You are absolutely right Andy. It's call scavenging. That's why there's a
fine line when you start messing with headers and cats and exhausts. People
don't understand why you can't just put a 6" pipe all the way through and
get 1,000 hp. The explanation of what you just said is very complex. If I
find the write up, I'll put it on the list.
Ron
00 SLT QC 4X2 5.9 46RE 3.92 LSD
For modifications see my DML Profile
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net]On Behalf Of Andy Levy
Sent: Tuesday, November 07, 2000 7:34 PM
To: dakota-truck@buffnet.net
Subject: Re: DML: Re: V6ers-Running no muffler is indeed a bad thing
Someone slap me if I'm wrong (ah, hell, I need a good slapping anyway),
but don't you need backpressure to make torque? As well as a
not-unresticted intake (on a normally aspirated engine, that is)?
Back when I was in the Boy Scouts, one of our elder scouts showed us
that when you make a campfire, the harder you make the fire work to pull
oxygen in, the hotter it'll burn. *To a point* Make it work too hard,
and it won't be able to get enough oxygen to keep burning. Similar
situation with your engine & backpressure, etc.
I think?
Andy Wittkamper wrote:
>
> I don't understand why your loss of backpressure leaves you with less
> performance...if backpressure improves performance, your motor is not
tuned
> correctly-
>
> see this site- http://www.veltune.com/theory.htm
>
> Andy Wittkamper
> __________________________________
> http://www.members.tripod.com/TiptonFFA
> ----- Original Message -----
> From: "Mike Styer" <dakotamike@netzero.net>
> To: <dakota-truck@buffnet.net>
> Sent: Wednesday, November 08, 2000 12:43 AM
> Subject: DML: V6ers-Running no muffler is indeed a bad thing
>
> Well I should have known something like this was going to happen...
>
> After giving my Dak a tune up, having the tires changed, and even changing
> the
> timing belt without swearing ONCE, my streak is over. I ripped my exhaust
> apart
> this weekend getting firewood by driving over cable fenced that decided to
> jump
> uo and snatch my muffler. Tore pulled it apart at the ypipe-meets-main
pipe
> connection completely. Loudest a truck of mine has ever been.
>
> I got under there today and tried to put stuff together. The exhaust had
> also
> TORN out of the rubber hangers and twisted the one metal hanger so badly I
> had
> to try straighting it. No go, my little brother emptied every gas tank in
> the
> house. On top of all that, the y-pipe and main pipe were clamped so
tightly
> from the factory that they don't go back together.
>
> After an hour and a half of wrestling with and exhaust system that weighs
as
> much as I do I gave up, heated the room with every curse word I know, beat
> the
> crap out of the muffler with a ballpeen hammer, and finally cut the
muffler
> apart right in front of the muffler.
>
> I know I shouldn't have lost my temper, but I feel a lot better now and am
> in
> back in touch with the true me :) Besides this gives me an excuse to
> upgrade
> the exhaust.
>
> After cleaning up and cooling down, I took the Dak for a test run too find
> any
> performance difference. Soundwise, you can't tell the cat is even on,
it's
> just
> stinking loud. My parent heard me from 5 miles away in a hilly wooded
area.
> Powerwise, I did feel a gain from 2-4K, but trhere was a definite loss
from
> the
> get go.
>
> Tomorrow I am going to have the y-pipe welded to the main pipe, and I'll
get
> a
> clamp to strap type clamp to hold together what I cut off, just so I don't
> get
> pulled over. I'm thinking of ordering the Dynomax aftercat setup ($105 in
> Summit). Does anyone else have this? Is it truly bolt in or am I going
to
> get
> frustrated and cut something I shouldn't? Power vs. sound?
>
> Thanks for reading all the way through and allowing me to vent :) and
> thanks
> for any help as I now truly begin to "fix" my truck:)
>
> Mike S.
> 93 V6 5-speed CC Sport
> Perma-cool 16" electric fan, no muffler and earplugs
>
> ____________NetZero Free Internet Access and Email_________
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> ___________________________________________________________
-- -andyhttp://home.twcny.rr.com/andylevy/ --- andylevy@bigfoot.com ------------------------------------------------------------- "We like AMD. The enemy of our enemy is our friend." --- Jonathan Schwartz Sun senior vice president -------------------------------------------------------------
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