Quote:
Originally Posted by jsimon7777
You can change the sound of the car in many ways, including at the exhaust and with a tune. Those resonators are more about volume than length, and there are many other factors, like metal thickness and how they're installed, that matter.
More importantly, you need to identify what the sound problem actually is. Is it that the exhaust is rubbing on something? Is it resonating? Is it making sound that is making something else resonate? Adding another exhaust hangar or two could dampen a resonating exhaust by absorbing some of the vibration. Adding a well-located weight to the exhaust could change the frequency of resonance to something that sounds good instead of bothering you, or to something you don't even hear. Sometimes you just need some vibration damping material on a body panel. The resonator you have is one way to deal with the issue, but it's a hard way. You'd need some kind of sliding trombone system to get the tune right, and even then, you might have another frequency that drives you nuts.
It just doesn't seem like you 100% know what the problem is.
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Well I do know what the problem is, Drone!
And yes there are different ways to kill it. Adding a weight is an option but I dont know how to do it properly? Do you know how to calculate how much weight and where? I would love to know so I don't have to open a hole to my exhaust next time and I'm sure its a lot cheaper. Some people heat wrap the entire exhaust with very good results, this add weights and changes the frequency.
I know it's different than a traditional hemholtz resonator but the math and physics behind this method cannot be argued, at least IMHO.
I can't change the thickness of my exhaust without changing the entire setup. This is why choosing your exhaust and researching about it its so important and even after weeks of research you can end up with drone. There are too many variables.
Vibration damping material will not eliminate drone, its like a band aid. This will only reduce what you hear not what it's actually happening. This is the least effective method.
A trombone system would be awesome but in practice its very difficult to achieve and thats why I said that the easiest way to kill the drone is to change your exhaust but for some people this is not an option.
This is a proven method. You will see many success stories on the forums specially guys running supras (4 inch straight exhaust) and mustangs. I did it and now I can live with my car. As I said on the post, this is not for everyone put your stock exhaust back if you don't want any troubles.
We could argue all day about what is the most effective way of doing it. I did it this way and worked pretty good. Take this a grain of salt, I will encourage all forum members to read more about this topic but I believe this is a good start.