Muffler Too Loud
Muffler Too Loud
OK, got a question. I have a Walker 'sound FX' muffler on the Q4 GTZ. Nothing special, just ordered right off the RA web site. It was fine until I pulled the cat and replaced it with a flow through pipe. Now the exhaust is too loud & too raspy. I wake the neighbors up in the morning leaving for work.
I need to find something quieter, but ideally not Buick quiet. So, do any of you have a recommendation that you've tried (or presently have installed) on a Q4 without a cat?
I need to find something quieter, but ideally not Buick quiet. So, do any of you have a recommendation that you've tried (or presently have installed) on a Q4 without a cat?
2011 Equinox LT (daily driver)
1981 Omega Sport (waiting to be restored)
Photobucket: http://s912.photobucket.com/albums/ac324/dhenderz/
1981 Omega Sport (waiting to be restored)
Photobucket: http://s912.photobucket.com/albums/ac324/dhenderz/
Re: Muffler Too Loud
A cat and a resonator in combination with a muffler is the only way to quiet these things down. A guy on Q4F was running two mufflers if I remember correctly, but I don't recall how he rigged that up. I know mine is way loud with the header, cat, muffler - and I want to eventually get a resonator or something installed eventually because I feel the same way about my neighbors when I leave early in the morning.
1990 GTZ Quad 4 HO
Re: Muffler Too Loud
You could put a small resonator where the cat used to be. Unfortunately cats do a great job of killing raspy stuff.
- SuzukiGhostRider
- Registered User
- Posts: 2464
- Joined: Tue Feb 12, 2008 4:07 am
- Location: Milan NM
- Contact:
Re: Muffler Too Loud
Get rid of the straight pipe and put a 22" or better glasspack in it's place. You will find this will quiet it down considerably , get rid of the raspy, and retain the added throttle response and slight power gain.
- berettaboi
- Registered User
- Posts: 973
- Joined: Sun Mar 23, 2008 10:58 pm
- Location: canananada
Re: Muffler Too Loud
i'm not sure what studies show, if a 'high flow' cat is actually high flow... but i'm kinda a half ass tree hugger, so i would keep one in the mix just for my piece of mind.
4th one's a charm, 5th one is, beginnning to sound like this is an addiction...
95 black z26, '96 White z26 awaiting new life, and 2.5 mazda trucks
95 black z26, '96 White z26 awaiting new life, and 2.5 mazda trucks
Re: Muffler Too Loud
A quad doesn't need a catalytic converter to be environmentally friendly. It gets 30+ mpg on its own.
The only solution I've heard of working is the resonator in place of the cat, but I've yet to find a combination that doesn't rice out after 3 to 3500 rpm.
The only solution I've heard of working is the resonator in place of the cat, but I've yet to find a combination that doesn't rice out after 3 to 3500 rpm.
My Motortopia
Bfest Committee 2012, 2013, 2014
Bfest AND Bust 2012 Winner: First ever clutch swap at Berettafest!
Bfest 2013 Watermelon Award: Boob shaped hood dents FTW
Re: Muffler Too Loud
I have 3 mufflers on my Quad and it's still louder than anything out there. Quad is really hard to tone down, add in big tube headers and pipe, you can challenge a helicopter for noise level.
I haven't ever heard a decently quiet Quad Without cat .
I haven't ever heard a decently quiet Quad Without cat .
- 3X00-Modified
- Administrator
- Posts: 10912
- Joined: Thu Jul 05, 2007 9:18 am
- Location: Brooklyn CT
Re: Muffler Too Loud
This is quite possibly the reason why... I pulled this from www.overboost.com just so people know.
And typical miss information regarding a resonator.
So the best way to muffle something is by a bit of restriction unfortunately...Types of Muff
Mufflers can take care of the silencing chores by three major methods: Absorption, Restriction, and Reflection. Mufflers can use one method, or all three, to attenuate sound that is not so pleasing to the ears of the Highway Patrol.
The absorption method is probably the least effective at quelling engine roar, but the benefit is that "absorbers" are also best at letting exhaust gas through. Good examples of absorbers are the mufflers found in GReddy BL-series exhausts, DynoMax UltraFlow, and the good old-fashioned Cherry Bomb glasspack.
Absorption mufflers are also the simplest. All of the above named mufflers utilize a simple construction consisting of a perforated tube that goes through a can filled with a packing material, such as fiberglass or steel wool. This is similar to simply punching holes in your exhaust pipe, then wrapping it up with insulation. Neat, huh?
Another trick absorption mufflers use to kill off noise is, well, tricky. For example, the Hooker Aero Chamber muffler is a straight-through design, with a catch. Instead of a simple, perforated tube, there is a chamber inside the muffler that is much larger than the rest of the exhaust pipe. This design abates sound more efficiently than your standard straight-through because when the exhaust gasses enter this large chamber they slow down dramatically. This gives them more time to dwell in the sound insulation, and thus absorb more noise. The large chamber gently tapers back into the smaller size of your exhaust pipe, and the exhaust gasses are sent on their merry way to the tailpipe.
Restriction
Doesn't that word just make your skin crawl? It's right up there in the same league with words like "maim" and "rape".
Obviously, a restrictive muffler doesn't require much engineering expertise, and is almost always the least expensive to manufacture. Thus, we find restrictive mufflers on almost all OEM exhaust systems. We won't waste much time on the restrictive muffler except to say that if you got 'em, you might not want to flaunt 'em.
Reflection
Probably the most sophisticated type of muffler is the reflector. They often utilize absorption principles in conjunction with reflection to make the ultimate high-performance silencer. Remember any of your junior high school math? Specifically, that like numbers cancel each other when on a criss-cross? That's the same principal used by the reflective muffler. Sound is a wave. And when two like waves collide, they will "cancel" each other and leave nothing to call a corpse but a spot of low-grade heat.
There are numerous engineering tricks used in the reflective muffler. Hedman Hedders makes a muffler that looks a lot like a glasspack. In fact, it is a glasspack with a catch. The outer casing is sized just-so, so that high-pitched engine sound (what we deem "noise") is reflected back into the core of the muffler… where those sound waves meet their maker as they slam right into a torrent of more sound waves of like wavelength coming straight from the engine. And, this muffler is packed with a lot of fiberglass to help absorb any straggling noise that might be lagging behind.
And typical miss information regarding a resonator.
Check a stock 3100 resonator, its a big 4-5" bulge and all thats in it is ONE plate in the middle with a 2" hole in the center of it... No glass packing at all. I'm tempted to install that on my car just to bring the noise down a bit.Resonators
On your typical cat-back exhaust system, you'll see a couple of bulges in the piping that are apparently mini-mufflers out to help the big muffler that hangs out back. These are called Helmholtz Resonators and are very similar to glasspacks. The main difference is that firstly, there is no sound-absorbing fiberglass or steel wool in a Resonator. And secondly, their main method of silencing is the reflective principle, not absorption. An easy way to tell the difference between a glasspack and a true Helmholtz Resonator is to "ping" one with your finger. A glasspack will make a dull thud, and a true Resonator will make a clear "ping!" sound.
- woody90gtz
- Registered User
- Posts: 4698
- Joined: Thu Jul 11, 2002 8:45 pm
- Location: Walton, NY
- Contact:
Re: Muffler Too Loud
Dynomax VT...quiet at idle and light cruise, but still loud at WOT.
91 "SS" - WOT 3400/5spd - 13.29@101.6 - World's fastest N/A FWD Beretta
96 "T56" LS/6spd/8.8 RWD swap - 13.45@104.7 lol
GEARHEAD dezign youtube
96 "T56" LS/6spd/8.8 RWD swap - 13.45@104.7 lol
GEARHEAD dezign youtube
Re: Muffler Too Loud
Sorry, but this got me thinking about having a beretta that was silent but deadly!! LOLdhenderz wrote:OK, got a question. I have a Walker 'sound FX' muffler on the Q4 GTZ. Nothing special, just ordered right off the RA web site. It was fine until I pulled the cat and replaced it with a flow through pipe. Now the exhaust is too loud & too raspy. I wake the neighbors up in the morning leaving for work.
I need to find something quieter, but ideally not Buick quiet. So, do any of you have a recommendation that you've tried (or presently have installed) on a Q4 without a cat?
/offtopic
94' Z26 Project - 95' Base Project - Custom LED Light Conversions!
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan
Chosen Proposal Submission & Committee Member for Beretta Fest 2012 in Traverse City Michigan
- SuzukiGhostRider
- Registered User
- Posts: 2464
- Joined: Tue Feb 12, 2008 4:07 am
- Location: Milan NM
- Contact:
Re: Muffler Too Loud
I am telling you (through personal experience) that if you do what I said with a glass pack of the size mentioned, it WILL return it VERY close , if not dead on, to factory noise level.
-
- Registered User
- Posts: 1068
- Joined: Sun Nov 02, 2003 11:54 am
- Location: Paulden, AZ
- Contact:
Re: Muffler Too Loud
I have to chime in here, im sorry.
Coming from a person who ran for over a year without a cat on my car, put the damn thing back on. Quads sound like crap without a cat. There is nothing you can do to make it sound any better than it does with a cat installed. Plus, with my cat removed back in the day (and no other mods done), i got 32 on the highway at best; with the cat back on, i did a best of 39mpg. Do yourself a favor, and install atleast a shorty Magnaflow cat and call it a day.
I dont get why people remove cats from their quads then complain about the noise....*facepalm*
Coming from a person who ran for over a year without a cat on my car, put the damn thing back on. Quads sound like crap without a cat. There is nothing you can do to make it sound any better than it does with a cat installed. Plus, with my cat removed back in the day (and no other mods done), i got 32 on the highway at best; with the cat back on, i did a best of 39mpg. Do yourself a favor, and install atleast a shorty Magnaflow cat and call it a day.
I dont get why people remove cats from their quads then complain about the noise....*facepalm*
Geoff
95 Base V6: Current Project; Work In Progress
95 Base V6: Current Project; Work In Progress
- SuzukiGhostRider
- Registered User
- Posts: 2464
- Joined: Tue Feb 12, 2008 4:07 am
- Location: Milan NM
- Contact:
Re: Muffler Too Loud
My mileage was about the same either way. Cat doesn't really seem to affect mileage wso. Not quite sure why you noticed BETTER mileage with a Cat Geoff, but that sounds strange to me....
Re: Muffler Too Loud
Guys - thanks for the info. Will head down the path of a flow thru glass pack in the place of the cat.
As to why the cat was removed? Simple, it was shot. Not spending the extra coin for a new cat on a car that is headed to the crusher in the next 6 - 9 months. The flow thru pipe was $7.
As for the mileage difference, sorry I don't buy it. A cat does not impact mileage. If you saw a mileage difference then you had other differences in the system or calc'd something wrong. If you have found a way to get a 22% improvement in MPG with your cat installation you should market it to the OEM's. You'd be rich!
As to why the cat was removed? Simple, it was shot. Not spending the extra coin for a new cat on a car that is headed to the crusher in the next 6 - 9 months. The flow thru pipe was $7.
As for the mileage difference, sorry I don't buy it. A cat does not impact mileage. If you saw a mileage difference then you had other differences in the system or calc'd something wrong. If you have found a way to get a 22% improvement in MPG with your cat installation you should market it to the OEM's. You'd be rich!
2011 Equinox LT (daily driver)
1981 Omega Sport (waiting to be restored)
Photobucket: http://s912.photobucket.com/albums/ac324/dhenderz/
1981 Omega Sport (waiting to be restored)
Photobucket: http://s912.photobucket.com/albums/ac324/dhenderz/
- SuzukiGhostRider
- Registered User
- Posts: 2464
- Joined: Tue Feb 12, 2008 4:07 am
- Location: Milan NM
- Contact:
Re: Muffler Too Loud
Agreed, Dennis. I've NEVER heard of a Quad pulling 39mpg either. I think you made a slight miscalculation there Geoff ol' boy.