exhaust

[Schrade]

Originally Posted by XfireZ51

I would try some styrofoam or foam over the top of the spare tire so that it deadens any resonance of the hatch floor. Could it be that the spare tire carrier creates a BOOOM Box under the hatch floor?

That's a good idea - have to look into that, when I run pipe wrap further back.........

[alnukem]

Originally Posted by XfireZ51

I started out w 1 7/8" Watsons w 3G B+B. DRONE.
Went to headers w MagnaFlow 3" Cat-Back including resonator. Nice exhaust but more restrictive although it still made 399rwhp.
Now my final configuration is headers, SW Xpipe, DynoMax UltraFlows w
NPP Z06 tips and full open on/off switching. This is the exhaust I'm sticking with.

I have this same system with the exception of the switch, mine is just controlled by engine vacuum, in low vacuum situations like accelerating, it opens. It is awesome but people tell me it's loud, I guess too many years in the gun business!

[edram454]

finally put the new flowmaster original series 40 on my car. there is a difference in sound especially at idle. car sounds much better and throatier. There is more drone during certain rpms but if it gets too bad I can shift up or shift down and get out of the drone zone. wot is very nice. Not as raspy as the corsa but deep and loud especially out the back. I bought the flowmaster ss dual tips and they look ok. they look like the corsa but it is one into two. I wish they were bigger (3 inch each tip,,two per side) but it doesnt look bad.

Unfortunately I saw where a guy in the corvette forum just listed his used corsa system for 900 dollars after I had already bought the mufflers and tips. You never know. I am satisfied with the outcome and the car does sound much more muscular. I didnt spend 900 either. 77 per muffler and 60 per tip. Not bad.

ed ramos #3028

[WARP TEN]

Originally Posted by XfireZ51

I would try some styrofoam or foam over the top of the spare tire so that it deadens any resonance of the hatch floor. Could it be that the spare tire carrier creates a BOOOM Box under the hatch floor?

Hi Dom--
Many years ago when I was testing a Power Effects system (lots of resonance!) and researching our resonance problem in general I actually had an acoustical engineer (ironically from Outboard Marine) instrument my car and evaluate the causes and suggest a solution. He developed graphs showing precisely what RPM and frequencies the two main resonance points were and showed calculations required to make a Helmholz resonator for each of the offending frequencies, which of course is what the stock and Corsa systems use.

They also researched whether it might involve something like you mentioned called "cavity resonance". Meaning it is enhanced or diminished by the cabin itself (or maybe the tire carrier?). I had asked because it seemed less with the top off. Their conclusion was that it was not cavity resonance but solely caused by the exhaust and the natural harmonics of the engine. It seemed to be less with the top off only because it was generally noisier with it off and it was therefore not as noticeable. --Bob

[edram454]

anybody have headers, no cats and resonators removed??? maybe looking for more noise. Anybody?? I dont care about drone. dont drive it much.

[XfireZ51]

Originally Posted by edram454

anybody have headers, no cats and resonators removed??? maybe looking for more noise. Anybody?? I dont care about drone. dont drive it much.

That's my setup. In place of resonator, I'm using the C6Z06 tips with NPP controls. Also using SW Xpipe fully open. But I have tuned most of the drone out.

[edram454]

so you control yours with the adjustable c6z06 tips. If its wide open do you find it unbearable or just loud. I want to make a presence. I dont drive it much but when I do I like to know I am driving something special. I drive a Lincoln Town Car for my daily commute and i love that but I want the polar opposite when I get in my z. I want it to really sing at wot. does yours howl with your tips open at wot?? I am considering adding an x pipe and removing my resonators. It sounds good now but want more at wot.

[XfireZ51]

Originally Posted by edram454

so you control yours with the adjustable c6z06 tips. If its wide open do you find it unbearable or just loud. I want to make a presence. I dont drive it much but when I do I like to know I am driving something special. I drive a Lincoln Town Car for my daily commute and i love that but I want the polar opposite when I get in my z. I want it to really sing at wot. does yours howl with your tips open at wot?? I am considering adding an x pipe and removing my resonators. It sounds good now but want more at wot.

Mike100 has a greater range of adjustment for the Z NPP tips. Mine is setup where I can turn them open or closed. Normally I drive w them closed but when I drive by a "ricer" I flip a switch in the console and blast both tips. If I am in a competitive situation I flip the switch and I have open exhaust. The tips are on DynoMax UltraFlow w 3" inlet. Frankly it's pretty amazing how the exhaust sounds w no resonator. WOT sounds like an old Quadrajet carb opening up. Not at all raspy like the Corsa. It has a very low deep note sounding a bit like a big block.

[alnukem]

Originally Posted by edram454

anybody have headers, no cats and resonators removed??? maybe looking for more noise. Anybody?? I dont care about drone. dont drive it much.

They say the old B&B triflow with x-pipe is the loudest! Or, you could use any system & electric cutouts.

[KILLSHOTS]

Originally Posted by edram454

anybody have headers, no cats and resonators removed??? maybe looking for more noise. Anybody?? I dont care about drone. dont drive it much.

As I mentioned earlier, I tried this deal where I continued to adjust the exhaust again and again and again, thinking that each incremental adjustment was inexpensive and therefore, it wasn't costing me anything. It never panned out. The final result sounded good but there was too much drone and I couldn't leave the house early in the morning without pissing off the neighbors. I found that you can't "have it all" without biting the bullet and investing in the expensive system...that one that has had countless R&D dollars dumped into it.

Ed, I wish you luck in your search and I hope you find the magic combo that nobody else has ever found.