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exhaust taken off sunds mad #146550 Apr 6, 1:50am Apr 6, 1:50am
Joined: Nov 2003
Posts: 88
Australia
driver OP
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2001 Toyota Celica SX
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Australia
exhaust taken off sunds mad
but is it okay for the car or does it damage it

Re: exhaust taken off sunds mad [Re: driver] #146551 Apr 6, 4:45am Apr 6, 4:45am
Joined: Aug 2003
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New Orleans, LA
Speed4TheNeed
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taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.

Re: exhaust taken off sunds mad [Re: driver] #146552 Apr 6, 4:49am Apr 6, 4:49am
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Lafayette, LA
DiabloGTS
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how is a decrease in back pressure an increase in Performance? confused


To have played and laughed with enthusiasm
and sung with exultation
To know even one life has breathed easier
This is to have succeeded.
Re: exhaust taken off sunds mad [Re: DiabloGTS] #146553 Apr 6, 5:00am Apr 6, 5:00am
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Posts: 500
Salisbury, MD
2002 Spectra Blue Mica Toyota Celica GTS
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Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused


Yeah I thought that if you loose backpressure you will loose Performance.


I'm gonna take your little Civic. Dust it off. Turn it sideways and stick it straight up you candy A*s.
Re: exhaust taken off sunds mad [Re: DiabloGTS] #146554 Apr 6, 5:01am Apr 6, 5:01am
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New Orleans, LA
Speed4TheNeed
Caleb
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Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused


because it allows your engine to perform better.

as you know, air tends to 'stick' to surfaces--any surface. with an exhaust, air must be 'pushed' out of it and your engine has to work to do that.

without an exhaust, your engine just 'throws' it's emissions out without having to work as hard as pushing it out through a piping.

thats why aftermarket perforamance exhausts have a wider diameter--so air has less friction as it travels along the length of the piping thumbsup

Re: exhaust taken off sunds mad [Re: GTSHYPR] #146555 Apr 6, 5:02am Apr 6, 5:02am
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Speed4TheNeed
Caleb
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Originally Posted by GTSHYPR
Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused


Yeah I thought that if you loose backpressure you will loose Performance.


nope. you will lose some initial torque though.

some backpressure is good for torque, however..in the higher rpms your torque will be made up and your whp will incease, also. thumbsup

Re: exhaust taken off sunds mad [Re: Speed4TheNeed] #146556 Apr 6, 5:05am Apr 6, 5:05am
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New Orleans, LA
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in all aftermarket Performance exhausts & headers, initial torque will be DECREASED, this is because backpressure is reduced therefore your lower rpm torque decreases. (in an Intake your initial torque also decreases).

however, the gains on the top-end are considerred more than worth it because you gain more at the top than you lose at the bottom. that's why theres a market for aftermarket bolt-ons. thumbsup

Re: exhaust taken off sunds mad [Re: driver] #146557 Apr 6, 5:09am Apr 6, 5:09am
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Salisbury, MD
2002 Spectra Blue Mica Toyota Celica GTS
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Well I guess ya learn something new everyday.


I'm gonna take your little Civic. Dust it off. Turn it sideways and stick it straight up you candy A*s.
Re: exhaust taken off sunds mad [Re: GTSHYPR] #146558 Apr 6, 5:12am Apr 6, 5:12am
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New Orleans, LA
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Originally Posted by GTSHYPR
Well I guess ya learn something new everyday.


thumbsup thats what i'm here for--to learn and to hopefully help some other people learn as well.

Re: exhaust taken off sunds mad [Re: GTSHYPR] #146559 Apr 6, 5:59am Apr 6, 5:59am
Joined: Oct 2003
Posts: 214
Denmark
marajade
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Originally Posted by GTSHYPR
Well I guess ya learn something new everyday.


Me too... well not in great detail - but something grin


1988 Toyota Celica 2.0 GTi-16 and 2000 Toyota Celica VVT-i
Re: exhaust taken off sunds mad [Re: Speed4TheNeed] #146560 Apr 6, 8:26am Apr 6, 8:26am
Joined: Sep 2003
Posts: 3,077
Saint Louis, MO
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Originally Posted by sPeEd4tHeNeEd

taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.

Re: exhaust taken off sunds mad [Re: slidr] #146561 Apr 6, 8:40am Apr 6, 8:40am
Joined: Aug 2003
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Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.


exhaust is an accumulative term, or it can mean just the rear piping.

the actual 'exhaust' includes everything from your engine to your tailpipe.

a lot of time we use the term exhaust just to mean the part from the header/downpipe to the tailpipe.

Re: exhaust taken off sunds mad [Re: Speed4TheNeed] #146562 Apr 6, 11:06am Apr 6, 11:06am
Joined: Jan 2004
Posts: 1,248
Idaho Falls, ID
Rocketman
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Most people don't know that exhausts come of the header. They are made of pipe. Usually metal pipe. Sometimes there will be catalytic converters in the pipe to help with the exhaust smell. It can be really smelly without a Catalytic converter!! Sometimes Exhausts have resonators on them. This can make things resonate. I am not exactly sure what...but you get the idea.

Just my 2 bits!!!












BUAWAAHAHAHAHAHAHAHAHAHAAHH!!

Re: exhaust taken off sunds mad [Re: Rocketman] #146563 Apr 6, 3:04pm Apr 6, 3:04pm
Joined: Sep 2003
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Saint Louis, MO
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Originally Posted by Rocketman
Most people don't know that exhausts come of the header. They are made of pipe. Usually metal pipe. Sometimes there will be catalytic converters in the pipe to help with the exhaust smell. It can be really smelly without a Catalytic converter!! Sometimes Exhausts have resonators on them. This can make things resonate. I am not exactly sure what...but you get the idea.

Just my 2 bits!!!












BUAWAAHAHAHAHAHAHAHAHAHAAHH!!
I think the resonator reduces the sound of the exhaust.


Aqua Teen Hunger Force...number one in the hood, G
Re: exhaust taken off sunds mad [Re: Speed4TheNeed] #146564 Apr 6, 3:06pm Apr 6, 3:06pm
Joined: Sep 2003
Posts: 3,077
Saint Louis, MO
slidr
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Originally Posted by sPeEd4tHeNeEd
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.


exhaust is an accumulative term, or it can mean just the rear piping.

the actual 'exhaust' includes everything from your engine to your tailpipe.

a lot of time we use the term exhaust just to mean the part from the header/downpipe to the tailpipe.
That's why it matters where you remove it at. Taking it off from the rear axle on back will help Performance a little, but would just be too noisy.

Taking it off before the cat and from the header could cause some problems.

It all depends on where he takes it off at. He wasn't really too specific about it.


Aqua Teen Hunger Force...number one in the hood, G
Re: exhaust taken off sunds mad [Re: driver] #146565 Apr 6, 3:28pm Apr 6, 3:28pm
Joined: Jul 2002
Posts: 10,123
Milford, NJ
VSGTS14
05 WRB
2005 Subaru WRX STi
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that's how nascar's run...


we had a tundra getting headers installed on it and the mechanic just had open headers on..no exhaust...



you do not want to know how loud it was...omg, it was awesome.


SUBARU TECNICA INTERNATIONAL
Re: exhaust taken off sunds mad [Re: slidr] #146566 Apr 6, 6:37pm Apr 6, 6:37pm
Joined: Jan 2004
Posts: 1,248
Idaho Falls, ID
Rocketman
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Originally Posted by slidr
Originally Posted by Rocketman
Most people don't know that exhausts come of the header. They are made of pipe. Usually metal pipe. Sometimes there will be catalytic converters in the pipe to help with the exhaust smell. It can be really smelly without a Catalytic converter!! Sometimes Exhausts have resonators on them. This can make things resonate. I am not exactly sure what...but you get the idea.

Just my 2 bits!!!












BUAWAAHAHAHAHAHAHAHAHAHAAHH!!
I think the resonator reduces the sound of the exhaust.


I KNOW!!! It was a joke...gone bad...

Re: exhaust taken off sunds mad [Re: DiabloGTS] #146567 Apr 6, 6:56pm Apr 6, 6:56pm
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Originally Posted by DiabloGTS
how is a decrease in back pressure an increase in Performance? confused


wtf You'll lost low end but it'll more than make up for it in top end

Re: exhaust taken off sunds mad [Re: driver] #146568 Apr 6, 7:01pm Apr 6, 7:01pm
Joined: Aug 2003
Posts: 2,269
Seattle, WA
NorwayGT
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2004 Dodge SRT4
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lmao. i took off my axle back and listend to it for a while, then i installed kazuma, and let me tell you...kazuma is LOUDER


was....5speed with i/h/e
15.41 @ 89.30mph 2.282 60'

is....04 srt4 stock
13.936 100.15mph 2.177 60'
Re: exhaust taken off sunds mad [Re: slidr] #146569 Apr 6, 7:26pm Apr 6, 7:26pm
Joined: Jan 2004
Posts: 1,612
St.George, UT
eric_h
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St.George, UT
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
Originally Posted by slidr
Originally Posted by sPeEd4tHeNeEd
taking off your exhaust won't hurt your car one bit.

it'll actually increase Performance (reduces backpressure greatly, obviously) which is good

but it'll blow emissions like a mother, which is bad. and obviously it's illegal because of this.
This will not affect your emissions one bit if you remove the exhaust after the cat, and that's not why it's illegal. It's illegal due to the annoying loud sound that it would produce.

Also, reducing back pressure isn't always good. Reducing it some can prove to be beneficial to Performance, but reducing it too much is just asking for problems.

Back pressure is there for a reason. It's not a mistake that it's there.

When too little back pressure is present then some of the fresh air entering the engine leaves with the exhaust before the exhaust valve closes. So when the engine isn't getting enough air then the computer compensates by decreasing the fuel too.

Therefore, less power.


Back pressure is essential for allowing the correct amount of air to enter and exit the engine when it's supposed to, and on the correct stroke. You don't want Intake air exiting on the exhaust stroke.


exhaust is an accumulative term, or it can mean just the rear piping.

the actual 'exhaust' includes everything from your engine to your tailpipe.

a lot of time we use the term exhaust just to mean the part from the header/downpipe to the tailpipe.
That's why it matters where you remove it at. Taking it off from the rear axle on back will help Performance a little, but would just be too noisy.

Taking it off before the cat and from the header could cause some problems.

It all depends on where he takes it off at. He wasn't really too specific about it.


i believe at a certain point in reducing backpressure the top end will not make up for the low end, but what the hay every engines different


[Linked Image]
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Re: exhaust taken off sunds mad [Re: driver] #146570 Apr 7, 6:48am Apr 7, 6:48am
Joined: Oct 2003
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There is a lot of half-right information in this thread. "Backpressure" by itself does not add torque - a smooth pattern of exhaust gas pulses leaving the engine pulling each other along adds torque. Unbolting your stock axleback section can lose some torque because it shortens the length of exhaust pipe that those pulses travel down. If you look at the TRD exhaust, which actually GAINS low end torque, the path the piping takes makes it longer than stock, so with a free flowing muffler it adds power and torque. Another reason some aftermarket exhausts lose low end is they use larger than stock piping, again allowing those exhaust pulses to slow down (picture water going through a bigger or smaller pipe) also losing low end torque. If you made a straight mandrel bent pipe from the cat back, following the same path as the TRD piping, with the same diameter piping as stock you would have much less backpressure, but you would gain horsepower AND torque (and a hell of a lot of noise!)

Re: exhaust taken off sunds mad [Re: driver] #146571 Apr 7, 10:08am Apr 7, 10:08am

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^^ thank you for summarizing this thing...!! spineyes

Re: exhaust taken off sunds mad #146572 Apr 9, 2:09am Apr 9, 2:09am
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I learned a thing or two today. thumbsup


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