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Thoughts on TR Exhaust/Muffler Options

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glemon

glemon

Yoda
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I have installed a dual pipe/dual muffler system in my TR250, it is louder than I had hoped, there is not much available to replace the mufflers I fitted, they are fairly compact, and also fairly loud, it looks like it would be pretty easy to draft in a couple glasspacks into the system.

My quesiton, is there a good chance the glasspacks in conjunction with the fitted mufflers. I know several cars use dual muffler systems to get the right tone (TR4a dual pope system, later big healey for example).

My main goal is quieter, will adding a 2nd muffler, the glass pack will go in front of the muffler if it matters, always make things quieter? usually? or maybe there is more science or at least trial and error to it matching resonances/frequencies etc?
 
I don't know a thing about acoustics or sound resonance but what I would do is to buy a couple of "cherry bombs" or similar (they are relatively cheap) and clamp them onto the ends of my tailpipes. If the sound pleases, put them permanently into the system. If you doesn't, you're out a few bucks and you've got a couple of spare glasspacks. Of course, this assumes that the glasspacks go aft of the mufflers although my baseless opinion is that it won't really matter where they go.
Tom
 
My opinion, adding a glasspack will always make it at least somewhat quieter. In fact, my Stags have dual glasspacks (only) and the exhaust note suits me very well. I had a single glasspack on the previous TR3A and it was somewhat too loud (although adding a downturned tip helped a lot), so I had two of them installed in series on the TR3, and it sounds great. (Two glasspacks in series was actually the factory system as well.)

The main disadvantage of the glasspacks is that the fiberglass frequently falls out before the shell rots away. Without the fiberglass, they do nothing to reduce noise and may even increase it.
 
I added a couple 12" tube type mufflers, not glass packs, but looks like one on the outside, had to fettle around a bit to get it all to fit, sounds great, still has a sporting tone, but not too loud, as it was before, when I took my wife for a ride (before the modification with the extra mufflers) and we couldn't talk without yelling at each other decided it was too loud.

Thanks for the advice, turned out well.
 
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