No-drone exhaust solution quieter than stock
#46
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Join Date: Oct 2006
Location: The Last Sorta Free State in the US
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B-Quiet Composites (Barriers, Not Dampeners)
B-Quiet Vcomp:
Cost PSF (40.5 SF+ order): $4.07
Weight: 1 lb / SF
Thickness: 0.375 in (9.525 mm)
Frequency (Hz) & Associated TL (transmission loss in dB):
0125 - 15
0250 - 17
0500 - 21
1000 - 28
2000 - 34
4000 - 37
B-Quiet Lcomp (OUT OF PRODUCTION):
Cost PSF (40.5 SF+ order): $9.50 (!)
Weight: 1 lb / SF
Thickness: 0.500 in (12.7 mm)
Frequency (Hz) & Associated TL (transmission loss in dB):
0125 - 17
0250 - 21
0500 - 24
1000 - 32
2000 - 34
4000 - 36
Cost PSF (40.5 SF+ order): $4.07
Weight: 1 lb / SF
Thickness: 0.375 in (9.525 mm)
Frequency (Hz) & Associated TL (transmission loss in dB):
0125 - 15
0250 - 17
0500 - 21
1000 - 28
2000 - 34
4000 - 37
B-Quiet Lcomp (OUT OF PRODUCTION):
Cost PSF (40.5 SF+ order): $9.50 (!)
Weight: 1 lb / SF
Thickness: 0.500 in (12.7 mm)
Frequency (Hz) & Associated TL (transmission loss in dB):
0125 - 17
0250 - 21
0500 - 24
1000 - 32
2000 - 34
4000 - 36
#47
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The people who are trolling are giving the best advice. An Evo will never make you happy if those are the qualities you value in a car. Just wait until the rattles start and you will go mad.
#48
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I also have a minivan with 2 child seats in it and bikes, etc., and thus I am quite immune to rattles at this point... The drone is really my primary issue with the car -- I am quite willing to forgive everything else for its unique strengths.
#49
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"Drone" or what the OP is calling "sub-sonic" (Yes that's the right term, lower than 20hz and the human ear can't hear it, but still gives you a headache) is a problem with the resonant frequencies of the exhaust gasses+the exhaust tubing itself.
Resonance is sound waves being in phase with each other and amplifying each other at a certain frequency.
You can have an extremely quiet exhaust with lots of drone and it will give you a headache.
You can have a very loud exhaust and have 0 drone/resonance and it would be fine for the passengers.
To the OP,
I replied to your other post already, but you can have a free flowing performance exhaust and just get rid of the resonant frequencies that create droning by tuning the resonance out with a different or additional resonator inline.
Resonance is sound waves being in phase with each other and amplifying each other at a certain frequency.
You can have an extremely quiet exhaust with lots of drone and it will give you a headache.
You can have a very loud exhaust and have 0 drone/resonance and it would be fine for the passengers.
To the OP,
I replied to your other post already, but you can have a free flowing performance exhaust and just get rid of the resonant frequencies that create droning by tuning the resonance out with a different or additional resonator inline.
#50
Evolved Member
iTrader: (18)
Resonance is sound waves being in phase with each other and amplifying each other at a certain frequency.
B-Quiet Vcomp:
Cost PSF (40.5 SF+ order): $4.07
Weight: 1 lb / SF
Thickness: 0.375 in (9.525 mm)
Frequency (Hz) & Associated TL (transmission loss in dB):
0125 - 15
0250 - 17
0500 - 21
1000 - 28
2000 - 34
4000 - 37
B-Quiet Lcomp (OUT OF PRODUCTION):
Cost PSF (40.5 SF+ order): $9.50 (!)
Weight: 1 lb / SF
Thickness: 0.500 in (12.7 mm)
Frequency (Hz) & Associated TL (transmission loss in dB):
0125 - 17
0250 - 21
0500 - 24
1000 - 32
2000 - 34
4000 - 36
Cost PSF (40.5 SF+ order): $4.07
Weight: 1 lb / SF
Thickness: 0.375 in (9.525 mm)
Frequency (Hz) & Associated TL (transmission loss in dB):
0125 - 15
0250 - 17
0500 - 21
1000 - 28
2000 - 34
4000 - 37
B-Quiet Lcomp (OUT OF PRODUCTION):
Cost PSF (40.5 SF+ order): $9.50 (!)
Weight: 1 lb / SF
Thickness: 0.500 in (12.7 mm)
Frequency (Hz) & Associated TL (transmission loss in dB):
0125 - 17
0250 - 21
0500 - 24
1000 - 32
2000 - 34
4000 - 36
Last edited by FJF; Jun 2, 2012 at 02:42 AM.
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