Back pressure and the camaro... - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

SS>GT · 06-13-2011, 06:04 PM

i was told from an old friend the other day that for the best performance, high back pressure was needed for low Rpms and close to none was needed for higher rpms. I didnt believe him, so i removed my exhaust just after the cats and drove around for a bit. Off the line the car was horrible,but once up to speed it felt great!( sounded amazing as well)

So i got to thinking, has anyone developed an exhaust with a valve after the cats that can direct the exhaust to two different channels? One would follow through the resonators and out the muffler (for higher back pressure, lower rpms), the other straight out of the pipe (for lower back pressure, higher rps). Im assuming the valve could work off a vacuum line, just like many of the BMW's have on the mufflers.

Would this have any effect on performance at all, or is it completely a dumb idea?

csjcsj · 06-13-2011, 06:19 PM

How about something like electric cutouts?

nancygrl · 06-13-2011, 07:58 PM

ummmm, electric cutouts

SS>GT · 06-13-2011, 08:12 PM

Quote:

Originally Posted by nancygrl

ummmm, electric cutouts

Never heard of em...ill google it right now. are there any significant benefits?

SS>GT · 06-13-2011, 08:17 PM

wait, just did a search but it seems you have to elecronically open the valves...is that correct? and if thats the case, whens the best time to open them?

KnightRiderSS · 06-13-2011, 08:27 PM

Corvette comes with a dual mode exhaust...the ZL1 will come with it also...not the same as electric cut outs...which I have and are a lot of fun!

But what u are talking about is dual mode exhaust

Zach · 06-13-2011, 08:44 PM

electric cutouts are made to bypass the whole exhuast system, so basically you would pull ur exhuast off cut out a section and weld the cutouts on then run the wire to a switch inside that would open and close. you have completely close to no back pressure which gives u less accel and more top speed and its noise right outta the heads... there so loud there illegal, like someone says above.... not really illegal but if a cop is bored he will most likely get ya... but if you have electric cutouts you can just close em.... but yes.. they are DEFINITLY worth it. i spent a few days lookin researchen till i had made my own. there the manual ones but real easy to make with the right tools.

Carzzy · 06-13-2011, 11:30 PM

Would have been nice if GM offered the dual mode exhaust as a factory option on the Camaro... like they do on the Vettes. It's good for 6 more HP and sounds great when you step on it!

REDXIIIDave · 06-14-2011, 03:59 AM

Yes, and it's a $1000 + option on the Vettes. For 6hp and some noise.

mhood · 06-14-2011, 06:40 AM

Quote:

Originally Posted by REDXIIIDave

Yes, and it's a $1000 + option on the Vettes. For 6hp and some noise.

That's less than my GMPP Axle Back.

SGOS252382 · 06-14-2011, 06:44 AM

Quote:

Originally Posted by mhood

That's less than my GMPP Axle Back.

If your paid $1000.00 for an axle back exhaust you should hand over your keys.

mhood · 06-14-2011, 07:05 AM

Quote:

Originally Posted by SGOS252382

If your paid $1000.00 for an axle back exhaust you should hand over your keys.

My wife surprised me for Christmas by getting it installed at my dealer. I agree...stoopid expensive.

mikeSS · 06-14-2011, 07:12 AM

Quote:

Originally Posted by mhood

My wife surprised me for Christmas by getting it installed at my dealer. I agree...stoopid expensive.

its ok your not the only one who bought a over priced axle back + install. what was i thinking

scottyvegas · 06-14-2011, 07:15 AM

I have the Quick Time Perfromance cut outs.. Love em...Sooooooooooo LOUD!

06-13-2011, 06:04 PM	#1
SS>GT Drives: 2010 Camaro SS Join Date: Jan 2011 Location: Los Angeles Posts: 205	Back pressure and the camaro... i was told from an old friend the other day that for the best performance, high back pressure was needed for low Rpms and close to none was needed for higher rpms. I didnt believe him, so i removed my exhaust just after the cats and drove around for a bit. Off the line the car was horrible,but once up to speed it felt great!( sounded amazing as well) So i got to thinking, has anyone developed an exhaust with a valve after the cats that can direct the exhaust to two different channels? One would follow through the resonators and out the muffler (for higher back pressure, lower rpms), the other straight out of the pipe (for lower back pressure, higher rps). Im assuming the valve could work off a vacuum line, just like many of the BMW's have on the mufflers. Would this have any effect on performance at all, or is it completely a dumb idea? __________________ 2010 camaro 2ss LS3 Corsa catback exhaust w/muffler delete, hennessey intake, Pfadt springs, Hurst Short throw Shifter, Murdered black. GO TEAM LS3

06-13-2011, 06:19 PM	#2
csjcsj Drives: 2010 Camaro SS/RS 6spd Join Date: Sep 2009 Location: Jefferson, Ga Posts: 4,399 View My Garage	How about something like electric cutouts? __________________

06-13-2011, 08:17 PM	#5
SS>GT Drives: 2010 Camaro SS Join Date: Jan 2011 Location: Los Angeles Posts: 205	wait, just did a search but it seems you have to elecronically open the valves...is that correct? and if thats the case, whens the best time to open them? __________________ 2010 camaro 2ss LS3 Corsa catback exhaust w/muffler delete, hennessey intake, Pfadt springs, Hurst Short throw Shifter, Murdered black. GO TEAM LS3

06-13-2011, 08:27 PM	#6
KnightRiderSS Voodoo Medicine Man Drives: Black 2SS with RS package Join Date: Jul 2010 Location: IL Posts: 917	Corvette comes with a dual mode exhaust...the ZL1 will come with it also...not the same as electric cut outs...which I have and are a lot of fun! But what u are talking about is dual mode exhaust __________________

06-13-2011, 08:44 PM	#7
Zach 66ford pickup Drives: Still lookin for a camaro Join Date: Apr 2011 Location: Tempe Posts: 97	electric cutouts are made to bypass the whole exhuast system, so basically you would pull ur exhuast off cut out a section and weld the cutouts on then run the wire to a switch inside that would open and close. you have completely close to no back pressure which gives u less accel and more top speed and its noise right outta the heads... there so loud there illegal, like someone says above.... not really illegal but if a cop is bored he will most likely get ya... but if you have electric cutouts you can just close em.... but yes.. they are DEFINITLY worth it. i spent a few days lookin researchen till i had made my own. there the manual ones but real easy to make with the right tools. __________________ 1966 F100 352 V8 white/blue

06-13-2011, 07:58 PM	#3
nancygrl 雪の玉 Drives: '22 Z71 RST Silverado Join Date: Feb 2011 Location: South Posts: 3,415	ummmm, electric cutouts

06-13-2011, 11:30 PM	#8
Carzzy Drives: '24 Camaro 2SS Conv. & '21Blazer Join Date: May 2011 Location: Rochester NY Posts: 516 View My Garage	Would have been nice if GM offered the dual mode exhaust as a factory option on the Camaro... like they do on the Vettes. It's good for 6 more HP and sounds great when you step on it! __________________ '24 Camaro 2SS 6M Convertible

06-14-2011, 03:59 AM	#9
REDXIIIDave El Chupacabra Drives: 2011 2SS/RS A6 Black/Black Join Date: Jun 2011 Location: Lakewood, CO Posts: 923	Yes, and it's a $1000 + option on the Vettes. For 6hp and some noise.

06-14-2011, 07:15 AM	#14
scottyvegas X SS Drives: 2010 Camaro 2SSRSM6 1988 Sportside Join Date: Jan 2011 Location: iN tHE zEN dEN Posts: 661	I have the Quick Time Perfromance cut outs.. Love em...Sooooooooooo LOUD! __________________ MODS: PEDDERS XA COIL OVERS, STAGE 3 CAM, McLEOD CLUTCH, SKIP SHIFT, , HURST SHORT THROW, CAI INTAKE, SCOOP, WASHER RELO KIT, KOOKS HEADERS, KOOKS HI FLOW CATS, CUSTOM TUNE, QTP CUT OUTS, PAINTED STRIPES, PAINTED SS EMBLEMS, PAINTED FIN, PAINTED REAR TAIL LAMP BEZELS, HERITAGE GRILLE, DUCTS, AAC STUFF, BAER ROTORS, HAWK PADS, FUZZY DICE, LASER BEAMS, DISCO BALL, SYBIAN & 3 CHROME VALVE STEM CAPS................