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2011-2014 Mustang GT Tech Forum

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Unread 04-27-2013   #1 (permalink)
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Default What's the Purpose of Resonator Delete?

See this in a few sigs...

Is this hard to do? Is it a HP gain benefit, change in exhaust "note", change in volume?
Thanks
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Unread 04-27-2013   #2 (permalink)
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If I'm not mistaken the purpose is to gain volume with slight variation in tone. Little to no appreciable gain in power. I plan on doing the resonator deletes with my svt axle backs pretty soon as I crave a little more now that I'm used to them. Should be as easy as cutting the resonators out and welding lengths of straight pipe in their places.


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Unread 04-27-2013   #3 (permalink)
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Main reason I did them is to help flow. The insides of the resonators are only about 2.2" in diameter. Plus you gain a little exhaust volume.
 
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Unread 04-28-2013   #4 (permalink)
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This thread could result in a lot of arguments! LOL!
So, to keep it to the IMHO response...
It would seem that on a otherwise stock setup, the gains are at best a couple of ponies. Removing them is usually done for sound purposes. It gives the exhaust a much more natural engine sound instead of the resonators taking the "edge" off of the engine sounds. The arguments come when it's done in conjunction to other exhaust mods. The biggest gains I've seen claimed was in one of the magazines where they added mufflers, x-pipe, and then straight pipes in that order. Surprisingly, the straight pipes help more than they thought. The total was around an additional 18HP. When stacking mods, they don't always end up as a straight math addition, 10+15 =25. It's usually more like 10+15=19 no matter if you're doing intake, exhaust or a combo of both.
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Unread 04-28-2013   #5 (permalink)
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It's like a $50 mod...even if it just helps a tiny bit, it's worth it since it's cheap.
 
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Unread 04-28-2013   #6 (permalink)
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Makes the exhaust sound a tad louder and a tad more aggressive.
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Unread 04-28-2013   #7 (permalink)
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Resos work by increasing the volume (size) of the pipe at a critical place in the exhaust stream. This slows down flow and reduces noise consequently.

We aren't talking any major gains on a stock tuned car for having them in or out, as the exhaust volume is already greater than stock tune engine needs.

Kind keep in mind, all the energy in the exhaust system comes from the various flow pulses and the power of expanding gases and it has to overcome atmospheric pressure trying to shove it back up the pipe.
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Unread 04-28-2013   #8 (permalink)
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Quote:
Originally Posted by 5POINTO View Post
It's like a $50 mod...even if it just helps a tiny bit, it's worth it since it's cheap.
That's the fun part, it's your car; do what you want and enjoy!
And don't forget to tell us how you like it! We need more positives stories from people who are enjoying themselves instead of the whining, bitchin', and complaining.
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Unread 04-28-2013   #9 (permalink)
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All these seem like some good answers. If I just added Kook's LTs and Off Road H, and I like the "sound" but not so much the "volume" then would most people agree to NOT take them off for now? Im at 400 to the wheels right now and IM putting a Roush on later in the year, so Dont really care if I got 10HP from the delete(if it even nets that). Just dont want the neighbors reporting me. I like the Loud at WOT or acceleration but not "cruising"...

Thanks
RC
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Unread 04-28-2013   #10 (permalink)
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Quote:
Originally Posted by 94GTLaserRC View Post
All these seem like some good answers. If I just added Kook's LTs and Off Road H, and I like the "sound" but not so much the "volume" then would most people agree to NOT take them off for now? Im at 400 to the wheels right now and IM putting a Roush on later in the year, so Dont really care if I got 10HP from the delete(if it even nets that). Just dont want the neighbors reporting me. I like the Loud at WOT or acceleration but not "cruising"...

Thanks
RC

I would ditch those resonators and maybe get a set of true bullet style racing mufflers. The factory resonators aren't packed (as far as I know). They just neck down. It's just a different way attenuate sound. Or if change axle backs if you have more aggressive mufflers.

GT500 mufflers, Pypes M80's. Done.
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Unread 04-28-2013   #11 (permalink)
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Quote:
Originally Posted by 94GTLaserRC View Post
See this in a few sigs...

Is this hard to do? Is it a HP gain benefit, change in exhaust "note", change in volume?
Thanks
RC
Actually, the resonators are designed to cancel out a particular frequency band of soundwaves that come from the engine. In particular, they are "higher frequency" sound waves that, if left in the exhaust waves, generate a "raspy" sound in the exhaust. They also, as was stated, somewhat reduce the sound level of the exhaust - mostly by removing the higher frequency sound waves. Some people like the "more raspy sound," others either can't tell the difference or don't care. You would never measure any performance change from their removal - but it might make the bottom of the car look nicer One thing to remember is that the entire exhaust system - from the headers to the tail pipe tip - make up one long tube that has a "natural resonance" at some frequency. At the natural frequency, the pipe begins to "resonate" - read vibrate - all along the length of the exhaust system (Just like along pipe on a pipe organ). If that natural frequency is the same as the energy pulses coming from the engine at some RPM, the result is "drone." A very loud "monotone" heard loud in the cabin (actually through the floor boards) - and will actually vibrate things in the cabin due to the sound level. FORD designs the entire exhaust system to prevent "drone." No one likes drone When you change any part of the exhaust system you "undo" the anti-drone engineering. If you are lucky - as I was with the install of the GT500 axlebacks - you won't get drone from your change. If your not lucky, you will know it the first time you drive on the highway - by the drone. Many of the "exhaust part suppliers" don't really verify the impact of their "piece" on the whole exhaust performance with respect to "drone."
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Unread 04-28-2013   #12 (permalink)
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^ You just walk around the mall looking for someone to talk to, right?
Your "you will never" and "if you're lucky" is wooonnnngggg.
Lots of different types of resonators on the market, removing a restriction will always change no matter how minute, and sound being equal...
ok, now you can talk your heart out...
Taking bets-whose got 2000 words or less response???:nogrinner
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Unread 04-28-2013   #13 (permalink)
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After I removed my resonators I got no rasp and no drone. Just a little more volume. But I do have GT500 AB's that are very deep and throaty.
 
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Unread 04-28-2013   #14 (permalink)
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Quote:
Originally Posted by Radioguy View Post
Actually, the resonators are designed to cancel out a particular frequency band of soundwaves........piece" on the whole exhaust performance with respect to "drone."


I actually have Steeda's Borla system. Just ordered GT500s AB's I love the sound of my kooks with Hpipe, but I want to have a little less volume and no drone. I think (FOR ME) leaving the resonators in and putting on the GT500 AB's should be what IM looking for.

RC
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Unread 04-28-2013   #15 (permalink)
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Quote:
Originally Posted by 94GTLaserRC View Post


I actually have Steeda's Borla system. Just ordered GT500s AB's I love the sound of my kooks with Hpipe, but I want to have a little less volume and no drone. I think (FOR ME) leaving the resonators in and putting on the GT500 AB's should be what IM looking for.

RC
What are you running now? Steeda's Borlas? It seems a lot of people want to tone down headers and H pipe combos. That H pipe boost the bass, not necessarily what some are looking for. An X pipe will quiet it down a little.
For the resonators, look for a shop called Allen's. they make their own resonators. You can get some 2.5s or 3" in/outs stainless or aluminized with louvered baffling that does a great job at cutting the nasty out and still maintaining great flow. They also have the standard flat pipe with holes but they work more on over pressure. They are made in the USA and can be bought for usually less the $100 for 2 in sizes between 6"-30" depending on how much you want. Let me know if you can't find them.
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