Exhaust Reverberation.

[B.L.Z.BUB]

Hey guys.

 

Just got my exhaust done on my ksev and it sounds great.

 

The only issue is I am having a problem with the boot amplifying the exhaust noise inside the car.

Would filling the rear backrest with some kind of foam along with covering other solid surfaces inside the boot help? Or a solid piece of mdf between the cabin and boot. Lining the boot with carpet including the boot lid? All of the above?

 

Any ideas would be appreciated as always. Dynamat?

 

Cheers

 

Reed

[7shades]

Where does the tailpipe actually exit?

[B.L.Z.BUB]

 

Hope that helps

[7shades]

Please tell me there's a primary muffler and resonator further up the system that I can't see in the pics, or I will be forced to post a facepalm picture in your thread.

 

You'll probably find the cannon and dumpy tip are to blame... Dumpies stop exhaust noise travelling as far (outside the car) but have the exact opposite effect inside the cabin.

 

Also, straight through cannons (like that one, which looks like one of the $90 Trademe ones) suck, do nothing, and on small engines act as self contained echo chambers.

[Johno]

If you want, insead of getting a sheet of MDF, get a big thick peice of house insulation and staple it to the bcak seats or just get a loud stereo to drown out the noise :P

Edited June 15, 2010 by Johno

[Evan G]

your running a glass packed straight through muffler and a canon?

 

problem solverd

[rob83ke70]

I've got too big of a rear muffler and tip and I'm going down the path of putting a more appropriate size muffler and some different bits in the exhaust to get rid of the loud drone and reverberation.

 

I like 2" tips on corollas lol.

 

Robert.

[7shades]

I've got too big of a rear muffler and tip and I'm going down the path of putting a more appropriate size muffler and some different bits in the exhaust to get rid of the loud drone and reverberation.

 

I like 2" tips on corollas lol.

 

Robert.

 

2" is perfect, lukey mufflers sound sweet, and a resonator is a MUST.

[B.L.Z.BUB]

Has a resonator.

[mungi mods]

i should put a hotdog in further up the system , letme know, it will quieten it down slightly , be like mine

[B.L.Z.BUB]

Yeah that may help. It sounds good outside though. Ill try pad out my rear seats.

[Evan G]

one thing ive learnt is

 

fix the problem instead of trying to cover it.

 

example dynamat = $200ish?, centre muffler/hotdog = $150?

[rob83ke70]

lol evan g I wish used car departments would understand that - going back a few jobs now, I found myself fitting a $150ish "universal" power aerial to a car to replace the oem power aerial that had broken, which was $300-400ish. it took me about 5 times as long and the result was by no means satisfactory.... would have been cheaper to buy the oem part!!!

 

going back to the original issue - it can sound really sweet without having to be loud.... I'm putting the longest perforated tube resonator I can fit under mine and a 2" straight through perforated tube muffler with a 2" tip - it will be loud, but not too loud.... or so I'm hoping anyway! a big tip will always make it "boomy" and resonate too!

 

Robert.

Edited June 15, 2010 by rob83ke70

[Evan G]

lol evan g I wish used car departments would understand that - going back a few jobs now, I found myself fitting a $150ish "universal" power aerial to a car to replace the oem power aerial that had broken, which was $300-400ish. it took me about 5 times as long and the result was by no means satisfactory.... would have been cheaper to buy the oem part!!!

Robert.

 

i also work in a dealership. thats why I'm trying to give the rollaclub "do it right the first time" approach LOL

 

used cars = spend the least amount of money and demand the most

[Felix]

Probably just the cannon to blame.

 

Reverse flow mufflers are the way to go, don't even need a resonator.