Drone... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

storm83 · 09-06-2010, 08:33 AM

I put an aftermarket cat-back system on this weekend and it has a bad drone (the instrument panel is rattling at around 2k rpm). I have a L99 still with the AFM, but it has the same drone if I use the paddle shifters (so I really don't think its the AFM kicking in, I can hear that too but its almost drowning in the drone). Would a tune help this or will the drone still be there?

I have been thinking about solutions. and came up with three potential: 1. put a resonated x pipe, 2. put two resonators after the existing x 3. put a Helmholz bend on like has been described on these forums 4. put fatmat in the trunk.

What do you think would be the best solution?

And please no comments like Man up or live with it... This is a horrible resonance frequency in the cabin not V8 as it should sound.

axis · 09-06-2010, 09:01 AM

Which system did you get?

A resonated Xpipe might help some, but it probably won't eliminate it.
Helmoltz tube might fix it.
Dynamat won't fix it, just muffle it some.

sgseward · 09-06-2010, 09:29 AM

I added a Magnaflow Street Catback to by L99 a few weeks ago. I've never noticed the "drone", just that damn AFM noise that's been there since we bought the car. Mine goes away when I drive it in Manual mode though which is why I'm going to turn off AFM! Are you sure it's not AFM noise? On a couple of occasions I've had my AFM kick in for no reason while using the paddles, though it goes away once I shift it up or down.

I went with the Street because I feared the drone! I think I made a good choice.

Steve

Nutbutt · 09-06-2010, 09:30 AM

The only thing that really gets rid of the drone are tuning pipe. They are deadended pipes that reverberate the sound back into the exhaust to cancel the drone. Depending on your current system there is probably an option out there. The Solo exhaust guys could help you out with a recommendation. I know a couple people who have had good luck with this even when the original exhaust wasn't one of theirs.

seddon · 09-06-2010, 09:56 AM

Quote:

Originally Posted by axis

Which system did you get?

A resonated Xpipe might help some, but it probably won't eliminate it.
Helmoltz tube might fix it.
Dynamat won't fix it, just muffle it some.

+1

Or just buy the Corsa catback no drone and everyone who has it says the same.

storm83 · 09-06-2010, 11:37 AM

So I am looking around for resonators. But oddly enough they don't specify what frequencies they target, you would think that would be of interest.

As for two straight resonators or resonated X, what is the difference in sound cancelling? I am just assuming that these resonators in someway are helmholtz style cavities as well, just not a tube, or am I wrong?

BigRed585Lbs · 09-06-2010, 04:01 PM

28" Helmholtz chambers on each pipe will fix you up. And that's the truth.

KeepItGreasey · 09-06-2010, 04:22 PM

Quote:

Originally Posted by storm83

I put an aftermarket cat-back system on this weekend and it has a bad drone (the instrument panel is rattling at around 2k rpm). I have a L99 still with the AFM, but it has the same drone if I use the paddle shifters (so I really don't think its the AFM kicking in, I can hear that too but its almost drowning in the drone). Would a tune help this or will the drone still be there?

I have been thinking about solutions. and came up with three potential: 1. put a resonated x pipe, 2. put two resonators after the existing x 3. put a Helmholz bend on like has been described on these forums 4. put fatmat in the trunk.

What do you think would be the best solution?

And please no comments like Man up or live with it... This is a horrible resonance frequency in the cabin not V8 as it should sound.

do us a favor and post some exhaust/interior drone videos... to show us how bad - bad is.

mikeSS · 09-06-2010, 04:49 PM

corsa is really the man... they give one of the loudest cat backs with no drone

Roger Ramjet · 09-06-2010, 05:53 PM

I tried the muffled X-pipe - made the drone worse. I like the J-pipe much better. But, it does make the system a little quieter.

67motorcat · 09-06-2010, 06:06 PM

Here we go again......DRONE.......

Corsa is the ONLY one that won't make your head pop......

I wasted time and money till I got the Corsa system.

Dirtdog · 09-06-2010, 07:44 PM

My Borla-S type has a little drone, but its not bad at all.

mbspeed · 09-06-2010, 08:11 PM

Quote:

Originally Posted by storm83

I put an aftermarket cat-back system on this weekend and it has a bad drone (the instrument panel is rattling at around 2k rpm). I have a L99 still with the AFM, but it has the same drone if I use the paddle shifters (so I really don't think its the AFM kicking in, I can hear that too but its almost drowning in the drone). Would a tune help this or will the drone still be there?

I have been thinking about solutions. and came up with three potential: 1. put a resonated x pipe, 2. put two resonators after the existing x 3. put a Helmholz bend on like has been described on these forums 4. put fatmat in the trunk.

What do you think would be the best solution?

And please no comments like Man up or live with it... This is a horrible resonance frequency in the cabin not V8 as it should sound.

the same thing happened to me i put 4 different exhaust systems on my ss b4 i went with corsa i listened to the guys on this fourm and they are 100 % correct no drone with corsa hope you can send your exhaust back good luck

storm83 · 09-06-2010, 10:54 PM

But I don't really feel like spending $1200+ for another system. It will be fixing this or going back to stock...
I will give a J-tube a try next weekend or the weekend after, busy at work right now... Does it matter if it goes before or after the mufflers?

09-06-2010, 08:33 AM	#1
storm83 Drives: Victory Red 2SS Join Date: Feb 2010 Location: NJ Posts: 59	Drone... I put an aftermarket cat-back system on this weekend and it has a bad drone (the instrument panel is rattling at around 2k rpm). I have a L99 still with the AFM, but it has the same drone if I use the paddle shifters (so I really don't think its the AFM kicking in, I can hear that too but its almost drowning in the drone). Would a tune help this or will the drone still be there? I have been thinking about solutions. and came up with three potential: 1. put a resonated x pipe, 2. put two resonators after the existing x 3. put a Helmholz bend on like has been described on these forums 4. put fatmat in the trunk. What do you think would be the best solution? And please no comments like Man up or live with it... This is a horrible resonance frequency in the cabin not V8 as it should sound.

09-06-2010, 09:01 AM	#2
axis Search Ninja Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009 Location: Central Ark Posts: 7,183	Which system did you get? A resonated Xpipe might help some, but it probably won't eliminate it. Helmoltz tube might fix it. Dynamat won't fix it, just muffle it some. __________________ 2010 Black 2SS/RS A6 Halltech CF 102 fed GPI modded intake manifold Bo (knows) White ported TB Kooks LT's/ Dynomax VT Pfadted (springs/sways) Dyno tuned by Rhino and GPI I once parallel parked a train.

09-06-2010, 09:30 AM	#4
Nutbutt Drives: 2011 RJT 2LT/RS Convertible Join Date: Nov 2009 Location: Western Massachusetts Posts: 3,381 View My Garage	The only thing that really gets rid of the drone are tuning pipe. They are deadended pipes that reverberate the sound back into the exhaust to cancel the drone. Depending on your current system there is probably an option out there. The Solo exhaust guys could help you out with a recommendation. I know a couple people who have had good luck with this even when the original exhaust wasn't one of theirs. __________________ 1st IPF Supercharged 2011 2LT/RS RJT Convertible

09-06-2010, 05:53 PM	#10
Roger Ramjet Motor Head Drives: CTS-V Join Date: Feb 2009 Location: So MD Posts: 494	I tried the muffled X-pipe - made the drone worse. I like the J-pipe much better. But, it does make the system a little quieter. __________________ History Camaro's: 83, 93, 95, 98, & 10.

09-06-2010, 06:06 PM	#11
67motorcat Blown Cool Breeze Drives: 2011 Black on Black 2SS M6 Join Date: Jul 2010 Location: Pinehurst NC Posts: 1,027 View My Garage	Here we go again......DRONE....... Corsa is the ONLY one that won't make your head pop...... I wasted time and money till I got the Corsa system. __________________ 2011 Black on Black 2SS M6 Had a 2010 IBM 2SS M6 Enjoy life.Think of all the women on the Titanic who passed up dessert.

09-06-2010, 09:29 AM	#3
sgseward Drives: 2010 IOM 2SS Join Date: May 2010 Location: Manassas, Va Posts: 69 View My Garage	I added a Magnaflow Street Catback to by L99 a few weeks ago. I've never noticed the "drone", just that damn AFM noise that's been there since we bought the car. Mine goes away when I drive it in Manual mode though which is why I'm going to turn off AFM! Are you sure it's not AFM noise? On a couple of occasions I've had my AFM kick in for no reason while using the paddles, though it goes away once I shift it up or down. I went with the Street because I feared the drone! I think I made a good choice. Steve

09-06-2010, 11:37 AM	#6
storm83 Drives: Victory Red 2SS Join Date: Feb 2010 Location: NJ Posts: 59	So I am looking around for resonators. But oddly enough they don't specify what frequencies they target, you would think that would be of interest. As for two straight resonators or resonated X, what is the difference in sound cancelling? I am just assuming that these resonators in someway are helmholtz style cavities as well, just not a tube, or am I wrong?

09-06-2010, 04:01 PM	#7
BigRed585Lbs Drives: Sierra and Tahoe Join Date: Jul 2010 Location: By Marion, MS Posts: 1,324 View My Garage	28" Helmholtz chambers on each pipe will fix you up. And that's the truth.

09-06-2010, 04:49 PM	#9
mikeSS Drives: 2015 c7 Join Date: Nov 2009 Location: MI Posts: 7,462	corsa is really the man... they give one of the loudest cat backs with no drone

09-06-2010, 07:44 PM	#12
Dirtdog Pro Hide n Seek Player Drives: 2010 SS LS3/LSA 620whp/630tq Join Date: May 2009 Location: Tucson, AZ Posts: 921 View My Garage	My Borla-S type has a little drone, but its not bad at all. __________________ 620whp/630wtq. ADM LSA Conversion, E85, PFADT Tri-Y Headers into Borla S, PFADT Swaybars, Springs, Links, 20x10 20x11 Forgestar F14s, Lots of AAC

09-06-2010, 10:54 PM	#14
storm83 Drives: Victory Red 2SS Join Date: Feb 2010 Location: NJ Posts: 59	But I don't really feel like spending $1200+ for another system. It will be fixing this or going back to stock... I will give a J-tube a try next weekend or the weekend after, busy at work right now... Does it matter if it goes before or after the mufflers?

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