Added X-Pipe and Now....... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Missile Man · 01-04-2013, 02:57 PM

So I just had a tru x-pipe installed to complet my exhaust

It sounds great! The only down side is a prominate drone at 1.6K and lower RPM's. Is this normal? If it is than I can live with it by down shifting to keep the RPM's up. Or are the 40 series are too much?

axis · 01-05-2013, 03:45 PM

A set of whistle tips will keep you from hearing that nasty drone. Works better than J pipes and a LOT cheaper.

ReoRockStar · 01-05-2013, 03:57 PM

Whistle tips?

Missile Man · 01-05-2013, 04:06 PM

Quote:

Originally Posted by axis

A set of whistle tips will keep you from hearing that nasty drone. Works better than J pipes and a LOT cheaper.

I tuned out the AFM some time ago. I thought the J pipes were to help with the running on 4 cylinder drone? Does the LS3 have this issue?

Ditto: whistle tips ?

SPCBA · 01-05-2013, 04:53 PM

Drone and afm aren't mutually inclusive. You can have one without the other. J pipes cut to the proper length eliminate a desired frequency.

naSSty1 · 01-05-2013, 05:26 PM

I just keep my RPM's up closer to 2000. No drone here. HAHAH

axis · 01-05-2013, 06:12 PM

Quote:

Originally Posted by ReoRockStar

Whistle tips?

Quote:

Originally Posted by Missile Man

I tuned out the AFM some time ago. I thought the J pipes were to help with the running on 4 cylinder drone? Does the LS3 have this issue?

Ditto: whistle tips ?

J pipes in the proper length and place should eliminate drone at the problematic RPM. There's a formula you use to calculate that. AFM sound is mechanical and can't be eliminated. It can be lessened, but not totally eliminated. Aftermarket exhausts make your exhaust louder. This also makes AFM louder if you still have it enabled. Series 40 FM's are loud and will drone. Typically, the louder the exhaust, the more prone to drone.

Missile Man · 01-06-2013, 10:45 AM

Quote:

Originally Posted by SPCBA

Drone and afm aren't mutually inclusive. You can have one without the other. J pipes cut to the proper length eliminate a desired frequency.

Ok, make sense certain rpm's = non desired resonance frequencies depending on the make up of the exhaust system.

Thanks for the info!

ARK Performance · 01-07-2013, 12:13 PM

Once the Xpipe is added, drone usually occurs at a lower frequency. If you were to go toward the helmholtz route, it would be shorter.

BigRed585Lbs · 01-07-2013, 01:29 PM

Once again, grasshoppers, the "simplified" formula for determining the length of a Helmholtz quarter-wave chamber dealing with the elimination of a known resonance frequency is as follows:

The speed of sound in feet per second (say, 1072feet/second)
divided by
The frequency you wish to eliminate (say, 128cycles/second)
equals
8.375feet/cycle (numbers divide/seconds cancel out)
This is the length of a full wave form; much too big to work with under a vehicle.
To get a quarter-wave length, divide 8.373feet/cycle by 4 to get 2.09373feet/quarter-wave length.
Multiply 2.09373feet/quarter-wave by 12inches/foot to get the chamber length of 25.125".

Tube diameter does not affect frequency, only the amount of attenuation.
This worked back in 2009, and it still works today.

Be sure to use your own target frequency in the formula.
The speed of sound figure is not going to vary enough to worry about. We're not rocket scientists.

REMEMBER: Be sure to use your own target frequency in the formula.

Missile Man · 01-08-2013, 09:05 AM

Once again great info! Thanks.

Deucez75 · 06-11-2013, 10:29 PM

Whistle tips?

axis · 06-11-2013, 10:42 PM

Quote:

Originally Posted by Deucez75

Whistle tips?

Did you totally miss post #7?

woolf · 06-12-2013, 04:43 AM

Quote:

Originally Posted by axis

Did you totally miss post #7?

Yah, they for decoration! Wha whoo........

01-04-2013, 02:57 PM	#1
Missile Man Drives: 2010 2SS/Black Join Date: Mar 2009 Location: Tucson, AZ Posts: 608	Added X-Pipe and Now....... So I just had a tru x-pipe installed to complet my exhaust It sounds great! The only down side is a prominate drone at 1.6K and lower RPM's. Is this normal? If it is than I can live with it by down shifting to keep the RPM's up. Or are the 40 series are too much? __________________ 2010 Black 2SS L99 Mods: * CAI Intake * Magnuson MP2300 TVS Supercharger/RDS Spacer * Vector Motorsports Tune * Stainless Power LT/Hi Flow Cats/Tru X-* Pipe/36" J-Pipes/40 Series * R1 Concepts ceramic pads and slotted/drilled rotors

01-05-2013, 03:45 PM	#2
axis Search Ninja Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009 Location: Central Ark Posts: 7,183	A set of whistle tips will keep you from hearing that nasty drone. Works better than J pipes and a LOT cheaper. __________________ 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.

01-05-2013, 03:57 PM	#3
ReoRockStar Drives: 2012 Camaro 2LT 45th AE Join Date: Sep 2012 Location: New Jersey - North Jersey Posts: 832 View My Garage	Whistle tips? __________________

01-08-2013, 09:05 AM	#11
Missile Man Drives: 2010 2SS/Black Join Date: Mar 2009 Location: Tucson, AZ Posts: 608	Once again great info! Thanks. __________________ 2010 Black 2SS L99 Mods: * CAI Intake * Magnuson MP2300 TVS Supercharger/RDS Spacer * Vector Motorsports Tune * Stainless Power LT/Hi Flow Cats/Tru X-* Pipe/36" J-Pipes/40 Series * R1 Concepts ceramic pads and slotted/drilled rotors

06-11-2013, 10:29 PM	#12
Deucez75 Drives: 2011 Camaro SS convertible V8 Join Date: Nov 2012 Location: Florida Posts: 14	Whistle tips? __________________ Topless in Paradise

01-05-2013, 04:53 PM	#5
SPCBA Drives: pleather and Chiclets Join Date: Mar 2012 Location: a line somwhere Posts: 4,206 View My Garage	Drone and afm aren't mutually inclusive. You can have one without the other. J pipes cut to the proper length eliminate a desired frequency.

01-05-2013, 05:26 PM	#6
naSSty1 Drives: 2010 Camaro SS Join Date: Jun 2012 Location: Georgia Posts: 279	I just keep my RPM's up closer to 2000. No drone here. HAHAH

01-07-2013, 12:13 PM	#9
ARK Performance Drives: Corvette C7 Join Date: Oct 2009 Location: Ontario, CA 91761 Posts: 1,364	Once the Xpipe is added, drone usually occurs at a lower frequency. If you were to go toward the helmholtz route, it would be shorter.

01-07-2013, 01:29 PM	#10
BigRed585Lbs Drives: Sierra and Tahoe Join Date: Jul 2010 Location: By Marion, MS Posts: 1,324 View My Garage	Once again, grasshoppers, the "simplified" formula for determining the length of a Helmholtz quarter-wave chamber dealing with the elimination of a known resonance frequency is as follows: The speed of sound in feet per second (say, 1072feet/second) divided by The frequency you wish to eliminate (say, 128cycles/second) equals 8.375feet/cycle (numbers divide/seconds cancel out) This is the length of a full wave form; much too big to work with under a vehicle. To get a quarter-wave length, divide 8.373feet/cycle by 4 to get 2.09373feet/quarter-wave length. Multiply 2.09373feet/quarter-wave by 12inches/foot to get the chamber length of 25.125". Tube diameter does not affect frequency, only the amount of attenuation. This worked back in 2009, and it still works today. Be sure to use your own target frequency in the formula. The speed of sound figure is not going to vary enough to worry about. We're not rocket scientists. REMEMBER: Be sure to use your own target frequency in the formula.