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Exhaust mods to reduce noise 

 

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 Post subject: Exhaust mods to reduce noise
Posted: Fri Dec 29, 2006 9:36 am 
Getting Side Ways
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Just been doing some "research" at work and came across these: http://autospeed.drive.com.au/cms/article.html?&A=0883

They are a type of wastegate/throttle plate type assembly that run off vacuum and run inline with your exhaust system. When the vaccuum is low the flap shuts blocking off a lot your exhaust gases creating back pressure and when on boost the flap opens all the way like a throttle body would making the exhaust free flowing.

Has anybody seen these in use before or know how useful they are? My car was way too loud before with a 3 inch exhaust, single muffler and resonator. Im after a sleeper effect and would love to quieten it down a lot.

Ive also seen similar products which redirect flow to the atmosphere on boost but I can only imagine the consequences when a cop finds it.

Alternatively what is the best way to make an exhaust quiet without restricting power too much?

Are more expensive mufflers better than cheaper ones at reducing noise levels while maintaining good flow?

I have no idea what type of muffler my car has now.

What are some good brands to look for? What are you using and is it very loud?

I want to be as quiet as possible but still make good power.
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Posted: Fri Dec 29, 2006 4:55 pm 
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i have 3.5" dump, 3.5" cat and a single mandrel bent 3" system with one lukey muffler. its not really that loud but it not really quiet.

Brenden mock has a 3" dump, 3" cat and 3" system with 2 mufflers and a resinotor. but he is running sum stupid size turbine housing, i think it was a 1.75A/R single pulse t04z

 

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Posted: Fri Dec 29, 2006 10:28 pm 
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I first saw these years ago on Autospeed or in Zoom..? Or both?
Can be setup to work on a NA car also. From memory there is a manual override so you can manually open the flap all the way at the flick of a switch. I'll try to find the article where they fitted one to a project car.

 

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Posted: Sun Dec 31, 2006 12:42 am 
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Just use as many straight through mufflers you can...Or do what car makers do.. Fit twin " exhaust in tail pipes... Ala WRX and most V6 engined cars...

 

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Posted: Fri Jan 05, 2007 10:34 pm 
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i talked to the guy who invented those Actice Exhaust Controls for bout 50 min the other day, very help ful. he sent me a heap of info on them ill post it wen i get time, but there fairly exsspencive but. think bout $900 or sumthing!!
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 Post subject: Make More Noise
Posted: Fri Jan 05, 2007 11:15 pm 
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More Noise So the falcon Can Be Heard

 

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Posted: Fri Jan 05, 2007 11:19 pm 
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the jap cars use these...

i think there is a hks one which is adjustable from in the cabin

 

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Posted: Fri Jan 05, 2007 11:23 pm 
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Asian Zorst System haha wadda joke aye

 

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 Post subject: Re: Make More Noise
Posted: Fri Jan 05, 2007 11:30 pm 
Getting Side Ways
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Falcon96kickass wrote:
More Noise So the falcon Can Be Heard


yeah awesome :roll:

Ill check it out phibz.

Cheers,
Dan
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Posted: Sat Jan 27, 2007 7:49 pm 
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Get an Apexi EVC - Exhaust valve controller about $200, and for an extra $400 you can get an Apexi DECS - which electronically controls the flap and can be programmed for certain rev ranges.

 

 

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Posted: Sun Jan 28, 2007 2:08 pm 
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QUOTE

"Just use as many straight through mufflers you can..."

I've worked for two of the bigger names in exhaust and agree with EBRX8380.

The best way to reduce noise without restricting exhaust flow is by using the largest volume mufflers you can fit under the car.

Both of the companies I worked for offered two styles of baffling in their mufflers:

Absorption: Straight through with the baffle tubes wrapped in sound absorbing material like stainless steel wool or fibreglass matting.

Mechanical, or reverse-flow baffling. This is where the exhaust gas is directed through a number of chambers.

Contrary to poular myth, well designed reverse-flow baffling is not as restrictive as many would have you believe. Especially in the size-range that would interest most of us.

When you buy mufflers, check that the size of the nipple (inlet and outlet tubes) match the interior size of the baffles. Many of the cheaper mufflers use the same core and simply change the nipples.

I have seen three-inch mufflers that were barely two-inch in diameter through the core.

When Genie offered complete systems for E-series Fords, the tubing was 2-1/2" OD. Testing proved that smaller or larger tube was counter productive to performance. Bare in mind that all testing was done on naturally aspirated, stock cars.
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Posted: Sun Jan 28, 2007 2:40 pm 
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corvette c6 uses this too i think. i have limited knowledge on it tho but i know it uses butterfly valves in the zorst so it restricts flow at lower revs
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Posted: Sun Jan 28, 2007 3:49 pm 
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There is a turbo genie muffler on jay's car which i rekon makes it sound sick as!

 

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Posted: Sun Jan 28, 2007 5:13 pm 
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I dont want my car to sound "sick as". Sick noises are for teenagers who dont know any better.

Thanks for the advice guys. Car should be on the road within in the next month so Ill experiment with different mufflers then.

Cheers,
Dan
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Posted: Sun Jan 28, 2007 8:19 pm 
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By sick as i meant nice quiet idle which opens up to an awesome growl as u hit the throttle. Dont call me a "teenager who doesnt know better." Just coz ur an old C*** who thinks he knows everything. d**k head

 

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