RESONANCE
Thread Starter
Instructor
Joined: Sep 2002
Posts: 137
Likes: 0
From: Toa Baja Puerto Rico
RESONANCE
My 87 Coupe was in dire need of new mufflers and rear Y-pipe. The passenger's side muffler had a big hole in it and the Y-pipe had numerous holes in it. It sounded like a muffler-less Harley. BUT NO RESONANCE!!!!!!!
I ordered from Mid America Motorworks a Dynomax
Y-pipe with balance tube and a set of Dynomax Performance Mufflers (Part Number 603-406). It was easy to install and they sound good. BUT.......the resonance is killing me. From 1600 to about 2200 rpm it is unbearable.
My car is practically stock with only a few mods: KN filter, cut lid, coolant bypass, Hypertech Thermomaster chip, TB airfoil, no cats, 3:07 rear end. It is an automatic, by the way.
What can be done to reduce this nasty resonance?
I ordered from Mid America Motorworks a Dynomax
Y-pipe with balance tube and a set of Dynomax Performance Mufflers (Part Number 603-406). It was easy to install and they sound good. BUT.......the resonance is killing me. From 1600 to about 2200 rpm it is unbearable.
My car is practically stock with only a few mods: KN filter, cut lid, coolant bypass, Hypertech Thermomaster chip, TB airfoil, no cats, 3:07 rear end. It is an automatic, by the way.
What can be done to reduce this nasty resonance?
Team Owner
Joined: Sep 2001
Posts: 62,137
Likes: 1,727
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Re: RESONANCE (alfonso gomez)
You may want some Dynomat shielding for the rear compartment area, you can get a crossover pipe welded into the Y, you can add exhaust tips that go past the bumper, or you can plug up one pipe on each side when you get on the hwy.
Otherwise, youll either have to live with it (likely) or change to a different exhaust that you can stand better.
Otherwise, youll either have to live with it (likely) or change to a different exhaust that you can stand better.
Burning Brakes
Joined: Jul 2002
Posts: 871
Likes: 0
From: Costa Mesa CA
Re: RESONANCE (alfonso gomez)
I got lucky I think...
I got the muffler Eliminators and I just let the muffler shop install them. When I picked up the car, the tips stuck out about 4" past the bottom lip of the bumper. I didn't like it at first but there's no resonates at all and the look grew on me.
Also, when I put in new rear carpets, I left old carpet in and put the new over it on the flat area. Since I did the carpets first before the Eliminators, I don't know if it contributes to the cure or not.
BIG JIM
I got the muffler Eliminators and I just let the muffler shop install them. When I picked up the car, the tips stuck out about 4" past the bottom lip of the bumper. I didn't like it at first but there's no resonates at all and the look grew on me.
Also, when I put in new rear carpets, I left old carpet in and put the new over it on the flat area. Since I did the carpets first before the Eliminators, I don't know if it contributes to the cure or not.
BIG JIM
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Joined: Oct 2000
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Re: RESONANCE (BIG JIM 54)
I got lucky I think...
I got the muffler Eliminators and I just let the muffler shop install them. When I picked up the car, the tips stuck out about 4" past the bottom lip of the bumper.
I got the muffler Eliminators and I just let the muffler shop install them. When I picked up the car, the tips stuck out about 4" past the bottom lip of the bumper.
Intermediate
Joined: Apr 2004
Posts: 41
Likes: 0
From: Old Forge PA
Re: RESONANCE (MaddMaxx)
Do you have a brand name for the plugs you used? Doesn't the rubber melt in the plugs? Also, how did you find 3 1/2"? I have Magnaflows on my 93 and would like to kill a little resonance if I can.
[Modified by jbabk, 8:16 PM 6/30/2004]
[Modified by jbabk, 8:16 PM 6/30/2004]
Melting Slicks
Joined: Dec 2001
Posts: 2,049
Likes: 0
From: Texas
Re: RESONANCE (alfonso gomez)
With the resonator on, my Tri-Flo didn't have any exhaust 
Others will disagree though, my car's........... kind of out there in it's own little world.
Good luck with your search!
Others will disagree though, my car's........... kind of out there in it's own little world.Good luck with your search!