I've noticed this recently with the every changing Texas whether. Never noticed it before with the stock exhaust. Why does my exhaust tone change with the weather. Seems to be much deeper and throatier when it get warmer outside?

 

Metal expands when it is heated, so on a hot day your exhaust has a larger diameter. Just kidding, I doubt it. I have noticed this on my V8 Grand Cherokee with Flowmaster exhaust. I'm wondering if it has to do with the heat of the engine, or the heat of the exhaust. To narrow it down, somebody needs to disconnect their exhaust, let their engine warm up, then connect the exhaust to see if it still has the "cold exhaust note" :lol: Any volunteers?
I'll stop talking out of my butt now.

 

if you notice it more when its warmer, i would think that its gotta be something with the air. when the air heats up, it will be less dense (remembering back from high school physics). and so the sound waves might be able to travel through the air better. other feedback might explain better.

 

mine is louder when its colder (say, in the 50's) In fact, I found at 52, the exhaust rattles everything, at 53, its not as bad.. Don't know how 1 degree makes the difference, but it does. When its warm/hot outside, I hear no rattles or anything else from the exhaust.. jsut the exhaust (gotta love elims :thumbs: )

 

You hit it right on the head... I is all to do with air density and humidity. Although if my memory serves be correctly mine is louder when it is cold out.

Soon to come!
True Duals, X-pipe, 40 series Flows! :cheers:

 

My exhaust is definitely louder when it's cold outside.

 

Your vette looks great.....as far as the sound's...??????????????
If weather is cold...maybe????????????
Beyond me.....
tony
:flag

 

You guys are off track on this one. It is actually your ears that hear differently at different temperatures. Having a Ph'd in Earology I can prove this. Go sit in your vette and hold an ice cube to each ear then notice how the sound changes as your ears warm up. I usually drive around with a bucket of ice cubes and really like the way my Vette sounds with cold ears.

 

:withstupid:

:lolg: :lolg: :lolg: :lolg:

Ear muffs have a tendency to change exhaust tone, also.

 

:lol: :lol: :lol:

 

Air/fuel ratio, and air density changes IMO.

:chevy

 

I am not sure why it seems louder to you when it is warmer outside. Usually the exhaust sound becomes louder (and deeper) as it gets colder. The way I understand it:

When the air temperature drops, the air becomes denser. The molecules in the air become less "excited" and slow down in travel (velocity) through the air. This causes more molecules to be located within a certain area (AKA increase in air pressure). Then your exhaust creates a sound wave, the wave colides with these molecules and causes a chain reaction by vibrating these molecules to the exhaust's frequency. These molecules then distribute the frequency to any other molecule that comes in contact with it. Your ear, and more importantly your ear drum, vibrates to the same frequency as the air molecules. Since there are more molecules at a higher pressure, your ear drum feels the amplification of the molecules in greater numbers and you hear a louder sound.

To describe why it is deeper, the sound is more "pure" because the molecules retain the original sound wave's frequency by traveling a shorter (rather than longer distance when the air is warm and the molecules are excited) distance to pass on the original frequency to another molecule. The original low frequency is retained rather than expended through wasteful particle motion. In warm air, the molecules must travel farther to vibrate other molecules. By this time, many of the particles either lose the original frequency or change the frequency to a higher (not a low "growl") or lower (lower = beyond the human ear capability) frequency. Remember, it takes energy to move and object, and sound is energy!

This also explains why exhaust sounds are louder and deeper at a cold start versus a warm operation. The air in the exhaust system is cold, but becomes warm and hot (when sound quality is at its lowest) during operation.

Hope this helps...There will be a test tomorrow.

Take Care! :flag

 

Yup, same reason your stereo sounds much better sometimes.

AM radio is also affected by this.


[Modified by ConeKLR, 2:24 PM 4/9/2003]

 

Here is what I can tell you from a tuning perspective, when your car is running richer, it has a deeper mellower (sp?) sound, when I start getting the AFR to where it needs to be the sound is louder and less hollow/deep sounding.

So recapping deep is rich and leaner is louder/less hollow.

You could actually be running richer is some temperatures as there are many fuel maps that relate to temperature.

:cheers:

 

Humidity from water in the exhaust system. Cold days, more condensation in the system.

 

You guys blew it on this one! The reason your car sounds louder in the summer(or when it's warmer) is because YOU OPENED YOUR WINDOW!

:lolg: :lol: :lolg: :lol:

cold air, dense air, more power, more noise.