My Custom Exhaust...

R

Robbyrotten

Member
Location
Texas
Okay, well I have a custom exhaust now on my FX45. It looks great IMO, but WAY too loud for my taste. I also have two Helmholts resonators I have yet to add to it. I am not sure if I want to add the resonators, and/or add other sound deadening items - or just sell the damn thing - I am leaning towards selling now, because it made me ralize how much I really enjoyed the OEM silence, and sound of the engine.


So, here are some pics and a video for you guys to check out. It is not for everyone, and definately not for me loll

IMAG1367.jpg

IMAG1364.jpg

https://www.youtube.com/watch?v=9wFtfqwq3k0
 

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Video fixed! Stupid photobucket!! - Loaded to youtube! - I will get another from the out side - I am getting my stock exhaust put back on soon, I am very displeased honestly.
 
david said:
Couldn't see video. Is there a muffler at all?
Click to expand...
If you're on , you can view the video.
When you're on desktop, click the last photo (it's actually a video).. that's the thing with Photobucket vid uploads.
 
Wow, I think the exhaust sounds really good, but it's very loud. Add the resonators on for sure. I think that will help a lot with the sound. Nice video. Gotta put the shades on before you drive, lol.

[video=youtube;9wFtfqwq3k0]https://www.youtube.com/watch?v=9wFtfqwq3k0[/video]
 
I am having this inner conflict right now - One part of me says "Dude, just have the helmholtz welded up, and if need be add some sort of muffler to the end area" and the other part says "Forget it, money has been wasted, waste no more and sell!!"
 
Robbyrotten said:
I am having this inner conflict right now - One part of me says "Dude, just have the helmholtz welded up, and if need be add some sort of muffler to the end area" and the other part says "Forget it, money has been wasted, waste no more and sell!!"
Click to expand...

The location and size of the helmholtz is critical for achieving a desired result. Its not rocket science, but it does take some minor calculations.

If you like the tone and not the volume, the easy solution is to add a couple full size mufflers near the end of the system.

SfmDRuT2
 
tchuck said:
The location and size of the helmholtz is critical for achieving a desired result. Its not rocket science, but it does take some minor calculations.

If you like the tone and not the volume, the easy solution is to add a couple full size mufflers near the end of the system.

SfmDRuT2
Click to expand...

Most exhaust systems utilizing the helmholtz put them towards the end of the system... But I am unsure where they should go with NO muffler section toward the end, or maybe the same spot they are supposed to go had my exhaust been one WITH muffler... ? No?
 
Robbyrotten said:
Most exhaust systems utilizing the helmholtz put them towards the end of the system... But I am unsure where they should go with NO muffler section toward the end, or maybe the same spot they are supposed to go had my exhaust been one WITH muffler... ? No?
Click to expand...

The location of the muffler makes no difference.

The calculation is based on reducing specific frequencies. For instance, if you listen to your exhaust note and recognize a particularly loud mid range, you might record it and analyze it in terms of frequency with a visual eq. That analysis would show you that, at 4000rpm your exhaust note is twice as loud at 1500Hz as it is at 1000 or 2000Hz. Considering pressure waves always travel at the same speed (the speed of sound), you could calculate how far away from the sound source a particular division of that frequency would lie, then you would place your resonator there to reduce that frequency coupling, thus reducing the volume at that frequency.

I've literally had 7 beers tonight, so if this doesn't make sense Ill revise it tomorrow.

SfmDRuT2
 
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