Yup - WIFE IS LOUD!!! (exhaust acoustics) - ZR-1 Net Registry Forums

Schrade · 05-29-2014

Jeff was right - THis thing is LOUD!

Outside sounds great. I let a neighbor do a lap around the block after he helped lock down clamps. Sounded great driving off; I couldn't hear it on the back side of the block.

Inside is a different story. What I'm not diggin' so much is drone. It's loud between about 1,200 RPM's, to about 1,800, give or take. Gotta' be way below 40 Hz...

So I'm thinkin' on a few things here, individually, or in combination, to 'interfere' with the harmonic resonance:

1) Pipe wrap the 2 sections where the resonator was, and the X-pipe.

2) New (or additional) sound material under the carpet interior. I stayed with the original material because it 'smelled' new when I uncovered it for Black conversion.

3) Fitting / welding in a free flowing resonator behind the X-pipe (or 2 individual units, space permitting)

Where's Jeff T here; Jeff - did you consider option 3 here? Seems it would be an easy task, if a resonator could be modded for 2 x 3" inlets / outlets...

Of course, option 'b' would work too - turn up the radio

What did you do to take the edge off of interior noise, without hampering exhaust flow?

05-29-2014	#1
Schrade Join Date: Dec 2012 Location: NC Posts: 1,783	Yup - WIFE IS LOUD!!! (exhaust acoustics) Jeff was right - THis thing is LOUD! Outside sounds great. I let a neighbor do a lap around the block after he helped lock down clamps. Sounded great driving off; I couldn't hear it on the back side of the block. Inside is a different story. What I'm not diggin' so much is drone. It's loud between about 1,200 RPM's, to about 1,800, give or take. Gotta' be way below 40 Hz... So I'm thinkin' on a few things here, individually, or in combination, to 'interfere' with the harmonic resonance: 1) Pipe wrap the 2 sections where the resonator was, and the X-pipe. 2) New (or additional) sound material under the carpet interior. I stayed with the original material because it 'smelled' new when I uncovered it for Black conversion. 3) Fitting / welding in a free flowing resonator behind the X-pipe (or 2 individual units, space permitting) Where's Jeff T here; Jeff - did you consider option 3 here? Seems it would be an easy task, if a resonator could be modded for 2 x 3" inlets / outlets... Of course, option 'b' would work too - turn up the radio What did you do to take the edge off of interior noise, without hampering exhaust flow?