Flowmaster drone, reinstall resonators? - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

fdxdispatcher · 01-12-2013, 05:21 PM

I'm not happy with the drone at lower rpm's with my flowmaster american thunder cat back. Looking at some other threads, it seems my best option is adding resonators. I know it would take some pipe size changes, but could I have the factory resonators reinstalled with this system? I have the LS3 automatic. Thanks in advance.

SPCBA · 01-12-2013, 05:38 PM

best choice would be j pipes. screw resonaters.

nyrfan · 01-12-2013, 05:39 PM

The is no such thing as as LS3 automatic, if you have an auto you have an L99. And if you have an L99 you are hearing AFM. The only way to get rid of AFM will be a tune, especially with flowmasters.

Resonators and j-pipes will help a bit, but only a small amount, you will still hear what you are hearing.

I put a Corsa cat-back on and in 5 miles pulled it off. Corsa along with solo is supposed to be the best at masking AFM and it still sucked.

Felix - Sent from my 2SS/RS

fdxdispatcher · 01-12-2013, 05:46 PM

Sorry, you're right, it's the L99. Not sure what is meant by the tune and AFM?

nyrfan · 01-12-2013, 05:55 PM

Quote:

Originally Posted by fdxdispatcher

Sorry, you're right, it's the L99. Not sure what is meant by the tune and AFM?

AFM is active fuel management. AFM kicks in under light load and drops your car to 4 cylinders, this is what you are hearing. The only way to get rid of it is to tune your cars computer but if you do that you void your power train warranty.

AFM sucks!

Felix - Sent from my 2SS/RS

2SSRSinBama · 01-12-2013, 06:00 PM

the l99 cuts down from 8 to 4 cylinders with AFM, that is what you are hearing... the stock mufflers hides that, they have a j-pipe in them, which is why they are so big... the only way to get rid of that terrible noise is to tune out AFM by tuning the ECM... j-pipes will help a little but the best bet is tuning it out... that is what sucks about the l99, you either have to tune, have a really quite exhaust note, or hear the AFM if you go aftermarket...

but once you tune it out, the options are endless and just depends on how mild or wild you want your car to sound

fdxdispatcher · 01-12-2013, 06:05 PM

Ok, gotcha, I understand. Short of reinstalling the factory exhaust which would cost too much since I've already spent so much on the Flowmaster, and I don't want to tune out the AFM, is there something I can put on to stop the drone? Suggested J pipes might work, but I don't like what I've seen on those.

nyrfan · 01-12-2013, 06:11 PM

Quote:

Originally Posted by fdxdispatcher

Ok, gotcha, I understand. Short of reinstalling the factory exhaust which would cost too much since I've already spent so much on the Flowmaster, and I don't want to tune out the AFM, is there something I can put on to stop the drone? Suggested J pipes might work, but I don't like what I've seen on those.

unless you tune or go back to stock like I did, AFM noise will always be there.

In the near future I plan to tune and add headers and high flow cats.

Felix - Sent from my 2SS/RS

Nitroman28 · 01-12-2013, 06:32 PM

Quote:

Originally Posted by nyrfan

The is no such thing as as LS3 automatic, if you have an auto you have an L99. And if you have an L99 you are hearing AFM. The only way to get rid of AFM will be a tune, especially with dronemasters.

Resonators and j-pipes will help a bit, but only a small amount, you will still hear what you are hearing.

I put a Corsa cat-back on and in 5 miles pulled it off. Corsa along with solo is supposed to be the best at masking AFM and it still sucked.

Felix - Sent from my 2SS/RS

I have a LS3 A6.

MarylandSpeed · 01-12-2013, 06:32 PM

Disable AFM..if that does not work, get better mufflers. There are plenty of mufflers that sound great without having to weld on extra resonators and j-pipes.

nyrfan · 01-12-2013, 06:37 PM

Quote:

Originally Posted by Nitroman28

I have a LS3 A6.

Although built off the LS3 platform an auto is considered an L99. Unless I am missing something

.

Felix - Sent from my 2SS/RS

Red Jewel RS · 01-12-2013, 06:43 PM

AFM can be disabled in M mode. Put shifter in M mode, tap shift down, then up, then down again. AFM is now disabled until you shift out of M. But you have to shift by using the tap shift while driving. The drone is not noticeable then. I have Flowmasters.

nyrfan · 01-12-2013, 06:44 PM

Quote:

Originally Posted by Red Jewel RS

AFM can be disabled in M mode. Put shifter in M mode, tap shift down, then up, then down again. AFM is now disabled until you shift out of M. But you have to shift by using the tap shift while driving. The drone is not noticeable then. I have Flowmasters.

Good point, I always forget about that

BigRed585Lbs · 01-12-2013, 06:53 PM

What's the matter with adding j's to your Flows as others have done on this forum? You can't see them from behind and they work.

01-12-2013, 05:21 PM	#1
fdxdispatcher Drives: 2013 Camaro 2SS/RS Join Date: Dec 2012 Location: North Mississippi Posts: 40	Flowmaster drone, reinstall resonators? I'm not happy with the drone at lower rpm's with my flowmaster american thunder cat back. Looking at some other threads, it seems my best option is adding resonators. I know it would take some pipe size changes, but could I have the factory resonators reinstalled with this system? I have the LS3 automatic. Thanks in advance.

01-12-2013, 05:39 PM	#3
nyrfan Let's go Rangers! Drives: 13' AGM 2SS/RS L99 Join Date: Jun 2011 Location: Orlando, FL Posts: 10,742 View My Garage	The is no such thing as as LS3 automatic, if you have an auto you have an L99. And if you have an L99 you are hearing AFM. The only way to get rid of AFM will be a tune, especially with flowmasters. Resonators and j-pipes will help a bit, but only a small amount, you will still hear what you are hearing. I put a Corsa cat-back on and in 5 miles pulled it off. Corsa along with solo is supposed to be the best at masking AFM and it still sucked. Felix - Sent from my 2SS/RS __________________ Soprano 4/1/00-6/14/11, Gone but NEVER forgotten! FSP tuned: 377/389 Last edited by nyrfan; 01-12-2013 at 06:45 PM.

01-12-2013, 06:00 PM	#6
2SSRSinBama Drives: 2010 2SS/RS Camaro CGM Join Date: Aug 2011 Location: "The Shoals" Alabama Posts: 767	the l99 cuts down from 8 to 4 cylinders with AFM, that is what you are hearing... the stock mufflers hides that, they have a j-pipe in them, which is why they are so big... the only way to get rid of that terrible noise is to tune out AFM by tuning the ECM... j-pipes will help a little but the best bet is tuning it out... that is what sucks about the l99, you either have to tune, have a really quite exhaust note, or hear the AFM if you go aftermarket... but once you tune it out, the options are endless and just depends on how mild or wild you want your car to sound __________________ 2010 Camaro SS L99... has a few mods

01-12-2013, 05:38 PM	#2
SPCBA Drives: pleather and Chiclets Join Date: Mar 2012 Location: a line somwhere Posts: 4,206 View My Garage	best choice would be j pipes. screw resonaters.

01-12-2013, 05:46 PM	#4
fdxdispatcher Drives: 2013 Camaro 2SS/RS Join Date: Dec 2012 Location: North Mississippi Posts: 40	Sorry, you're right, it's the L99. Not sure what is meant by the tune and AFM?

01-12-2013, 06:05 PM	#7
fdxdispatcher Drives: 2013 Camaro 2SS/RS Join Date: Dec 2012 Location: North Mississippi Posts: 40	Ok, gotcha, I understand. Short of reinstalling the factory exhaust which would cost too much since I've already spent so much on the Flowmaster, and I don't want to tune out the AFM, is there something I can put on to stop the drone? Suggested J pipes might work, but I don't like what I've seen on those.

01-12-2013, 06:32 PM	#10
MarylandSpeed Account Suspended Drives: 2012 ZL1 & 2010 2SS/RS Join Date: Jul 2009 Location: Maryland Posts: 3,378	Disable AFM..if that does not work, get better mufflers. There are plenty of mufflers that sound great without having to weld on extra resonators and j-pipes.

01-12-2013, 06:43 PM	#12
Red Jewel RS Drives: 2010 Camaro 2SS Join Date: Apr 2010 Location: Billings, MT Posts: 891 View My Garage	AFM can be disabled in M mode. Put shifter in M mode, tap shift down, then up, then down again. AFM is now disabled until you shift out of M. But you have to shift by using the tap shift while driving. The drone is not noticeable then. I have Flowmasters.

01-12-2013, 06:53 PM	#14
BigRed585Lbs Drives: Sierra and Tahoe Join Date: Jul 2010 Location: By Marion, MS Posts: 1,324 View My Garage	What's the matter with adding j's to your Flows as others have done on this forum? You can't see them from behind and they work.