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| bigmoe | Dynomax VT No Drone mufflers | ||
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Senior Guru
 
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http://www.dynomax.com/mufflers.php?muffler=vt
Has anyone seen these new Dynomax mufflers they advertise as drone free? Looks like they have a spring loaded flapper inside that opens up under acceleration and closes during cruise for no drone. It shows a cat back # 19476 for LT1 and the mufflers are 17690 and 17689. No good pictures but the pic in the instructions look like LT1 style tips and I assume it's not polished s/s. |
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Posted on: 2010/4/26 17:53
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| bogus | Re: Dynomax VT No Drone mufflers | ||
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Grand Imperial Pooh-Bah
 
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No clue/opinion.
Corsa works, that much I do know! |
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Posted on: 2010/4/26 18:28
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| iCorvette | Re: Dynomax VT No Drone mufflers | ||
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Senior Guru
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corsa's are too loud sold them.....
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Posted on: 2010/4/30 6:18
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| jmartynuska | Re: Dynomax VT No Drone mufflers | ||
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Guru
 
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Not to hyjack the thread.......
I think it could work. I've felt the source of the C4 drone is the Y intersection post main cat, where the single pipe out of the cat branches off into two pipes. No real hard data to back this up, but my theory is turbulence at that point causes the drone. I had a single 3" pipe off the cat through a resonator put on my car - primarily for weight savings - but also to test the theory. Plenty of power, mileage went up, and no drone at cruising speeds. Still a little noisy but it doesn't have that annoying drone and I can hear the radio and myself think; a muffler vs a resonator might help with the noise. Looks like this muffler works on the idea of cutting back on reversion - air running back down the pipe. Valve opens to let air out, closes to prevent air from entering. Thoughts? |
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Posted on: 2010/4/30 10:16
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| biggrizzly | Re: Dynomax VT No Drone mufflers | ||
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2011 Memorial Day Car Show Winner!
 
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Quote:
No Y pipes on my system and I still get a little droning at certain rpm. Although, not as bad as it was with the 2.59 factory gears. When I put in the 3.54 it bumped the rpm up at average round town cruise speed and the drone moved with it. Still there, but not as noticeable. |
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Posted on: 2010/4/30 10:33
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| bigmoe | Re: Dynomax VT No Drone mufflers | ||
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Senior Guru
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Well apparently the picture in the instructions that I found and the part numbers are not accurate. I contacted Dynomax. The VT is not available in a C4 specific configuration. It only comes as a unviversal muffler. In the picture that shows a cutaway of the muffler it shows the muffler is a non-baffled, straight through perforated pipe with sound insulation and that's only the front 1/2 of the muffler. The back 1/2 houses the flapper in a straight pipe. I suspect that under acceleration when the flapper is open it's not a very nice sounding muffler.
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Posted on: 2010/4/30 11:24
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| bogus | Re: Dynomax VT No Drone mufflers | ||
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Grand Imperial Pooh-Bah
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Quote:
say what? The Corsa muffler is also a straight though, with a perfertated pipe, but the insides are totally different. No padding, just a series of v-shaped baffles to break up the sound waves. Well, more accurately, reflect the waves back into themselves, canceling out the noise. The cause of the resonance is the shape of the C4 cabin itself. The storage area is its own resonance chamber. |
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Posted on: 2010/4/30 14:37
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| BillH | Re: Dynomax VT No Drone mufflers | ||
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The Stig Moderator
 
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The only thing for me is chambered pipes but I saw this:
New! Corvette Central "no drone" dual outlet mufflers for 1984-1990 Corvettes. Corvette Central is pleased to introduce our exclusive correct sounding dual outlet mufflers for the 1984-1990 Corvette. These are manufactured and welded in USA by Corvette Central (cases are manufactured in Canada). On the original 1984-1990 dual-outlet muffler, the inner outlet tube is for appearance only, and is blocked off. With our design, the outer outlet tube is open, but the inner outlet tube is connected to a small diameter resonance tube. This design provides the correct sound and quietness of the original design without the annoying low-RPM drone. |
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Posted on: 2010/4/30 14:42
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| bigmoe | Re: Dynomax VT No Drone mufflers | ||
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Senior Guru
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Bill, as it says just 84-90. Also I'm not sure why anyone would want the "correct original sound and quietness" with no drone. Most people want a nicer (louder) sound with no drone.
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Posted on: 2010/4/30 22:03
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| BillH | Re: Dynomax VT No Drone mufflers | ||
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The Stig Moderator
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Quote:
Me either, just saw them and posted because of the no drone. I have no drone but I also have really loud in the lower gears. |
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Posted on: 2010/4/30 22:07
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