Sound Deadening

[Kestrel]

Originally Posted by Ernest72

2200 rpm going uphill.

Found your problem 🙃



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[Lunatic]

Originally Posted by Ernest72

JDL uel header - Invidia Q300 - plenty of drone at low rpm. Love it when I am on it, but after an hour in the car it starts to wear on you. Just trying to tone it down a little. Some dynamite and ensolite and some acoustic foam should help. Been through this with my 04 WRX at stage 2 with prodrive muffler- it worked for that car.

I also have a header and Q-300. I added the HKS dual resonated front pipe and that helped a lot.

[Ernest72]

Originally Posted by Lunatic

I also have a header and Q-300. I added the HKS dual resonated front pipe and that helped a lot.

thanks, I think that would work, but I want to keep the cat. maybe try the magna flow one. need to do some research.

[Varelco]

Originally Posted by Ernest72

Been trying to quiet down the exhaust note in the car. Took the entire trunk apart and notice a black square on each side. The square has some thin rubber that can move and open to let air in or out and is pretty much exposed to the outside. So exhaust noise can come right in and echo through the trunk. I covered these squares loosely with some ensolite. Anyone else try this. I am in the middle so I have not tested it yet. Plan on getting some more acoustic foam and jam it in there between the square and the side cover for the trunk.

Originally Posted by tshrey

The point of those flaps is evacuating cabin air to draw fresh air in. Plugging them means you don't get the same air flow.

.

The reason those flaps exist is to equalize the air pressure inside the car. If you seal these you are in theory sealing the car (assuming the windows are up). It doesn't help the HVAC pump and circulate air inside the cabin. They also act like a pressure relief when you slam those doors shut. So yeah, don't block them, they are there for a reason, not to mention blocking them will do nothing. Sound isn't like water, it doesn't just seep in through gaps, it vibrates through the entire car.

Your exhaust is resonating at a very low frequency, unless you intend to fill the cabin with masses of material sound deadening will do very little. The 2 solutions you have are to replace the exhaust or have a helmholtz resonator fitted in your exhaust (this will be particularly big for low frequency)

[Ernest72]

Originally Posted by Varelco

The reason those flaps exist is to equalize the air pressure inside the car. If you seal these you are in theory sealing the car (assuming the windows are up). It doesn't help the HVAC pump and circulate air inside the cabin. They also act like a pressure relief when you slam those doors shut. So yeah, don't block them, they are there for a reason, not to mention blocking them will do nothing. Sound isn't like water, it doesn't just seep in through gaps, it vibrates through the entire car.

Your exhaust is resonating at a very low frequency, unless you intend to fill the cabin with masses of material sound deadening will do very little. The 2 solutions you have are to replace the exhaust or have a helmholtz resonator fitted in your exhaust (this will be particularly big for low frequency)

helmholz will be done. I did not seal them just stuck some foam down there. it did nothing. this car is just too tinny.