Chambered mufflers? Options

[dawnoforigin]

Is there any positive experience with these types of mufflers? I know most go with the straight through design, but I know they would be way too loud and not sound the way I would like. I also was considering this because I don't want to lose any low end power by getting a straight through design. Low end is much more important then high end to me. I was thinking about looking into a Dynomax Super Turbo or possibly a Flowmaster. Any input is appreciated.

http://www.dynomax.com/superturbo.stm

[soulshadow]

The design looks the same as a flowmaster. Im pretty sure it will be the same as a flowmaster 40 series and such.

[Bigmeanbulldog55]

If your leaving your cat and resinater, a strate through won't be loud at all. Mine wasn't when I got it. It is now though, because I've taken off those things.

[Boss-Celica]

Even though this is a little off topic I was wondering how it would sound if I removed my resignator and put a hig flow cat? I am thinking of doing that.

[nowitzon]

LOUD!!!! Leave the resonator on u will lose some backpressure too i speak from experience

This post has been edited by nowitzon: Oct 17, 2005 - 7:18 PM

[Galcobar]

Cars do not need backpressure -- it's a myth.

Big pipes have lower initial backpressure, but quickly create turbulence (a form of backpressure) because they let the gas expand, cool and slow down. Exhaust therefore cannot exit the engine as quickly and efficiently, and energy that should be going to turning the crank is instead being used to push exhaust gases out.

Backpressure is an inevitable consequence of not having a variable exhaust size. The harder the engine is working, the more exhaust it needs to get rid of, and the ideal situation would be for the exhaust pipes to grow as the engine pumps out more fumes.

Since we don't have that technology, what we do is pick a compromise size. It's not as efficient at low revs as a small pipe, because the exhaust gases have room to expand, cool and slowdown, reducing the scavenging effect and forcing the engine to expend energy on moving what is now heavier gas. At high revs it's not as efficient as a larger pipe, because the gas bottlenecks. Either way, you get backpressure. The compromise aims to minimize that backpressure over the band, and preferably have the most efficient exhaust extraction (high velocity, lowest backpressure) at the RPM point where the engine spends the most time.

Really big pipes are good only if you're producing enough exhaust to be efficiently using them. This is where FI and NO2 come in, since they effectively simulate greater displacement and therefore a bigger engine.

--------------------------------------
Boss-celica, given you have a 5SFE, unless you've replaced your stock manifold with a header, your cat is still attached to the bottom of the manifold. Besides which, the term "high-flow" for cats doesn't really apply except between modern three way converters and older styles. The Celica comes with a TWC.

If you have a header and are running without a cat, my best suggestion would be to pick up a cat with a resonated core. That way, when you install it in place of the stock resonator, you retain most of your sound suppression and keep your emissions clean.

Straight-through mufflers are louder than chambered or baffled mufflers. However, their design allows you to use a longer muffler without particularly affecting exhaust flow, while significantly reducing noise. Just don't mistake an old-technology glass pack such as a Cherry Bomb with a modern straight-through muffler. And don't mistake a resonator for a glasspack or straight-through muffler. Resonators bounce soundwaves off each other to cancel out noise, glasspacks/straight-through mufflers use insulation to absorb noise. Entirely different technologies. Resonators get rid of buzz better than absorptive pieces, BTW.-

[Valo666]

that muffler is soooooooo bloody loud. i had it on my mkIII supra. I didnt have a res in it and it was rediculusly loud.

This post has been edited by Valo666: Oct 17, 2005 - 8:26 PM

[Bigmeanbulldog55]

If cars don't need backpressure, then how come some run like crap, or don't even run without back pressure?

[playr158]

na motors need a certain amount.....
boosted doesn't

but dynomax superturbo i had with no resonator and it was reasonably loud if you leave your resonator in it will be unhearable
the same with a straight through....and with just a straight through muffler your not goin to lose any low end
personally get a decent straight through design muffler and keep your resonator

[soulshadow]

Just get a 2.25 catback. It increased a lot of HP or sounds like it. Anways major difference. I got no res too, and my car sounds very nice deep thoooart type with a buzzing noise when its cold started. When it warms up, the buzzing noise only kiks in when my vvt activates. Actually its more of a whoosh sound.

[playr158]

It increased a lot of HP or sounds like it

PLEASE never say sumthing like this again...thank you

noise does not = power........

from a FULL downpipe back exhaust your probably looking at 10hp or so

and since when did any usdm celica get vvt in a 6th gen?

[Bigmeanbulldog55]

Noise could equal hp, if you hear the noise rising faster. And you can hear if an engine is running better. I got your back shadow.

[playr158]

no noise does not equal horsepower.....
my bov makes noise do i get more hp?
a big fart can on my car that doesn't really make horse power....
if i slap a short ram intake that does not really make power

[95CelicaST]

You can slap on a couple sweet stickers brah and get 50HP!

Please.. there is little one can do to increase HP on our engines w/o something huge. The best way I guess for those on a budget is to do CAI(if applicable) and cat-back. If you can get your hands on a set of headers you might want to do that.. but good luck.

[Bigmeanbulldog55]

no noise does not equal horsepower.....
my bov makes noise do i get more hp?
a big fart can on my car that doesn't really make horse power....
if i slap a short ram intake that does not really make power
[right][snapback]345945[/snapback][/right]

I'm just giving you a hard time. I don't know why though. Honestly, you can hear a car and by the noise tell how it's running. But, anyone would agree, just because it's louder doesn't mean it's faster.

You can slap on a couple sweet stickers brah and get 50HP!

Please.. there is little one can do to increase HP on our engines w/o something huge. The best way I guess for those on a budget is to do CAI(if applicable) and cat-back. If you can get your hands on a set of headers you might want to do that.. but good luck.
[right][snapback]345998[/snapback][/right]

Always debated, the potential of a "fe" engines. It's not good, but saying that adding CAI, exhaust, and only one header, could give you a car to play with. This combined with suspension mods would make a fun driving, possabably nice autox, car.

[95CelicaST]

Always debated, the potential of a "fe" engines. It's not good, but saying that adding CAI, exhaust, and only one header, could give you a car to play with. This combined with suspension mods would make a fun driving, possabably nice autox, car.

as opposed to adding TWO headers?

[soulshadow]

Noise could equal hp, if you hear the noise rising faster.  And you can hear if an engine is running better.  I got your back shadow.
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Yes that's right man! Some cars do sound very loud and they also have very nasty muscle engines. The better the sound the better the engine, but if all it was was some muffler that was meant to sound loud and shake the car's interior than its just a loud muffler and nothing at all.

Something huge to increase HP-------> Swapped my 7afe engine for a 4age 20V ST and YES THIS DOES HAVE VVT AND ITS IN A USDM 6GEN!! (its just not factory stock)

[nowitzon]

ok all i know is that the car is pulling harder now that i have my resonator back on geez...

[Bigmeanbulldog55]

You can slap on a couple sweet stickers brah and get 50HP!

Please.. there is little one can do to increase HP on our engines w/o something huge. The best way I guess for those on a budget is to do CAI(if applicable) and cat-back. If you can get your hands on a set of headers you might want to do that.. but good luck.
[right][snapback]345998[/snapback][/right]

Always debated, the potential of a "fe" engines. It's not good, but saying that adding CAI, exhaust, and only one header, could give you a car to play with. This combined with suspension mods would make a fun driving, possabably nice autox, car.

as opposed to adding TWO headers?
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I was trying to poke a joke at your first statement.

[95CelicaST]

trying...