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Old 01-07-2008   #1
1990 quasar blue
 
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Default Headers = resonance?
Title says it all. I had a Flowmaster cat-back and stock manifolds. Sounded great outside and quiet inside. Added headers and random tech cats, now it sounds incredible outside but I picked up a fair amount of resonance around 1800 rpm's. From everything that I ever read, I didn't think headers would make it resonate. Guess I was wrong. Corsa anyone?
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Old 01-07-2008   #2
GOLDCYLON
 
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Default Re: Headers = resonance?
Quote:
Originally Posted by 1990 quasar blue
Title says it all. I had a Flowmaster cat-back and stock manifolds. Sounded great outside and quiet inside. Added headers and random tech cats, now it sounds incredible outside but I picked up a fair amount of resonance around 1800 rpm's. From everything that I ever read, I didn't think headers would make it resonate. Guess I was wrong. Corsa anyone?
What headers are you running?
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91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

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Old 01-07-2008   #3
1990 quasar blue
 
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Default Re: Headers = resonance?
SSW.
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Old 01-07-2008   #4
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Default Re: Headers = resonance?
I wonder if a set of corsas would mellow them out some? Your not running a resonator correct?
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91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

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Old 01-07-2008   #5
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Default Re: Headers = resonance?
The Flowmaster has a resonator built in. When the exhaust shop welded everything up they had to shorten the cats as well as the inlet pipes to the mufflers. I know I'm grasping at straws there but, the whole thing seems strange.
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Old 01-07-2008   #6
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Default Re: Headers = resonance?
Quote:
Originally Posted by 1990 quasar blue
The Flowmaster has a resonator built in. When the exhaust shop welded everything up they had to shorten the cats as well as the inlet pipes to the mufflers. I know I'm grasping at straws there but, the whole thing seems strange.
Hmm dont know... but at some point im about to do the same thing with a set of Jeals and a corsa system. I would hope to not pick up any resonance either.
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91 WHITE/BLACK #2014. 380 P&P&PCed,Ported Heads, Jeal Long tubes, Corsa Exhaust/FIKSE FM-5s /LED TLs, LED Headlights, Front Wilwood 6 piston narrowlite calipers and rear Wilwood caliper street shop mod,CNCed Coolant Pipes,TPI Cvr,Filter cover,Stainless Bolts, DRM/DOM PROM /ZFDOC mod build #102,DRLs,BMAD with stainless Debris Screen,Coplan Air Blaster, Pioneer APP Radio 4,Brey-Krause HB,Sub Bar,Fire extinguisher seat mount,DRM Coilovers,LEDs everywhere,Compass mirror (orange),V1 DIC hidden display, Homelink sun visor, Carbon Fiber top x3 and APSIS Carbon Fiber interior, APSIS CF Steering Wheel/NAPA Leather, Banski trailing arms, Guldstrand front suspension,urethane bushings from Prothane (total suspension) ZFDoc drive shaft safety loop, raptor shift light (orange),AO engineering louver front plate, Console seat cushion, 96CE seats with black custom Sheepskins, ss billet catch can,Viper remote entry/alarm,Cragar Rear Louvers,LED side louver lights, Dewitts Radiator with SPAL fans and a Woods 160 T-Stat

90 RED/BLACK #2794. 4L60e Automatic Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless Headers, Corsa Exhaust, SAN Secondaries and Haibeck PROM, Exotic Muscle Coil overs, LED Interior Lights, LED Tail Lights, LED Headlights, 94 Sport seats with black custom Sheepskins , Cragar rear louvers, GS Front calipers, Banski Trailing arms, APSIS Carbon Fiber steering wheel, Front and Rear Baer Eradispeeds, DRLs, Guldstrand front suspension,urethane bushings from Prothane (total suspension), Dewitt's Raditor with Dual SPAL fans and a Haibeck 170 T-Stat

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Old 01-08-2008   #7
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Default Re: Headers = resonance?
Quote:
Originally Posted by 1990 quasar blue
I know I'm grasping at straws there but, the whole thing seems strange.
once you have it, can be a real PIA to get rid of, if you can do anything about it at all. not what you want to hear, i know. i've built a bunch of different headers & to a lesser extent complete system's with a fabricator friend of mine for engines i've built. to say your scenario seems strange, that's just the beginning of the whole exhaust world. IMO the most mis-understood piece of the higher performance food chain. very few, if any absolutes. it's kinda a moving target to a degree. in closing i will say the vast majority of individuals still go too big & that for sure will not help resonance, again IMO.
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