the back seat/trunk as well. My wife complains she hears 2 much muffler in the back seat. When i slapped the sat reciever in, i did see alot of dead space in the trunk liner/ behind back seats and below speakers.
When you say foam, its that soft squishy stuff? or the hard stuff lining the bottom of the trunk?
Thanks,
K

 

https://g35driver.com/forums/showthr...ound+deadening

check the above link for a thread on sound deadening the G......it has pics for the rear of the car, but none for the front wheel wells......hope this helps!

 

Some pictures I have....First one - front floor under carpet - driver side

Insulation I used to fill gaps

Engine hood

Trunk insulated with dynamat - full view

Trunk - fender side

 

More pictures

Trunk - left side. An arrow shows where insulation should go

Trunk - right side

 

I'm thinking about putting some dynomatt under the hood too. Did that help with the engine noise much or only a little bit? So far I have dynomatted the back seats and the trunk and I can barely hear the exaust, but there is still a lot of engine noise.