Pick a time and place. I'll report back. Later in the evening preferred; I work in west LA and I don't like driving home in traffic

For the record, I've also offered to swap exhaust for a test drive with the EVS exhaust on my car (CR; no sound deadening), which was turned down for the time being.

If it does indeed drone, you'll all know about it.

 

I understand the tailpipe portion of it and I understand that by using a venturi, you can maintain exhaust mass flow using a proper diffusion rate. I'm not quite sure how large the inner diameter is on the Ti-C silencer, but I think it is very small with no venturi effect at the tip which causes a disturbance in flow. I understand that part. Not quite sure what you mean by a "wall" though. Perhaps the attenuation of the resonance is due to changing the wave amplitude by decreasing the tailpipe inner diameter? I am interested in this.

I'm waiting for greatfox to followthrough with psychoazn's offer. I don't see why we should continue to try and discredit this guy as he is attempting to prove a point. I am just unconvinced about this issue so it requires a second opinion and install of his personal exhaust to figure out if that particular exhaust has an issue. He may have gotten a lemon. Who knows? I'm waiting for psychoazn's review of it.

 

You will be in for a quite ride hahaha. Even might fall asleep. But if greatfox rides in my car he might need ear plugs. I get more wind then drone.
http://www.youtube.com/watch?v=8GmyD...eature=related

 

here's a try to show you the difference:

Greddy Turbo Ti-c single:
[attachment=15251:Greddy Ti-C muffler.jpg]

you can see that a part of the ex. gases is reflected back into the muffler by the "wall" of the silencer
there's no smooth passage into the tail pipe

here my GReddy SE single modified with the venturi pipe:
[attachment=15252:Greddy SE muffler.jpg]

there's a restriction, but nearly no reflections - so i would say no noticeable backpressure
the SE has a double walled tail pipe with absorber (perforated tube in tail) - this makes a bigger, louder tone
with the venturi this is much better and the tone is less deep


when i look at the EVS, i would say that the 67mm muffler outlet leads into a approx. 90mm pipe @ the tail

i would try to let the 67mm pipe pass through the tail with this venturi design, so we will have no restriction, but surely a higher tone, respectively less drone

but regardless to this i would say that this helmholtz resonator on the EVS ex. should kill the deep drone frequency.
no other ex., except the ASM siren has this stuff and i think this must work

more reviews please

 

Is this a 70mm version of asm siren circuit? Never thot of that, that's interesting.

Dallas id be interest in hearing yours, you can hear my mugen dual if you like lol

I work in bh and live in 626

Sent from my T-Mobile G2 using Tapatalk

 

Thanks for the clarification. The theory makes sense now. It's probably more useful to try on other systems. Again, the resonators on the EVS make me curious why the exhaust would drone that badly. Waiting for more reviews to clarify this issue.

 

perhaps it is really the tail pipe
the muffler outlet is probably 67mm and the tail pipe is 90mm
this is a huge difference in dia. which causes a deeper tone and maybe droning too

don't know why no exhaust manufacturer makes the tail pipe dia. equal to the main pipe dia. ?
maybe the deep tone is desired, but the droning surely not
and ok, a 70mm tail pipe looks very poor on a S2000

 

My tail pipe is 70mm....

 

which exhaust do u have?

 

Greatfaux, there you go exaggerating again. The super single clutches only chatter during clutch engagement - when you compress the clutch pedal. It doesn't make any chattering noises during idle or driving conditions. The Ducati dry-clutch constantly chatters during idle.