Concerns With Exhaust Flow With My New Cutouts - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

honor first · 12-07-2013, 05:18 PM

Exhaust question!

I have electric cutouts set up like this (not my car though):

I have not even wired the cutouts, so they are open 100% right now. But when I was installing, I ran for a few minutes with them closed.

Does running them closed create an issue? Having the exhaust go down the pipes, about a foot long, and then not be able to escape? Cause any issues with that exhaust coming back up into the flow? I know exhausts are high science, scavenging and the technology behind exhaust flow, so this is beyond me.

Thanks amigos.

Shift_Rejected · 12-07-2013, 05:34 PM

I'm not an expert but I think the reason behind electric cutouts is so you can open and close them at will..

*SSE 4 2SS* · 12-07-2013, 05:36 PM

It won't hurt anything... It'll charge that area and then flow right on by the cutout opening...

62nalide · 12-07-2013, 05:37 PM

Should be fine imo

honor first · 12-07-2013, 05:45 PM

Quote:

Originally Posted by Shift_Rejected

I'm not an expert but I think the reason behind electric cutouts is so you can open and close them at will..

indeed, the only time i ever closed them on my CTSV was pulling in my neighborhood at 4AM (work schedule), and on long road trips. That is the plan here, I just haven't wired them yet.

honor first · 12-07-2013, 05:47 PM

Quote:

Originally Posted by 62nalide

Should be fine imo

got a link to your build? 11 second sounds like my first goal here after cam.

Quote:

Originally Posted by SSE 4 2SS

It won't hurt anything... It'll charge that area and then flow right on by the cutout opening...

sounds good thanks for the input.

anymore input is welcome!

62nalide · 12-07-2013, 06:22 PM

Quote:

Originally Posted by honor first

got a link to your build? 11 second sounds like my first goal here after cam.

sounds good thanks for the input.

anymore input is welcome!

Don't have a build thread but its a header intake Pulley and converter setup with a Rhino79 tune. Still rocking the stock cam

Sickness91Z28 · 12-07-2013, 10:00 PM

I haven't seen cutouts installed that far back on the exhaust. They sound pretty descent being that far back?

honor first · 12-08-2013, 01:12 AM

Quote:

Originally Posted by Sickness91Z28

I haven't seen cutouts installed that far back on the exhaust. They sound pretty descent being that far back?

yeah all my GM v8 vehicles ive put them back there. still loud and all the good noise up front, but without it being overwhelming, and rattling the cabin, and all that negative stuff. sounds great

axis · 12-08-2013, 07:42 AM

J pipes are in almost the exact same spot and they are closed.

Iam Broke · 12-08-2013, 09:18 AM

Depending on the length, they will be Helmholtz chambers at a higher frequency than the Solo j's are used at to kill drone. If they are 18" or so (guessing from the pic) with them closed you may notice the exhaust is actually quieter at say 3k-3.5k rpm than stock. The exhaust pulses reflect back out of phase and cancel the incoming pulses at a resonant frequency based upon length, ect.

Might not notice much resonance since yours are stubbed on at an angle, not sure. Should not cause an issue at all at any rate.

67motorcat · 12-08-2013, 01:25 PM

That is almost the same place I installed mine,although mine are bolted together,no issue at all running them closed.

Nice and quiet when closed,sounds mean when open.I installed mine last summer.

It's nice to finally see more people mount them this way keeping the interior from rattling and everything under the car getting hot and black.

Sickness91Z28 · 12-08-2013, 01:48 PM

Looks great. Not trying to be a turd, but mine are located under the front seats.....and I don't have any rattles at all. Might depend if you don't have the turn downs or not

honor first · 12-08-2013, 04:46 PM

Quote:

Originally Posted by Iam Broke

Depending on the length, they will be Helmholtz chambers at a higher frequency than the Solo j's are used at to kill drone. If they are 18" or so (guessing from the pic) with them closed you may notice the exhaust is actually quieter at say 3k-3.5k rpm than stock. The exhaust pulses reflect back out of phase and cancel the incoming pulses at a resonant frequency based upon length, ect.

Might not notice much resonance since yours are stubbed on at an angle, not sure. Should not cause an issue at all at any rate.

like i said, exhaust is high science ha. thanks for the input

67motorcat, glad to here, super clean install there

12-07-2013, 05:18 PM	#1
honor first MURICA! Drives: 2014 2SS 1LE Join Date: Sep 2013 Location: RGV, Texas Posts: 459	Concerns With Exhaust Flow With My New Cutouts Exhaust question! I have electric cutouts set up like this (not my car though): I have not even wired the cutouts, so they are open 100% right now. But when I was installing, I ran for a few minutes with them closed. Does running them closed create an issue? Having the exhaust go down the pipes, about a foot long, and then not be able to escape? Cause any issues with that exhaust coming back up into the flow? I know exhausts are high science, scavenging and the technology behind exhaust flow, so this is beyond me. Thanks amigos. __________________ *Pro Amore Patriae* God gave three gifts to man; dogs, women, and the LS motor. 2014 Camaro 2SS 6MT RS 1LE Black on Black AFE Intake, Stainless Power Headers + HFC, BadlanzHPE Electric Cutouts. 315/275 Nittos, Wheels. Debadged, Cosmetic Mods, Sound System, More Last edited by honor first; 12-08-2013 at 05:47 PM.

12-07-2013, 05:36 PM	#3
SSE 4 2SS Boosted Moderator Drives: Bone Stock LS3 Join Date: Sep 2009 Location: Marion Tx Posts: 15,558	It won't hurt anything... It'll charge that area and then flow right on by the cutout opening... __________________ If the car feels like it is on rails, you are probably driving too slow. -Ross Bentley Horsepower is how fast you hit the wall. Torque is how far you take the wall with you. “If everything seems under control, you're just not going fast enough.” Mario Andretti If you can turn, you ain't going fast enough...

12-07-2013, 05:37 PM	#4
62nalide Drives: 2013 SS Join Date: May 2013 Location: DFW Posts: 4,102	Should be fine imo __________________ https://frankensteined.net/ Martin@Frankensteined.net

12-07-2013, 10:00 PM	#8
Sickness91Z28 Reaper Crew Drives: Blown 2010 Camaro SS Join Date: Aug 2012 Location: Indiana Posts: 985	I haven't seen cutouts installed that far back on the exhaust. They sound pretty descent being that far back? __________________ 2010 Camaro SS SLP TVS2300 Blower, Blower Cam, Lingenfelter Heads, Meth Injected, 5lbs of Boost@700 BHP Pedders XA Coilovers

12-08-2013, 07:42 AM	#10
axis Search Ninja Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009 Location: Central Ark Posts: 7,183	J pipes are in almost the exact same spot and they are closed. __________________ 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.

12-07-2013, 05:34 PM	#2
Shift_Rejected 2010 2SS RS Drives: 2010 2SS RS (L99) Join Date: Aug 2013 Location: Wilmington, DelaWHERE Posts: 749	I'm not an expert but I think the reason behind electric cutouts is so you can open and close them at will..

12-08-2013, 09:18 AM	#11
Iam Broke PHAT B33 Drives: 2012 TF3 Camaro 2SS/RS M6 Join Date: Jun 2012 Location: Dark of the Moon Posts: 1,460 View My Garage	Depending on the length, they will be Helmholtz chambers at a higher frequency than the Solo j's are used at to kill drone. If they are 18" or so (guessing from the pic) with them closed you may notice the exhaust is actually quieter at say 3k-3.5k rpm than stock. The exhaust pulses reflect back out of phase and cancel the incoming pulses at a resonant frequency based upon length, ect. Might not notice much resonance since yours are stubbed on at an angle, not sure. Should not cause an issue at all at any rate. __________________ Another 1 of 371 '12 T3 LS3 M6's built. Last edited by Iam Broke; 12-08-2013 at 09:43 AM.

12-08-2013, 01:25 PM	#12
67motorcat Blown Cool Breeze Drives: 2011 Black on Black 2SS M6 Join Date: Jul 2010 Location: Pinehurst NC Posts: 1,027 View My Garage	That is almost the same place I installed mine,although mine are bolted together,no issue at all running them closed. Nice and quiet when closed,sounds mean when open.I installed mine last summer. It's nice to finally see more people mount them this way keeping the interior from rattling and everything under the car getting hot and black. Attached Images __________________ 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.

12-08-2013, 01:48 PM	#13
Sickness91Z28 Reaper Crew Drives: Blown 2010 Camaro SS Join Date: Aug 2012 Location: Indiana Posts: 985	Looks great. Not trying to be a turd, but mine are located under the front seats.....and I don't have any rattles at all. Might depend if you don't have the turn downs or not __________________ 2010 Camaro SS SLP TVS2300 Blower, Blower Cam, Lingenfelter Heads, Meth Injected, 5lbs of Boost@700 BHP Pedders XA Coilovers