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| apeacefulstorm | catback systems and resonance..... | ||
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Guru
 
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I want to pull the trigger and get the magnaflow catback exhaust. From what I have read, if I get the X-pipe that will reduce the resonance heard inside the car, is that true?
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Posted on: 2009/5/6 13:36
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| bogus | Re: catback systems and resonance..... | ||
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Grand Imperial Pooh-Bah
 
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I have heard it is true, but have no empirical data to back that up... but if you want to eliminate resonance, Corsa is the only real option.
I have Corsa... and there is NO resonance at all. Cruising at 80mph in 6th, and the engine is silent. Amazing. All I hear is wind and road noise. And I get a lot of wind noise considering how bad my seals are. X-pipes help with scavaging. What happens is that a left bank pulse will help pressurize the right bank when there is no pressure, setting up something of a vacuum. As for resonance reduction, it evens up the bank to bank pulses, reducing noise. At least that's the theory. The C4 is a bitch for resonance. The cabin is just an echo chamber. It really sucks... So you are double whammied when it comes to dealing with it in a C4. |
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Posted on: 2009/5/6 14:34
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| CSS996 | Re: catback systems and resonance..... | ||
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Mega Guru
 
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I was pretty sure I wanted to go with Corsa, but are the dual outlets really false? Seems like I've seen a pic where I noticed only two of the four outlets looked functional.
That seems silly to me. |
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Posted on: 2009/5/6 14:47
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| bogus | Re: catback systems and resonance..... | ||
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Grand Imperial Pooh-Bah
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another urban legend.
The outer tips are used as a pressure release. 98% does go out the inner tip. These are not just another stylized exhaust. There is a lot of science going on here. Form follows function in this case. |
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Posted on: 2009/5/6 14:50
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The single biggest problem with communication is the illusion that it has taken place. - George Bernard Shaw Education is the best tool to overcome irrational fear. - me |
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| anesthes | Re: catback systems and resonance..... | ||
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Master Guru
 
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Quote:
I think it doesn't help that the C4 has no tail pipes. My LT1 catback does not resonate. I had 2 aftermarket exhausts prior, and yanked them both. I can lug the car in 6th at 1200 RPM and all I hear is the transmission rattle. Before, It would sound like the bass intro to a rap record. -- Joe |
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Posted on: 2009/5/6 14:50
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| 1Fast04Vert | Re: catback systems and resonance..... | ||
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Elite Guru
 
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I am running stock LT1 system with no mufflers, just straight pipes. I read several articles on CF about replacing the resonator with the Magnaflow dual in dual out muffler. I used MagnaFLOW #12469 which is 3" dual in and out and has the built in X-pipe. It did change the tone slightly, but overall it wasn't worth the money. Since I still have the stock cats it really isn't all that loud, nor is the resonance bad to start with.
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Posted on: 2009/5/6 15:24
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2004 Vert. 475hp. Built by Vengeance Racing |
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| apeacefulstorm | Re: catback systems and resonance..... | ||
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Guru
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cool thanks for the replies... spending the extra coin and getting corsa seems to be the way to go...
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Posted on: 2009/5/6 15:44
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| Sweet90 | Re: catback systems and resonance..... | ||
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Elite Guru
 
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Your right Andy, A guy on CF put tennis balls on his inner tips and revved it up. The tennis balls stayed put and the car did not stall. I love my Corsas, but they aren't cheap. Jim |
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Posted on: 2009/5/6 15:47
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| BillH | Re: catback systems and resonance..... | ||
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The Stig Moderator
 
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I don't agree Andy, my chambered catbacks don't resonate, so I'd say,IMO, there's at least 2 options. |
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Posted on: 2009/5/6 22:31
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| biggrizzly | Re: catback systems and resonance..... | ||
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2011 Memorial Day Car Show Winner!
 
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I have the Magnaflow 3" catback behind EM LT headers, random tech cats, and a Magnaflow X pipe, and still have resonance at 1800rpm under load.
I love the way the car sounds otherwise. It is a wonderful roar and awesome wind up to 6 grand on the tach, but 1800 at partial throttle going up a hill will rattle your teeth. Don't believe others when they say that there is little or no resonance with an Xpipe. Mine is even supposedly placed at the sweet spot too. |
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Posted on: 2009/5/7 3:32
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Don Haller Corvette Club of America 94Coupe, 383Stroka, PeteK Trans, 3000stall, 3.54rear, Konis and bigger sways. |
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| anesthes | Re: catback systems and resonance..... | ||
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Master Guru
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Quote:
Or the stock LT1 catback. The stock LT1 catback has 30% more area/flow than most of the fbody exhausts i've used, and I've had those fbody's turning some pretty impressive ET/mph. -- Joe |
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Posted on: 2009/5/7 12:13
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| BrianCunningham | Re: catback systems and resonance..... | ||
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Senior Guru
 
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The stock system actually flows pretty good.
You need a serious engine to make it out. |
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Posted on: 2009/5/7 20:33
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Polo Green 95 LT1 6-spd http://mysite.verizon.net/vzevcp74/ 383 LT1/Vortech Supercharger/AFR heads/Rod end suspension/Penske-Hardbar dual rate coilovers/Wilwood 6pot brakes NCCC Governor: http://BayStateCorvetteClub.com |
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| tobijohn | Re: catback systems and resonance..... | ||
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Senior Guru
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Is there any hard data on what the stock LTx exhaust actually flows? And Brian, where exactly HP/ft-lbs wise, does the stock exhaust become a bottleneck? TIA... |
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Posted on: 2009/5/8 0:57
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John 1996 LT4 coupe black/black 160 Tstat, K&N, Hypertech PPIII (for the fans), CAGS, Nitto 555 EPs, 275/315s, Chrome A-molds, a little tint and some black-outs AIRFOIL FREE! |
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| Josh | Re: catback systems and resonance..... | ||
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Guru
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I have 2 Magnaflow mufflers, an Dr. Gas X pipe, no cats, and Hooker 2151's. The resonance under load is pretty bad around 1800 or so.
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Posted on: 2009/5/8 13:45
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| dan0617 | Re: catback systems and resonance..... | ||
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Senior Guru
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I have hooker 2151's, no cats or resonator, custom midpipes back to a stock LT1 catback (or actually from about the differential back). No resonance. I had the same setup hooked up to the stock L98 system from the axle back and the resonance was horrid. Installing the LT1 catback made the car so much more pleasant to drive at cruising rpms in overdrive.
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Posted on: 2009/5/8 13:59
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ยด89 Vert, 383, 230/236 cam, AFR 195's, LT Headers, HSR intake, 2800 stall, Zex 200 shot, ET Street Radials, tune by me. Runs were with D36 3.07's. On spray, 10.55 @ 132.78, 1.55 60 ft. On motor, 12.08 @ 113.15, 1.66 60 ft. |
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