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bit of confusion on exhausts
Dan,
For $48.99 (buy it now price) who cares if #1 is filled with cotton? If you
like it buy it. It might only last a year or two but at that price why
worry? You might even get lucky and get three years out of it. Reference my
last note to you re: longevity.
Rick Alexander
'87 MKII Rolling Roc
'86 Cabbie
'81 "S" MKI G60 in progress
'80 MKI (Parts)
'73 Baja Challenge car
'65 Brubaker Box
'62 Tuff Tubb dune buggy
----- Original Message -----
From: "Dan Smith" <sad_rocc@veedub.com>
To: <scirocco-l@scirocco.org>
Sent: Tuesday, November 26, 2002 3:29 PM
Subject: RE: bit of confusion on exhausts
> 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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