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bit of confusion on exhausts

Subject: bit of confusion on exhausts
From: flaatr@yahoo.com (Euroroc II)
Date: Tue, 26 Nov 2002 16:47:43 -0800
In-reply-to: <F132Xv3ZLcDgpAJ2OWE00010603@hotmail.com>
I've been thru a few mufflers including Flowmaters and a Dynacrap.... Borla 
is now my favorite! I have a TT stainless 2.25" with a resonator and a 
stainless steel dual tip, the tip I have yet to install...

Don't know about Remus except they are very expensive.... they look good 
but don't know about the sound on a Volkswagon.... I see them on BMW's a lot

-RGK-

At 09:09 PM 11/26/02 +0000, Chris DeLong wrote:
>Ok well i didtn take the time to look at the links. Shoot me. anyway from 
>my experience this is what I have found in mufflers that last a long time
>
>1. Remus, low growl, long life, very heavy, very expensive
>2. Borla, a little louder but still pretty nice, not so expensive as the 
>Remus and alot lighter
>3. Flowmaster, very loud, ricey sounding, cheap, will last a long time, 
>lighter than the above mentioned mufflers
>
>
>
>Chris DeLong
>ICQ#45030867
>Seattle, WA USA
>'80 16V 'Rocco ragtop
>'91 GLi 2.0 16V
>'77 Rabbit 16V
>'80 'Vert (parting out!)
>'61 17 Window type II
>'91 Vanagon
>'78 Rabbit
>'84 Jetta
>
>
>
>
>
>>From: Dan Smith <sad_rocc@veedub.com>
>>Reply-To: sad_rocc@veedub.com
>>To: scirocco-l@scirocco.org
>>Subject: RE: bit of confusion on exhausts
>>Date: Tue, 26 Nov 2002 12:29:18 -0800 (PST)
>>
>>Well, I don't know why I didn't think of this before, but does anyone 
>>have good aftermarket muffler reccommendations? I'm looking for something 
>>along the lines of low purr/growl as opposed to high, annoying buzz. I 
>>have some Audi muffler on now and it doesn't sound like much at low rpms 
>>but when I step on it and get into the higher rpms its got a really nice, 
>>deeper hum. Here is what I'm looking at for mufflers. I'm going more for 
>>looks and sound than performance.
>>1. 
>>http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=33636&item=1873521173&rd=1
>>2. 
>>http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&category=6771&item=1873503132&rd=1
>>3. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=1873400152
>>
>>I prefer 2 and 3 because I know how the exhaust travels in them and I 
>>know what's inside, where as #1 could be stuffed with cotton for all I 
>>know. Also, 2 and 3 are straight through. 2 has the typical canisters on 
>>rice cars which makes me leery of the fartcan sound but 3 is a bit expensive.
>>
>>Dan
>>--- "Joe Doty" <rocco2nr@hotmail.com> wrote:
>> >I totally agree on the backpressure being a myth thing.  I think it's a
>> >word made up by people who don't know what the hell is going on.
>> >
>> >I don't think you have to worry about losing low end, if that's what
>> >you're stressing.  However I would recommend getting at least one
>> >resonator to avoid the fart can sound....its tough to make a free
>> >flowing 4 cyl exhaust sound good.
>> >
>> >Joe Doty
>> >IT/Development
>> >joe@lcnetwork.com
>> >
>> >-----Original Message-----
>> >From: Dan Smith [mailto:sad_rocc@veedub.com]
>> >Sent: Tuesday, November 26, 2002 11:40 AM
>> >To: Ryan H; scirocco-l@scirocco.org
>> >Subject: Re: bit of confusion on exhausts
>> >
>> >Well, that makes sense. For more info, the TT exhaust is 2.25", the
>> >muffler is 2.5" inlet, dual 3" outlets. (God I hope it doesn't sound
>> >like a fartcan) It seems velocity would be the same as in a stock setup,
>> >as the sizes aren't changing, just the restrictions, or lack of. Am I
>> >correct? And do others agree that backpressure is a myth?
>> >
>> >Dan
>> >
>> >--- Ryan H <rhock99@epix.net> wrote:
>> >>I can't answer your question about your exhaust, but I can offer my
>> >knowledge on back pressure...
>> >>This is a big myth... from what I have read, you don't want ANY
>> >backpressure, you want exhaust gas velocity.  The reason people think
>> >you need backpressure is simple: If your engine only generates 250 cfm
>> >of exhaust gases, and you have a 3.5" exhaust, the exhaust has so much
>> >room when it makes it to your 3.5 inch pipe, that it has no need to move
>> >further down the pipe, and it creates a sort of wall.  This causes
>> >exhaust gas velocities to slow, and interferes with the ability of the
>> >exhaust system to "scavenge" exhaust gases from the engine when the
>> >exhaust valves are open.  This means the engine has to force exhaust
>> >gases out the valves, instead of it being sucked out by the exhaust
>> >system, and this is where systems with "too little backpressure" (in
>> >truth, exhaust gas velocity) lose their power.
>> >>I guess it would take some experimentation on your part to see what
>> >allows your car the maximum exhaust flow rate.
>> >>
>> >>>
>> >>> From: Dan Smith <sad_rocc@veedub.com>
>> >>> Date: 2002/11/26 Tue PM 01:59:12 EST
>> >>> To: scirocco-l@scirocco.org
>> >>> Subject: bit of confusion on exhausts
>> >>>
>> >>> I have a stock 1.8l 16v, which hopefully at some point will change.
>> >I've been looking into an aluminized TT setup with no resonator and
>> >swapping the muffler for a fireball dual tip straight-thru design. I've
>> >heard though that you want some backpressure and if your exhaust is too
>> >free flowing, then you actually lose power. What exactly is the real
>> >deal on this? And would this setup be too free flowing? Suggestions,
>> >comments, ect.
>> >>>
>> >>> Dan
>> >>>
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>> >>
>> >>
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References:
- bit of confusion on exhausts
  - From: green536@hotmail.com (Chris DeLong)
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