Exhaust Resonator Question - ZR-1 Net Registry Forums

Johnny5 · 02-26-2015

On my previous 1994 LT1 i deleted the resonator which gave a deeper rumble in the exhaust (sounded very nice). I was thinking of doing the same with my 91 ZR1. Doing this won't throw any codes will it? (the service manual says replacement of resonator assembly will require replacement of both mufflers) And has anyone tried this yet and kept the stock mufflers? How does it sound? I originally wanted to put a corsa on but I'm waiting to do my tuneup first....injectors, coil packs. wires, fuel filter and maybe the fuel pumps.

GOLDCYLON · 02-26-2015

Quote:

Originally Posted by Johnny5

On my previous 1994 LT1 i deleted the resonator which gave a deeper rumble in the exhaust (sounded very nice). I was thinking of doing the same with my 91 ZR1. Doing this won't throw any codes will it? (the service manual says replacement of resonator assembly will require replacement of both mufflers) And has anyone tried this yet and kept the stock mufflers? How does it sound? I originally wanted to put a corsa on but I'm waiting to do my tuneup first....injectors, coil packs. wires, fuel filter and maybe the fuel pumps.

No it wont throw any codes a lot of folks have went to x pipes and switched out the exhaust as well. However you will pick a resonance issue between 1200-1800 RPMs.

I also a spare Corsa resonator if your interested.

KILLSHOTS · 02-26-2015

That was my "STEP 1". I didn't notice any difference. I'm in the minority, though, as a couple of other guys have done the same thing and really liked the extra rumble. My advice: remove the resonator AND the mufflers...it sounds amazing!

WARP TEN · 02-26-2015

Goldcylon is right. The ZR-1 engine has pronounced natural resonance at two rpm points, about 1800 and about 3400. I believe he is right that the center resonator handles the 1800 rpm frequency and the mufflers handle the 3400 rpm frequency, although it might be the reverse; can't remember. Both contain what are known as Helmholtz Resonators, essentially empty containers specifically sized to damp down the resonant frequencies at those rpm points. Deleting the stock 91 resonator should provide a modest performance gain as the early resonators were quite restrictive. See Marc Haibeck's website to more on that.--Bob

Johnny5 · 02-26-2015

Quote:

Originally Posted by GOLDCYLON

No it wont throw any codes a lot of folks have went to x pipes and switched out the exhaust as well. However you will pick a resonance issue between 1200-1800 RPMs.

I also a spare Corsa resonator if your interested.

How much did you want for it? And whats the difference if i just get meineke to weld an x pipe?

Johnny5 · 02-26-2015

Depending on the price welding thr nex x pipe or resonator i may just buy a used corsa or new obx after i fix my fuel issue. I want it to have a nice deep rumble but not too loud. I love the way my brothers 04 Z06 sounds (stock titanium mufflers).

GOLDCYLON · 02-26-2015

Quote:

Originally Posted by Johnny5

How much did you want for it? And whats the difference if i just get meineke to weld an x pipe?

PM Sent. The difference is you will pick up significant resonance and your exhaust will be louder. The CORSA resionator flows better than stock and you wont have the resonance issue.

mike100 · 02-26-2015

I've done it and it sounds good. Still has 90 percent of the factory designed non resonating easy going exhaust sound with a little more growl. I think the mufflers have the bulk of the restriction, but maybe there is a few hp in the resonator also.

Once you take the factory mufflers off though...oh boy does it get loud. You need to have a single outlet muffler scheme to keep it reasonable.

max76 · 02-26-2015

I'll like to put an x pipe on my b&b exhaust...the sound is amazing, I love it!!!
Someone have a used 3" x pipe?

edram454 · 02-27-2015

the resonator is a power robber. I had a flowmaster force II system and I removed the resonator and the large 3 chamber mufflers and just placed 2 2chamber old school flowmaster 40 series with minimal obstruction. It is very loud. It has mind numbing resonance but I feel much more power and free revving unlike before. the resonator also weighs a ton along with those large stock mufflers. I cut the weight and greatly reduced back pressure. My z sounds very nasty, way nastier than those ls motor cars. when the secondaries open all hell breaks loose. I dont drive it much but when I do I like to be noticed and I am!!

ed ramos #3028

02-26-2015	#1
Johnny5 Join Date: Nov 2014 Location: New Jersey Posts: 363	Exhaust Resonator Question On my previous 1994 LT1 i deleted the resonator which gave a deeper rumble in the exhaust (sounded very nice). I was thinking of doing the same with my 91 ZR1. Doing this won't throw any codes will it? (the service manual says replacement of resonator assembly will require replacement of both mufflers) And has anyone tried this yet and kept the stock mufflers? How does it sound? I originally wanted to put a corsa on but I'm waiting to do my tuneup first....injectors, coil packs. wires, fuel filter and maybe the fuel pumps. Last edited by Johnny5; 02-26-2015 at 09:25 AM.

02-26-2015	#4
WARP TEN Join Date: Apr 2007 Location: Lake Bluff, IL Posts: 2,094	Re: Exhaust Resonator Question Goldcylon is right. The ZR-1 engine has pronounced natural resonance at two rpm points, about 1800 and about 3400. I believe he is right that the center resonator handles the 1800 rpm frequency and the mufflers handle the 3400 rpm frequency, although it might be the reverse; can't remember. Both contain what are known as Helmholtz Resonators, essentially empty containers specifically sized to damp down the resonant frequencies at those rpm points. Deleting the stock 91 resonator should provide a modest performance gain as the early resonators were quite restrictive. See Marc Haibeck's website to more on that.--Bob __________________ 2016 Long Beach Red Z06 #10281 "POPS Z" 1995 Polo Green #409 "WARP TEN"--Haibeck 350/510 package, 4.10s, Hurst, Stock Exhaust with QTP Cutouts --Sold but still running strong 1993 Quasar Blue #161 "HIL KING" --Sold but still running strong, now with more than 120,000 miles 1967 Marlboro Maroon/Saddle Corvette Coupe 300 hp/4-spd --Sold a long time ago ZR-1 Net Registry Founding Member #95 NCM Lifetime Member Favorite Quote--Attributed to Mickey Thompson: "Too Much Horsepower is Almost Enough" Last edited by WARP TEN; 02-26-2015 at 11:55 AM.

02-26-2015	#6
Johnny5 Join Date: Nov 2014 Location: New Jersey Posts: 363	Re: Exhaust Resonator Question Depending on the price welding thr nex x pipe or resonator i may just buy a used corsa or new obx after i fix my fuel issue. I want it to have a nice deep rumble but not too loud. I love the way my brothers 04 Z06 sounds (stock titanium mufflers). Last edited by Johnny5; 02-26-2015 at 12:38 PM.

02-26-2015	#8
mike100 Join Date: Feb 2011 Location: San Marcos CA Posts: 1,802	Re: Exhaust Resonator Question I've done it and it sounds good. Still has 90 percent of the factory designed non resonating easy going exhaust sound with a little more growl. I think the mufflers have the bulk of the restriction, but maybe there is a few hp in the resonator also. Once you take the factory mufflers off though...oh boy does it get loud. You need to have a single outlet muffler scheme to keep it reasonable.

02-26-2015	#9
max76 Join Date: Apr 2009 Location: ITALY Posts: 264	Re: Exhaust Resonator Question I'll like to put an x pipe on my b&b exhaust...the sound is amazing, I love it!!! Someone have a used 3" x pipe?

02-26-2015	#3
KILLSHOTS Join Date: Feb 2014 Location: AZ Posts: 860	Re: Exhaust Resonator Question That was my "STEP 1". I didn't notice any difference. I'm in the minority, though, as a couple of other guys have done the same thing and really liked the extra rumble. My advice: remove the resonator AND the mufflers...it sounds amazing!

02-27-2015	#10
edram454 Join Date: Nov 2013 Location: .. Posts: 693	Re: Exhaust Resonator Question the resonator is a power robber. I had a flowmaster force II system and I removed the resonator and the large 3 chamber mufflers and just placed 2 2chamber old school flowmaster 40 series with minimal obstruction. It is very loud. It has mind numbing resonance but I feel much more power and free revving unlike before. the resonator also weighs a ton along with those large stock mufflers. I cut the weight and greatly reduced back pressure. My z sounds very nasty, way nastier than those ls motor cars. when the secondaries open all hell breaks loose. I dont drive it much but when I do I like to be noticed and I am!! ed ramos #3028 __________________ EDRAM454 1990 #3028..siamese ported plen/hous/SGC/fidanza/DRM LTHeaders/DRM roll cage/camber rod/drilled slot rotors hawk track pads/grand sport calipers/full corsa exhaust/Hurst/NO cats/custom SGC chip/cbeamplate/315's on all 4/intake water plugged/smog removed..RC injectors/LED lights..SHOULD NOT HAVE PUT ALL THE MONEY IN IT.. SOLD.