Please Help Me Reduce Cabin Noise On Fox Body

black beard · Mar 11, 2017

ok guys i got this car for a hobby project and it is too loud in the cabin to enjoy the ride. My goal is to be able to take my wife and kids for rides without crazy cabin noise. Heres what the car has for mods:gt40 heads, b cam, 70 mil throttle cool air intake msd mack shorty headers 2 1/2 flowmasters front to back (with H) to connect them together with 3 1/2 tips. not sure which mufflers are on it. i do know the insulation sound barrier has been removed and it is sitting on ridgid engine mounts.its lowered 2 1/2 inches and is sitting on 17 inch rims. I would like to make this car as user friendly as possible any suggestions guys!!!! thanks

Deleted member 215073 · Mar 11, 2017

Urethane motor mounts, insulate the interior with underfloor batting or Dynamat type product, put quieter exhaust on it. You could also make sure all your weatherstripping is in good shape.

General karthief · Mar 11, 2017

I would suggest regular engine/trans mounts, 2 1/2 mandrel bent tail pipes. Mufflers I'm not sure about, talk to a couple manufacturers about sound, I know some have a sound that you can hear there choices on line.
You can install sound suppression insulation on the floors, it requires removing the interior.

black beard · Mar 11, 2017

Thanks guys, definitely plan on doing the sound deadening procedure.

black beard · Mar 11, 2017

JMGlasgow said:
Urethane motor mounts, insulate the interior with underfloor batting or Dynamat type product, put quieter exhaust on it. You could also make sure all your weatherstripping is in good shape.

Would the urethane motor be an issue with my mods? apparently previous owner put solid mounts do to twist

General karthief · Mar 11, 2017

Any subframe connectors?

black beard · Mar 11, 2017

karthief said:
Any subframe connectors?

Negative

Deleted member 215073 · Mar 11, 2017

I would think they would be fine. Even regular rubber mounts should work.

I would also make subframe connectors a priority.

black beard · Mar 11, 2017

JMGlasgow said:
I would think they would be fine. Even regular rubber mounts should work.

I would also make subframe connectors a priority.

Thank you for the reply

CarMichael Angelo · Mar 12, 2017

It all depends on how the transmission is mounted. If the transmission is solidly mounted, then rubber mounts on the engine ( or anything that allows the engine to rock even slightly) will be a death nail to the transmission case.

Solid mounts will transmit an enormous amount of harmonics to the chassis. Vibrations from the engine will be felt.

A larger diameter exhaust is noisier, the lack of a sound deadening barrier between the firewall, and floor will allow noise, and heat to transfer into the interior. Carpet and padding will help, but not be as effective as if there were a "dynamat" like material installed first.

But all of this is mute if what is under your car for an exhaust is typical for most mustangs...

The typical hack mod is to get rid of the cats, and throw on a set of flow masters. Losing the cats increases the tailpipe emissions, and creates the infamous " I smell like exhaust when I drive/ ride in my car" syndrome.
The flow master muffler is just a noisy ass metal box w/ a couple of diverters welded inside.

Reinstall the cats, get an alternative aftermarket muffler. That alone will lower the noise level more than anything else you can do......the power gain from a flow master muffler over a quieter muffler is soo minimal,..it's not worth yelling at each other just to go for a drive, or smelling like a tail pipe when you do.

black beard · Mar 12, 2017

madmike1157 said:
It all depends on how the transmission is mounted. If the transmission is solidly mounted, then rubber mounts on the engine ( or anything that allows the engine to rock even slightly) will be a death nail to the transmission case.

Solid mounts will transmit an enormous amount of harmonics to the chassis. Vibrations from the engine will be felt.

A larger diameter exhaust is noisier, the lack of a sound deadening barrier between the firewall, and floor will allow noise, and heat to transfer into the interior. Carpet and padding will help, but not be as effective as if there were a "dynamat" like material installed first.

But all of this is mute if what is under your car for an exhaust is typical for most mustangs...

The typical hack mod is to get rid of the cats, and throw on a set of flow masters. Losing the cats increases the tailpipe emissions, and creates the infamous " I smell like exhaust when I drive/ ride in my car" syndrome.
The flow master muffler is just a noisy ass metal box w/ a couple of diverters welded inside.

Reinstall the cats, get an alternative aftermarket muffler. That alone will lower the noise level more than anything else you can do......the power gain from a flow master muffler over a quieter muffler is soo minimal,..it's not worth yelling at each other just to go for a drive, or smelling like a tail pipe when you do.

Great advice, is there anyway of checking visually if trans is rubber mounted or solid?

CarMichael Angelo · Mar 12, 2017

black beard said:
Great advice, is there anyway of checking visually if trans is rubber mounted or solid?

You'll be able to see the rubber pad that the mount is sandwiched with.

General karthief · Mar 12, 2017

Go to lmr.com select trans mount for your car and it shows pics of both

black beard · Mar 12, 2017

it has rubber mounted bracket.

black beard · Mar 12, 2017

madmike1157 said:
It all depends on how the transmission is mounted. If the transmission is solidly mounted, then rubber mounts on the engine ( or anything that allows the engine to rock even slightly) will be a death nail to the transmission case.

Solid mounts will transmit an enormous amount of harmonics to the chassis. Vibrations from the engine will be felt.

A larger diameter exhaust is noisier, the lack of a sound deadening barrier between the firewall, and floor will allow noise, and heat to transfer into the interior. Carpet and padding will help, but not be as effective as if there were a "dynamat" like material installed first.

But all of this is mute if what is under your car for an exhaust is typical for most mustangs...

The typical hack mod is to get rid of the cats, and throw on a set of flow masters. Losing the cats increases the tailpipe emissions, and creates the infamous " I smell like exhaust when I drive/ ride in my car" syndrome.
The flow master muffler is just a noisy ass metal box w/ a couple of diverters welded inside.

Reinstall the cats, get an alternative aftermarket muffler. That alone will lower the noise level more than anything else you can do......the power gain from a flow master muffler over a quieter muffler is soo minimal,..it's not worth yelling at each other just to go for a drive, or smelling like a tail pipe when you do.

keeping a budget in mind as i just bought the car you thing the engine mounts is a good place to start.

Bossed · Mar 12, 2017

Our 92 SSP coupe was a noisy mess when I bought it. I installed Fatmat and Insulation from Carinsulation.com, to the roof, doors, floor, and trunk. The improvement was totally worth it.

Mustang5L5 · Mar 12, 2017

Bossed said:
Our 92 SSP coupe was a noisy mess when I bought it. I installed Fatmat and Insulation from Carinsulation.com, to the roof, doors, floor, and trunk. The improvement was totally worth it.

This is my next project when I run out of projects

Dan02gt · Mar 12, 2017

The 2.5" drop isn't helping you either. It must ride like a tractor. Changing the springs to something that would give you a 1.25"-1.5" drop would make a big difference in ride quality.

black beard · Mar 12, 2017

im looking online and im not seeing rubber mounted engine mounts for a

Dan02gt said:
The 2.5" drop isn't helping you either. It must ride like a tractor. Changing the springs to something that would give you a 1.25"-1.5" drop would make a big difference in ride quality.

it is very stiff and doesnt handle bumps well. looks sick though lol

black beard · Mar 12, 2017

Bossed said:
Our 92 SSP coupe was a noisy mess when I bought it. I installed Fatmat and Insulation from Carinsulation.com, to the roof, doors, floor, and trunk. The improvement was totally worth it.

doing alot of research on sound deading and they recomend a cdl tile over 25% of material (adds weight and reduces vibrations) followed by ccf (closed cell foam) over the tile to act as a buffer or gasket followed by mlv high density foam which is the true sound deadener

Please Help Me Reduce Cabin Noise On Fox Body

black beard

Deleted member 215073

General karthief

wonder how much it would cost to ship you a pair

black beard

black beard

General karthief

wonder how much it would cost to ship you a pair

black beard

Deleted member 215073

black beard

CarMichael Angelo

my rearend will smell so minty fresh,

black beard

CarMichael Angelo

my rearend will smell so minty fresh,

General karthief

wonder how much it would cost to ship you a pair

black beard

black beard

Bossed

Well-Known Member

Mustang5L5

That is…until I whipped out my Bissell

Dan02gt

mazing how much gas smell came from that tiny hole

black beard

black beard

Similar threads

Please Help Me Reduce Cabin Noise On Fox Body

Deleted member 215073

wonder how much it would cost to ship you a pair

wonder how much it would cost to ship you a pair

Deleted member 215073

my rearend will smell so minty fresh,

my rearend will smell so minty fresh,

wonder how much it would cost to ship you a pair

Well-Known Member

That is…until I whipped out my Bissell

mazing how much gas smell came from that tiny hole

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